The mortgage interest deduction allows homeowners to reduce their taxable income by deducting the interest they pay on qualified home loans. Under Internal Revenue Code Section 163(h)(3), homeowners may subtract mortgage interest from their income when filing federal tax returns, but only if they itemize deductions on Schedule A of Form 1040 instead of taking the standard deduction.
The specific problem this deduction addresses stems from IRC Section 163(h)(3)(F), which limits the deduction to acquisition indebtedness of $750,000 ($375,000 for married filing separately) for mortgages originated after December 15, 2017. This limitation creates a complex tax situation because homeowners must calculate whether itemizing provides greater tax savings than claiming the standard deduction, and those with mortgage debt exceeding the threshold face additional mathematical calculations to determine their deductible amount. The immediate negative consequence of exceeding these limits means homeowners lose the tax benefit on interest paid above the cap, effectively increasing their after-tax cost of homeownership.
Here’s a striking statistic: Only 8% of U.S. households benefit from the mortgage interest deduction as of 2024, and approximately 75% of the federal revenue lost to this tax break—an estimated $34 billion annually—goes to households earning over $200,000 per year.
What you’ll learn in this guide:
📌 How federal law establishes your deduction limits – Understanding IRC Section 163(h)(3) rules, the $750,000 debt cap, and how grandfathered mortgages from before December 15, 2017 still qualify under the old $1 million limit
🏠 Which types of homes and loans qualify – Discovering which properties count as qualified residences, including primary homes, second homes, cooperative housing shares, and homes under construction
💰 How to calculate your actual deduction amount – Learning the step-by-step math when your mortgage exceeds limits, how to prorate interest between personal and business use, and what happens with refinancing
📋 What forms you need and common filing mistakes – Mastering Form 1098, Schedule A, and Form 8829 requirements while avoiding errors that trigger IRS audits or lost deductions
🎯 Which scenarios maximize your tax savings – Understanding when itemizing beats the standard deduction, how the SALT cap affects your total benefit, and why mortgage insurance premiums return as deductible in 2026
Federal Law Governing Mortgage Interest Deductions
The Internal Revenue Code Foundation
The legal authority for deducting mortgage interest originates from Internal Revenue Code Section 163(a), which states: “There shall be allowed as a deduction all interest paid or accrued within the taxable year on indebtedness.” However, this broad permission contains critical limitations for homeowners.
Section 163(h) specifically restricts personal interest deductions, creating an exception only for qualified residence interest. This means you cannot deduct interest on personal loans, credit cards, or car loans, but you can deduct interest on mortgages that meet specific criteria because Congress carved out this special treatment to encourage homeownership.
Defining Qualified Residence Interest
Qualified residence interest consists of two components under IRC Section 163(h)(3)(A): interest paid on acquisition indebtedness and interest paid on home equity indebtedness.
Acquisition indebtedness means debt incurred to buy, build, or substantially improve a qualified residence. The debt must be secured by that residence, meaning the lender holds a mortgage lien against your property. For example, if you borrow $500,000 to purchase your first home and the bank places a mortgage on that property, the interest you pay qualifies as acquisition interest.
Home equity indebtedness historically allowed deductions for loans taken against your home’s value for any purpose, but the Tax Cuts and Jobs Act (TCJA) changed this. Beginning with tax year 2018 through 2025, home equity loan interest became deductible only if you used the borrowed funds to buy, build, or substantially improve the home securing the loan. The One Big Beautiful Bill Act made this restriction permanent in 2025.
This creates a crucial distinction: If you take out a $50,000 home equity line of credit (HELOC) to remodel your kitchen, the interest qualifies for deduction. If you use that same HELOC to pay off credit card debt or buy a car, the interest does not qualify, even though both loans are secured by your home. The IRS requires you to trace how you spent the proceeds, and documentation becomes essential during an audit.
The Debt Limitation Rules
The amount of mortgage debt eligible for interest deduction has changed significantly over time. Understanding these limits determines how much interest you can actually deduct.
For mortgages originated on or before December 15, 2017: You can deduct interest on up to $1 million of acquisition debt ($500,000 if married filing separately). These mortgages are “grandfathered” under the old rules. Additionally, you could deduct interest on up to $100,000 of home equity debt ($50,000 if married filing separately) regardless of how you used the funds, though this home equity benefit expired for tax years 2018-2025.
For mortgages originated after December 15, 2017: The deduction limit dropped to $750,000 of acquisition debt ($375,000 if married filing separately). The One Big Beautiful Bill Act made this lower limit permanent, so it will not sunset or revert to $1 million. Home equity debt interest remains deductible only when used for qualified home improvements, subject to the overall $750,000 acquisition debt cap.
This date-of-origination rule creates complexity when refinancing. If you refinance a grandfathered mortgage, you can maintain the $1 million limit only if the refinanced amount does not exceed your remaining balance on the original mortgage and does not extend beyond the original loan term. Taking cash out or extending the term causes you to lose grandfathered status for the excess amount.
Example: Maria bought her home in 2015 with a $900,000 mortgage. By 2024, she still owes $850,000. If she refinances for exactly $850,000 without extending the original term, her interest remains deductible under the $1 million grandfathered limit. If she refinances for $900,000 to take $50,000 cash out for a vacation, she loses grandfathered status on the additional $50,000, which then counts against the new $750,000 limit and the cash-out interest is not deductible because it wasn’t used for home improvements.
What Qualifies as a Residence
The mortgage must be secured by a qualified home to generate deductible interest. IRC Section 163(h)(4)(A) defines this as your main home or a second home.
A home includes a house, condominium, cooperative apartment, mobile home, house trailer, boat, or similar property containing sleeping, cooking, and toilet facilities. The property must serve as your residence, not merely as an investment.
Your main home is where you ordinarily live most of the time. You can have only one main home at any given time, though you can change which property is your main home.
Your second home must meet additional requirements if you rent it out during the year. You must personally use the second home for more than 14 days OR more than 10% of the days you rent it at fair market value, whichever is longer. If you rent the property for more than 14 days but don’t meet the personal use threshold, the IRS treats it as rental property rather than a second home, and different tax rules apply.
Example: David owns a beach house that he rents for 120 days during the summer. To qualify the property as a second home for the mortgage interest deduction, he must use it personally for more than 14 days (the greater of 14 days or 12 days, which is 10% of 120 rental days). If David only uses the beach house for 10 days, it becomes rental property, and he must allocate expenses between rental and personal use on Schedule E instead of claiming the full mortgage interest on Schedule A.
You can designate only one second home per year for the mortgage interest deduction. If you own three vacation properties, you must choose which one to treat as your second home, and mortgage interest on the other properties receives no deduction.
