About the Income Tax Calculator
An income tax calculator estimates US federal tax liability from taxable income and filing status, applying the progressive bracket structure. Understanding how brackets actually work resolves the most persistent misconception in personal tax.
The formula
Tax = Σ (income within each bracket · that bracket rate)Only the income falling within each bracket is taxed at that bracket's rate. Your marginal rate applies to the last dollar earned; your effective rate is total tax divided by total income.
How to use this calculator
- 1Enter your Taxable Income ($). The field starts at
75000, which you can overwrite. - 2Enter your Filing Status (1=Single, 2=Married Joint). The field starts at
1, which you can overwrite. - 3Read the result straight away — it recalculates as you type, so there is no button to press. Use Share to copy a link that reopens the page with your exact numbers filled in.
Worked example
| Input | Value |
|---|---|
| Taxable Income ($) | 75000 |
| Filing Status (1=Single, 2=Married Joint) | 1 |
Result
Federal Tax: $11,553.00
Effective Rate: 15.40%
After-Tax Income: $63,447.00
Those are the values the page loads with, so you can reproduce this result yourself and then change one field at a time to see what drives the outcome.
Understanding your result
Moving into a higher bracket never reduces your take-home pay. If the 22 percent bracket begins at 47,150, only the income above that figure is taxed at 22 percent — everything below is still taxed at 10 and 12 percent. Earning one dollar more never costs more than that dollar in tax.
This is why the effective rate is always well below the marginal rate. Someone in the 22 percent bracket typically has an effective federal rate around 12 to 15 percent once the lower brackets and the standard deduction are accounted for. The marginal rate matters for decisions about additional income; the effective rate describes what you actually pay.
Things worth knowing
- This estimates federal tax only. State and local income taxes, where applicable, are additional.
- Taxable income is gross income minus the standard or itemised deduction, not gross income itself.
- Pre-tax retirement contributions reduce taxable income directly, effectively at your marginal rate.
- Tax credits reduce tax owed dollar for dollar and are worth considerably more than deductions of the same size.
- Capital gains and qualified dividends are taxed on a separate, lower schedule.
Frequently asked questions
How do tax brackets work?+
Progressively. Each rate applies only to the income within that bracket, so moving into a higher bracket raises the rate on the additional income only, never on what you already earned.
Will a raise push me into a higher bracket and cost me money?+
No. Only the portion above the threshold is taxed at the higher rate. Earning more always leaves you with more after tax under a progressive system.
What is the difference between marginal and effective rate?+
Marginal is the rate on your next dollar of income; effective is total tax divided by total income. The effective rate is always lower, often by several percentage points.
What is the difference between a deduction and a credit?+
A deduction reduces taxable income, so it saves tax at your marginal rate. A credit reduces the tax bill directly, so a 1,000 dollar credit saves 1,000 dollars regardless of bracket.