North Carolina Form D-400 Schedule S is the N.C. Adjustments for Individuals schedule that every individual taxpayer must attach to Form D-400 when their North Carolina taxable income differs from federal adjusted gross income because of state-specific add-backs, deductions, or part-year and nonresident allocations. The schedule turns a federal AGI number into a North Carolina–specific income figure, and skipping it when required can cause a notice, a refund hold, or a math-error adjustment from the North Carolina Department of Revenue (NCDOR).
Schedule S exists because North Carolina decouples from several parts of the Internal Revenue Code, including bonus depreciation under IRC §168(k) and certain federal exclusions. According to NCDOR’s annual statistics, more than 4.7 million individual returns are filed in North Carolina each year, and a sizeable share of those returns include a Schedule S because of retirement income, 529 contributions, or part-year residency.
Here is what you will learn in this guide:
- 📋 What every line on D-400 Schedule S asks and how to answer it
- 🧾 Which federal forms and 1099s to gather before you start
- 👨👩👧 Three fully worked scenarios from real filer profiles
- ⚖️ The statutes, including the Bailey v. State settlement, that drive each adjustment
- 🚫 The most common mistakes filers make and how to avoid them
What the Form Is and Who Must File It
North Carolina Form D-400 Schedule S is the official Supplemental Schedule to the state’s individual income tax return, Form D-400. The schedule is divided into four parts: Part A for additions to federal AGI, Part B for deductions from federal AGI, Part C for adjustments by part-year residents and nonresidents, and Part D for North Carolina itemized deductions. The 2025 revision date appears in the bottom left corner of the official PDF, so confirm you are using the form printed 2025 D-400 Schedule S Web 9-25 before you begin.
You must file Schedule S if any of the following apply: you had bonus depreciation or Section 179 add-backs, you received Bailey-qualifying retirement income, you contributed to an NC 529 plan, you were a part-year resident or nonresident, or you plan to itemize on the North Carolina return rather than take the standard deduction. Filers who only take the standard deduction and have no add-backs or deductions can skip the schedule.
The legal authority for the schedule sits in N.C. General Statutes §105-153.5 and §105-153.6. The agency that receives the form is NCDOR, and the deadline tracks the federal individual income tax deadline of April 15, 2026 for the 2025 tax year. Missing the deadline triggers a 5% per month late-filing penalty plus a 10% late-payment penalty under G.S. §105-236, with interest accruing daily.
Before You Start: Documents and Information You Need
Gather every supporting document before you open Schedule S. Missing one piece can force you to stop, refile, or amend later with Form D-400X. The pre-filing checklist below covers the items most filers need.
- Federal Form 1040 and all schedules. Schedule S starts with federal AGI from Line 11 of Form 1040, so a finished federal return must come first. Without it, every line on Schedule S becomes a guess.
- All 1099-R forms. Retirees need every 1099-R to identify Bailey-qualifying amounts in Box 1 and Box 2a. Without 1099-Rs, you cannot prove the retirement system was vested before August 12, 1989.
- NC 529 contribution records. Pull your year-end statement from the NC 529 Plan. The deduction is capped, and the statement is your only evidence in an audit.
- Federal Schedule A. Needed if you plan to use Part D for North Carolina itemized deductions. Schedule A drives mortgage interest and charitable contribution amounts.
- Federal depreciation schedules (Form 4562). Form 4562 is required to compute the bonus depreciation and §179 add-backs on Part A.
- W-2s for every employer. Part-year residents need W-2 Box 15 state codes to allocate wages between North Carolina and other states.
- Prior-year D-400 Schedule S. Past add-backs create future deductions over five years, so last year’s Schedule S tells you what to put on Part B Line 17.
- Closing statements for any home sale. Needed to confirm capital gains amounts that may flow into Part B for certain gain exclusions.
Where to Get the Form and How to Access It
The official 2025 PDF lives on the NCDOR forms library. Download the fillable version, not a screenshot, because the fillable PDF carries embedded math fields that prevent simple addition errors. The agency also publishes line-by-line instructions inside the 2025 D-401 Individual Income Tax Instructions, which is the booklet every preparer should keep open while filling out Schedule S.
