Set aside the right amount for taxes.

How the math works

What the calculator actually computes.

• SE tax. 92.35% of your net profit is taxed at 15.3%: 12.4% Social Security up to the 2026 wage base of $184,500, plus 2.9% Medicare on all of it, plus an extra 0.9% Medicare above $200,000 single or $250,000 married.
• Federal income tax. Half your SE tax is deducted, then the 2026 standard deduction ($16,100 single, $32,200 married filing jointly) and a simplified 20% qualified business income deduction come off before the 2026 brackets apply.
• State income tax. Computed on your adjusted gross income with your state’s own 2026 brackets, not a flat guess. Pick your state below for the detail. Wondering what you can write off first? Start with the deduction guides for your trade.

Worked example

A $100,000 year, single filer in Texas.

• SE tax: $14,130. $100,000 × 92.35% = $92,350 of taxable earnings, × 15.3%.
• Federal income tax: $7,527. Income minus half the SE tax gives a $92,935 AGI; subtract the $16,100 standard deduction and an $18,587 QBI deduction, and the remaining $58,248 runs through the 2026 brackets.
• Total: $21,656, about $5,414 per quarter. Texas has no state income tax; in a state that does, the state line is added on top. Setting money aside each quarter? The quarterly estimated tax calculator turns this into a per deadline amount.

FAQ

Common questions.

What is the self employment tax rate for 2026?

15.3% of net earnings. That is 12.4% for Social Security plus 2.9% for Medicare, applied to 92.35% of your net profit. The Social Security part stops at the 2026 wage base of $184,500, and an extra 0.9% Medicare tax applies above $200,000 of earnings for single filers ($250,000 married filing jointly).

How much is self employment tax on $100,000?

About $14,130. The math: $100,000 times 92.35% is $92,350 of taxable earnings, times 15.3% is $14,129.55. Federal and state income tax come on top of that, which is what this calculator adds up for you.

Is half of my SE tax really deductible?

Yes. You deduct half of your SE tax as an adjustment to income on Form 1040, which lowers your adjusted gross income before income tax is figured. The calculator applies this automatically.

Does this include federal and state income tax?

Yes. It estimates SE tax, federal income tax using the 2026 brackets and standard deduction, a simplified 20% qualified business income deduction, and state income tax using each state's own 2026 brackets. Nine states charge no state income tax at all.

Educational estimate, not tax advice. 2026 figures: Social Security wage base per IRS Topic 751; standard deduction and brackets per Rev. Proc. 2025-32. The estimate excludes credits, dependents, retirement contributions, and QBI phaseout rules at higher incomes. Talk to a CPA before filing.