Self-Employed Tax Calculator 2026

How the 15.3% self-employment tax is calculated

Self-employment tax is the freelancer's version of payroll tax. A W-2 employee pays 7.65% toward Social Security and Medicare and the employer quietly pays the other 7.65%; when you freelance, contract, or earn 1099 income, you are both sides of that transaction, so you carry the full 15.3% — 12.4% for Social Security plus 2.9% for Medicare.

The math runs in three steps, and the calculator's breakdown table shows each one:

1. Net profit × 92.35%. The tax base is not your gross receipts — it is your Schedule C net profit (after business expenses), then multiplied by 92.35%. That factor exists so the self-employed are not taxed on the portion of earnings a W-2 worker's employer would effectively deduct.
2. Social Security: 12.4%, with a cap. For 2026, the Social Security wage base is $184,500 (per the SSA's official announcement), and it is shared with your W-2 wages. If a day job already pushes you over the cap, the SE-tax Social Security portion drops to zero. Dual earners get this wrong most often.
3. Medicare: 2.9%, no cap. Every dollar of net earnings from self-employment owes the Medicare portion, and above $200,000 of combined wages and SE earnings (single), the additional 0.9% Medicare surtax kicks in.

One rule almost nobody mentions: if net earnings from self-employment (after the 92.35% factor) come to less than $400, you owe no SE tax at all. A side gig that clears a few hundred dollars does not trigger it.

Yes, you still pay income tax on top

SE tax and federal income tax are two separate taxes that stack. The most common blind spot among new freelancers is thinking 15.3% is the whole story — in the $75,000 example above, it is $10,597 of SE tax plus $6,504 of income tax.

The tax code softens the blow in one place: half of your SE tax is deductible from AGI (about $5,299 in the example). It is the portion you paid "as the employer," and it lowers the income tax you owe. The calculator applies it automatically and shows it as the last line of the breakdown.

Put the same $75,000 side by side: a W-2 worker owes about $13,408 in federal tax ($7,670 income tax plus $5,738 FICA), while the self-employed owe about $17,101 — a gap of roughly $3,694, which is mostly the employer half of payroll tax, minus what the half deduction gives back. That is the real price of going solo.

Quarterly estimated taxes: the second hurdle

Nobody withholds taxes from a freelancer's checks, so the IRS requires you to prepay your own tax in quarterly installments using Form 1040-ES:

| Quarter | Covers | Deadline | |---|---|---| | Q1 | Jan – Mar | April 15 | | Q2 | Apr – May | June 15 | | Q3 | Jun – Aug | September 15 | | Q4 | Sep – Dec | January 15 (next year) |

The penalty-free safe harbors: total payments of 90% of this year's tax, or 100% of last year's tax (110% if last year's AGI topped $150,000) — meet either one and underpayment penalties do not apply. The results card above suggests a per-quarter payment using the 90% harbor; it covers federal tax only, since state estimates are separate. Miss a quarter and interest accrues on the shortfall for each quarter it stays unpaid.

To compare total tax across different income mixes, use the 2026 income tax calculator; for a fast refund-or-owed estimate, use the tax calculator.

Four mistakes self-employed filers make

1. Estimating tax on gross receipts. SE tax is figured on Schedule C net profit. Before estimating, subtract software, supplies, home office, health insurance premiums, and other legitimate business expenses — they cut both taxes at once.
2. Forgetting the half deduction. Many quick online tools multiply income by 15.3% and stop there, overstating your income tax by ignoring the AGI adjustment.
3. Skipping estimated payments entirely. Waiting to hand the IRS $17,000 in April means paying underpayment interest on top. A common rule of thumb is setting aside 25%–30% of every payment received.
4. Ignoring state tax. The nine states with no income tax on wages — Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming — count as zero automatically. Everywhere else, enter your own rate in the state field and the total includes it, labeled as your input rather than our estimate.

