North Carolina Individual Income Tax Skill — Self-Employed / Sole Proprietor
General reference only. This skill is general tax/accounting reference material for AI-assisted workflows. It has not been reviewed for any specific person's facts, documents, elections, deadlines, residency, filing status, or local procedures. Do not rely on it to file, pay, amend, or take a tax position without review by a qualified professional in the relevant jurisdiction.
Scope. This skill covers North Carolina Form D-400 (Individual Income Tax Return)
for full-year NC residents who are sole proprietors or single-member LLC owners.
Tax year 2025 (returns filed in 2026). North Carolina uses a flat income tax rate.
Quality tier. Q3 — AI-drafted, not independently verified. All outputs must be
reviewed by a qualified tax professional before filing.
Section 1: Metadata
| Field |
Value |
| Tax type |
Individual income tax |
| Jurisdiction |
North Carolina (US-NC) |
| Tax year |
2025 (filed 2026) |
| Primary form |
Form D-400 |
| Supporting schedules |
D-400 Schedule S (Additions/Deductions), D-400TC (Tax Credits), D-400 Schedule A (NC Itemized Deductions) |
| Tax structure |
Flat rate |
| Rate |
4.25% (TY 2025) |
| Filing deadline |
April 15, 2026 |
| Extension deadline |
October 15, 2026 |
| Tax authority |
North Carolina Department of Revenue (NCDOR) |
| Website |
https://www.ncdor.gov |
| Statute |
N.C.G.S. Chapter 105, Article 4 |
Sources:
Section 2: Quick reference — rates and thresholds
Tax rate
| Tax year |
Rate |
Source |
| 2025 |
4.25% |
Session Law 2023-134; NCDOR Tax Rate Schedules |
| 2026 |
3.99% |
Session Law 2023-134; NCDOR Tax Rate Schedules |
North Carolina applies a single flat rate to all taxable income regardless of filing status or income level.
Standard deduction (TY 2025)
| Filing status |
Standard deduction |
| Single |
$12,750 |
| Married filing jointly |
$25,500 |
| Married filing separately |
$12,750 |
| Head of household |
$19,125 |
Child deduction (TY 2025)
| NC AGI threshold (MFJ) |
Deduction per child |
| Up to $40,000 |
$3,000 |
| $40,001 – $60,000 |
$2,500 |
| $60,001 – $80,000 |
$2,000 |
| $80,001 – $100,000 |
$1,500 |
| $100,001 – $120,000 |
$1,000 |
| $120,001 – $140,000 |
$500 |
| Over $140,000 |
$0 |
NC does not have personal exemptions — the child deduction is the only per-dependent benefit.
Local income tax
North Carolina does not permit local income taxes.
Section 3: How this skill works with the federal return
North Carolina taxable income starts with federal adjusted gross income (AGI) from federal Form 1040, Line 11.
- Start with federal AGI → D-400, Line 6
- Add NC additions (Schedule S, Part A) — items NC adds back that were excluded or deducted federally
- Subtract NC deductions (Schedule S, Part B) — items NC excludes that were included federally
- Result = NC adjusted gross income
- Subtract the NC standard deduction (or NC itemized deductions) and child deduction
- Result = NC taxable income → multiply by 4.25%
- Subtract credits (D-400TC) → final tax due or refund
Key addition modifications (Schedule S, Part A)
| Addition |
Description |
| Interest from other states' bonds |
Interest income from bonds of states other than NC |
| Bonus depreciation add-back |
NC does not conform to IRC §168(k) bonus depreciation |
| Section 179 excess |
NC limits §179 to $25,000 (does not conform to federal expanded amount) |
Key subtraction modifications (Schedule S, Part B)
| Subtraction |
Description |
| US government bond interest |
Interest from US Treasury obligations |
| Retirement benefits (Bailey Settlement) |
Certain state/local government retirees exempt per court settlement |
| Social Security |
NC does not tax Social Security benefits |
Section 4: Self-employed specific rules
Self-employment income flow
Schedule C net profit flows into federal AGI, which flows into NC AGI. NC has no separate self-employment tax — the 4.25% rate applies to all taxable income including self-employment income.