If you e-file, the schedule is generated automatically inside approved software listed on the NCDOR eFile page. The software prompts you for each Schedule S input, then attaches the completed schedule to the D-400 transmission. If you paper file, print Schedule S on plain white 8.5 x 11 paper, single-sided, with no staples, because NCDOR scanners reject double-sided pages.
You can also pick up paper copies at any NCDOR Service Center, but supplies run thin near the April deadline. Order by mail through the agency’s forms request line if you need a clean copy mailed to your home. Confirm the revision date in the bottom corner reads 9-25 before you begin.
Step-by-Step: How to Fill Out D-400 Schedule S Line by Line
The schedule is organized into four parts. Walk through each part in order, and copy the totals to the matching lines on the front of Form D-400.
Top-of-Form: Name and Social Security Number
The header asks for your name(s) as shown on Form D-400 and your Social Security Number. Print your full legal name exactly as it appears on your Social Security card, and enter the nine-digit SSN with no dashes in the boxed fields. For example, Carlos Ramirez writes his name on the top line and 123-45-6789 in the SSN boxes.
How to answer it: copy the names and SSNs straight from the top of the D-400 to keep the two forms aligned. If filing jointly, list the primary filer first on both forms in the same order.
A specific example: Carlos Ramirez and Maria Ramirez file jointly, and Carlos’s SSN goes in the first SSN box because he is listed first on the D-400.
A nuance: if a spouse died during 2025, still write both names but mark Deceased and the date of death next to that spouse’s name to match the D-400 entry.
A common mistake: swapping the order of names between the D-400 and Schedule S, which causes NCDOR’s scanner to flag a name mismatch and delay the refund 6 to 10 weeks.
A misconception: filers think only one spouse’s SSN is needed on a joint return. Both SSNs must appear on Schedule S or the schedule is treated as unsigned.
Part A, Line 1: Interest Income from Obligations of States Other Than North Carolina
This line asks for interest income earned on bonds and obligations issued by states other than North Carolina that was excluded from federal taxable income. North Carolina taxes that interest even though the IRS does not.
How to answer it: pull tax-exempt interest from Line 2a of your federal 1040, then subtract any portion that came from North Carolina or U.S. obligations. Enter the remainder.
A specific example: Janet Pierce earned $1,200 of tax-exempt interest, $800 of which came from a Georgia municipal bond, so she enters 800 on Line 1.
A nuance: interest from U.S. Treasury bonds and U.S. territories like Puerto Rico is not added back here, even though it appears on Line 2a.
A common mistake: adding the entire federal Line 2a amount without subtracting the North Carolina portion, which inflates state taxable income and overpays tax.
A misconception: filers think mutual fund tax-exempt distributions are exempt from this rule. They are not; the fund’s annual statement breaks out the state-by-state percentages, and you must add back every non-NC portion.
Part A, Line 2: Deferred Gains Reinvested into an Opportunity Fund
This line captures federal Qualified Opportunity Fund deferrals under IRC §1400Z-2 that North Carolina does not allow.
How to answer it: enter the gain you deferred on the federal return for the 2025 tax year. Pull the amount from federal Form 8997.
A specific example: Marcus Hill deferred $25,000 of capital gain into a QOF in 2025 and writes 25,000 on Line 2.
A nuance: the add-back applies only in the year of deferral. When you eventually recognize the gain federally, North Carolina gives a corresponding deduction.
A common mistake: forgetting to track the basis difference between federal and state, which causes double taxation when the QOF is sold.
A misconception: many filers believe the federal QOF election automatically applies to North Carolina. North Carolina decoupled from §1400Z-2, so the deferral is added back here every time.
Part A, Line 3: Bonus Depreciation Add-Back
This line asks for 85% of the federal bonus depreciation taken under IRC §168(k) on assets placed in service in 2025.
How to answer it: pull the bonus depreciation amount from Form 4562, multiply by 0.85, and enter the result. The remaining 15% stays as a current-year North Carolina deduction.
A specific example: Marcus Hill claimed $10,000 of bonus depreciation on a new commercial oven, so he enters 8,500 on Line 3.
A nuance: the 85% added back is recovered evenly over the next five tax years through Part B Line 17. Keep a worksheet or you will lose the future deduction.
