Does Schedule-C Pay Self-Employment Tax? (w/Examples) + FAQs

Yes. If you file Schedule C with net earnings of $400 or more, you owe self-employment (SE) tax on that profit. This tax funds your Social Security and Medicare, and it is calculated on Schedule SE and reported on your Form 1040.

Self-employment tax exists because sole proprietors have no employer to split payroll taxes with them. Under IRC §1401, the government charges self-employed workers 15.3% on 92.35% of their net profit up to the Social Security wage base, plus 2.9% Medicare on earnings above that cap. The rule comes from the Self-Employment Contributions Act (SECA), which mirrors the FICA tax that W-2 workers and their employers share.

Over 27 million Americans file Schedule C each year, according to IRS Statistics of Income data, and most of them owe SE tax on top of regular income tax. Missing this tax triggers penalties under IRC §6654 for underpaid estimated taxes, plus interest that compounds daily.

Here is what you will learn in this guide:

• 💰 How the 15.3% SE tax is calculated step-by-step on your Schedule C profit
• 📋 Who must file Schedule SE and the exact $400 net earnings threshold
• 🧾 Which deductions lower both your income tax and your SE tax liability
• ⚖️ How an S-Corp election can legally reduce SE tax using reasonable compensation rules
• 🚫 The top filing mistakes that trigger IRS audits and expensive penalties

How Schedule C Connects to Self-Employment Tax

Schedule C reports the profit or loss from a sole proprietorship or single-member LLC, and that bottom-line number flows into two places on your return. It flows to Schedule 1 of Form 1040 as ordinary income, and it flows to Schedule SE to calculate self-employment tax. The IRS Schedule C instructions confirm that line 31 net profit drives both calculations.

The governing rule lives in IRC §1402(a), which defines “net earnings from self-employment” as gross income from any trade or business, minus allowable deductions. This definition matters because SE tax only applies to active business income, not to passive rents, dividends, or capital gains. A common misconception is that all 1099-NEC income automatically triggers SE tax, but the rule only fires when the activity rises to the level of a trade or business under the Groetzinger standard set by the Supreme Court in 1987.

The consequence of ignoring the SE tax piece is severe, because the IRS matches every 1099-NEC and 1099-K against your return through its Automated Underreporter program. If you report Schedule C income but skip Schedule SE, you will receive a CP2000 notice proposing the missing tax plus penalties. For example, Maria earns $40,000 freelancing as a writer, reports it on Schedule C, but forgets Schedule SE. The IRS will add roughly $5,652 in SE tax, plus failure-to-pay penalties of 0.5% per month, plus interest.

The $400 Filing Threshold

The threshold rule under IRC §1402(b) requires you to file Schedule SE if your net earnings from self-employment reach $400 or more in a tax year. In plain English, once your Schedule C profit hits $400, Uncle Sam wants his Social Security and Medicare cut. The consequence of falling below $400 is that you owe no SE tax, but you still report the income for regular income tax purposes.

A common misconception is that the $400 is a per-job threshold, but it is actually a total across all self-employment activities for the year. For example, James drives for Uber and earns $250 in net profit, and he also sells on Etsy for $200 in net profit. His combined $450 crosses the threshold, so he owes SE tax on the full $450.

The 92.35% Adjustment

Before applying the 15.3% rate, you multiply your net Schedule C profit by 0.9235. This adjustment exists because IRC §1402(a)(12) treats the employer-equivalent half of SE tax as a business expense, effectively shrinking the taxable base. The plain-English reason is fairness — W-2 workers do not pay FICA on the employer’s share, so self-employed people get a similar break.

The consequence of skipping this step is that you overpay SE tax by roughly 7.65%. A common misconception is that you deduct this on Schedule C itself, but the adjustment happens on Schedule SE line 4a. For example, Priya has a $50,000 Schedule C profit, multiplies by 0.9235 to get $46,175, and applies 15.3% to owe $7,064.78 in SE tax.

Breaking Down the 15.3% Self-Employment Tax Rate

The 15.3% rate has two pieces, and understanding each piece helps you plan around wage base caps and additional Medicare surtaxes. The Social Security portion is 12.4% on earnings up to the annual wage base, and the Medicare portion is 2.9% on all earnings with no cap. The Social Security Administration publishes the wage base each fall for the coming year.

For the 2025 tax year filed in 2026, the Social Security wage base is $176,100, meaning the maximum Social Security portion of SE tax is $21,836.40. For 2026 returns filed in 2027, the wage base rises to $183,600 based on SSA’s October 2025 announcement. The Medicare portion has no ceiling, so high earners keep paying 2.9% on every dollar above the wage base.