Estimated tax
NC requires estimated tax payments if you expect to owe $1,000 or more after subtracting withholding and credits.
| Installment |
Due date |
| 1st quarter |
April 15 |
| 2nd quarter |
June 15 |
| 3rd quarter |
September 15 |
| 4th quarter |
January 15 (following year) |
Form NC-40 is used for estimated tax payments.
Depreciation decoupling
NC does not conform to federal bonus depreciation under IRC §168(k). Taxpayers must add back the difference between federal and NC-allowed depreciation on Schedule S. NC follows its own depreciation schedule (generally pre-TCJA rules). This is critical for self-employed taxpayers with significant equipment or vehicle purchases.
Section 179
NC limits the Section 179 deduction to $25,000 (not the federal expanded amount). Any excess must be added back on Schedule S.
Section 5: Tier 1 rules — deterministic
| Rule ID |
Rule |
Source |
| NC-T1-01 |
NC taxable income = federal AGI ± NC modifications − standard/itemized deduction − child deduction |
N.C.G.S. §105-153.4 |
| NC-T1-02 |
Tax = NC taxable income × 4.25% (TY 2025) |
N.C.G.S. §105-153.7; Session Law 2023-134 |
| NC-T1-03 |
Standard deduction: $12,750 (S), $25,500 (MFJ), $12,750 (MFS), $19,125 (HOH) |
N.C.G.S. §105-153.5(a)(1) |
| NC-T1-04 |
NC §179 limit = $25,000 |
N.C.G.S. §105-153.6 |
| NC-T1-05 |
NC does not conform to IRC §168(k) bonus depreciation |
N.C.G.S. §105-130.5B |
| NC-T1-06 |
Estimated tax required if expected liability ≥ $1,000 |
N.C.G.S. §105-163.15 |
| NC-T1-07 |
NC does not tax Social Security benefits |
N.C.G.S. §105-153.5(b)(8) |
Section 6: Tier 2 rules — requires judgment
| Rule ID |
Situation |
Guidance |
| NC-T2-01 |
Multi-state income: Taxpayer has income from another state |
NC taxes all income of residents; credit for taxes paid to other states available on D-400TC. Allocation requires review. |
| NC-T2-02 |
Business vs. hobby determination |
NC follows federal hobby loss rules. If IRS disallows Schedule C, NC deductions are also disallowed. |
| NC-T2-03 |
IRC conformity date changes |
NC references IRC as of a specific date. If federal law changed after NC's conformity date, add-backs or subtractions may be required. Verify conformity date for the tax year. |
| NC-T2-04 |
Home office deduction |
NC conforms to federal home office deduction rules. Flows through federal AGI. No separate NC adjustment needed. |
| NC-T2-05 |
Net operating losses |
NC conforms to federal NOL rules with modifications. Post-2017 NOLs limited to 80% of taxable income. Carryforward only (no carryback). |
Section 7: Supplier pattern library
| Input needed |
Where to find it |
| Federal AGI |
Federal Form 1040, Line 11 |
| NC additions |
Schedule S, Part A (computed from federal return) |
| NC deductions |
Schedule S, Part B (computed from federal return) |
| Standard deduction |
Based on filing status |
| Child deduction |
Based on NC AGI and number of qualifying children |
| Tax credits |
D-400TC (credit for taxes paid to other states, child tax credit, etc.) |
| Estimated tax payments |
NC-40 records |
| NC withholding |
W-2 Box 17 / 1099 NC withholding amounts |
Section 8: Form mapping
| Form D-400 Line |
Description |
Source |
| Line 6 |
Federal adjusted gross income |
Federal 1040, Line 11 |
| Line 7 |
Additions from Schedule S |
Schedule S, Part A total |
| Line 9 |
Deductions from Schedule S |
Schedule S, Part B total |
| Line 11 |
NC standard deduction or NC itemized deductions |
Computed |
| Line 13 |
Child deduction |
Based on NC AGI and dependents |
| Line 14 |
NC taxable income |
Line 6 + Line 7 − Line 9 − Line 11 − Line 13 |
| Line 15 |
NC income tax |
Line 14 × 0.0425 |
| Line 20 |
Tax credits |
D-400TC total |
| Line 23 |
NC tax withheld |
W-2s / 1099s |
| Line 25 |
Estimated tax payments |
NC-40 payments |
Section 9: Refusal catalogue
| Refusal ID |
Trigger |
Response |
| R-NC-01 |
Part-year or nonresident |
"NC part-year and nonresident returns require Schedule PN. This is outside the scope of this skill." |
| R-NC-02 |
Corporate or S-corp return |
"This skill covers individual income tax only (Form D-400). Corporate returns (CD-405) are not covered." |
| R-NC-03 |
Estate or trust return |
"NC fiduciary returns (Form D-407) are not covered by this skill." |
| R-NC-04 |
Amended return |
"NC amended returns (Form D-400X Amended) are not covered." |
| R-NC-05 |
Pass-through entity tax |
"NC PTET elections are not covered by this skill." |
Disclaimer
This skill and its outputs are provided for informational and computational purposes only and do not constitute tax, legal, or financial advice. Open Accountants and its contributors accept no liability for any errors, omissions, or outcomes arising from the use of this skill. All outputs must be reviewed and signed off by a qualified professional before filing or acting upon.