A common mistake: adding back 100% instead of 85%, which permanently overstates state taxable income because the future deduction is keyed to the 85% figure.
A misconception: filers think the add-back disappears if they sell the asset. It does not; the unrecovered add-back continues to amortize over the original five-year window.
Part A, Line 4: IRC Section 179 Expense Add-Back
This line covers the §179 expensing add-back when the federal §179 deduction exceeds North Carolina’s $25,000 cap with a $200,000 investment ceiling.
How to answer it: subtract the North Carolina cap from the federal §179 deduction, multiply the excess by 0.85, and enter the result.
A specific example: Marcus Hill expensed $50,000 of equipment under federal §179. The excess over the $25,000 NC cap is $25,000, and 85% of that is 21,250, which goes on Line 4.
A nuance: the cap is per taxpayer, not per business, so two Schedule C businesses share one $25,000 limit on the North Carolina side.
A common mistake: applying the federal $1,160,000 §179 cap to North Carolina, which understates the add-back and triggers an NCDOR adjustment.
A misconception: filers assume §179 and bonus depreciation rules are identical. They are not; §179 has a different cap and a different recovery schedule.
Part A, Line 5: Other Additions to Federal AGI
This catch-all line covers items like withdrawals from a North Carolina 529 plan used for non-qualified expenses, certain net operating loss differences, and federal deductions disallowed by North Carolina.
How to answer it: list each item on the Other Additions worksheet in the D-401 instructions and total the worksheet to Line 5.
A specific example: Aisha Bennett withdrew $3,000 from her NC 529 to pay for a non-qualified expense and enters 3,000 on Line 5.
A nuance: a non-qualified 529 withdrawal is an add-back only to the extent of prior North Carolina deductions, not the entire withdrawal.
A common mistake: lumping bonus depreciation here instead of Line 3, which can double-count the add-back if NCDOR catches the duplication.
A misconception: filers think Line 5 needs no documentation. It does; attach the worksheet to a paper return or store it for an e-filed return in case of audit.
Part A, Line 6: Total Additions
Add Lines 1 through 5 and enter the total on Line 6. Then carry this number to Line 7 of Form D-400.
How to answer it: simple math; double check by re-adding from bottom to top.
A specific example: Marcus Hill totals $0 + $0 + $8,500 + $21,250 + $0 = 29,750.
A nuance: if Line 6 is zero, still carry zero to D-400; do not leave the field blank because scanners read blank as missing data.
A common mistake: forgetting to copy Line 6 to D-400 Line 7, which understates state income and triggers a notice.
A misconception: filers think the schedule auto-flows to D-400. Only inside e-file software does it auto-flow; paper filers must copy by hand.
Part B, Line 7: Interest from U.S. Government Obligations
This line deducts interest on U.S. Treasury bills, bonds, and notes that is included in federal AGI but exempt from state tax under 31 U.S.C. §3124.
How to answer it: take the total Treasury interest from your 1099-INT Box 3 and enter it on Line 7.
A specific example: Janet Pierce received $400 of U.S. Treasury interest and writes 400 on Line 7.
A nuance: Ginnie Mae and Fannie Mae interest does not qualify; only direct U.S. obligations do.
A common mistake: deducting all 1099-INT interest instead of only Box 3, which understates state tax and creates a refund clawback.
A misconception: filers think savings bond interest never qualifies. EE and I bond interest does qualify when reported federally.
Part B, Line 8: Taxable Portion of Social Security and Railroad Retirement
This line deducts the taxable portion of Social Security benefits from federal Line 6b and any taxable Railroad Retirement Tier 1 and Tier 2 benefits.
How to answer it: copy the federal taxable Social Security amount, add taxable Railroad Retirement, and enter the total.
A specific example: Janet Pierce had $14,000 of taxable Social Security and writes 14,000 on Line 8.
A nuance: Tier 2 Railroad Retirement is also fully deductible here under 4 U.S.C. §114.
A common mistake: copying the gross benefit from SSA-1099 Box 5 instead of the federal taxable portion, which overstates the deduction and creates an NCDOR adjustment.
A misconception: filers think Social Security is never taxable in North Carolina. The deduction is automatic only if you actually had a federally taxable portion to begin with.