The Tax Cuts and Jobs Act Changes
Historical Context: Pre-2018 Rules
Before the Tax Cuts and Jobs Act took effect on January 1, 2018, homeowners enjoyed more generous deduction limits. The law allowed interest deductions on up to $1 million of acquisition debt and an additional $100,000 of home equity debt, regardless of how borrowers spent home equity proceeds.
The standard deduction was also much lower: $6,350 for single filers and $12,700 for married couples filing jointly in 2017. This meant more taxpayers found itemizing advantageous because their mortgage interest alone often exceeded the standard deduction.
The 2017 Reform and Its Impact
The Tax Cuts and Jobs Act fundamentally changed the mortgage interest deduction landscape through three major provisions.
First, the law reduced the acquisition debt limit from $1 million to $750,000 for mortgages originated after December 15, 2017. Married couples filing separately saw their limit drop from $500,000 to $375,000.
Second, the TCJA eliminated the deduction for home equity loan interest unless borrowers used the proceeds to buy, build, or substantially improve their qualified residence. The previous $100,000 home equity allowance disappeared entirely.
Third, and perhaps most significantly, the law nearly doubled the standard deduction to $12,000 for single filers and $24,000 for married couples filing jointly. This increase meant fewer taxpayers benefited from itemizing because their total itemized deductions (mortgage interest plus property taxes plus charitable contributions) no longer exceeded the higher standard deduction.
The result was dramatic. The percentage of tax returns claiming itemized deductions plummeted from 30.9% in 2017 to just 9.6% in 2021. Among those still itemizing in 2021, approximately 11.5 million taxpayers (76.6% of all itemizers) claimed the mortgage interest deduction, deducting a total of $143.5 billion.
The One Big Beautiful Bill Act of 2025
Originally, the TCJA’s mortgage interest provisions were scheduled to sunset after 2025, potentially reverting to the pre-2017 rules. This created uncertainty for homeowners and the housing market.
In 2025, Congress passed the One Big Beautiful Bill Act, which made the $750,000 acquisition debt limit permanent. There is no longer an expiration date or possibility of automatic reversion to the $1 million threshold.
The 2025 Act also permanently reinstated the treatment of mortgage insurance premiums as qualified mortgage interest, effective for tax year 2026. Homeowners who pay private mortgage insurance (PMI) on conventional loans or mortgage insurance premiums (MIP) on FHA loans can now deduct these amounts, subject to income limitations and the overall mortgage interest deduction cap.
This reinstatement benefits homeowners who made down payments of less than 20% and must pay mortgage insurance. The average PMI deduction claimed when it was previously available was approximately $1,454 per year.
Types of Qualified Homes and Special Situations
Primary Residence Requirements
Your primary residence is the home where you live most of the time. The IRS looks at several factors to determine which property qualifies as your main home when you own multiple properties: where you work, where your family lives, where you bank, where you register to vote, and the address you use for tax returns and driver’s license.
You can deduct mortgage interest on only one primary residence at a time, though you can change which property serves as your primary residence. The property must have sleeping, cooking, and toilet facilities to qualify.
If you use part of your primary residence for business purposes, special allocation rules apply. You cannot claim the full mortgage interest as a personal deduction if you also claim a home office deduction.
Second Home Rules and Limitations
The second home category creates significant complexity because the rules differ depending on whether you rent the property.
Second home not rented: If you never rent out your second home during the year, you can treat it as a qualified residence without any personal use requirement. You don’t even need to stay in it during the year. The mortgage interest qualifies for deduction as long as your combined mortgage debt on both homes doesn’t exceed the applicable limits ($750,000 or $1 million, depending on origination date).
Second home rented 14 days or less: This situation triggers the “Augusta Rule” named after homeowners in Augusta, Georgia, who rent their properties during the Masters golf tournament. If you rent your second home for 14 days or fewer during the year, you don’t report the rental income at all, and you claim the full mortgage interest as a personal deduction on Schedule A. The IRS essentially ignores the rental activity.
Second home rented more than 14 days: Once you rent your second home for more than 14 days, you must report all rental income. You then face a personal use test: Did you use the property personally for more than 14 days OR more than 10% of the rental days, whichever is greater?
If you meet this personal use threshold, the property remains a second home. You deduct mortgage interest on Schedule A, and you also report rental income and allocate expenses on Schedule E based on the percentage of rental days.
If you fail this personal use threshold, the property becomes rental property. Mortgage interest is 100% deductible as a rental expense on Schedule E with no dollar limitations, but you cannot claim it as a qualified residence under the mortgage interest deduction rules. This might actually be advantageous because rental property mortgage interest has no debt cap, while personal residence interest is limited to $750,000 of debt.
| Rental Scenario | Tax Treatment |
|---|---|
| Rent for 10 days, use personally for 30 days | Second home; full mortgage interest on Schedule A; no rental income reported |
| Rent for 100 days, use personally for 30 days | Second home; mortgage interest on Schedule A; rental income/expenses allocated between personal (23%) and rental (77%) use on Schedule E |
| Rent for 100 days, use personally for 8 days | Rental property; 100% mortgage interest deductible on Schedule E with no cap; no Schedule A deduction |
Cooperative Housing Corporations
Tenant-stockholders in cooperative housing corporations receive special treatment under IRC Section 216. Unlike owning a condominium where you hold title to real property, owning a cooperative means you own shares in a corporation coupled with a lease giving you the right to occupy a specific unit.
To qualify for the mortgage interest deduction, the cooperative housing corporation must meet several requirements:
- At least 80% of the corporation’s gross income must come from tenant-stockholders
- At least 80% of the total square footage must be used or available for residential purposes by tenant-stockholders
- The corporation must not be a tax-exempt organization
- The shares must be held by a tenant-stockholder entitled to occupy a unit
When these requirements are met, tenant-stockholders can deduct their proportionate share of the cooperative corporation’s deductible mortgage interest and real estate taxes. The cooperative provides each tenant-stockholder with an annual statement (usually by January 31) showing their allocable share.
Example: The Manhattan Heights Cooperative has a $5 million mortgage on its building. The cooperative pays $300,000 in mortgage interest during the year. Sarah owns shares representing 2% of the cooperative. The cooperative notifies Sarah that her allocable share of mortgage interest is $6,000 (2% of $300,000). Sarah can deduct this $6,000 on Schedule A, subject to the overall mortgage interest limitations.
The debt limit for cooperatives applies differently than for single-family homes. The limit applies to the cooperative corporation’s total mortgage debt, not to the individual tenant-stockholder’s share. However, each tenant-stockholder can only deduct their proportionate share of interest on up to $750,000 of the cooperative’s total qualifying debt.
