Tax Bracket Calculator

What this calculator does

This calculator shows how a given income is distributed across the federal tax brackets. Enter your annual income and it applies the standard deduction, splits what remains across the bracket thresholds, and reports the total federal income tax, your effective rate, and your marginal rate.

The output is deliberately visual because the arithmetic is easy but the intuition is not. Seeing income divided into slices, each taxed at its own rate, makes clear that being in a bracket describes only your last dollar. Most of your income is taxed at rates well below the one people quote when they say what bracket they are in.

When to use it

Use it whenever a decision hinges on the marginal rate rather than the average one. Whether to make a traditional or Roth contribution, whether a side project is worth the extra tax, whether to accelerate income into this year or defer it into next, all turn on the rate that applies to the next dollar.

It is also the fastest way to disprove the raise myth for yourself or someone else. Run an income just below a bracket boundary and then just above it, and the total tax difference will be pennies rather than the cliff people imagine. Where genuine cliffs exist, they come from credits and subsidies that phase out, not from the bracket structure.

Understanding the inputs

Enter annual income before deductions. The calculator applies the standard deduction for a single filer automatically, so the taxable income it works from will be lower than the number you typed.

If you itemize, your taxable income will be lower still and the result here will overstate your tax. If you have pre-tax retirement contributions, subtract them before entering, since they reduce taxable wages. If you are married or filing as head of household, the bracket thresholds widen considerably and this single-filer model will overstate your liability, sometimes substantially, so treat it as an illustration of the mechanism rather than a personal estimate.

How is this calculated?

Progressive tax: only income within a specific range is taxed at that bracket's rate.

A worked example

Take a single filer with $150,000 of income. Using 2025 figures, a standard deduction of about $15,000 leaves $135,000 of taxable income, which is then sliced across four brackets rather than taxed at one rate.

The first $11,925 is taxed at 10 percent, giving $1,193. The next slice up to $48,475 is taxed at 12 percent, adding $4,386. The slice up to $103,350 is taxed at 22 percent, adding $12,073. The remaining $31,650 is taxed at 24 percent, adding $7,596. Total federal income tax is about $25,250. That is an effective rate of roughly 18.7 percent of taxable income and just under 17 percent of gross, despite the filer being described as in the 24 percent bracket.

Limitations and assumptions

This is an estimate, not tax advice, and the IRS is the authority. It models federal income tax for a single filer taking the standard deduction and nothing else. FICA, which is often the larger cost for middle incomes, is excluded, as is state and local income tax.

It applies no credits, and credits reduce tax dollar for dollar rather than reducing income, so the Child Tax Credit, education credits, or the Earned Income Tax Credit can change the outcome dramatically for eligible filers. Itemized deductions, the Alternative Minimum Tax, the Qualified Business Income deduction, and the separate schedule for long-term capital gains are all outside its scope. Rates and thresholds are indexed annually and set by legislation that changes, so verify current figures before relying on them.