Part B, Line 9: Bailey Settlement Retirement Benefits
This line deducts qualifying retirement benefits protected by Bailey v. State of North Carolina, the 1998 ruling that exempted retirement income from certain government plans for vested members on or before August 12, 1989.
How to answer it: total all 1099-R amounts from qualifying systems (TSERS, LGERS, CSRS, federal military retirement, and others listed in the D-401 booklet) and enter on Line 9.
A specific example: Janet Pierce receives $32,000 from TSERS and was vested in 1985, so she writes 32,000 on Line 9.
A nuance: the five-year vesting test is the gate. If you were not vested by August 12, 1989, none of the income qualifies even if the system is on the list.
A common mistake: claiming Bailey on a 401(k) or IRA, which never qualifies under the settlement and triggers a denial letter.
A misconception: surviving spouses think Bailey dies with the retiree. It does not; a survivor benefit from a Bailey-qualifying plan keeps its exempt status.
Part B, Line 10: Other Retirement Benefits Deduction
For 2025, North Carolina does not offer a general retirement deduction beyond Bailey, so most filers leave this blank. Use it only for items the D-401 instructions specifically list, such as certain uniformed-services retirement under G.S. §105-153.5(b)(5a) for taxpayers with 20+ years of qualifying service.
How to answer it: confirm eligibility against the instructions and enter the deductible amount.
A specific example: Sgt. Tom Whitfield served 22 years and writes 18,000 of military pension on Line 10.
A nuance: the military deduction is unlimited for qualifying retirees but does not apply to Survivor Benefit Plan annuities paid to beneficiaries.
A common mistake: claiming this line for civilian federal pensions that are not Bailey-protected, which results in denial.
A misconception: filers think any military retirement qualifies. Only retirees with 20 or more years of creditable service or a medical retirement qualify.
Part B, Line 11: Section 179 Recovery from Prior Years
This line recovers 20% of prior-year §179 add-backs taken on Part A Line 4 in any of the previous five tax years.
How to answer it: pull the five-year worksheet from your prior-year Schedule S and total this year’s 20% slices.
A specific example: Marcus Hill added back $20,000 of §179 in 2021, so he writes 4,000 on Line 11 for 2025, the final installment.
A nuance: the recovery is fixed in dollars; do not adjust it for asset disposition.
A common mistake: forgetting the worksheet and missing a deduction year, which permanently loses the deduction unless you amend within three years.
A misconception: filers think the recovery starts in the same year as the add-back. It starts the year after the add-back.
Part B, Line 12: Bonus Depreciation Recovery from Prior Years
Same mechanic as Line 11, but for bonus depreciation. Enter 20% of each prior-year add-back still inside the five-year window.
How to answer it: total the slice from each prior year on the running worksheet.
A specific example: Marcus Hill recovers 1,700 this year from his 2021 bonus depreciation add-back of $8,500.
A nuance: a sale of the asset does not accelerate recovery; the schedule continues unchanged.
A common mistake: combining §179 and bonus depreciation recoveries on a single line, which causes confusion if NCDOR audits the schedule.
A misconception: filers think they can take 100% in one year by election. They cannot.
Part B, Line 13: Contributions to North Carolina 529 Plan
This line is currently reserved in tax year 2025 for the historic 529 deduction; check the D-401 instructions carefully because the deduction was repealed for individual filers in 2014. If a successor deduction is reinstated, this is where it would go.
How to answer it: leave blank unless current-year instructions list a value.
A specific example: Aisha Bennett contributed $2,000 to her son’s NC 529 in 2025 but writes 0 on Line 13 because no individual deduction is available.
A nuance: the federal benefit (tax-free growth) still applies even though the state deduction does not.
A common mistake: claiming a 529 deduction here, which NCDOR will deny in processing.
A misconception: filers confuse North Carolina with states like Virginia or New York, which still offer a 529 deduction.
Part B, Line 14: Other Deductions from Federal AGI
This catch-all line covers items like the federal disaster relief payments included in AGI but excluded by North Carolina, certain qualifying recovery amounts, and other items in the Other Deductions worksheet of the D-401 booklet.
How to answer it: itemize on the worksheet and total to Line 14.
A specific example: Aisha Bennett received $500 of federally taxed disaster relief and writes 500 on Line 14.