An Additional Medicare Tax of 0.9% kicks in under IRC §1401(b)(2) when combined wages and SE earnings exceed $200,000 for single filers or $250,000 for married filing jointly. The consequence of missing this surtax is a CP2000 letter plus penalties, because it is reported on Form 8959. A common misconception is that employers withhold enough to cover it, but self-employed people must pay it through quarterly estimates.

Social Security Portion (12.4%)

The Social Security tax of 12.4% funds retirement, disability, and survivor benefits, and it stops at the annual wage base. This cap exists because Social Security benefits also cap out, so the system balances contributions with payouts. The consequence of earning above the wage base is that you stop paying the 12.4% piece, which is a nice break for high earners.

A common misconception is that W-2 wages and SE income have separate wage base caps, but they share one combined cap. For example, Carlos earns $150,000 in W-2 wages at his day job and makes $50,000 in Schedule C profit on the side. Only $26,100 of his SE income gets hit with the 12.4% piece, because his W-2 wages already used $150,000 of the 2025 cap.

Medicare Portion (2.9% + 0.9% Surtax)

The Medicare tax of 2.9% funds Medicare Part A hospital insurance, and it applies to every dollar of SE earnings with no ceiling. The surtax adds another 0.9% on earnings above the threshold, raising the effective Medicare rate to 3.8% for high earners. The Affordable Care Act created this surtax in 2013 to help fund healthcare expansion.

The consequence of ignoring the surtax is the same as any underpayment — penalties, interest, and a CP2000. A common misconception is that the surtax applies to gross Schedule C revenue, but it applies to net earnings after the 92.35% adjustment. For example, Dr. Chen, a single filer, earns $300,000 in Schedule C profit from her consulting practice, and she owes the extra 0.9% on the portion above $200,000.

Who Must File Schedule SE

Anyone with $400 or more in net self-employment earnings must file Schedule SE, and a few special groups have different rules. Church employees with $108.28 or more in wages from a church that elected out of FICA must also file, per the IRS Schedule SE instructions. Farmers use the optional method in Part II to boost Social Security credits during low-income years.

Filer Type	SE Tax Treatment
Sole proprietor with $400+ net profit	Owes full 15.3% SE tax on 92.35% of profit
Single-member LLC (disregarded entity)	Same as sole proprietor, files Schedule C and SE
Multi-member LLC partner	Reports on Schedule K-1, pays SE tax on guaranteed payments
S-Corp owner	No SE tax on distributions, only FICA on W-2 wages
Statutory employee	Schedule C allowed, but no SE tax (FICA already paid)
Landlord (rental real estate)	No SE tax under IRC §1402(a)(1) unless real estate dealer

Statutory Employees

A statutory employee is a hybrid worker who receives a W-2 with box 13 checked and reports business expenses on Schedule C. Under IRC §3121(d)(3), statutory employees include full-time life insurance agents, certain home workers, and traveling salespeople. The plain-English reason is that these workers look like employees for Social Security purposes but like contractors for expense deduction purposes.

The consequence of misclassifying yourself as a statutory employee when you are not is double taxation, because the IRS will impose SE tax on top of the FICA already withheld. A common misconception is that any 1099 worker can elect statutory status, but the four categories listed in the regulations are exclusive. For example, Linda works as a full-time life insurance agent, receives a W-2 with box 13 checked, files Schedule C for her expenses, and does not file Schedule SE because FICA was already withheld.

Clergy and Religious Workers

Ministers face unique rules under IRC §1402(c) that treat them as self-employed for SE tax even when they receive a W-2 from their church. The plain-English reason is a historical carve-out that recognizes the dual status of clergy as both employees and independent religious leaders. The consequence of ignoring clergy rules is often paying FICA and SE tax on the same dollars.

A common misconception is that the housing allowance is tax-free for SE tax purposes, but IRC §1402(a)(8) includes it in SE earnings even though it is excluded from income tax. Ministers can file Form 4361 to opt out of SE tax based on conscientious objection, but the election is irrevocable. For example, Pastor Kim earns $60,000 in salary and a $20,000 housing allowance, and she owes SE tax on the full $80,000.

Farm Self-Employment

Farmers file Schedule F instead of Schedule C, but the SE tax treatment is nearly identical. The optional farm method in Schedule SE Part II lets farmers report higher SE earnings in low-profit years to earn Social Security credits. The consequence of skipping the optional method is losing quarters of coverage toward retirement eligibility.