Homes Under Construction
You can treat a home under construction as a qualified residence for up to 24 months, but only if the home becomes your qualified residence once construction is complete. The 24-month period can start any time on or after the day construction begins.
This provision allows you to deduct construction loan interest during the building phase, which otherwise might not qualify because the property lacks sleeping, cooking, and toilet facilities during construction.
Example: Tom begins building his dream home on March 1, 2024. Construction takes 18 months and finishes on September 1, 2025. Tom moves in on September 15, 2025, making it his primary residence. The construction loan interest from March 2024 through September 2025 qualifies for deduction, even though the property wasn’t habitable during most of that period.
If construction takes longer than 24 months, interest paid after the 24-month period does not qualify until you actually occupy the home as your residence.
Mobile Homes, Boats, and Unusual Residences
The tax code defines “home” broadly enough to include mobile homes, house trailers, and even boats, as long as the property contains sleeping, cooking, and toilet facilities.
This means if you live aboard a yacht that has a bedroom, kitchen, and bathroom, and you secure a loan using that boat as collateral, the interest may qualify for the mortgage interest deduction. The same applies to recreational vehicles (RVs) that meet the facility requirements.
The key requirement remains that the loan must be secured by the property. A personal loan to buy a boat, even if you live on that boat, does not generate deductible mortgage interest because no security interest exists.
Calculating Your Deductible Mortgage Interest
When Your Mortgage Stays Under the Limit
If your average mortgage balance during the year stays at or below $750,000 (or $1 million for grandfathered loans), and you used the full amount to buy, build, or improve your qualified residence, calculating your deduction is straightforward.
You simply add up all the mortgage interest you paid during the tax year. Your mortgage lender will send you Form 1098, Mortgage Interest Statement, by January 31 showing the total interest reported in Box 1. You transfer this amount directly to Schedule A, Line 8a of your Form 1040.
Example: Jennifer has a $600,000 mortgage that she used to buy her primary residence in 2020. Her Form 1098 shows she paid $24,000 in mortgage interest during 2025. Because her mortgage is under the $750,000 limit, she can deduct the full $24,000 on Schedule A.
Calculating the Limitation When You Exceed the Cap
When your average mortgage balance exceeds $750,000 (or $1 million for grandfathered loans), you must calculate what percentage of your interest qualifies for deduction.
The formula works as follows:
- Calculate your average mortgage balance for the year
- Divide the applicable limit ($750,000 or $1 million) by your average balance
- Multiply the result by your total interest paid
Example: Marcus bought his home in 2022 with a mortgage of $950,000. His mortgage balance at the start of 2025 was $920,000, and at the end of 2025 it was $910,000. His average balance is $915,000. He paid $55,000 in interest during 2025.
Calculation:
- Average balance: $915,000
- Applicable limit: $750,000 (post-2017 mortgage)
- Limitation percentage: $750,000 ÷ $915,000 = 0.8197 (81.97%)
- Deductible interest: $55,000 × 0.8197 = $45,083
Marcus can deduct $45,083 on Schedule A. The remaining $9,917 of interest he paid generates no tax benefit.
IRS Publication 936 contains a detailed worksheet (Table 1) that guides you through this calculation, accounting for multiple mortgages, grandfathered debt, and new debt.
Multiple Mortgages and Combined Limits
If you have mortgages on both your primary residence and a second home, the $750,000 limit applies to the combined debt on both properties.
Example: Patricia has a $600,000 mortgage on her primary residence and a $400,000 mortgage on her vacation condo, for a total of $1 million in mortgage debt. Her combined debt exceeds the $750,000 limit by $250,000.
She paid $30,000 interest on her primary residence and $20,000 on her vacation home, for a total of $50,000 in interest.
Calculation:
- Combined debt: $1,000,000
- Applicable limit: $750,000
- Limitation percentage: $750,000 ÷ $1,000,000 = 0.75 (75%)
- Deductible interest: $50,000 × 0.75 = $37,500
Patricia can deduct $37,500 total. The limitation applies proportionally to both mortgages.
Refinancing Scenarios
Refinancing creates several distinct scenarios depending on whether you take cash out and what you use the cash for.
Rate-and-term refinance (no cash out): If you refinance solely to get a better interest rate or different loan term without taking additional money, the interest continues to qualify as acquisition indebtedness. The deduction continues as before, subject to the same limits.
Cash-out refinance for home improvements: If you refinance and take cash out, but use the additional funds to buy, build, or substantially improve your qualified residence, all the interest qualifies as acquisition interest. The debt must remain within the $750,000 overall limit.
Example: Kevin owes $200,000 on his original mortgage. He refinances for $250,000, taking $50,000 cash to remodel his kitchen. The full $250,000 counts as acquisition debt because he used the cash-out portion for substantial home improvements. All interest is deductible (assuming his total doesn’t exceed $750,000).
Cash-out refinance for other purposes: If you take cash out and use it for anything other than home improvements—such as paying off credit cards, buying a car, or funding college tuition—you can only deduct interest on the portion equal to your original loan balance.
Example: Kevin owes $200,000 on his original mortgage. He refinances for $250,000, taking $50,000 cash to pay off credit cards. Only the interest attributable to $200,000 is deductible. The interest on the $50,000 cash-out portion is not deductible.
The IRS requires you to trace the use of funds. Keep documentation showing how you spent cash-out proceeds, especially closing statements, contractor invoices, and canceled checks.
Points and Loan Origination Fees
Mortgage points (also called loan origination fees or discount points) are prepaid interest. One point equals 1% of the loan amount. Borrowers pay points at closing to reduce their interest rate over the life of the loan.
Points on a purchase mortgage: If you pay points when buying your main home, you can generally deduct the full amount in the year you pay them if all these conditions are met:
- The loan is secured by your main home
- Paying points is an established business practice in your area
- The points don’t exceed the amount generally charged in your area
- You use the cash method of accounting (most individuals do)
- The points weren’t paid in place of amounts that are normally stated separately (like appraisal fees or title insurance)
- You paid the points with your own funds—not borrowed from the lender
- You paid at least as much as the points charged (including your down payment and other funds)
- You use the loan to buy or build your main home
Example: Monica buys her first home for $400,000 with a $320,000 mortgage. She makes a $80,000 down payment and pays $6,400 in points (2% of the loan) at closing with her own funds. Points are customary in her area. Monica can deduct the full $6,400 in points in the year she buys the home.
