Income Tax Estimator
How It Works
The United States federal income tax system is progressive — meaning higher portions of your income are taxed at higher rates as you earn more. Understanding how this system works is essential for accurate financial planning, salary negotiation, and evaluating whether deductions or retirement contributions make sense for your situation.
Your federal tax is calculated on taxable income, not gross income. The standard deduction — $16,100 for single filers in 2026 — is subtracted from gross income before any tax is calculated. This means a single filer earning $75,000 pays taxes on approximately $58,900, not $75,000. This distinction is often misunderstood and leads people to overestimate their tax burden.
Tax brackets are marginal, not flat rates. Being in the 22% tax bracket does not mean you pay 22% on all your income. It means only the income within the 22% bracket is taxed at 22%. Your first $12,400 of taxable income is taxed at 10%, the next portion at 12%, and only the income above $50,400 reaches the 22% bracket. This is a critical concept: earning a raise that pushes you into a higher bracket only raises taxes on the incremental dollars above that threshold.
Your filing status significantly affects your tax liability. Married couples filing jointly receive a standard deduction of $32,200 and benefit from wider tax brackets — in most cases substantially reducing their combined tax compared to filing separately. Head of Household status (for qualifying single parents) provides a higher standard deduction and more favorable brackets than single filer status.
This estimator calculates federal income tax only, using 2026 IRS brackets and the standard deduction. It does not include state income taxes, FICA (Social Security and Medicare) taxes, self-employment taxes, the Net Investment Income Tax, or the Alternative Minimum Tax. For a complete tax picture, use the Take-Home Pay calculator.
Formula Breakdown
Federal income tax is calculated using progressive marginal brackets applied to taxable income: 1. Taxable Income = Gross Income − Standard Deduction (2026 standard deductions: Single/MFS = $16,100 | MFJ = $32,200 | HOH = $24,150) 2. Apply 2026 tax brackets (Single filer example): - 10% on taxable income $0 – $12,400 - 12% on taxable income $12,401 – $50,400 - 22% on taxable income $50,401 – $105,700 - 24% on taxable income $105,701 – $201,775 - 32% on taxable income $201,776 – $256,225 - 35% on taxable income $256,226 – $640,600 - 37% on taxable income over $640,600 3. Effective Rate = Federal Tax ÷ Gross Income × 100 Example: Single filer, $80,000 gross income: - Taxable income = $80,000 − $16,100 = $63,900 - 10% on $12,400 = $1,240 - 12% on $38,000 ($50,400 − $12,401) = $4,560 - 22% on $13,500 ($63,900 − $50,400) = $2,970 - Total federal tax = $8,770 - Effective rate = $8,770 ÷ $80,000 = 11.0% - Marginal rate = 22%
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