A nuance: each item must trace to a statutory authority, not a general fairness argument.
A common mistake: using Line 14 for items that already flow from another line, which double counts.
A misconception: filers think Line 14 is open-ended. It is not; only items listed in the instructions qualify.
Part B, Line 15: Total Deductions
Add Lines 7 through 14 and carry the result to Line 9 of Form D-400.
How to answer it: re-add from top to bottom and bottom to top to confirm.
A specific example: Janet Pierce totals $400 + $14,000 + $32,000 = 46,400.
A nuance: round each line to the nearest dollar; do not enter cents.
A common mistake: leaving the line blank when it should be zero, which the scanner reads as missing.
A misconception: filers think a large Line 15 always means a refund. It only matters after the full D-400 calculation.
Part C: Adjustments for Part-Year Residents and Nonresidents
Part C applies to anyone who lived in North Carolina for less than the full year or earned income from North Carolina sources without being a resident. The section asks for column A (federal amounts) and column B (North Carolina amounts) across wages, interest, dividends, business income, capital gains, IRA distributions, pensions, rental income, and other income.
How to answer it: enter the federal amounts in column A from your 1040 line by line. Then enter only the North Carolina-sourced or North Carolina-period portion in column B.
A specific example: David Chen moved from Ohio to North Carolina on July 1, 2025, and earned $80,000 total. He writes 80,000 in column A wages and 40,000 in column B because half of his wages were earned while a North Carolina resident.
A nuance: military spouses protected by the Servicemembers Civil Relief Act may exclude wages from column B even when physically present in North Carolina.
A common mistake: allocating capital gains by residency days when the gain was actually triggered on a single date during a single state’s residency period. The correct approach is sourcing by the date of sale.
A misconception: filers think nonresidents skip Part C entirely. They do not; nonresidents still file column A and column B if they had North Carolina source income.
The Line 24 percentage divides column B by column A and produces the prorated decimal that drives the part-year/nonresident tax calculation on Form D-400 Line 13. Round to four decimal places, never higher.
Part D: North Carolina Itemized Deductions
Use Part D only if itemizing produces a larger deduction than the 2025 North Carolina standard deduction of $12,750 single, $25,500 married filing jointly, $19,125 head of household, $12,750 married filing separately, listed in the 2025 D-401 booklet.
Part D, Line 16: Qualifying Mortgage Interest
Enter qualifying home mortgage interest from federal Schedule A, but the combined cap on this line plus property taxes is $20,000 for all filing statuses except married filing separately, which gets $10,000.
How to answer it: copy mortgage interest from Schedule A Line 8a, then plan how it stacks against property tax to stay under $20,000.
A specific example: Janet Pierce paid $14,000 in mortgage interest and writes 14,000 on Line 16.
A nuance: home equity loan interest qualifies only if used to buy, build, or improve the home, matching federal rules.
A common mistake: ignoring the $20,000 combined cap and entering the full federal amount, which NCDOR caps automatically and triggers a math-error notice.
A misconception: filers think second-home interest is deductible. North Carolina follows federal rules limiting the deduction to one principal and one second home.
Part D, Line 17: Real Estate Property Taxes
Enter qualifying property taxes paid in 2025, subject to the same combined $20,000 cap.
How to answer it: pull property tax paid from Schedule A Line 5b and combine with Line 16.
A specific example: Janet Pierce paid $4,200 in property taxes and writes 4,200. Her combined Line 16 and Line 17 is $18,200, under the cap.
A nuance: tax paid on a vehicle, even though included in federal Schedule A as personal property tax, is not deductible here.
A common mistake: including state income tax paid; that is never deductible on Part D.
A misconception: filers think the cap is per property. It is per return.
Part D, Line 18: Charitable Contributions
Enter the federal Schedule A charitable contribution amount with no North Carolina cap beyond the federal AGI percentages.
How to answer it: copy Schedule A Line 14 directly.
A specific example: Janet Pierce gave $5,000 to her church and writes 5,000 on Line 18.
A nuance: noncash contributions over $500 still need federal Form 8283.
A common mistake: claiming volunteer hours as a contribution; only out-of-pocket expenses count.
A misconception: filers think North Carolina disallows large gifts. It follows the federal AGI ceilings.