The most up-to-date, verified version of this skill is maintained at openaccountants.com.
Source: OpenAccountants — open tax Guides for AI, reviewed by named CPAs/CAs/EAs. Quality: source-cited draft. For always-current figures and named-accountant backing, connect the OpenAccountants MCP server (openaccountants-mcp).
1---2name: nc-income-tax3description: > Use this skill whenever asked about North Carolina individual income tax for self-employed / sole proprietors. Trigger on phrases like "North Carolina income tax", "NC income tax", "Form D-400", "NCDOR income tax", "NC self-employment tax".4license: AGPL-3.0-or-later (code) / OpenAccountants Guide License v1.0 (c5---67# North Carolina Individual Income Tax Skill — Self-Employed / Sole Proprietor89> **General reference only.** This skill is general tax/accounting reference material for AI-assisted workflows. It has not been reviewed for any specific person's facts, documents, elections, deadlines, residency, filing status, or local procedures. Do not rely on it to file, pay, amend, or take a tax position without review by a qualified professional in the relevant jurisdiction.1011> **Scope.** This skill covers North Carolina Form D-400 (Individual Income Tax Return)12> for full-year NC residents who are sole proprietors or single-member LLC owners.13> Tax year 2025 (returns filed in 2026). North Carolina uses a flat income tax rate.14>15> **Quality tier.** Q3 — AI-drafted, not independently verified. All outputs must be16> reviewed by a qualified tax professional before filing.1718---1920## Section 1: Metadata2122| Field | Value |23|---|---|24| Tax type | Individual income tax |25| Jurisdiction | North Carolina (US-NC) |26| Tax year | 2025 (filed 2026) |27| Primary form | Form D-400 |28| Supporting schedules | D-400 Schedule S (Additions/Deductions), D-400TC (Tax Credits), D-400 Schedule A (NC Itemized Deductions) |29| Tax structure | Flat rate |30| Rate | 4.25% (TY 2025) |31| Filing deadline | April 15, 2026 |32| Extension deadline | October 15, 2026 |33| Tax authority | North Carolina Department of Revenue (NCDOR) |34| Website | https://www.ncdor.gov |35| Statute | N.C.G.S. Chapter 105, Article 4 |3637**Sources:**38- NCDOR, Tax Rate Schedules: https://www.ncdor.gov/taxes-forms/individual-income-tax/tax-rate-schedules39- NCDOR, 2025 D-401 Individual Income Tax Instructions: https://www.ncdor.gov/2025-d-401-individual-income-tax-instructions/open40- Session Law 2023-134 (rate schedule for future years)4142---4344## Section 2: Quick reference — rates and thresholds4546### Tax rate4748| Tax year | Rate | Source |49|---|---|---|50| 2025 | 4.25% | Session Law 2023-134; NCDOR Tax Rate Schedules |51| 2026 | 3.99% | Session Law 2023-134; NCDOR Tax Rate Schedules |5253North Carolina applies a single flat rate to all taxable income regardless of filing status or income level.5455### Standard deduction (TY 2025)5657| Filing status | Standard deduction |58|---|---|59| Single | $12,750 |60| Married filing jointly | $25,500 |61| Married filing separately | $12,750 |62| Head of household | $19,125 |6364### Child deduction (TY 2025)6566| NC AGI threshold (MFJ) | Deduction per child |67|---|---|68| Up to $40,000 | $3,000 |69| $40,001 – $60,000 | $2,500 |70| $60,001 – $80,000 | $2,000 |71| $80,001 – $100,000 | $1,500 |72| $100,001 – $120,000 | $1,000 |73| $120,001 – $140,000 | $500 |74| Over $140,000 | $0 |7576NC does not have personal exemptions — the child deduction is the only per-dependent benefit.7778### Local income tax7980North Carolina does **not** permit local income taxes.8182---8384## Section 3: How this skill works with the federal return8586North Carolina