Tax Calculators
Tax calculators to estimate federal income tax, effective and marginal rates, and deductions.
Federal income tax is progressive, which means it is assembled in layers rather than charged at a single rate — and that is the source of most confusion about it. Being in a given bracket does not mean paying that percentage on everything you earn; it means the last portion of your income is taxed at that rate while everything beneath it is taxed at the lower rates along the way. The calculator here makes that structure visible, showing the tax owed bracket by bracket alongside the effective rate that actually describes your burden.
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- CentCompass
- Last Updated
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- 1 min read
Calculators
When to use each calculator
- Federal Income Tax Calculator
- Use it to estimate federal income tax on ordinary income, see which bracket your last dollar falls in, and compare that marginal rate against your effective rate.
- Paycheck Calculator
- Use it when you want income tax and payroll tax together. FICA is charged on gross wages and sits outside income tax entirely, so the paycheck view is the fuller picture.
- Salary Calculator
- Use it to see the annual tax burden expressed as take-home pay across pay frequencies, which is often more useful than the tax figure on its own.
Choosing between them
Marginal or effective rate?
The marginal rate is what applies to your next dollar and drives decisions about extra income or deductions. The effective rate is total tax divided by total income and describes your actual burden. The effective rate is always the lower of the two, usually by a wide margin.
Income tax or payroll tax?
They are separate systems. Income tax applies to taxable income after the standard deduction using progressive brackets. FICA applies to gross wages at a flat rate, with Social Security stopping at an annual wage base and Medicare continuing on every dollar.
Standard deduction or itemising?
Itemise only when your deductible expenses exceed the standard deduction. Because the standard deduction is substantial, the large majority of filers do better taking it — and this calculator models that case.
Guides
- Tax Brackets ExplainedHow US federal tax brackets actually work, why moving into a higher bracket never cuts your take-home pay, and how to read the rate schedule.
- Marginal Tax Rate vs Effective Tax RateTwo numbers describe your tax bill and they answer different questions. Here is which to use for decisions and which describes what you actually pay.
Explore more
Browse every calculator on the site, read our financial guides, or see how CentCompass is built and reviewed.
Frequently asked questions
Which tax year do these figures use?
The brackets and standard deduction come from our dated registry of IRS figures, which records the effective tax year and the source publication. The data sources page lists each dataset and its review status.
Does being in a higher bracket mean all my income is taxed at that rate?
No. Only the income that falls inside that bracket is taxed at its rate; everything below is taxed at the lower rates. This is why your effective rate is always lower than your marginal rate.
Are Social Security and Medicare included?
Not in the income tax calculator — those FICA taxes are separate and apply to gross wages rather than taxable income. Use the paycheck calculator to see both together.
What is not covered?
State and local income taxes, itemized deductions, tax credits, the Alternative Minimum Tax, self-employment tax, and the preferential rates on long-term capital gains and qualified dividends.
What is the difference between a deduction and a credit?
A deduction reduces the income being taxed, so its value equals the deduction times your marginal rate. A credit reduces the tax bill itself dollar for dollar, making it considerably more valuable per dollar.
Sources
- IRS — Federal income tax rates and brackets
- IRS — Topic no. 501, Should I itemize?
- IRS — Publication 17, Your Federal Income Tax
How this page is produced
Editorial process. CentCompass is maintained independently, and this page is written and checked against the official publications listed above before it goes live. There is no separate editorial reviewer. This page was last checked on . See our editorial policy.
How the calculations work. Every result comes from a small, unit-tested calculation engine rather than a spreadsheet or a hardcoded table. Loans use the standard amortization formula, growth uses compound-interest math, income tax applies the federal progressive brackets, and payroll applies Social Security and Medicare rules. Our methodology sets out each one.
Where the figures come from. Tax brackets, standard deductions, FICA parameters, and contribution limits are stored once in a dated registry and read directly by the calculators — the same values appear in the text above, so the two can never drift apart. Each figure records its source, effective tax year, and review status on our data sources page.
Update policy. Regulatory figures are checked against their primary source when the IRS, SSA, or another authority publishes new values — typically each autumn for the following tax year — and again at the scheduled review date recorded for each dataset. Figures that have not been checked yet are marked as draft on the data sources page until that check is complete.
Educational purposes only — not financial, tax, or investment advice (disclaimer).