Part D, Line 19: Medical and Dental Expenses
Enter medical expenses above the federal 7.5% of AGI floor, identical to the federal calculation.
How to answer it: copy the deductible amount from Schedule A Line 4.
A specific example: Janet Pierce deducted $3,000 of medical expenses federally and writes 3,000.
A nuance: long-term care insurance premiums qualify within age-based federal limits.
A common mistake: deducting cosmetic procedures, which never qualify.
A misconception: filers think the 7.5% floor only applies to seniors. It applies to all filers.
Part D, Line 20: Repayment of Claim of Right Income
Use this line for repayments under IRC §1341 over $3,000.
How to answer it: enter the qualifying repayment amount.
A specific example: Marcus Hill repaid $5,000 of prior-year bonus and writes 5,000.
A nuance: a corresponding federal credit option does not flow to North Carolina; only the deduction does.
A common mistake: using this line for ordinary refunds rather than true claim-of-right repayments.
A misconception: filers think any repayment qualifies. Only amounts taxed in a prior year qualify.
Part D, Line 21: Total NC Itemized Deductions
Add Lines 16 through 20 and carry to Line 11 of Form D-400 if itemizing.
How to answer it: sum, round, and copy.
A specific example: Janet Pierce totals 26,200.
A nuance: compare against the standard deduction before committing to itemize.
A common mistake: itemizing when the standard would be larger, which costs real tax.
A misconception: filers must itemize federally to itemize here. North Carolina allows the choice independently.
Three Filled-Out Examples Using Real Scenarios
Scenario 1: Janet Pierce, Retired Teacher with Bailey Income
| Form Section | What Janet Enters |
|---|---|
| Name and SSN | Janet Pierce, 222-33-4444 |
| Part A Line 1 (Other state interest) | 800 |
| Part A Line 6 (Total additions) | 800 |
| Part B Line 7 (US obligations) | 400 |
| Part B Line 8 (Social Security) | 14,000 |
| Part B Line 9 (Bailey TSERS) | 32,000 |
| Part B Line 15 (Total deductions) | 46,400 |
| Part D Line 16 (Mortgage interest) | 14,000 |
| Part D Line 17 (Property tax) | 4,200 |
| Part D Line 21 (Total itemized) | 26,200 |
Scenario 2: David Chen, Part-Year Resident Who Moved Mid-Year
| Form Section | What David Enters |
|---|---|
| Name and SSN | David Chen, 333-44-5555 |
| Part A Line 6 (Total additions) | 0 |
| Part B Line 7 (US obligations) | 150 |
| Part B Line 15 (Total deductions) | 150 |
| Part C Wages Column A | 80,000 |
| Part C Wages Column B | 40,000 |
| Part C Interest Column A | 600 |
| Part C Interest Column B | 300 |
| Part C Line 24 (NC percentage) | 0.5000 |
| Standard deduction | 12,750 |
Scenario 3: Marcus Hill, Small Business Owner with Depreciation
| Form Section | What Marcus Enters |
|---|---|
| Name and SSN | Marcus Hill, 444-55-6666 |
| Part A Line 3 (Bonus depreciation 85%) | 8,500 |
| Part A Line 4 (Sec 179 85%) | 21,250 |
| Part A Line 6 (Total additions) | 29,750 |
| Part B Line 11 (Sec 179 recovery) | 4,000 |
| Part B Line 12 (Bonus recovery) | 1,700 |
| Part B Line 15 (Total deductions) | 5,700 |
| Part D Line 20 (Claim of right) | 5,000 |
| Part D Line 21 (Total itemized) | 5,000 |
How to File the Completed Form
You can file Schedule S three ways: electronically through approved software, by mail, or in person at a service center. Each channel has its own quirks.
Online via approved software. Use any vendor listed on the NCDOR eFile page. The software attaches Schedule S to the D-400 transmission automatically. There is no NCDOR fee, though the vendor may charge $25 to $50. Processing time runs about 6 to 8 weeks for refunds, and the software’s confirmation email is your proof of filing.
By mail with a refund or no payment. Send the D-400, Schedule S, and any supporting schedules to NC Department of Revenue, P.O. Box R, Raleigh, NC 27634-0001. There is no filing fee. Processing time stretches to 10 to 12 weeks. Use USPS Certified Mail with Return Receipt as your proof of filing.