taxable income starts with **federal adjusted gross income (AGI)** from federal Form 1040, Line 11.87881. **Start with federal AGI** → D-400, Line 6892. **Add NC additions** (Schedule S, Part A) — items NC adds back that were excluded or deducted federally903. **Subtract NC deductions** (Schedule S, Part B) — items NC excludes that were included federally914. **Result = NC adjusted gross income**925. **Subtract** the NC standard deduction (or NC itemized deductions) and child deduction936. **Result = NC taxable income** → multiply by 4.25%947. **Subtract credits** (D-400TC) → final tax due or refund9596### Key addition modifications (Schedule S, Part A)9798| Addition | Description |99|---|---|100| Interest from other states' bonds | Interest income from bonds of states other than NC |101| Bonus depreciation add-back | NC does not conform to IRC §168(k) bonus depreciation |102| Section 179 excess | NC limits §179 to $25,000 (does not conform to federal expanded amount) |103104### Key subtraction modifications (Schedule S, Part B)105106| Subtraction | Description |107|---|---|108| US government bond interest | Interest from US Treasury obligations |109| Retirement benefits (Bailey Settlement) | Certain state/local government retirees exempt per court settlement |110| Social Security | NC does not tax Social Security benefits |111112---113114## Section 4: Self-employed specific rules115116### Self-employment income flow117118Schedule C net profit flows into federal AGI, which flows into NC AGI. NC has no separate self-employment tax — the 4.25% rate applies to all taxable income including self-employment income.119120### Estimated tax121122NC requires estimated tax payments if you expect to owe **$1,000 or more** after subtracting withholding and credits.123124| Installment | Due date |125|---|---|126| 1st quarter | April 15 |127| 2nd quarter | June 15 |128| 3rd quarter | September 15 |129| 4th quarter | January 15 (following year) |130131Form NC-40 is used for estimated tax payments.132133### Depreciation decoupling134135NC does not conform to federal bonus depreciation under IRC §168(k). Taxpayers must add back the difference between federal and NC-allowed depreciation on Schedule S. NC follows its own depreciation schedule (generally pre-TCJA rules). This is critical for self-employed taxpayers with significant equipment or vehicle purchases.136137### Section 179138139NC limits the Section 179 deduction to **$25,000** (not the federal expanded amount). Any excess must be added back on Schedule S.140141---142143## Section 5: Tier 1 rules — deterministic144145| Rule ID | Rule | Source |146|---|---|---|147| NC-T1-01 | NC taxable income = federal AGI ± NC modifications − standard/itemized deduction − child deduction | N.C.G.S. §105-153.4 |148| NC-T1-02 | Tax = NC taxable income × 4.25% (TY 2025) | N.C.G.S. §105-153.7; Session Law 2023-134 |149| NC-T1-03 | Standard deduction: $12,750 (S), $25,500 (MFJ), $12,750 (MFS), $19,125 (HOH) | N.C.G.S. §105-153.5(a)(1) |150| NC-T1-04 | NC §179 limit = $25,000 | N.C.G.S. §105-153.6 |151| NC-T1-05 | NC does not conform to IRC §168(k) bonus depreciation | N.C.G.S. §105-130.5B |152| NC-T1-06 | Estimated tax required if expected liability ≥ $1,000 | N.C.G.S. §105-163.15 |153| NC-T1-07 | NC does not tax Social Security benefits | N.C.G.S. §105-153.5(b)(8) |154155---156157## Section 6: Tier 2 rules — requires judgment158159| Rule ID | Situation | Guidance |160|---|---|---|161| NC-T2-01 | **Multi-state income:** Taxpayer has income from another state | NC taxes all income of residents; credit for taxes paid to other states available on D-400TC. Allocation requires