Income Tax Calculator
Estimate your income tax based on US federal tax brackets (2024). Calculate effective tax rate.
US Federal Income Tax 2024. Estimates only — does not include state taxes, deductions, or credits.
What Is the Income Tax Calculator?
The Income Tax Calculator estimates your federal income tax liability based on your taxable income and filing status using current tax brackets. It shows the tax owed at each bracket, your effective (average) tax rate, and your marginal rate — the rate on your next dollar of income.
Formula
How to Use
Enter your annual gross income, filing status (single, married filing jointly, etc.), and applicable deductions (standard or itemized). The calculator applies the current tax brackets progressively, shows tax owed at each bracket level, and displays your total tax, effective rate, and after-tax income.
Example Calculation
Single filer, $85,000 taxable income (2024 brackets): 10% on first $11,600 = $1,160. 12% on $11,601−$47,150 = $4,266. 22% on $47,151−$85,000 = $8,327. Total tax = $13,753. Effective rate = 16.2%. Marginal rate = 22%.
Understanding Income Tax
Income tax is calculated progressively in the US — different portions of your income are taxed at different rates. Understanding how tax brackets work is critical for financial planning, retirement withdrawal strategy, Roth conversion decisions, and evaluating the tax impact of raises, bonuses, and investment income.
A common misconception is that earning more money can put you in a 'higher bracket' and leave you with less take-home pay. This is impossible in a progressive system: only the income above the threshold is taxed at the higher rate, and the extra income always increases take-home pay. However, higher marginal rates do mean a smaller fraction of incremental income is kept.
Tax planning strategies — maximizing pre-tax retirement contributions (401k, HSA, traditional IRA), timing income recognition, optimizing capital gains rates, and understanding the marriage penalty/bonus — can dramatically reduce your effective tax rate. The tax system rewards informed planning, making a solid understanding of brackets and rates a high-value financial skill.
Frequently Asked Questions
What is the difference between marginal and effective tax rate?
Marginal rate is the rate applied to your last dollar of income — the rate on income in your highest bracket. Effective rate is total tax ÷ total income — your average rate across all brackets. Effective rates are always lower than marginal rates in a progressive system.
What is a progressive tax system?
In a progressive system, higher incomes are taxed at higher rates. Critically, only income in each bracket is taxed at that bracket's rate — not all income. Moving into a higher bracket doesn't mean all income is taxed at that higher rate.
What is the standard deduction?
The standard deduction reduces your taxable income before applying brackets. For 2024: Single: $14,600, Married Filing Jointly: $29,200, Head of Household: $21,900. If itemized deductions exceed the standard deduction, itemizing reduces tax more.
Does this calculator include state taxes?
This calculator focuses on federal income tax. State income taxes vary widely: some states have no income tax (TX, FL, NV), others have flat rates (PA at 3.07%), and some have progressive rates up to 13.3% (CA).
Is this calculator free?
Yes, completely free with no account required.