By mail with a balance due. Send to NC Department of Revenue, P.O. Box 25000, Raleigh, NC 27640-0640 with a check or money order payable to N.C. Department of Revenue. Write your SSN and 2025 D-400 on the check. The agency also accepts payment through NCDOR’s online payment portal. Processing time mirrors the refund mailbox.
In person at a service center. Bring two paper copies and a photo ID to any NCDOR Service Center. The receptionist date-stamps both copies and returns one to you. There is no filing fee. Walk-ins are accepted but appointments shorten the wait.
What Happens After You File
NCDOR pulls Schedule S into the D-400 processing flow and matches each add-back and deduction against IRS data. Refunds typically issue 6 to 8 weeks after e-file or 10 to 12 weeks after paper filing, and you can track yours through the NCDOR Where’s My Refund tool.
If the agency disagrees with a Schedule S entry, you receive a Notice of Individual Income Tax Adjustment with a 45-day window to respond. Most disputes start with a missing 1099-R for Bailey or a math error on Part A. You can resolve the issue by mail, fax, or through the NCDOR online services portal.
If you owe additional tax, interest accrues from April 15, 2026 at the rate set semi-annually under G.S. §105-241.21. If a refund is short, request a written explanation and compare against your worksheets. Always keep Schedule S, supporting 1099s, and depreciation worksheets for at least three years from the filing date, longer if claiming Bailey or carryforward depreciation.
Mistakes to Avoid When Filling Out the Form
- Skipping Schedule S when bonus depreciation applies. The agency cross-checks Form 4562, and a missing add-back generates an automatic adjustment.
- Adding back 100% of bonus depreciation. The correct add-back is 85%; entering more overpays state tax.
- Claiming Bailey on a 401(k). Only listed government plans qualify, and the claim will be denied.
- Forgetting the five-year recovery. Failing to claim 20% recovery on Lines 11 and 12 permanently loses the deduction.
- Mixing up Column A and Column B in Part C. Reversing them inverts your tax and triggers a notice.
- Itemizing without checking the standard deduction. Many filers itemize $13,000 when the standard would have been $12,750 plus simpler.
- Including vehicle property tax on Line 17. Real estate tax only; vehicle tax is excluded.
- Deducting state income tax on Part D. Never allowed.
- Missing the $20,000 combined mortgage and property tax cap. Triggers an automatic recalculation.
- Leaving total lines blank instead of zero. Scanners read blank as missing data and stall processing.
- Stapling pages. NCDOR scanners reject stapled returns and reroute them to manual processing.
- Filing the prior-year revision. Always confirm the 9-25 revision date on a 2025 return.
Do’s and Don’ts
- Do confirm the form revision date in the bottom corner before printing, because NCDOR rejects prior-year forms.
- Do keep a five-year worksheet for §179 and bonus depreciation, because the recovery is your only path to a state deduction.
- Do attach all 1099-Rs to a paper return when claiming Bailey, because the agency uses them to verify vesting.
- Do round every entry to whole dollars, because cents create scanner mismatches.
- Do sign and date the D-400 itself, because Schedule S has no signature line and stands or falls with the parent return.
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Do file electronically when possible, because e-filing cuts refund time roughly in half.
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Don’t claim a 529 deduction in 2025, because North Carolina repealed the individual deduction for that contribution.
- Don’t treat federal QOF deferrals as state deferrals, because North Carolina decoupled from §1400Z-2.
- Don’t allocate income in Part C by residency days alone, because some items (like a one-time capital gain) source by the transaction date.
- Don’t itemize without comparing to the $12,750 / $25,500 standard, because itemizing for $13,000 wastes effort.
- Don’t mail the return without a tracking number, because lost mail without proof leaves you exposed to late penalties.
- Don’t assume your software computes Schedule S correctly without reviewing it, because vendor errors with depreciation are common.
Pros and Cons of Filing on Your Own vs. With Help
Pros of filing on your own – Saves the $200–$500 average preparer fee for a simple return. – Forces a deeper understanding of North Carolina’s add-backs and deductions. – Lets you control the timing of e-file submission and payment. – Avoids sharing sensitive 1099 data with a third party. – Builds a clean paper trail you understand year over year.
