US Income Tax Calculator
Federal income tax on ordinary income at 2026 rates — standard vs itemized, pre-tax contributions, and FICA shown separately. Free.
Pre-tax contributions & deductions
Federal income tax
Payroll tax (FICA) & take-home
FICA rides on wages, not taxable income — a 401(k) dollar still pays it. Employer-side FICA is not shown.
Unused pre-tax contribution room
What filling each 2026 limit would save in federal tax, priced by recomputing the bill rather than by applying your headline marginal rate.
- 401(k) elective deferralMax $24,500.00
$24,500.00 available
Saves $5,390.00 if filled
- Traditional IRAMax $7,500.00
$7,500.00 available
Saves $1,650.00 if filled
- HSA (self-only coverage)Max $4,400.00
$4,400.00 available
Saves $968.00 if filled
Limits are statutory, not advice to contribute. A 401(k) dollar is locked until 59½, an HSA needs a high-deductible health plan, and traditional IRA deductibility phases out with income if you or your spouse have a workplace plan.
- · Federal only — state income tax ranges from 0% (TX, FL, WA) to over 13% (CA) and is not included.
2026 tax year. Ordinary income only — capital gains use their own brackets (see the US Capital Gains calculator). Credits (child tax credit, EITC), AMT, self-employment tax and state-specific rules are not modelled. This is an estimator, not tax advice.
US Income Tax Calculator: how it works
Federal income tax is charged on taxable income — gross income less pre-tax contributions (401(k), traditional IRA, HSA) and then the larger of your standard or itemized deduction — through the 10% to 37% brackets. Payroll tax (FICA) is separate: 6.2% Social Security up to the $184,500 wage base plus 1.45% Medicare on all wages, with a further 0.9% above $200,000 single or $250,000 married filing jointly. FICA is unaffected by any of those deductions.
Formula
Taxable income = gross − (401(k) + IRA + HSA) − max(standard, itemized) · Federal tax = bracketed 10/12/22/24/32/35/37% on taxable income · FICA = 6.2% × min(wages, 184,500) + 1.45% × wages + 0.9% × wages over threshold. Federal only; state tax is separate.