2026 Federal Income Tax Calculator

Background.

A federal income tax calculator answers the question every US wage earner eventually asks: given my income, my filing status, and my deductions, what do I actually owe the IRS this year? This calculator uses the 2026 tax year brackets, verified directly from the IRS on July 27, 2026 — the most recent inflation-adjusted figures the agency has published, released in Revenue Procedure 2025-32 on October 9, 2025. The seven tax rates themselves (10%, 12%, 22%, 24%, 32%, 35%, and 37%) did not change for 2026: the One, Big, Beautiful Bill Act, signed into law July 4, 2025, made the 2017 Tax Cuts and Jobs Act rate structure permanent instead of letting it expire at the end of 2025. What did change is the income level at which each rate kicks in — the IRS indexes those thresholds to inflation every year, and 2026's thresholds rose roughly 2.7% over 2025.

The single most important thing this calculator does — and the single most common thing people misunderstand about their own tax bill — is compute tax using marginal brackets rather than a flat rate. Your tax is not simply "your income times your bracket's rate." Instead, each dollar of income is taxed at the rate of the bracket it falls into: your first $12,400 (single) is taxed at 10%, the next chunk up to $50,400 at 12%, and so on, only reaching your top marginal rate for income above the highest threshold you cross. A taxpayer whose last dollar is taxed at 22% is NOT paying 22% on their entire taxable income — they are paying 22% only on the slice inside that bracket, with lower slices taxed at 10% and 12%. This calculator reports both numbers side by side: your marginal rate (the rate on the next dollar of taxable ordinary income) and this page's effective rate (estimated bracket tax divided by taxable income).

To use the calculator, enter your annual ordinary income covered by this estimate, choose your filing status, and confirm or adjust the standard deduction. The 2026 standard deduction defaults to $16,100 for Single filers; Married Filing Jointly filers should change it to $32,200. If you have additional above-the-line adjustments or itemize deductions in excess of the standard amount, enter that total in the Additional Deductions field. The calculator subtracts both from the entered income to get taxable income, then stacks the 2026 bracket rates against that figure.

This version of the calculator supports Single and Married Filing Jointly filing statuses. Head of Household and Married Filing Separately are not yet supported — the IRS's own newsroom summary for 2026 did not publish a complete, machine-readable bracket table for those statuses at the time this calculator was built, and rather than reconstruct those numbers from secondary sources, we chose to ship an honestly narrower tool rather than risk an unverified figure on a page millions of people use to plan their finances. Add those statuses in a future update once a primary-source table can be verified directly.

This calculator estimates ordinary-income federal bracket tax only. It does not model FICA payroll tax (Social Security and Medicare withholding), the Additional Medicare Tax, the Net Investment Income Tax, preferential capital-gains rates, state or local income tax, the Alternative Minimum Tax, or refundable/non-refundable tax credits that could change your final bill. For those, see Quanta's FICA tax, self-employment tax, capital gains tax, and quarterly tax estimator calculators, all linked below. Consult a qualified tax professional before making any filing decision — this tool is an educational estimate, not tax advice.

What is federal income tax calculator?

The US federal income tax system is progressive: it applies increasing marginal rates to successive slices of taxable income rather than one flat rate to your entire income. For 2026, there are seven marginal rates — 10%, 12%, 22%, 24%, 32%, 35%, and 37% — each applying only to the portion of taxable income that falls within its specific dollar range (its "bracket"). Taxable income is not the same as gross income: it is gross income minus deductions. Nearly every filer takes the standard deduction, a flat dollar amount the IRS adjusts annually for inflation — $16,100 for Single filers and $32,200 for Married Filing Jointly filers in 2026 — rather than itemizing individual deductible expenses (mortgage interest, state and local taxes up to the cap, charitable donations, and so on), because itemizing only helps if those itemized expenses exceed the standard deduction amount. Filing status matters because it changes both the standard deduction and where each bracket threshold falls; a Married Filing Jointly couple's brackets are roughly double a Single filer's at every rate, reflecting two incomes being taxed together. The One, Big, Beautiful Bill Act (Public Law 119-21, signed July 4, 2025) locked in the current seven-bracket structure permanently, ending the uncertainty about whether 2017's Tax Cuts and Jobs Act rates would revert to the older, higher pre-2018 brackets after 2025.

How to use this calculator.

1. 01Enter your annual gross income — total wages, salary, or self-employment income before any deductions.
2. 02Select your filing status: Single or Married Filing Jointly.
3. 03Confirm or adjust the standard deduction. It defaults to the 2026 Single amount ($16,100); Married Filing Jointly filers should change it to $32,200.
4. 04If you have additional above-the-line adjustments or itemize deductions beyond the standard amount, enter that total in Additional Deductions.
5. 05Read the Estimated Federal Bracket Tax — an ordinary-income estimate before credits and unmodeled taxes.
6. 06Compare your Marginal Tax Rate (the rate on your NEXT dollar earned) against your Effective Tax Rate (the average rate across everything you earned) — the gap between the two is usually the most surprising number on the page.

The formula.

Reviewed on 2026-07-27 against the IRS's own published 2026 figures. The calculation runs in two stages. First, taxable income is derived: gross income minus the standard deduction minus any additional deductions, floored at zero so that low earners never show a negative taxable income. Second, that taxable income is run through the 2026 bracket table for the selected filing status, stacking each bracket's rate against only the slice of income that falls inside it. For a Single filer, the 2026 brackets are: 10% on income up to $12,400; 12% on the portion from $12,400 to $50,400; 22% from $50,400 to $105,700; 24% from $105,700 to $201,775; 32% from $201,775 to $256,225; 35% from $256,225 to $640,600; and 37% on anything above $640,600. Married Filing Jointly brackets use roughly double those thresholds: 10% up to $24,800, 12% to $100,800, 22% to $211,400, 24% to $403,550, 32% to $512,450, 35% to $768,700, and 37% above that.

The marginal rate reported is simply the rate of the highest bracket actually reached — the rate that would apply to one more dollar of income. The effective rate is total tax divided by taxable income, expressed as a percentage; it is always less than or equal to the marginal rate, and the two are only equal when all of taxable income falls in the very first bracket (10%). This gap is the calculator's central teaching point: a filer whose marginal rate is 32% might have an effective rate closer to 21%, because most of their income was taxed at the lower rates below their top bracket.

These thresholds and rates are drawn directly from the IRS's own newsroom release covering Revenue Procedure 2025-32 (published October 9, 2025) and confirmed against the underlying revenue procedure text. The seven rates are permanent under the One, Big, Beautiful Bill Act (Public Law 119-21); only the dollar thresholds are re-indexed for inflation each year, which is why this same calculator's numbers will need to be updated again for the 2027 tax year once the IRS publishes new figures, typically each October or November.

A worked example.

Frequently asked questions.

References& sources.

1. [1]Internal Revenue Service (2025). "IRS releases tax inflation adjustments for tax year 2026, including amendments from the One, Big, Beautiful Bill." IRS Newsroom, October 9, 2025.
2. [2]Internal Revenue Service (2025). Revenue Procedure 2025-32.
3. [3]Internal Revenue Service. Publication 501: Dependents, Standard Deduction, and Filing Information.
4. [4]Internal Revenue Service. Publication 17: Your Federal Income Tax (For Individuals).
5. [5]119th United States Congress (2025). H.R. 1, "One Big Beautiful Bill Act," Public Law 119-21 (signed July 4, 2025).