How do tax brackets actually work?

Only the dollars inside each bracket are taxed at that bracket’s rate. A raise that nudges you into the 22% bracket raises the rate on your last dollars, not on everything you earn — which is why the effective rate stays well below your marginal rate.

What is the standard deduction for 2025?

For 2025 it is $15,750 (2025) for single filers and $31,500 (2025) for married couples filing jointly. It replaces itemizing; you should itemize only when your itemized total — mortgage interest, state taxes, charity — beats it.

Why is my effective tax rate lower than my marginal rate?

The marginal rate applies only to your top slice of taxable income, while the effective rate is total tax divided by total income. Because the first brackets are taxed at 10% and 12%, and the standard deduction shelters some income entirely, the average always lands lower.

Does this include Social Security and Medicare taxes?

No. FICA is a separate payroll tax — 6.2% for Social Security on wages up to the 2025 wage base of $176,100, plus 1.45% for Medicare, with an extra 0.9% at high incomes. This tool estimates federal income tax only.

Are state income taxes included?

No. This estimate covers federal income tax only. State income taxes run from zero in states such as Texas and Florida to over 10% at the top in California, each with its own brackets and deductions.

Does the estimate include tax credits?

No. Credits reduce your tax dollar for dollar after the bracket math, so they can only lower the number shown here. If you qualify for the Child Tax Credit, the EITC, or education credits, your actual liability will be smaller.

Federal Income Tax Calculator | Online Calculators Free

What this calculator estimates

It estimates federal income tax on wages for the tax year you pick — 2025 (returns filed through 2026) or 2026 (the current planning year): subtract the standard deduction (or your itemized total), then walk that year’s brackets band by band. The board names the year, shows every contributing bracket, your marginal rate on the last dollar, and the effective rate on gross income.

The 2025 and 2026 numbers

2025 standard deduction (as amended by the One Big Beautiful Bill Act, July 2025): $15,750 single / $31,500 married filing jointly — up from the $15,000 / $30,000 originally announced. 2026 (IRS Rev. Proc. 2025-32): $16,100 / $32,200. 2025 single brackets: 10% to $11,925 · 12% to $48,475 · 22% to $103,350 · 24% to $197,300 · 32% to $250,525 · 35% to $626,350. 2026 single: 10% to $12,400 · 12% to $50,400 · 22% to $105,700 · 24% to $201,775 · 32% to $256,225 · 35% to $640,600. Married thresholds roughly double these (37% starts at $768,700 in 2026).

Marginal vs. effective rate

Your marginal rate is the rate on the last dollar earned — the top bracket you reach. Your effective rate is total tax divided by gross income, and it always lands lower, because the first dollars are taxed at 10% and 12% and the standard deduction is taxed at 0%. When a raise “puts you in a higher bracket,” only the extra dollars pay the higher rate.

Worked example

A single filer earns $75,000 and takes the 2025 standard deduction of $15,750.
Taxable income: 75,000 − 15,750 = $59,250.
Brackets stack: 10% × 11,925 = 1,192.50; 12% × 36,550 = 4,386.00; 22% × 10,775 = 2,370.50.
Total federal income tax = $7,949 — a 10.60% effective rate. For 2026 the same salary taxes at $7,670.

How to use it

Enter your gross annual income from all wages.
Pick Single or Married filing jointly.
Keep the standard deduction, or switch to Itemized and enter your total.
Read the bracket-by-bracket breakdown, marginal rate, and effective rate.