Points on a refinance: When you refinance, you generally cannot deduct all the points in the year you pay them. Instead, you must amortize (spread out) the deduction over the life of the new loan.
Example: Marcus refinances his mortgage to a new 30-year loan and pays $3,000 in points. He must deduct $100 per year ($3,000 ÷ 30 years) over the 30-year period.
However, if you refinance again or pay off the loan early, you can deduct all remaining unamortized points in the year you pay off the old loan. If you refinance with the same lender, the remaining points from the old loan continue to amortize over the new loan term.
Mortgage Insurance Premiums (Effective 2026)
Beginning with tax year 2026, mortgage insurance premiums paid on qualified mortgage insurance contracts will be deductible as mortgage interest. This applies to private mortgage insurance (PMI) on conventional loans, mortgage insurance premiums (MIP) on FHA loans, and funding fees on VA loans.
To qualify for the deduction, all of the following must be true:
- The insurance contract must have been issued after December 31, 2006
- The mortgage must be acquisition debt for a qualified residence
- You must itemize deductions on Schedule A
- Your modified adjusted gross income (MAGI) must be below certain thresholds
Income limitations: The mortgage insurance premium deduction begins to phase out when your MAGI exceeds $100,000 ($50,000 if married filing separately). The deduction reduces by 10% for each $1,000 of income above the threshold and is completely eliminated when MAGI reaches $109,000 ($54,500 if married filing separately).
Example: Robert and Maria are married filing jointly with a MAGI of $104,000. They paid $1,500 in PMI during 2026. Their income is $4,000 over the $100,000 threshold.
Calculation:
- Income over threshold: $4,000
- Reduction percentage: 40% ($4,000 ÷ $1,000 × 10%)
- Amount of reduction: $1,500 × 40% = $600
- Deductible PMI: $1,500 – $600 = $900
Mortgage insurance premiums count as part of the overall mortgage interest deduction and are subject to the $750,000 debt limitation. You’ll receive the PMI amount paid in Box 5 of Form 1098 and report it on Schedule A in the mortgage interest section.
Forms, Filing Requirements, and Procedures
Form 1098: Mortgage Interest Statement
Your mortgage lender must send you Form 1098 if you paid $600 or more in mortgage interest during the tax year. Lenders file this form with the IRS and send you a copy by January 31.
Form 1098 contains several important boxes:
- Box 1 – Total mortgage interest you paid (not including points)
- Box 2 – Outstanding mortgage principal balance as of January 1
- Box 3 – Mortgage origination date
- Box 4 – Refund of overpaid interest (if any)
- Box 5 – Mortgage insurance premiums paid (starting in 2026)
- Box 6 – Points paid on a purchase of your main home
Box 2 (outstanding principal) and Box 3 (origination date) help you determine whether your mortgage is grandfathered under the old $1 million limit or subject to the new $750,000 limit. Box 3 is particularly important: if the date is December 15, 2017 or earlier, your mortgage is grandfathered.
Common Form 1098 issues:
When multiple borrowers exist on a mortgage, the lender typically sends Form 1098 to only the primary borrower. If you’re a co-borrower who didn’t receive Form 1098, you can still deduct your share of the interest you actually paid. You should obtain a copy from the primary borrower or attach a statement to your return explaining why you don’t have Form 1098 and showing your calculation.
If you pay mortgage interest to someone who is not in the business of lending (such as buying a home directly from the seller with seller financing), you won’t receive Form 1098. You can still deduct the interest, but you must report it on Schedule A, Line 8b instead of Line 8a, and you must include the seller’s name, address, and Social Security number or Employer Identification Number.
Schedule A: Itemized Deductions
To claim the mortgage interest deduction, you must itemize deductions by filing Schedule A with your Form 1040. This means you’re giving up the standard deduction, so itemizing only makes sense if your total itemized deductions exceed the standard deduction amount.
For 2026, the standard deduction is:
| Filing Status | Standard Deduction |
|---|---|
| Single | $16,100 |
| Married Filing Jointly | $32,200 |
| Married Filing Separately | $16,100 |
| Head of Household | $24,150 |
To claim mortgage interest on Schedule A, you report it in the “Interest You Paid” section:
- Line 8a – Home mortgage interest and points reported on Form 1098
- Line 8b – Home mortgage interest not reported on Form 1098
If your mortgage exceeds the debt limits and you must calculate a limitation, you perform the calculation separately (using the worksheet in IRS Publication 936) and enter only the allowable amount on Line 8a or 8b.
Form 8829: Business Use of Your Home
If you claim a home office deduction for a business you run from your home, you must allocate mortgage interest between personal and business use using Form 8829.
The business percentage is calculated by dividing the square footage of your home office by the total square footage of your home. For example, if your home office occupies 200 square feet of a 2,000-square-foot home, your business percentage is 10%.
You then multiply your total mortgage interest by the business percentage to determine the business portion, which you claim on Form 8829 and ultimately on Schedule C (if you’re a sole proprietor). The remaining personal portion goes on Schedule A, subject to the normal mortgage interest deduction limitations.
Critical rule: When calculating the personal portion for Schedule A, you must first apply the mortgage interest limitation rules as if all the interest were personal, then subtract the business portion. You cannot claim mortgage interest as a direct business expense in Column (a) of Form 8829 because the limitations on deductible mortgage interest as a personal expense use all loans secured by your home.
If your mortgage interest exceeds the amount deductible as a personal expense due to the $750,000 debt limit, you may be able to deduct the excess on Line 16 of Form 8829, but only if the loan was used to buy, build, or substantially improve the home.
Example: Christina has a $1 million mortgage on her home and pays $50,000 in interest. She uses 15% of her home exclusively for business. Because her mortgage exceeds the $750,000 limit, only 75% of her interest ($37,500) would be deductible as a personal expense.
She cannot deduct $37,500 × 15% = $5,625 on Form 8829. Instead, she must follow the Form 8829 instructions, which may allow her to deduct more than $5,625 if the loan was used to buy or improve the home.
State Tax Considerations
While federal law governs the mortgage interest deduction for federal income tax purposes, states have their own rules regarding itemized deductions.
Thirty states plus the District of Columbia allow itemized deductions on state income tax returns. Of these, four states—Arkansas, California, Hawaii, and New York—still use the $1 million mortgage debt limit for state purposes even though federal law reduced it to $750,000. The remaining 26 states and D.C. follow the federal $750,000 limit.
Nine states have no personal income tax, so the mortgage interest deduction provides no state benefit: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming. Residents of these states only benefit at the federal level.