A common misconception is that Conservation Reserve Program payments are always SE taxable, but IRC §1402(a)(1) excludes them for retirees receiving Social Security. For example, farmer Hank has a bad crop year with only $1,500 in profit, so he uses the optional method to report $6,920 in SE earnings to keep his Social Security credits on track.

Step-by-Step Schedule SE Calculation

Calculating SE tax follows a precise six-step path on Schedule SE, and each line has a specific legal purpose. The IRS updates Schedule SE annually, so always use the current year’s form. Miss a step and your calculation will be off, triggering IRS letters and possible penalties.

Here is the standard calculation flow for a typical sole proprietor:

1. Start with Schedule C line 31 net profit
2. Multiply by 0.9235 to get net SE earnings (Schedule SE line 4a)
3. If line 4a is below $400, stop — no SE tax owed
4. Apply 12.4% Social Security to the lesser of line 4a or the wage base
5. Apply 2.9% Medicare to the full line 4a amount
6. Add them together for total SE tax on line 12

The consequence of an error at any step is a cascading mistake that affects your 1040 line 23, your Schedule 1 line 15 deduction, and your estimated tax calculation. A common misconception is that TurboTax or other software catches every error, but garbage-in-garbage-out applies — if you enter wrong numbers on Schedule C, the software dutifully calculates wrong SE tax.

The Deduction for Half of SE Tax

Under IRC §164(f), you can deduct half of your SE tax as an above-the-line adjustment on Schedule 1 line 15. This deduction exists because W-2 workers do not pay income tax on the employer’s share of FICA, so self-employed people get the same economic treatment. The plain-English way to think about it is that the IRS refunds a piece of your SE tax through income tax savings.

The consequence of forgetting this deduction is overpaying income tax by 10% to 37% of half your SE tax. A common misconception is that this deduction reduces SE tax itself, but it only reduces income tax. For example, Sofia owes $7,065 in SE tax, deducts $3,532 on Schedule 1, and saves roughly $777 in income tax at the 22% bracket.

Three Common Schedule C + SE Tax Scenarios

Real taxpayers face predictable situations, and these three scenarios cover the most common Schedule C and SE tax patterns. Each table shows the filing move and the tax outcome in plain terms.

Scenario 1: The Freelance Side Hustler

Filing Move	Tax Outcome
Maria earns $8,000 freelancing while working a W-2 job	Files Schedule C plus Schedule SE
Reports $8,000 on Schedule C line 31	Multiplies by 0.9235 = $7,388
Applies 15.3% SE tax	Owes $1,130 SE tax
Deducts half ($565) on Schedule 1	Saves ~$124 income tax at 22% bracket
Pays remaining SE tax with Form 1040	Must also make quarterly estimates going forward

Scenario 2: The Full-Time Sole Proprietor

Filing Move	Tax Outcome
James runs a solo consulting practice earning $120,000 net	Owes full SE tax plus income tax
Multiplies $120,000 by 0.9235 = $110,820	Full amount under 2025 wage base
Applies 15.3%	Owes $16,955 SE tax
Deducts $8,478 on Schedule 1	Reduces AGI and income tax
Must pay quarterly estimates via Form 1040-ES	Avoids §6654 underpayment penalty

Scenario 3: The High-Earning Specialist

Filing Move	Tax Outcome
Dr. Chen earns $300,000 Schedule C profit as a consultant	Triggers wage base cap plus Medicare surtax
Net SE earnings = $277,050 after 92.35%	Only $176,100 subject to Social Security
Social Security portion = $21,836	Medicare portion = $8,034 on full $277,050
Additional 0.9% surtax on income above $200,000	Extra ~$693 on Form 8959
Total SE + Medicare surtax ~ $30,563	Plus QBI deduction under §199A may apply

Real-World Named Examples

Example 1: Rideshare Driver Carlos

Carlos drives for Uber and Lyft part-time and nets $18,000 after mileage deductions using the standard mileage rate of 70 cents per mile for 2025. He reports the $18,000 on Schedule C and $16,623 as net SE earnings after the 92.35% adjustment. His SE tax bill is $2,543, and he deducts $1,272 on Schedule 1.

The key lesson is that mileage is Carlos’s biggest weapon against SE tax, because every mile deducted is a dollar not subject to the 15.3% hit. A common mistake rideshare drivers make is forgetting to track mileage from the moment the app turns on, not just during paid rides. Carlos uses an app like MileIQ to log every mile and keeps a backup spreadsheet.