review. |162| NC-T2-02 | **Business vs. hobby determination** | NC follows federal hobby loss rules. If IRS disallows Schedule C, NC deductions are also disallowed. |163| NC-T2-03 | **IRC conformity date changes** | NC references IRC as of a specific date. If federal law changed after NC's conformity date, add-backs or subtractions may be required. Verify conformity date for the tax year. |164| NC-T2-04 | **Home office deduction** | NC conforms to federal home office deduction rules. Flows through federal AGI. No separate NC adjustment needed. |165| NC-T2-05 | **Net operating losses** | NC conforms to federal NOL rules with modifications. Post-2017 NOLs limited to 80% of taxable income. Carryforward only (no carryback). |166167---168169## Section 7: Supplier pattern library170171| Input needed | Where to find it |172|---|---|173| Federal AGI | Federal Form 1040, Line 11 |174| NC additions | Schedule S, Part A (computed from federal return) |175| NC deductions | Schedule S, Part B (computed from federal return) |176| Standard deduction | Based on filing status |177| Child deduction | Based on NC AGI and number of qualifying children |178| Tax credits | D-400TC (credit for taxes paid to other states, child tax credit, etc.) |179| Estimated tax payments | NC-40 records |180| NC withholding | W-2 Box 17 / 1099 NC withholding amounts |181182---183184## Section 8: Form mapping185186| Form D-400 Line | Description | Source |187|---|---|---|188| Line 6 | Federal adjusted gross income | Federal 1040, Line 11 |189| Line 7 | Additions from Schedule S | Schedule S, Part A total |190| Line 9 | Deductions from Schedule S | Schedule S, Part B total |191| Line 11 | NC standard deduction or NC itemized deductions | Computed |192| Line 13 | Child deduction | Based on NC AGI and dependents |193| Line 14 | NC taxable income | Line 6 + Line 7 − Line 9 − Line 11 − Line 13 |194| Line 15 | NC income tax | Line 14 × 0.0425 |195| Line 20 | Tax credits | D-400TC total |196| Line 23 | NC tax withheld | W-2s / 1099s |197| Line 25 | Estimated tax payments | NC-40 payments |198199---200201## Section 9: Refusal catalogue202203| Refusal ID | Trigger | Response |204|---|---|---|205| R-NC-01 | Part-year or nonresident | "NC part-year and nonresident returns require Schedule PN. This is outside the scope of this skill." |206| R-NC-02 | Corporate or S-corp return | "This skill covers individual income tax only (Form D-400). Corporate returns (CD-405) are not covered." |207| R-NC-03 | Estate or trust return | "NC fiduciary returns (Form D-407) are not covered by this skill." |208| R-NC-04 | Amended return | "NC amended returns (Form D-400X Amended) are not covered." |209| R-NC-05 | Pass-through entity tax | "NC PTET elections are not covered by this skill." |210211---212213## Disclaimer214215This skill and its outputs are provided for informational and computational purposes only and do not constitute tax, legal, or financial advice. Open Accountants and its contributors accept no liability for any errors, omissions, or outcomes arising from the use of this skill. All outputs must be reviewed and signed off by a qualified professional before filing or acting upon.216217The most up-to-date, verified version of this skill is maintained at [openaccountants.com](https://openaccountants.com).218219---220221_Source: [OpenAccountants](https://openaccountants.com/skills/nc-income-tax) — open tax Guides for AI, reviewed by named CPAs/CAs/EAs. Quality: **source-cited draft**. For always-current figures and named-accountant backing, connect the OpenAccountants MCP server (`openaccountants-mcp`)._
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