Income Tax Calculator
This income tax calculator estimates how much federal income tax you would owe in the United States — it models the US federal system specifically, using the 2024 tax brackets and standard deduction, and is not built for the UK, India, or any other country's tax code. Enter your filing status and gross annual income to see your estimated total federal tax, marginal tax rate, effective tax rate, and after-tax income, along with a breakdown of how much tax falls into each bracket.
Your tax details
We assume you take the standard deduction — itemizing is out of scope for this estimate.
How progressive tax brackets actually work
The US federal income tax system is progressive, which means your income is sliced into chunks and each chunk is taxed at its own rate — it does not mean your entire income is taxed at whatever rate matches your top dollar. Picture your taxable income filling a stack of buckets from the bottom up: the first bucket is taxed at the lowest rate, and only once it is completely full does any income spill into the next bucket, which carries a higher rate. You keep filling buckets, at progressively higher rates, until you run out of income. The rate on that last, partially-filled bucket is your marginal rate — but it only applies to the slice inside that bucket, not to everything below it.
The calculation this tool performs
First, the calculator subtracts the 2024 federal standard deduction for your filing status from your gross income to estimate your taxable income:
taxable income = max(0, gross income − standard deduction)
For the 2024 tax year, the standard deduction is $14,600 for single filers and $29,200 for those married filing jointly. This calculator assumes you take the standard deduction rather than itemizing — if you itemize, your taxable income (and your tax) will differ from this estimate. From there, the tool walks your taxable income through the relevant bracket table — the single brackets or the married-filing-jointly brackets — taxing only the portion of income that falls within each band:
tax += (min(taxable income, bracket cap) − previous cap) × rate
That step repeats for every bracket your taxable income reaches. Summing each bracket's contribution gives the total federal tax owed; dividing that total by your taxable income gives your effective tax rate; and the rate on the last (highest) bracket you reach is your marginal rate. After-tax income, as shown here, is simply your gross income minus this estimated federal tax — it intentionally leaves out every other deduction from your paycheck.
Worked example — a single filer earning $75,000
Suppose you file as single and earn $75,000 in gross income. Subtracting the 2024 single standard deduction of $14,600 leaves a taxable income of $60,400. Walking that amount through the single brackets fills three buckets: the first $11,600 is taxed at 10% ($1,160.00), the next $35,550 (from $11,600 up to $47,150) is taxed at 12% ($4,266.00), and the remaining $13,250 (from $47,150 up to your $60,400 taxable income) is taxed at 22% ($2,915.00). Adding those three slices gives an estimated total federal tax of $8,341.00.
Because the last dollar of taxable income landed in the 22% bracket, your marginal tax rate is 22% — but your effective tax rate (total tax ÷ taxable income) works out to roughly 13.81%, well below your marginal rate, because the lower brackets pulled that average down. Measured against your full $75,000 of gross income instead, the same $8,341.00 amounts to about 11.12% — a useful reminder that "what rate do I pay" depends heavily on which base you measure against. Subtracting the estimated tax from gross income gives an after-tax (from-this-tax-only) figure of $66,659.00. Try the same $75,000 with "married filing jointly" selected in the calculator above to see how much the wider brackets and larger standard deduction change the result.
Marginal vs. effective tax rate
These two figures answer different questions, and mixing them up is the source of most "I don't want a raise because it'll push me into a higher bracket" confusion. Your marginal rate answers "what rate applies to my next dollar of income?" — useful for thinking about a raise, a bonus, or whether an extra freelance gig is worth it after tax. Your effective rate answers "what share of my income did I actually pay in tax, on average?" — the more honest measure of your overall burden, and the one to use when comparing your tax bill year over year or against someone else's. A higher marginal rate on your last slice of income never reduces what you keep from the slices below it; it only ever applies going forward, dollar by dollar, from the threshold upward.
What this calculator leaves out — and why that matters
Income tax is a high-stakes, easy-to-get-wrong topic, so it is worth being explicit about the corners this simplified model cuts. It estimates only the US federal income tax using the 2024 brackets and the standard deduction for Single or Married Filing Jointly status. It does not include:
- State and local income taxes — these vary enormously by location, from none at all to well over 10%.
- FICA payroll taxes — Social Security and Medicare withholding, plus any additional Medicare surtax at higher incomes.
- Self-employment tax — if you freelance or run a business, you owe both the employer and employee shares of FICA.
- Tax credits — such as the Child Tax Credit or Earned Income Tax Credit, which reduce your bill dollar-for-dollar and can be substantial for many households.
- Itemized deductions — mortgage interest, charitable giving, large medical expenses, and more, for filers who don't take the standard deduction.