The SALT Cap and Total Itemized Deduction Strategy
Understanding the $10,000 SALT Limitation
The Tax Cuts and Jobs Act capped the state and local tax (SALT) deduction at $10,000 per year ($5,000 if married filing separately). This cap applies to the combined total of:
- State and local income taxes (or sales taxes if you elect to deduct sales taxes instead)
- Real estate property taxes on all properties
- Personal property taxes
The SALT cap significantly affects whether itemizing makes sense, particularly for homeowners in high-tax states like California, New York, New Jersey, Connecticut, and Illinois.
Example: David and Lisa are married filing jointly. They paid $18,000 in mortgage interest, $12,000 in property taxes, and $8,000 in state income taxes. Their total SALT (property taxes plus state income taxes) equals $20,000, but the SALT cap limits them to deducting only $10,000. Their total itemized deductions are $28,000 ($18,000 mortgage interest + $10,000 SALT). This exceeds the married filing jointly standard deduction of $32,200 for 2026, so they should take the standard deduction instead.
Note: The One Big Beautiful Bill Act temporarily increased the SALT cap to $40,000 for tax years 2025-2029, but this applies only to those years and may not be extended.
Making the Itemize vs. Standard Deduction Decision
The decision to itemize depends on comparing your total allowable itemized deductions to the standard deduction for your filing status.
Common itemized deductions include:
- Mortgage interest (subject to limitations discussed)
- State and local taxes (capped at $10,000 or $40,000 for 2025-2029)
- Charitable contributions
- Medical expenses exceeding 7.5% of AGI
- Casualty and theft losses from federally declared disasters
Decision framework:
| Total Itemized Deductions | Recommended Action |
|---|---|
| Less than standard deduction | Take the standard deduction; do not itemize |
| Within $500 of standard deduction | Consider taking standard deduction due to simplicity unless specific tax planning reasons exist |
| Exceeds standard deduction by $500+ | Itemize to maximize tax savings |
The mortgage interest deduction only provides a tax benefit if you itemize and your total itemized deductions exceed the standard deduction. This is why only 8% of households benefit from the mortgage interest deduction—most taxpayers find the standard deduction more advantageous.
Tax Savings Calculation Example
Understanding how the mortgage interest deduction actually reduces your tax bill requires distinguishing between deductions and tax savings.
A deduction reduces your taxable income, not your tax bill dollar-for-dollar. Your actual tax savings equals the deduction multiplied by your marginal tax rate.
Example: Robert is single with a taxable income of $80,000, placing him in the 22% tax bracket for 2026. He paid $15,000 in mortgage interest and has $3,000 in other itemized deductions, for a total of $18,000 in itemized deductions. The standard deduction for single filers is $16,100.
If Robert takes the standard deduction:
- Taxable income: $80,000 – $16,100 = $63,900
If Robert itemizes:
- Taxable income: $80,000 – $18,000 = $62,000
The difference in taxable income is $1,900 ($63,900 – $62,000). At a 22% tax rate, Robert saves $418 in federal income tax by itemizing ($1,900 × 22%).
This illustrates an important point: Robert paid $15,000 in mortgage interest but only saved $418 in taxes. The deduction reduced his tax bill by roughly 2.8 cents per dollar of interest paid, not dollar-for-dollar.
Common Scenarios: How the Deduction Works in Practice
Scenario 1: First-Time Homebuyer with Small Mortgage
Situation: Emma is a single first-time homebuyer who purchased a $250,000 condo in 2024 with a $225,000 mortgage at 6.5% interest. She paid $14,625 in mortgage interest during 2025. She also paid $4,200 in property taxes and $2,500 in state income taxes. She made $1,200 in charitable contributions.
| Item | Amount |
|---|---|
| Mortgage interest | $14,625 |
| Property taxes + state taxes (capped at SALT limit) | $6,700 |
| Charitable contributions | $1,200 |
| Total itemized deductions | $22,525 |
| Standard deduction (single, 2026) | $16,100 |
| Benefit of itemizing | $6,425 |
Outcome: Emma should itemize because her itemized deductions exceed the standard deduction by $6,425. If Emma is in the 24% tax bracket, itemizing saves her approximately $1,542 in federal income tax compared to taking the standard deduction ($6,425 × 24% = $1,542).
Scenario 2: High-Income Homeowner Exceeding Debt Limits
Situation: Michael is married filing jointly with a $1.2 million mortgage (originated in 2023) on his primary residence. He paid $72,000 in mortgage interest during 2025. He also paid $15,000 in property taxes, $10,000 in state income taxes, and $8,000 in charitable contributions.
Calculation of deductible mortgage interest:
- Mortgage balance: $1,200,000
- Applicable limit: $750,000
- Limitation percentage: $750,000 ÷ $1,200,000 = 62.5%
- Deductible interest: $72,000 × 62.5% = $45,000
| Item | Amount |
|---|---|
| Mortgage interest (limited) | $45,000 |
| Property taxes + state taxes (capped at SALT limit for 2026) | $10,000 |
| Charitable contributions | $8,000 |
| Total itemized deductions | $63,000 |
| Standard deduction (married filing jointly, 2026) | $32,200 |
| Benefit of itemizing | $30,800 |
Outcome: Even though Michael’s mortgage interest is limited, itemizing still provides significant benefit. If Michael is in the 35% tax bracket, itemizing saves him approximately $10,780 in federal income tax compared to the standard deduction ($30,800 × 35% = $10,780).
Scenario 3: Homeowner with Second Home
Situation: Jennifer is married filing jointly and owns a primary residence with a $400,000 mortgage and a beach house with a $500,000 mortgage, both originated in 2022. She paid $24,000 in interest on her primary residence and $30,000 on the beach house, for total interest of $54,000. She also has $8,000 in property taxes and $6,000 in state income taxes.
Calculation of deductible mortgage interest:
- Combined mortgage balance: $900,000
- Applicable limit: $750,000
- Limitation percentage: $750,000 ÷ $900,000 = 83.33%
- Deductible interest: $54,000 × 83.33% = $45,000
| Item | Amount |
|---|---|
| Mortgage interest (limited) | $45,000 |
| Property taxes + state taxes (capped at SALT limit for 2026) | $10,000 |
| Total itemized deductions | $55,000 |
| Standard deduction (married filing jointly, 2026) | $32,200 |
| Benefit of itemizing | $22,800 |
Outcome: Jennifer should itemize. The combined mortgage debt on both homes counts against the single $750,000 limit, but she can still deduct $45,000 in interest, which provides substantial tax savings.
Mistakes to Avoid When Claiming the Mortgage Interest Deduction
Claiming Interest You Didn’t Actually Pay
The most fundamental error is deducting mortgage interest that you didn’t actually pay during the tax year. Only the person legally obligated on the debt who actually makes the payments can claim the deduction.
