Income Tax Calculator

What Is an Income Tax Calculator?

An income tax calculator estimates how much federal tax you owe based on your annual income and filing status. The United States uses a progressive tax system, meaning your income is divided into brackets, and each bracket is taxed at a different rate. Only the income within each bracket is taxed at that bracket's rate — not your entire income.

This calculator uses the official 2024 federal tax brackets published by the IRS. It applies the standard deduction by default, which reduces your taxable income before the bracket rates apply. For most taxpayers, the standard deduction is the best option unless your itemized deductions (mortgage interest, charitable donations, state taxes) exceed the standard amount.

Understanding your tax bracket helps with financial planning, retirement contributions, and deciding whether to accelerate or defer income. Use this tool to see exactly how much of your income falls into each bracket and what your true effective tax rate is.

Frequently Asked Questions

What is the difference between marginal and effective tax rate?

Your marginal tax rate is the rate applied to your last dollar of income — the highest bracket your income reaches. Your effective tax rate is your total tax divided by your total income, representing the average rate you actually pay across all brackets. For example, a single filer earning $75,000 has a 22% marginal rate but pays an effective rate of only about 11-12%. The effective rate is always lower because lower portions of income are taxed at lower rates.

How do tax brackets work?

Tax brackets are ranges of income taxed at progressively higher rates. The US has seven brackets: 10%, 12%, 22%, 24%, 32%, 35%, and 37%. A common misconception is that moving into a higher bracket means all your income is taxed at the higher rate. In reality, only the income above the bracket threshold is taxed at the new rate. The bracket breakdown table above shows exactly how this works for your income.

Does this calculator include state income tax?

No, this calculator estimates federal income tax only. State income tax varies widely — seven states (Alaska, Florida, Nevada, South Dakota, Tennessee, Texas, Wyoming) have no state income tax, while California's top rate is 13.3%. You'll need to account for state tax separately for a complete picture of your total tax burden.

What filing status should I choose?

Choose Single if you are unmarried or legally separated. Choose Married Filing Jointly if you are married and want to combine incomes on one return, which typically results in the lowest tax bill. Choose Head of Household if you are unmarried but pay more than half the cost of maintaining a home for a qualifying dependent — this status offers wider brackets and a larger standard deduction than Single.

Are these the 2024 tax brackets?

Yes, this calculator uses the 2024 federal income tax brackets as published by the IRS. The bracket thresholds are adjusted annually for inflation, though the rates themselves (10% through 37%) have remained unchanged since the Tax Cuts and Jobs Act of 2017. The standard deduction amounts are also updated each year — for 2024, they are $14,600 for Single, $29,200 for Married Filing Jointly, and $21,900 for Head of Household.

Example Calculation

Let's calculate the federal income tax for a single filer earning $85,000 per year with the standard deduction:

• Gross income: $85,000
• Standard deduction: $14,600
• Taxable income: $70,400
• 10% on first $11,600 = $1,160
• 12% on $11,601 – $47,150 = $4,266
• 22% on $47,151 – $70,400 = $5,115
• Total federal tax: $10,541
• Effective tax rate: 12.40%
• Marginal tax rate: 22%
• Take-home pay (federal only): $74,459

Even though this person is in the 22% bracket, their effective rate is only 12.40% because the first $11,600 of taxable income is taxed at just 10% and the next $35,550 at 12%. This is why understanding the difference between marginal and effective tax rates is so important — your actual tax burden is almost always lower than your bracket suggests.