Tax Calculator
Estimate your US federal income tax using 2024 tax brackets.
About this tool
A free, client-side US federal income tax estimator for the 2024 tax year. Enter your gross income, filing status (single, married filing jointly, married filing separately, or head of household), pre-tax deductions such as 401(k) and HSA contributions, and choose between the standard deduction or an itemized amount. The tool calculates your taxable income, breaks down the tax owed in each bracket, shows your total federal tax, effective tax rate, and marginal rate. A visual stacked bar illustrates how your income is divided among deductions, each bracket, and after-tax take-home. State taxes are not included. This tool is for estimation purposes only.
How to use
- 1 Select your filing status from the dropdown.
- 2 Enter your total gross income for 2024.
- 3 Enter any pre-tax deductions such as 401(k) contributions or HSA.
- 4 Choose Standard Deduction (automatically filled) or enter a custom itemized amount.
- 5 View the tax bracket breakdown table showing tax owed per bracket.
- 6 Review your total tax, effective rate, marginal rate, and take-home estimate.
How US federal income tax is actually calculated
The single biggest source of confusion about US income tax is the belief that earning more can push all your income into a higher bracket. It does not. The United States uses a progressive, marginal system: your income is sliced into bands, and each band is taxed at its own rate. Only the dollars that fall inside a given band are taxed at that band's rate. This tool models that mechanic exactly for the 2024 tax year, walking your money from gross income down to the tax owed in each bracket, then summarising your total tax, effective rate, and marginal rate.
The steps the calculator follows
- Start with gross income. Your total earnings before anything is removed.
- Subtract pre-tax deductions. 401(k) and HSA contributions come off the top to give Adjusted Gross Income (AGI). The tool caps these at the 2024 limits — $23,000 for a 401(k) and $4,150 for a self-only HSA — so you cannot accidentally over-deduct.
- Subtract your deduction. Either the standard deduction for your filing status or your itemized amount, whichever you choose. What remains is your taxable income.
- Apply the brackets. Taxable income is split across the seven 2024 bands and each slice is taxed at its rate.
The 2024 standard deductions built into the tool are $14,600 (single and married filing separately), $29,200 (married filing jointly), and $21,900 (head of household). The seven federal rates are 10%, 12%, 22%, 24%, 32%, 35%, and 37%, with the dollar thresholds varying by filing status.
A worked example
A single filer earns $75,000 gross, makes no 401(k) or HSA contribution, and takes the standard deduction. Taxable income is $75,000 − $14,600 = $60,400. That fills three brackets:
| Bracket | Income taxed here | Tax |
|---|---|---|
| 10% (0 – $11,600) | $11,600 | $1,160.00 |
| 12% ($11,600 – $47,150) | $35,550 | $4,266.00 |
| 22% ($47,150 – $60,400) | $13,250 | $2,915.00 |
| Total | $60,400 | $8,341.00 |
The total federal tax is $8,341. The tool reports two rates from this. The marginal rate is 22% — the bracket your last dollar landed in. The effective rate is 11.12% — total tax ($8,341) divided by gross income ($75,000). Because of the progressive structure, your effective rate is always lower than your marginal rate, which is why a "22% bracket" earner does not pay anything close to 22% of their income.
Why the two rates matter
Confusing these two numbers leads to bad decisions. Your marginal rate is what you should use when deciding whether an extra dollar is worth earning, or how much tax a $1,000 raise or a $1,000 deductible contribution affects — in the example above, contributing $1,000 to a 401(k) saves you $220 (22% of $1,000). Your effective rate is the honest measure of your overall tax burden and what you would quote to compare years. The stacked bar in the tool makes the whole picture visible at once: how your gross income divides into pre-tax deductions, the standard or itemized deduction, the tax taken by each bracket, and your after-tax take-home.
What this estimator does not include
- State and local income tax. These vary enormously — some states have none, others exceed 10% — and are not modeled here.
- FICA (Social Security and Medicare). The 7.65% payroll tax is separate from income tax and not included.
- Tax credits. The Child Tax Credit, education credits, and others reduce tax owed dollar-for-dollar but are not factored in.
- Capital gains. Long-term gains and qualified dividends are taxed at 0%, 15%, or 20%, not at these ordinary-income rates.
- AMT and other adjustments that apply to higher or more complex returns.
Practical tips
- Compare standard versus itemized. Switch the deduction toggle and watch your taxable income change. Itemizing only helps if your deductible expenses (mortgage interest, state taxes, charitable gifts) exceed the standard amount.
- See the value of pre-tax saving. Raise the 401(k) figure and your taxable income drops, lowering tax at your marginal rate — a concrete way to see why retirement contributions are tax-efficient.
- Treat the output as an estimate. Real returns involve credits, adjustments, and state rules. Use this to understand the mechanics and plan, then confirm with tax software or a professional.
Every calculation runs locally in your browser, so the income and contribution figures you enter are never transmitted or stored on a server.
Frequently Asked Questions
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