Federal Income Tax Calculator

Estimate your federal income tax liability for 2025 or 2026 based on your income, filing status, and deductions. This calculator uses official IRS tax brackets.

📅 Tax Year:

🧮 Calculate Your Tax

$
Total income before deductions
$
Leave blank to use standard deduction
Additional deduction for 65+ or blind

How It Works

The federal income tax system in the United States uses a progressive tax structure, meaning your income is taxed at increasing rates as it rises through different brackets. This calculator applies the official IRS tax brackets for the selected tax year.

The Calculation Process

  1. Start with Gross Income: Your total income from all sources (wages, investments, etc.)
  2. Subtract Deductions: Either the standard deduction for your filing status or your itemized deductions (whichever is greater)
  3. Calculate Taxable Income: Gross Income − Deductions = Taxable Income
  4. Apply Tax Brackets: Each portion of income is taxed at its corresponding bracket rate

Tax Bracket Formula

Your tax is calculated by applying each bracket's rate only to the income within that bracket:

Total Tax = (Income in 10% bracket × 0.10)
          + (Income in 12% bracket × 0.12)
          + (Income in 22% bracket × 0.22)
          + ... and so on

For example, a single filer with $75,000 taxable income in 2026 would pay:

  • 10% on the first $12,150 = $1,215
  • 12% on $12,150 to $49,475 = $4,479
  • 22% on $49,475 to $75,000 = $5,615.50
  • Total: $11,309.50

Examples

Example 1: Single Filer, $60,000 Income

  • Gross Income: $60,000
  • Standard Deduction (2026): $15,350
  • Taxable Income: $44,650
  • Tax: $1,215 + $3,900 = $5,115
  • Effective Rate: 8.5%

Example 2: Married Filing Jointly, $150,000 Income

  • Gross Income: $150,000
  • Standard Deduction (2026): $30,700
  • Taxable Income: $119,300
  • Tax: $2,430 + $8,958 + $4,477 = $15,865
  • Effective Rate: 10.6%

Frequently Asked Questions

Your marginal tax rate is the rate applied to your last dollar of income (your highest bracket). Your effective tax rate is your total tax divided by total income, representing the average rate you actually pay. The effective rate is always lower than the marginal rate due to progressive taxation.
Use whichever is larger. Most taxpayers benefit from the standard deduction, which has increased significantly in recent years. Itemizing may be better if you have large mortgage interest, state/local taxes, charitable donations, or medical expenses. Use our Standard vs Itemized calculator to compare.
No, this calculator estimates federal income tax only. State income taxes vary widely—some states have no income tax, while others have rates up to 13%. Use our State Income Tax calculator for state estimates.
FICA taxes are separate from income tax. They're typically 7.65% of wages (6.2% Social Security + 1.45% Medicare), with employers matching this amount. Use our FICA Calculator for these calculations.
Taxpayers who are 65 or older, or who are blind, receive an additional standard deduction. For 2026, this is $2,050 for single/HOH filers and $1,650 for married filers, per qualifying condition. A married couple where both spouses are 65+ would add $3,300.
This calculator provides a reasonable estimate using official IRS brackets and standard deductions. However, it doesn't account for all tax credits, adjustments to income, AMT, or complex situations. Always verify with IRS publications or a tax professional for your actual return.

Use Cases

  • Pre-filing check: Estimate how much you'll owe (or get back) before you file your return.
  • W-4 adjustment: See how a change in filing status or deductions affects your annual tax to set the right withholding.
  • Side-income planning: Add freelance or investment income to your wages to see the combined federal tax impact.
  • Retirement distribution planning: Estimate the tax hit of taking a 401(k) or IRA distribution at various income levels.
  • Year-over-year comparison: Switch between 2025 and 2026 to see how inflation-adjusted brackets change your tax.

Assumptions & Limitations

  • This calculator uses the standard deduction unless you enter a custom deduction amount that exceeds it.
  • It does not include the Alternative Minimum Tax (AMT), tax credits (Child Tax Credit, EITC, etc.), or qualified business income deduction (Section 199A).
  • Capital gains, dividends, and other investment income are not modeled here — use the Capital Gains Calculator for those.
  • FICA taxes (Social Security and Medicare) are not included — see the FICA Calculator or Paycheck Calculator.
  • State and local income taxes are separate — use the State Income Tax Calculator.
  • Results are estimates for planning purposes. Tax laws change; always verify current IRS rules and consult a qualified tax professional when needed.

Sources & References

  • IRS Revenue Procedure 2025-11 — 2026 tax year inflation adjustments for brackets and standard deductions
  • IRS Publication 17 — Your Federal Income Tax (general rules for individual filers)
  • IRS Form 1040 Instructions — Line-by-line guidance for the individual income tax return
  • IRS Topic No. 551 — Standard Deduction amounts
  • IRS Publication 501 — Dependents, Standard Deduction, and Filing Information
  • 26 U.S. Code § 1 — Tax imposed (statutory tax rate schedule)

Rates and limits reflect IRS guidance current as of January 2026. Verify at irs.gov.

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