Federal Income Tax Calculator — 2025 Brackets, Effective & Marginal Rate

The question this calculator answers is the one you face every April: how much federal income tax do I actually owe on my return? That single number — your annual tax liability, the figure that ends up on your Form 1040 and decides whether you get a refund or write the IRS a check — is what we estimate here. It is not the same as the tax pulled from each paycheck, and it is not your net pay; it is the bottom-line federal bill the IRS settles up against your withholding at filing.

Where people go wrong is assuming a flat hit. Hear "I'm in the 22% bracket" and it sounds like the IRS skims 22% off every dollar — but the U.S. taxes income in layered tiers. Each tier, or bracket, only taxes the dollars that fall within its own band; lower bands fill before higher ones ever come into play. The highest band your income reaches is your marginal rate — what an extra dollar of income would cost. Average all the tiers together against your full income and you get your effective rate, the true share you hand over, which sits well below the marginal figure for almost everyone.

The estimate builds in three moves. One — reach taxable income. Take your income, remove pre-tax contributions (traditional 401(k), HSA), then remove your filing-status deduction. The 2025 standard deduction was lifted by the One Big Beautiful Bill Act to $15,750 (single), $31,500 (married filing jointly) and $23,625 (head of household) — note these are larger than the pre-OBBBA figures some charts still show. Two — layer the rates. The 2025 ordinary brackets run 10 / 12 / 22 / 24 / 32 / 35 / 37 percent, each biting only its own slice of taxable income. Three — total it up to get your liability, then divide by income for your effective rate.

Worked example. A single filer with $80,000 of income routes $5,000 into a traditional 401(k). Taxable income = 80,000 − 5,000 − 15,750 = $59,250. Layering the 2025 single brackets: the first $11,925 at 10% = $1,192.50; the band from $11,925 to $48,475 ($36,550) at 12% = $4,386; and the leftover $10,775 at 22% = $2,370.50. Tax owed ≈ $7,949. Their marginal rate is 22%, yet their effective rate is only 7,949 ÷ 80,000 ≈ 9.9% — proof that the bracket you name at a party is far above what you really pay. Note that paying 22% of the whole $80,000 would be $17,600 — more than double the real bill — which is exactly the error to avoid.

Two big costs sit outside this number, on purpose. FICA — the 7.65% Social Security and Medicare payroll tax — is a separate levy your employer withholds and is not part of your income-tax liability. State and local income tax is also separate, ranging from zero in states like Texas and Florida to over 13% at the top in California. This page is strictly about the annual federal liability you reconcile at filing; if instead you want to set the per-paycheck federal tax your employer withholds so your year-end balance lands near zero, use the W-4 Withholding Calculator, which translates this annual figure into a per-pay-period allowance. And for the dollars that actually reach your bank account each pay period — income tax plus FICA, 401(k) and health premiums netted out — the Take-Home Paycheck Calculator does that job.

This is an informational estimate of federal income tax only. It leaves out FICA, state and local tax, the Alternative Minimum Tax, and credits (Child Tax Credit, EITC, education credits) or adjustments beyond the standard deduction. It is not tax advice — confirm with a CPA or the IRS for your actual return.