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Federal Income Tax Calculator

Updated 2026

An income tax calculator helps you estimate your federal tax bill based on your income and filing status. Understand your effective and marginal tax rates and plan ahead for tax season.

How to Use This Calculator

Enter your annual gross income and select your filing status. The calculator applies the 2026 standard deduction and progressive tax brackets to compute your taxable income, total federal tax, effective tax rate, and marginal tax rate.

How It's Calculated

Taxable income = gross income − standard deduction (based on filing status). Tax is computed using progressive brackets: each portion of income is taxed at its corresponding rate. The effective tax rate is total tax divided by gross income. The marginal rate is the bracket your last dollar of income falls into.

Frequently Asked Questions

Your tax bracket is based on your taxable income and filing status. For 2026, the tax brackets for single filers are: 10% on income up to $11,925, 12% on income between $11,926 and $48,475, 22% on income between $48,476 and $103,350, and so on up to 37%. Your marginal tax bracket is the rate applied to your last dollar of income. For example, a single filer earning $80,000 taxable income is in the 22% bracket because their income falls within the $48,476–$103,350 range.
Your marginal tax rate is the percentage of tax applied to your last (highest) dollar of income — it determines your tax bracket. Your effective tax rate is your total tax divided by your total income — it's the average rate you actually pay. For example, a single filer with $100,000 taxable income might have a marginal rate of 22% but an effective rate of only about 14%. Many people mistakenly think their entire income is taxed at their marginal rate, which leads to overestimating their tax bill.
You should choose whichever reduces your taxable income the most. The standard deduction for 2026 is $15,000 for single filers and $30,000 for married couples filing jointly. Itemize if your total deductible expenses (mortgage interest, state and local taxes up to $10,000, charitable donations, and medical expenses exceeding 7.5% of AGI) exceed the standard deduction. For most people, the standard deduction is the better choice since the Tax Cuts and Jobs Act significantly increased it.
Common strategies to reduce taxable income include contributing to tax-deferred retirement accounts (401(k), Traditional IRA, HSA), using the standard deduction (or itemizing if it's larger), claiming the Child Tax Credit and other credits, harvesting investment losses to offset gains, and using Flexible Spending Accounts for healthcare and dependent care expenses. Tax-advantaged accounts are the most powerful tool — every dollar contributed to a 401(k) reduces your taxable income dollar-for-dollar.

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