Example 2: Etsy Seller Priya

Priya sells handmade jewelry on Etsy and nets $25,000 after the cost of goods sold and platform fees. She reports the income on Schedule C, owes $3,532 in SE tax, and also qualifies for the Qualified Business Income deduction under IRC §199A which shaves 20% off her qualified business income for income tax purposes. The QBI deduction does not reduce SE tax, only income tax.

Priya also deducts her home studio as a home office under IRC §280A(c)(1) using the simplified method at $5 per square foot up to 300 square feet. The consequence of claiming the home office is a lower Schedule C profit, which lowers both income tax and SE tax. A common mistake is skipping the home office for fear of audit, but the simplified method is low-risk.

Example 3: Consultant Watson and the S-Corp Lesson

In the landmark Watson v. Commissioner case decided in 2012, the Eighth Circuit upheld the IRS reclassification of distributions as wages when Watson, a CPA, paid himself only $24,000 in salary from his S-Corp while taking $200,000 in distributions. The court applied the reasonable compensation standard and imposed additional FICA, penalties, and interest. This ruling guides every S-Corp owner today.

The plain-English takeaway is that S-Corp election can legally reduce SE tax, but only if the owner pays themselves a reasonable salary subject to FICA. The consequence of lowballing the salary is exactly what happened to Watson — back taxes, penalties under IRC §6662, and interest. A common misconception is that any salary works, but the IRS looks at industry comparables, hours worked, and skill level.

Mistakes to Avoid

Self-employed taxpayers make the same expensive errors year after year, and each one has a specific negative consequence. Learning these in advance saves thousands in penalties and lost deductions.

• Skipping Schedule SE entirely when Schedule C shows $400+ profit, which triggers a CP2000 notice plus failure-to-pay penalties of 0.5% per month
• Forgetting the half-SE-tax deduction on Schedule 1 line 15, overpaying income tax by 10% to 37% of the missed deduction
• Missing quarterly estimated tax payments under Form 1040-ES, triggering the §6654 underpayment penalty currently running near 8% annualized
• Mixing personal and business bank accounts, which destroys the audit trail and risks the entire Schedule C being disallowed
• Claiming hobby losses as business losses, violating IRC §183 and triggering hobby-loss reclassification with disallowed deductions
• Taking the home office deduction without meeting the exclusive-use test in §280A, which the IRS can deny on audit
• Treating 1099-K income from PayPal or Venmo as non-taxable, even though the $5,000 2024 threshold and $2,500 for 2025 require reporting
• Forgetting to file Form 8959 when combined W-2 and SE earnings cross $200,000 single or $250,000 MFJ
• Deducting commuting miles as business miles, which is always disallowed under Treasury Regulation 1.162-2
• Ignoring state-level self-employment rules like California’s $800 LLC annual tax or NYC Unincorporated Business Tax at 4%

Deductions That Lower Schedule C Profit and SE Tax

Every legitimate business deduction on Schedule C reduces both your income tax and your SE tax, which makes Schedule C deductions doubly valuable. Under IRC §162, ordinary and necessary business expenses are deductible against gross business income. The plain-English meaning is that expenses common in your line of work and helpful to your business qualify.

The consequence of missing a deduction is a 15.3% SE tax hit plus a 10% to 37% income tax hit on the same dollar. A common misconception is that only big-ticket items like equipment count, but office supplies, software subscriptions, business insurance, and client meals at 50% all qualify. IRS Publication 535 and its successor guidance list every category.

Retirement Contributions

A SEP-IRA or Solo 401(k) lets self-employed people shelter huge amounts of income, though these do not reduce SE tax. SEP-IRA contributions cap at 25% of net SE earnings or $70,000 for 2025, whichever is lower. Solo 401(k) plans allow employee deferrals of $23,500 plus employer contributions, totaling up to $70,000.

The consequence of skipping retirement contributions is losing a massive income tax deduction and missing tax-deferred growth. A common misconception is that these reduce SE tax, but SEP and Solo 401(k) contributions are above-the-line deductions only. For example, Priya contributes $5,000 to a SEP-IRA and saves about $1,100 in income tax at the 22% bracket, while her SE tax stays the same.

Health Insurance Premiums

Under IRC §162(l), self-employed people can deduct health insurance premiums for themselves, spouses, and dependents as an above-the-line deduction. The deduction only applies if no employer-subsidized plan was available, and it does not reduce SE tax per the IRS’s Chief Counsel Advice 200524001. The plain-English takeaway is that premiums are income tax deductible but still subject to SE tax.

