North Carolina (NC) Self Employment Tax Calculator
Tax year: 2026 · Last updated 2026-06-22 · Source: IRS
Reviewed by CalcSumly Engineering Team, calculator authors and data architects · 2026-06-22
Your Schedule C net profit (income minus business expenses).
If you also had a job, enter wages already subject to Social Security.
Total tax (federal SE + NC income tax)
$13,761
Combined effective rate 17.2% of net profit · 2026 tax year
You owe about $11,304 in federal SE tax and $2,458 in North Carolina income tax — a combined $13,761. You can deduct $5,652 from federal income tax.
How this North Carolina self-employment tax calculator works
This calculator estimates your total tax on self-employment income in North Carolina for 2026. It combines two distinct layers of tax:
- Federal self-employment tax (Schedule SE) — 15.3% on 92.35% of your net profit, split between Social Security (12.4%, capped at the $184,500 wage base) and Medicare (2.9%, no cap). An extra 0.9% Additional Medicare applies above $200,000 (single) or $250,000 (MFJ). The deductible half — 50% of the base SE tax — is then subtracted from your gross income to arrive at federal AGI.
- North Carolina state income tax — North Carolina taxes NC taxable income at a flat 3.99% (2026). NC taxable income starts from federal AGI, then subtracts the NC standard deduction ($12,750 single / $25,500 MFJ). Pre-tax 401(k) deferrals reduce federal AGI and therefore reduce NC taxable income as well.
Step-by-step calculation
- Net earnings: Net profit × 92.35% = SE tax base.
- Federal SE tax: Social Security + Medicare + Additional Medicare (if applicable).
- Deductible half: ½ × (Social Security + Medicare) — deducted above the line on Form 1040.
- Federal AGI from SE: Net profit − deductible half.
- North Carolina taxable income: Federal AGI minus the North Carolina standard deduction ($12,750 single).
- North Carolina income tax: Flat 3.99% applied to North Carolina taxable income.
Scope and limitations
What is excluded: Excludes North Carolina local taxes. SDI is not applicable in North Carolina. The NC standard deduction reflects current enacted law; pending 2025 GA legislation (SB 257, SB 437) may increase these amounts — verify at ncdor.gov before relying on results for planning after any bill is signed. This calculator models a single Schedule C filer with no other income sources. It does not include QBI deduction (20%), health insurance deductions, retirement plan contributions, tax credits, or itemized deductions. Consult a tax professional for your full return.
Use this for planning, not filing. Every rate and threshold is pulled from official IRS, SSA, and NCDOR — Tax Rate Schedules (3.99% for taxable years after 2025, per Session Law 2023-134) publications and re-checked each January.
Sources
- IRS — Self-Employment Tax (Schedule SE)
- SSA — 2026 Social Security wage base ($184,500)
- IRS — Topic 751 Additional Medicare Tax
- IRS — Rev. Proc. 2025-32 (2026 inflation adjustments)
- IRS — Form 1040-ES (Estimated Tax for Individuals)
- IRS Notice 2025-67 — 2026 Retirement Plan Limits (§415, §402(g), §401(a)(17))
- IRS — SEP Contribution Limits 2026 ($72,000)
- IRS Notice 2026-10 — 2026 Standard Mileage Rates (72.5 cents/mile)
- IRS Rev. Proc. 2013-13 — Home Office Simplified Method ($5/sqft, 300 sqft max)
- IRS Publication 946 (2026) — Section 179 Deduction ($2,560,000 limit; $32,000 SUV cap)
- NCDOR — Tax Rate Schedules (3.99% for taxable years after 2025, per Session Law 2023-134)
- NCDOR — North Carolina Standard Deduction ($12,750 single / $25,500 MFJ — 2025 enacted law)
Frequently asked questions
What is North Carolina's income tax rate on self-employment income?+
North Carolina has a flat 3.99% individual income tax rate for 2026 (reduced from 4.5% in 2024 and 4.25% in 2025 as part of NC's scheduled phase-down). The standard deduction is $12,750 for single filers and $25,500 for MFJ for 2026. NC taxes the same base (AGI minus standard deduction) for W-2 employees and self-employed people alike. Source: North Carolina Department of Revenue.
Is North Carolina's income tax rate continuing to decrease?+
Yes. North Carolina has been phasing down its flat income tax rate since 2022 under HB 334. The rate schedule has continued downward: 4.99% (2022), 4.75% (2023), 4.5% (2024), 4.25% (2025), 3.99% (2026). Future reductions depend on revenue triggers specified in state law. For 2026, the confirmed rate is 3.99%.
What is self-employment tax?+
Self-employment (SE) tax is the Social Security and Medicare tax paid by freelancers, 1099 contractors, and sole proprietors. Employees split these costs with their employer (7.65% each); when you work for yourself you pay both halves — 15.3% total — on 92.35% of your net profit. It is separate from, and on top of, federal and state income tax.
Do I also owe North Carolina state income tax on my self-employment income?+
Yes. In addition to federal SE tax, North Carolina taxes self-employment net profit as ordinary income. This calculator shows both: the federal SE tax (Social Security + Medicare) and the estimated North Carolina state income tax side by side, so you can see your true combined tax bill.
Can I deduct half of my self-employment tax?+
Yes — from federal income tax. You can deduct one half of your Social Security and Medicare SE tax as an above-the-line adjustment to income on Form 1040. This deductible half also reduces your federal AGI, which in turn reduces your state taxable income in most states (except Pennsylvania, which taxes gross compensation regardless).
How can I lower my self-employment tax?+
SE tax is based on net profit (gross revenue minus business expenses), so every legitimate business deduction reduces both your SE tax and your state income tax. Common deductions include home-office use ($5/sqft simplified method), equipment and software (Section 179), business mileage, and professional services. The standard deduction and QBI deduction reduce income tax only — not SE tax.
When do I pay self-employment tax?+
SE tax is paid through quarterly estimated payments (Form 1040-ES), due April 15, June 16, September 15, and January 15 for the prior year's fourth quarter. If you expect to owe $1,000 or more in federal tax after withholding, you generally must pay quarterly to avoid the IRS underpayment penalty. Most states that tax SE income have parallel quarterly estimated payment requirements.
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