Example: Your father makes your mortgage payments as a gift. You cannot deduct the interest because you didn’t pay it, even though you’re legally liable on the loan. Your father also cannot deduct it because he’s not legally obligated on the debt.
The reverse situation also creates problems: If you pay mortgage interest on someone else’s home (such as helping your elderly parents), you cannot deduct it because the loan isn’t secured by your qualified residence.
Deducting the Wrong Year for Property Taxes
Homeowners often confuse the year they pay property taxes with the year they can deduct them. You can only deduct property taxes in the year you actually paid them, not when the tax was assessed or when the bill was issued.
This creates confusion when you pay property taxes through an escrow account. Your mortgage servicer collects monthly escrow payments from you, but you can only deduct the property taxes in the year the servicer pays them to the taxing authority, not when you pay the servicer.
Example: Your mortgage servicer requires you to pay $500 per month into escrow for property taxes. During 2025, you paid the servicer $6,000. However, the servicer only paid $5,500 to the county (one payment was late and went out in January 2026). You can only deduct $5,500 on your 2025 return, not the $6,000 you paid to the servicer.
Confusing Escrow Payments with Actual Expenses
Similar to property taxes, homeowners sometimes deduct the total amount shown in Box 4 of their mortgage servicer’s year-end statement, which includes escrow payments for property taxes and insurance, rather than just the interest amount.
Your monthly mortgage payment typically consists of principal, interest, property taxes, and insurance (PITI). Only the interest portion is deductible as mortgage interest, and property taxes are separately deductible (subject to the SALT cap). Insurance is not deductible at all for personal residences.
Always rely on Form 1098, Box 1 for your mortgage interest, not your monthly payment amount or annual payment total.
Deducting Points Paid on a Refinance in the First Year
Points paid when refinancing your mortgage generally cannot be deducted in full in the year you pay them. Instead, you must spread the deduction over the life of the new loan.
This differs from points paid on a purchase mortgage, which often can be deducted in full in the year of purchase. Homeowners who deducted points in full when they bought their home sometimes incorrectly assume refinance points work the same way.
Example: You refinance to a 30-year loan and pay $6,000 in points. You must deduct $200 per year ($6,000 ÷ 30 years) over the life of the loan, not $6,000 in the year you refinance.
Claiming Interest on Loans Not Secured by Your Home
Interest on personal loans, car loans, student loans, and credit cards is not deductible as mortgage interest, even if you use the proceeds to make home improvements.
For interest to qualify as mortgage interest, the loan must be secured by your home, meaning the lender has a mortgage or deed of trust filed against your property. Using an unsecured personal loan to remodel your kitchen does not create deductible mortgage interest, even though you used the money for substantial improvements.
Similarly, if you take out a home equity line of credit secured by your home but use the proceeds to pay off credit cards or buy a car, that interest is not deductible under the current rules.
Forgetting to Prorate for Partial-Year Ownership
If you buy or sell your home during the year, you can only deduct mortgage interest for the period you actually owned the home. You must prorate the deduction based on the number of days you owned the property.
Example: You bought your home on September 1, 2025. You owned it for 122 days during 2025 (September through December). If Form 1098 shows $3,000 in interest, you should verify this represents only the period you owned the home. If the $3,000 includes interest paid by the previous owner before closing, you must reduce your deduction accordingly.
Misreporting Home Equity Loan Interest
The most common error with home equity loans is claiming a deduction for interest when the loan proceeds were used for non-qualifying purposes.
Since 2018, home equity loan interest is deductible only if you used the borrowed funds to buy, build, or substantially improve the home securing the loan. Using a HELOC to pay for college tuition, consolidate credit card debt, or buy a car makes the interest non-deductible, even though the loan is secured by your home.
The IRS requires you to trace the use of proceeds. Keep documentation showing you used the funds for qualifying improvements: contractor invoices, receipts, canceled checks, and building permits.
Example: You borrow $60,000 through a HELOC. You use $40,000 to add a bedroom and $20,000 to buy a boat. Only the interest allocable to the $40,000 used for the home addition is deductible. The interest on the $20,000 used for the boat is not deductible.
Not Comparing Itemized vs. Standard Deduction
Claiming the mortgage interest deduction requires itemizing, which means giving up the standard deduction. Some taxpayers itemize out of habit without checking whether their total itemized deductions actually exceed the standard deduction for their filing status.
Since the standard deduction nearly doubled under the TCJA, many homeowners now fare better by taking the standard deduction, particularly those with smaller mortgages in low-tax states.
Example: You’re married filing jointly with $20,000 in mortgage interest and $6,000 in property taxes, for total itemized deductions of $26,000. The standard deduction for 2026 is $32,200. You should take the standard deduction instead of itemizing, saving yourself the paperwork while getting a larger deduction.
Both Borrowers Deducting the Full Amount
When two people co-borrow on a mortgage, the lender typically sends Form 1098 to only the primary borrower. If both borrowers file separate tax returns (such as unmarried partners or couples who are married filing separately), each person can only deduct the interest they actually paid.
The most common error is both co-borrowers claiming the full amount shown on Form 1098, effectively deducting the same interest twice. This triggers IRS computer matching and often results in audits.
Example: You and your brother jointly own a rental property that you use as second homes. You each pay half the mortgage payments. Form 1098 shows $18,000 in interest. You can deduct $9,000, and your brother can deduct $9,000. You cannot both deduct $18,000.
If you’re married filing jointly, this issue doesn’t arise because your return combines both spouses’ income and deductions.
Claiming Interest on a Mortgage Not in Your Name
Only the person legally liable on the mortgage can deduct the interest, and only if they actually pay it. You cannot deduct mortgage interest on a loan that’s solely in someone else’s name, even if you make the payments or own the property.
Example: Your home is titled in your name alone, but your spouse’s name is the only one on the mortgage. If you make the mortgage payments from a joint account, your spouse should claim the deduction (or you should if filing jointly). But if you file separately and your spouse doesn’t make the payments, neither of you can deduct the interest.
The exception to this rule is for tenant-stockholders in cooperatives, who can deduct their allocable share of the cooperative corporation’s interest even though the loan isn’t in their individual names.
Do’s and Don’ts for Maximizing Your Deduction
Do’s
✓ Do keep detailed records of how you use borrowed funds. When you take out a home equity loan or refinance with cash out, document exactly how you spend the proceeds. Save contractor invoices, receipts, canceled checks, and permits to prove you used funds for qualifying home improvements. This documentation becomes critical if the IRS audits your return and questions your mortgage interest deduction.