The consequence of paying premiums through a non-deductible channel is overpaying income tax. A common misconception is that a spouse’s employer plan offer disqualifies the deduction even if declined, but that is exactly when disqualification happens. For example, James pays $8,000 in premiums and deducts the full amount on Schedule 1, saving $1,760 at the 22% bracket.

S-Corp Election as SE Tax Strategy

Electing S-Corp status under IRC §1362 splits your business income into wages and distributions, and only the wage portion gets hit with FICA. This is the single most powerful legal way to reduce self-employment tax for profitable Schedule C filers. The election is made on Form 2553 within 2 months and 15 days of the tax year start.

The consequence of making a sloppy election is loss of S-Corp status and reversion to Schedule C treatment with full SE tax. A common misconception is that any LLC automatically qualifies, but only LLCs that elect corporate status via Form 8832 first or make the election directly via Form 2553 with certain assumed approvals qualify. Rev. Proc. 2013-30 provides relief for late elections.

Tax Item	Schedule C	S-Corp
SE tax on profit	15.3% on 92.35% of net profit	0% on distributions
FICA on wages	N/A	15.3% on reasonable salary
Payroll reporting	None	Quarterly 941, annual W-2
State fees	Varies	Often higher (CA $800 min)
Audit risk for compensation	Low	Elevated — reasonable comp rule
Retirement plan flexibility	SEP-IRA, Solo 401(k)	Solo 401(k) based on W-2 wages

Reasonable Compensation Rule

The IRS Fact Sheet 2008-25 lists nine factors for reasonable compensation, including training, experience, duties, time devoted, and comparable salaries. The rule exists to prevent the Watson-style abuse of taking all profit as distributions. The plain-English test is: what would you pay someone else to do your job?

The consequence of lowballing your salary is exactly the Watson outcome — back FICA, penalties, and interest. A common misconception is that 60/40 or 50/50 splits are safe harbors, but the IRS has no official safe harbor. For example, consultant Amy nets $200,000 from her S-Corp and pays herself $100,000 as W-2 wages based on industry salary data, while taking $100,000 as distributions that skip FICA.

State-Level Nuances

While SE tax itself is federal, states layer their own rules on top that can significantly affect the net cost of self-employment. California charges an $800 annual LLC tax plus a gross receipts fee on higher earners. New York City imposes a 4% Unincorporated Business Tax on sole proprietors and partnerships operating in the city.

State	Extra Self-Employment Cost
California	$800 LLC tax + gross receipts fee
New York (NYC)	4% UBT on sole props over $95,000
Texas	No income tax, but franchise tax over $2.47M
Tennessee	No state income tax (Hall tax repealed 2021)
Washington	B&O tax on gross receipts, not profit

The consequence of ignoring state rules is penalties from the state department of revenue on top of federal penalties. A common misconception is that a home state with no income tax, like Texas or Tennessee, means no state-level self-employment cost, but franchise, B&O, and LLC taxes still apply. For example, NYC freelancer Lisa owes federal SE tax plus NYC UBT at 4% on her net business profit above the $95,000 threshold.

Do’s and Don’ts for Schedule C Filers

Do’s

• Do keep separate business bank and credit card accounts to preserve the audit trail and avoid commingling
• Do make quarterly estimated tax payments via Form 1040-ES to avoid §6654 penalties running around 8%
• Do track mileage contemporaneously with an app, because the IRS rejects reconstructed logs under Cohan v. Commissioner limits
• Do file Schedule SE whenever net SE earnings reach $400, even if no income tax is owed due to deductions
• Do keep receipts for at least 3 years, or 6 years if gross income was underreported by 25% or more per §6501(e)

Don’ts

• Don’t treat 1099-K income as gifts or reimbursements if the activity is a trade or business
• Don’t skip the half-SE-tax deduction on Schedule 1 line 15, because it saves real income tax dollars
• Don’t take a home office deduction without meeting the exclusive and regular use test in §280A
• Don’t file Schedule C for passive rental real estate, which belongs on Schedule E under §1402(a)(1)
• Don’t elect S-Corp status without running the math on payroll costs, state fees, and reasonable compensation

Pros and Cons of Schedule C Filing

Pros

• Pros include simple one-page form compared to corporate returns, no separate business tax return required
• Pros include full access to §199A QBI deduction up to 20% for income tax purposes
• Pros include flexible retirement options like SEP-IRA and Solo 401(k) with high contribution limits
• Pros include ability to deduct home office, business mileage, and health insurance premiums above the line
• Pros include losses that offset other income under §172 net operating loss rules