How to use this self-employment tax calculator

1. Enter your net self-employment income — Schedule C profit (line 31), after business expenses. The page opens with a $75,000 single-filer example so there is a result on screen immediately.
2. Add W-2 wages if you have any. The $184,500 Social Security cap is shared across both, and the calculator handles the interaction.
3. Pick your filing status and state. In states with income tax, enter your own rate to include state tax in the total.
4. Have 401(k) or SEP contributions, estimated payments already made, or a 65th birthday behind you? Open Advanced options. Enter tax already paid and the results add an estimated refund or balance due.
5. Read the results: the headline is your 15.3% SE tax; the breakdown table walks through the 92.35% factor, the Social Security and Medicare portions, and the deductible half; below that sits the suggested quarterly payment.

Frequently asked questions

How much is self-employment tax on $75,000?

For 2026, single with no W-2 wages: $75,000 net profit × 92.35% = $69,263 of net earnings; Social Security at 12.4% is about $8,589 and Medicare at 2.9% about $2,009, for $10,597 total. That is on top of roughly $6,504 of federal income tax — about $17,101 combined before state tax.

How do I calculate my self-employment tax?

Three steps: multiply Schedule C net profit by 92.35%; apply 12.4% for Social Security up to $184,500 of combined wages and SE earnings; apply 2.9% for Medicare with no cap. Net earnings under $400 are exempt. The breakdown table in this calculator shows every step with your own numbers.

Why is self-employment tax 15.3%?

Employees pay 7.65% (6.2% Social Security + 1.45% Medicare) and employers pay a matching 7.65% that workers never see. The self-employed pay both halves. In exchange, half of the SE tax — effectively the employer share — is deductible from AGI.

Can I deduct half of my self-employment tax?

Yes, automatically — no itemizing required. You subtract 50% of SE tax on Schedule 1 of Form 1040. On $75,000 of net profit, the deduction is about $5,299, which saves roughly $1,166 of income tax for someone in the 22% bracket.

Do I pay self-employment tax and income tax?

Yes, they stack. SE tax funds Social Security and Medicare; income tax is separate and applies to your net profit (reduced by the half-SE-tax deduction and self-employed health insurance) at the regular 2026 progressive rates from 10% to 37%. This calculator totals both, plus state tax if you enter a rate.

When are quarterly estimated taxes due?

April 15, June 15, September 15, and January 15 of the following year (shifted to the next business day when they land on a weekend or holiday), covering the periods in the table above. Payments go out with Form 1040-ES. The safe harbors — 90% of this year's tax or 100% of last year's (110% for higher earners) — are what keep penalties away.

What happens if I don't pay quarterly taxes?

The IRS charges interest on the underpaid amount for each quarter it remains unpaid (the rate floats with federal rates and resets quarterly), plus a possible penalty — the April surprise is bigger than most freelancers expect. If cash flow is the problem, pay what you can each quarter; interest accrues only on the shortfall.

Is there a cap on the Social Security part of SE tax?

Yes — $184,500 for 2026, and it is shared with your W-2 wages. Net earnings above the cap owe only the 2.9% Medicare portion. Medicare itself has no cap, and earnings above $200,000 (single) trigger the extra 0.9% surtax on top.

Sources: SE tax rules (92.35% factor, $400 threshold, half deduction) per IRS Schedule SE; SSA 2026 COLA announcement (Federal Register 2025-19763, 2025-11-03; $184,500 Social Security wage base); IRS Rev. Proc. 2025-32 (2026 tax brackets and standard deduction; verified against the original text on 2026-09-21). More tools in the finance calculators hub.

Disclaimer: This calculator provides informational estimates only — it is not tax, financial, or legal advice. Not included: local taxes, itemized deductions, tax credits (CTC/EITC), AMT, preferential capital gains rates, and the QBI deduction (Section 199A). Figures are based on the sources above as of the dates shown. For decisions about your own return, consult a licensed tax professional.