✓ Do verify your Form 1098 information against your own records. Lenders sometimes make mistakes on Form 1098, reporting incorrect interest amounts or wrong origination dates. Compare Box 1 on Form 1098 to your year-end mortgage statement and your payment records. If you find discrepancies, contact your lender for a corrected Form 1098 before filing your return.
✓ Do calculate whether itemizing or taking the standard deduction saves you more money. Add up all your potential itemized deductions (mortgage interest, property taxes, state income taxes, charitable contributions, medical expenses) before deciding to itemize. If the total doesn’t exceed your standard deduction, you’re better off taking the standard deduction. Run the numbers both ways each year because your situation may change.
✓ Do consider bunching deductions in alternating years. If your itemized deductions are close to the standard deduction, consider “bunching” charitable contributions and other controllable deductions into one year to maximize itemizing that year, then taking the standard deduction in alternate years. This strategy can increase your total deductions over a two-year period compared to itemizing every year with marginal benefit.
✓ Do allocate mortgage interest properly between personal and business use if you have a home office. If you claim a home office deduction, correctly calculate the business percentage using Form 8829. The business portion reduces your self-employment tax and AGI, which can create beneficial ripple effects throughout your tax return. Don’t claim all your mortgage interest on Schedule A if part belongs on Form 8829.
✓ Do maintain grandfathered mortgage status carefully when refinancing. If you have a grandfathered mortgage (originated on or before December 15, 2017) that qualifies for the $1 million debt limit, preserve this status by not exceeding your remaining balance when refinancing and not extending the original loan term. Taking cash out or extending the term causes you to lose grandfathered treatment on the excess amount.
✓ Do claim your tenant-stockholder deduction if you own a cooperative apartment. If you own shares in a cooperative housing corporation, claim your allocable share of the building’s mortgage interest and property taxes as provided on your annual statement from the cooperative. This deduction often gets overlooked because cooperative owners don’t receive Form 1098, but it’s fully available if your cooperative qualifies.
Don’ts
✗ Don’t deduct interest on mortgage debt used for non-qualifying purposes. Resist the temptation to deduct all your home equity loan interest without considering how you used the proceeds. Since 2018, home equity interest is only deductible if you used the funds to buy, build, or substantially improve your qualified residence. Using a HELOC to pay off credit cards, buy a car, or pay college tuition makes the interest non-deductible, even though your home secures the loan.
✗ Don’t ignore the debt limitations when calculating your deduction. If your mortgage balance exceeds $750,000 (or $1 million for grandfathered loans), you cannot deduct all your mortgage interest. You must calculate the limitation percentage and only deduct the proportional amount of interest. Claiming the full interest amount when your mortgage exceeds the limits is a common error that triggers IRS notices.
✗ Don’t deduct mortgage insurance premiums on your 2025 tax return. The mortgage insurance premium deduction expired at the end of 2021 and doesn’t become available again until tax year 2026. Taxpayers filing their 2025 returns in 2026 cannot deduct PMI or MIP paid during 2025. This is a common error because the deduction was available from 2007 through 2021, and many taxpayers don’t realize it lapsed.
✗ Don’t claim points paid on a refinance in full the first year. Points paid when refinancing must be amortized over the life of the new loan, not deducted all at once. Only points paid on the original purchase of your main home can typically be deducted in full in the year paid. Deducting refinance points in full in year one is a common mistake that the IRS catches through its automated systems.
✗ Don’t forget to reduce your home’s basis when the seller pays points on your behalf. If the seller pays points for you when you buy your home, you can deduct those points, but you must reduce your home’s cost basis by the amount the seller paid. This affects your capital gain calculation when you eventually sell the home. Failing to reduce basis means you’ll overstate your gain and pay more capital gains tax than required when you sell.
✗ Don’t itemize without sufficient total deductions to exceed the standard deduction. Itemizing creates extra paperwork and complexity, so only do it when it saves you money. If your mortgage interest plus other itemized deductions don’t exceed your standard deduction, you gain nothing from itemizing and increase your risk of errors. The IRS data shows many taxpayers itemize when the standard deduction would be better.
✗ Don’t mix up property tax payments with escrow deposits. You can only deduct property taxes in the year your mortgage servicer actually pays them to the taxing authority, not when you deposit funds into escrow. Your year-end escrow account statement shows both what you paid to the servicer and what the servicer paid to the taxing authority—you deduct only the latter amount.
Pros and Cons of the Mortgage Interest Deduction
Pros
⊕ Reduces the after-tax cost of homeownership significantly for qualifying taxpayers. For homeowners who itemize deductions and have substantial mortgage debt, the interest deduction can save thousands of dollars in federal income tax annually. A taxpayer in the 32% bracket who deducts $30,000 in mortgage interest saves $9,600 in federal tax. This reduction makes homeownership more affordable during the early years of a mortgage when interest payments are highest.
⊕ Creates parity between homeowners and investors regarding interest deductibility. Businesses and real estate investors can deduct interest paid on debt used to acquire income-producing property. The mortgage interest deduction extends similar treatment to personal residences, recognizing that homeownership serves both consumption and investment purposes. Without this deduction, individuals would face an economic disadvantage compared to other property owners.
⊕ Encourages long-term wealth building through homeownership. By reducing the cost of carrying mortgage debt, the deduction makes it easier for families to afford homes and build equity over time. Homeownership remains the primary wealth-building vehicle for middle-class American families, and the mortgage interest deduction supports this wealth accumulation by reducing monthly after-tax housing costs.
⊕ Provides the greatest benefit when homeowners need it most—early in the loan term. Mortgage payments in the first years of a loan consist primarily of interest, which means the deduction is most valuable when your mortgage balance is highest and your home equity is lowest. This front-loaded benefit helps homeowners manage cash flow during the period when they have the least home equity and face the highest financial stress.
⊕ Benefits homeowners in high-cost housing markets where affordability is most challenging. In expensive areas like San Francisco, New York, Boston, and Los Angeles, median home prices require mortgages that approach or exceed the $750,000 debt limit. Even with the limitations, the deduction provides meaningful tax relief for middle-income families trying to afford homes in these markets.
Cons
⊖ Provides no benefit to the 92% of taxpayers who don’t itemize deductions. Because the standard deduction nearly doubled under the TCJA, fewer than 10% of households itemize deductions, which means the vast majority of homeowners receive no benefit from the mortgage interest deduction. This includes many first-time homebuyers and those with smaller mortgages who could most benefit from homeownership incentives.