Cons

• Cons include full 15.3% SE tax on all net profit up to the wage base, no split with an employer
• Cons include higher audit rates than W-2 only filers per IRS Data Book 2024
• Cons include quarterly estimated tax burden with penalties under §6654 for underpayment
• Cons include no employer-provided benefits like health insurance, 401(k) match, or paid time off
• Cons include Schedule C losses capped by the excess business loss rule under IRC §461(l) at $313,000 single or $626,000 MFJ for 2025

Key Entities and Forms to Know

The Schedule C and SE tax ecosystem involves several agencies, forms, and statutes that each play a specific role. The Internal Revenue Service administers the tax, processes returns, and audits filers. The Social Security Administration credits SE tax payments to your earnings record for retirement and disability benefits.

Key forms include Schedule C for reporting business profit, Schedule SE for calculating SE tax, Form 1040-ES for quarterly estimates, Form 8959 for the Additional Medicare Tax, and Form 4361 for clergy SE tax exemption. Key statutes include IRC §1401 imposing the tax, §1402 defining net earnings, §162 allowing business deductions, §164(f) providing the half-SE-tax deduction, and §199A providing the QBI deduction. The consequence of ignoring any one of these forms or statutes can be thousands in penalties, lost deductions, or audit adjustments.

FAQs

Does every Schedule C filer owe self-employment tax?

No. Only Schedule C filers with net earnings of $400 or more owe SE tax. Filers below the threshold still report income for regular income tax but skip Schedule SE entirely.

Can I deduct my self-employment tax?

Yes. You deduct half of your SE tax as an above-the-line adjustment on Schedule 1 line 15 under IRC §164(f). This reduces income tax only, not SE tax itself.

Does a single-member LLC pay SE tax on Schedule C income?

Yes. Single-member LLCs are disregarded entities by default under Treasury Reg. 301.7701-3, so profits flow to Schedule C and full SE tax applies to net earnings above $400.

Does S-Corp income get hit with SE tax?

No. S-Corp distributions skip SE tax entirely, but the owner must pay reasonable W-2 wages subject to FICA. Watson v. Commissioner enforces this split.

Does rental income on Schedule C owe SE tax?

No. Rental real estate income belongs on Schedule E, not Schedule C, and is exempt from SE tax under IRC §1402(a)(1) unless you qualify as a real estate dealer.

Is 1099-K income from Venmo or PayPal subject to SE tax?

Yes. If the 1099-K reports business income, it flows to Schedule C and owes SE tax above $400. Personal reimbursements for splitting dinners do not count.

Does a hobby pay SE tax?

No. Hobbies are not trades or businesses under IRC §183, so hobby income goes on Schedule 1 line 8j and owes no SE tax. Hobby expenses are no longer deductible post-2017 TCJA.

Can I avoid SE tax by paying myself as an independent contractor from my own LLC?

No. A single-member LLC cannot pay its owner as a contractor. All net profit is subject to SE tax unless the LLC elects S-Corp or C-Corp status.

Does the QBI deduction reduce SE tax?

No. The §199A QBI deduction reduces income tax only, not SE tax. SE tax is calculated on Schedule SE before the QBI deduction applies on Form 1040.

Are retirement contributions deductible against SE tax?

No. SEP-IRA and Solo 401(k) contributions reduce income tax only. SE tax is calculated on Schedule C profit before any retirement plan deductions.

Do clergy owe SE tax on housing allowance?

Yes. Housing allowance is excluded from income tax but included in SE earnings under IRC §1402(a)(8), unless the minister filed Form 4361 and was approved.

Does SE tax apply to Schedule C losses?

No. A Schedule C net loss produces zero SE tax, and you cannot get a refund of SE tax from prior years. Net operating losses may offset other income for income tax.

Do statutory employees owe SE tax?

No. Statutory employees file Schedule C for expenses but receive a W-2 with FICA already withheld, so no SE tax applies per IRC §3121(d)(3).

Does the Additional Medicare Tax apply to Schedule C income?

Yes. Combined W-2 wages and SE earnings above $200,000 single or $250,000 MFJ trigger the 0.9% surtax reported on Form 8959.

Can spouses split Schedule C income to reduce SE tax?

Yes. A qualified joint venture election under IRC §761(f) lets spouses split income on two Schedule Cs, which can optimize Social Security credits though not reduce total SE tax.