Cons of filing on your own – Easy to miss the §179 and bonus depreciation recovery worksheets. – Bailey eligibility tests confuse most first-time filers. – Part C residency allocation rules vary by income type and trip up many taxpayers. – Math errors on Part A trigger an NCDOR adjustment within weeks. – No representation if the agency challenges the return.
Pros of filing with a CPA or enrolled agent – Professional liability coverage protects against preparer math errors. – Faster handling of NCDOR notices through power of attorney. – Long-term planning around depreciation timing and Bailey survivor benefits. – Knowledge of recent statute and form changes that filers miss. – Cleaner records for any future state audit.
Cons of filing with help – Costs $200–$500 or more for individual returns. – Requires sharing sensitive financial data with a third party. – Adds scheduling friction during peak season. – Some preparers do not know Bailey rules deeply. – You still sign the return and own its accuracy.
Standard vs. Itemized at a Glance
| Filing Choice | When It Works Best |
|---|---|
| Standard deduction | Renters, smaller mortgages, no large medical or charitable spend, simpler returns |
| Part D itemized | Homeowners with mortgage plus property tax above $13,000 combined, large charitable gifts, high medical costs |
FAQs
Do I need to file Schedule S if I take the standard deduction and have no add-backs?
No. If you have no Part A additions, no Part B deductions, no Part C allocation, and no Part D itemized deductions, you can skip Schedule S entirely.
Can I claim Bailey on my IRA distributions?
No. Bailey covers only listed government retirement systems where you were vested by August 12, 1989, so traditional IRAs and 401(k)s never qualify.
Do I write my full retirement amount on Line 9 even if some came from a non-qualifying plan?
No. Enter only the portion from Bailey-qualifying plans; non-qualifying retirement income stays in federal AGI and is taxed normally.
Is the bonus depreciation add-back 100% or 85%?
Yes, it is 85%; the remaining 15% stays as a current-year North Carolina deduction baked into the federal number.
Should I enter Social Security on Line 8 if none was taxable federally?
No. Enter only the federal taxable portion from Form 1040 Line 6b; if zero is taxable, leave Line 8 blank or write 0.
Can married couples each claim a separate $20,000 mortgage and property tax cap on a joint return?
No. The cap is per return, so a joint return shares one $20,000 limit.
Do part-year residents file Part C even if they only lived in NC two months?
Yes. Any residency under twelve months requires Part C with both Column A and Column B filled in.
Is a 529 contribution deductible on Line 13 in 2025?
No. North Carolina repealed the individual 529 deduction in 2014 and has not reinstated it for tax year 2025.
Can I deduct vehicle property tax on Line 17?
No. Line 17 is real estate property tax only; vehicle tax does not qualify.
Do I attach Schedule S if I e-file?
Yes. The software transmits Schedule S electronically with the D-400, and you should save the PDF copy for your records.
Can I amend Schedule S if I forgot a Bailey deduction?
Yes. File Form D-400X within three years of the original due date to recover the missed Bailey deduction.
Should military retirees enter pension on Line 9 or Line 10?
Yes for Line 10 if they meet the 20-year or medical-retirement test, while Bailey-qualifying military retirees use Line 9 instead.
Do I round to the nearest dollar or include cents on Schedule S?
Yes, round to the nearest whole dollar; cents create scanner mismatches and slow processing.
Is the federal Qualified Opportunity Fund deferral honored by North Carolina?
No. North Carolina decoupled from IRC §1400Z-2, so the deferred gain is added back on Part A Line 2 in the year of deferral.
Related reading
- How to Fill Out North Carolina Withholding Form NC-4 + FAQs
- How to Fill Out South Carolina Withholding Form SC W-4 + FAQs
- How to Fill Out North Carolina Form D-400 Schedule A + FAQs
- How to Fill Out North Carolina Form D-400 Schedule PN + FAQs
- How to Fill Out North Carolina Form D-400 (w/Examples) + FAQs
- How to Fill Out North Carolina Form D-400X (w/Examples) + FAQs
- How to Fill Out North Carolina Form AOC-CV-100 (w/Examples) + FAQs