⊖ Disproportionately benefits high-income households rather than those who need help most. Approximately 75% of the tax benefit from the mortgage interest deduction flows to households earning over $200,000 annually. High-income taxpayers benefit more because they’re more likely to itemize, more likely to have mortgages exceeding the average amount, and face higher marginal tax rates that make each dollar of deduction more valuable.
⊖ May increase home prices by capitalizing the tax benefit into property values. Economic research suggests that the mortgage interest deduction gets capitalized into home prices, meaning sellers raise prices because buyers can afford higher mortgages due to the tax benefit. This capitalization can make homes less affordable, particularly for first-time buyers, defeating the deduction’s intended purpose of promoting homeownership.
⊖ Creates complexity and increased compliance costs for taxpayers. Calculating limitations when mortgage debt exceeds $750,000, allocating between personal and business use, tracing home equity loan proceeds, and prorating for multiple properties all add complexity to tax preparation. Many taxpayers make errors in these calculations, leading to IRS notices, audits, and potential penalties. The complexity also drives taxpayers toward paid tax preparers, increasing the cost of tax compliance.
⊖ Costs the federal government substantial revenue that could fund other priorities. The mortgage interest deduction reduces federal revenue by approximately $34 billion annually in its current form. This represents a significant expenditure of public funds that could alternatively support affordable housing programs, rental assistance, or infrastructure investments that might benefit a broader population.
⊖ Does little to promote homeownership among renters or first-time buyers. Research shows that homeownership rates in the United States are similar to countries like Canada and the United Kingdom that don’t offer a mortgage interest deduction. This suggests the deduction primarily benefits those who would buy homes anyway rather than inducing marginal buyers to enter the market. Renters—who often struggle most with housing costs—receive no benefit from this $34 billion annual tax expenditure.
Frequently Asked Questions
Can I deduct mortgage interest if I don’t itemize deductions?
No. You can only claim the mortgage interest deduction if you itemize deductions on Schedule A instead of taking the standard deduction. Most taxpayers take the standard deduction because it’s simpler and often larger.
Is the mortgage interest deduction available for investment properties or rental homes?
No. The mortgage interest deduction under IRC Section 163(h) applies only to qualified residences (your main home and one second home). Rental property mortgage interest is fully deductible on Schedule E as a business expense with no debt limitations.
Can I deduct interest on a mortgage for a third home or vacation property?
No. You can only deduct mortgage interest on your primary residence and one designated second home per year. Interest on mortgages for additional properties provides no tax benefit unless you treat them as rental properties.
Do I need Form 1098 to claim the mortgage interest deduction?
No. You can claim the deduction without Form 1098 if you paid $600 or more in interest. Report it on Schedule A, Line 8b, and include the lender’s information. Lenders must provide Form 1098 when you pay $600+ in interest.
Can I deduct mortgage interest if I’m paying off a loan to a family member for my home?
Yes, if the loan is properly secured by your home through a recorded mortgage or deed of trust. Report it on Schedule A, Line 8b, and provide the family member’s information. The arrangement must be a legitimate debt, not a gift.
What happens to unamortized points when I refinance or pay off my mortgage early?
Yes. You can deduct all remaining unamortized points in the year you pay off the original loan, whether through refinancing, sale, or early payoff. If you refinance with the same lender, remaining points continue amortizing over the new loan.
Can married couples filing separately both deduct mortgage interest on the same home?
Yes, but only for the interest each person actually paid, and the combined deduction cannot exceed the limitation based on $375,000 of debt. Each spouse reports their share on their separate Schedule A.
Is interest on a reverse mortgage tax deductible?
No, not until you actually pay it. Reverse mortgages allow interest to accumulate and be paid when the loan matures. You can only deduct interest in the year you pay it, typically when selling the home or refinancing.
Can I deduct mortgage interest on a home I’m building before I move in?
Yes. You can treat a home under construction as a qualified residence for up to 24 months, as long as it becomes your residence when construction is complete. Construction loan interest during this period is deductible.
What if my Form 1098 shows a different interest amount than I actually paid?
Yes. Contact your lender immediately to request a corrected Form 1098. Deduct the amount you actually paid and keep documentation. If the lender won’t correct it, attach an explanation to your return showing the correct amount.
Can I deduct interest on a loan secured by my home if I used the money for business purposes?
Yes, but you deduct it as a business expense on Schedule C or the appropriate business form, not as mortgage interest on Schedule A. The interest must be allocated to the business use of the borrowed funds.
Does the mortgage interest deduction apply to co-op apartment owners?
Yes. Tenant-stockholders in qualified cooperative housing corporations can deduct their proportionate share of the corporation’s mortgage interest and property taxes. The cooperative provides an annual statement showing your allocable share by January 31.
Can I deduct mortgage interest if someone else makes the payments for me?
No. You can only deduct mortgage interest that you actually pay. If a family member or partner makes your mortgage payments, even as a gift, you cannot claim the deduction because you didn’t pay the interest.
Is mortgage insurance (PMI or MIP) tax deductible?
Yes, starting with tax year 2026. The One Big Beautiful Bill Act reinstated the mortgage insurance premium deduction for contracts issued after 2006. The deduction phases out for incomes above $100,000 and eliminates completely above $109,000.
Can I deduct interest on a home equity loan used to pay off credit card debt?
No. Since 2018, home equity loan interest is only deductible if you used the borrowed funds to buy, build, or substantially improve your qualified residence. Using funds for debt consolidation makes the interest non-deductible.
What if I buy or sell my home in the middle of the year?
Yes. You can deduct mortgage interest only for the period you owned the home. Your lender’s Form 1098 should only show interest for your ownership period. Prorate if the form incorrectly includes the previous owner’s portion.
Can I deduct points and mortgage interest in the same year?
Yes. Points paid on the purchase of your main home can typically be deducted in full in the year paid, in addition to the regular mortgage interest deduction, as long as both meet the applicable requirements.
Does refinancing affect my grandfathered mortgage status under the old $1 million limit?
Yes. You can maintain grandfathered status only if you refinance for an amount not exceeding your remaining balance and don’t extend beyond the original loan term. Cash-out refinancing or extending the term causes you to lose grandfathered treatment.
Can I deduct interest if I rent out my primary residence for part of the year?
Yes, but you must allocate expenses between rental and personal use. The personal portion goes on Schedule A subject to normal limitations. The rental portion goes on Schedule E. Keep careful records of rental days versus personal days.
Is there a minimum mortgage amount required to claim the deduction?
No. There’s no minimum mortgage amount. However, lenders only issue Form 1098 if you paid $600 or more in interest. You can still deduct interest below $600, but you must report it on Line 8b without Form 1098.