- Income taxed at special rates — long-term capital gains and qualified dividends follow their own bracket structure, separate from ordinary income.
- The alternative minimum tax and other edge cases — which can apply to higher-income filers in specific situations.
It is also worth repeating plainly: this page models only the United States federal system. Taxpayers in the UK, India, and most other countries operate under entirely different bands, allowances, and filing rules that this tool does not attempt to represent — using it to estimate a non-US tax bill would not be meaningful.
Disclaimer
This calculator provides an estimate only and is not tax, legal, or financial advice. It models a simplified version of the 2024 US federal income tax brackets and standard deduction for Single and Married Filing Jointly status, and assumes you take the standard deduction rather than itemizing. It excludes state and local taxes, payroll (FICA) taxes, self-employment tax, tax credits, itemized deductions, capital gains and other specially-taxed income, and the alternative minimum tax — all of which can materially change what you actually owe. Tax law and bracket thresholds change every year, so figures shown here will not match a future or prior tax year. Use this tool for rough, ballpark planning only — for your actual filing, consult the IRS or a qualified tax professional.
Frequently asked questions
- How does this income tax calculator work?
- Enter your filing status and gross annual income. The calculator subtracts the 2024 federal standard deduction for your filing status to estimate your taxable income, then walks that amount through the progressive federal tax brackets to estimate your total federal tax owed, marginal tax rate, effective tax rate, and after-tax income.
- Do I pay my top tax rate on all of my income?
- No — this is one of the most common misunderstandings about taxes. The US uses a progressive bracket system, so each slice of your taxable income is taxed at the rate for that slice only, not your whole income at your highest rate. Someone in the 22% bracket still pays just 10% on their first dollars and 12% on the next slice, and only the portion above the 22% threshold (if any) is taxed at 22%.
- What is the difference between my marginal and effective tax rate?
- Your marginal tax rate is the rate applied to your last dollar of taxable income — the bracket your top slice falls into. Your effective tax rate is your total tax divided by your taxable income, expressed as a percentage, which blends every bracket you passed through. The effective rate is almost always lower than the marginal rate, and it is the more accurate measure of your overall tax burden.
- What is the standard deduction and how does it lower my taxes?
- The standard deduction is a flat amount the IRS lets most filers subtract from their gross income before calculating tax, so you are taxed on a smaller "taxable income" figure rather than your full earnings. For the 2024 tax year it is $14,600 for single filers and $29,200 for those married filing jointly. This calculator assumes you take the standard deduction; if you itemize deductions instead, your taxable income — and therefore your tax — will differ from this estimate.
- How does my filing status change my tax bill?
- Filing status determines both your standard deduction and the income thresholds at which each tax rate kicks in. Married filing jointly brackets are roughly double the single brackets at the lower and middle rates, which is why two people who each earn the same amount can owe a different combined total depending on whether they file separately or jointly. This calculator currently models Single and Married Filing Jointly only.
- What does this calculator NOT include?
- This estimate covers only federal income tax under the simplified 2024 brackets and the standard deduction. It excludes state and local income taxes, FICA payroll taxes (Social Security and Medicare), self-employment tax, the alternative minimum tax, tax credits such as the Child Tax Credit or Earned Income Tax Credit, itemized deductions, and income taxed at special rates such as long-term capital gains or qualified dividends. Your actual federal liability — and certainly your total tax burden — will differ from the figure shown here.
- Why do the tax brackets change every year?
- The IRS adjusts bracket thresholds and the standard deduction annually for inflation so that cost-of-living increases in your paycheck do not silently push you into a higher bracket on purchasing power you have not actually gained — an effect often called "bracket creep." This calculator uses the 2024 figures; always check irs.gov for the brackets that apply to the tax year you are actually filing for.
- Is this calculator accurate enough to file my taxes with?
- No. This tool is meant for quick, ballpark planning — for example, estimating how a raise or a new job offer might change your take-home pay. It is not a substitute for tax preparation software or a qualified tax professional, both of which account for credits, deductions, additional income types, and the latest rules that this simplified model leaves out.
- Does this calculator cover UK, Indian, or other countries’ income tax?
- No. This page models only the United States federal income tax system. The United Kingdom, India, and most other countries use entirely different tax bands, allowances, and rules, so the figures here would not be meaningful for those systems. If you need a non-US estimate, look for a calculator built specifically around that country’s tax code.
- What counts as "gross income" in this calculator?
- Treat it as your total annual income before any taxes or deductions are taken out — for most W-2 employees, that is your annual salary or wages. The calculator then applies the standard deduction for you to arrive at taxable income, so you should not subtract deductions yourself before entering a number.