onlinecalculator.me

Free online income tax calculator

Federal income tax is what the IRS takes from your paycheck. This calculator estimates what you'll owe using 2024 US brackets, the standard deduction, and FICA.

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Total tax
$—
Effective rate: —%
Federal income tax
$—
Marginal: —%
After-tax income
$—
$—/month
Social Security
$—
6.2% on ≤ $168,600
Medicare
$—
1.45% + 0.9% over threshold
AGI: $—
Deduction: $—
Taxable income: $—
About this calculator

How to use

  1. Enter your gross income and filing status.
  2. Switch to Extended mode to add 401(k) contributions, other income, or itemized deductions.
  3. Check “Self-employed” if you work for yourself.
  4. Read total tax, effective rate, bracket-by-bracket breakdown, and after-tax income.

2024 standard deductions

Filing statusStandard deduction
Single$14,600
Married filing jointly$29,200
Married filing separately$14,600
Head of household$21,900
Qualifying surviving spouse$29,200

How federal tax is calculated

Taxable income = gross income + other income − 401(k) − deduction

Tax is then applied progressively: you pay the bracket rate only on income within that bracket, not on all your income.

Example (single, $75,000 gross, standard deduction):

  • Taxable income: $75,000 − $14,600 = $60,400
  • 10% on first $11,600 = $1,160
  • 12% on $11,601–$47,150 = $4,266
  • 22% on $47,151–$60,400 = $2,915
  • Federal income tax: $8,341

FICA (2024)

  • Social Security: 6.2% on wages up to $168,600
  • Medicare: 1.45% on all wages, plus 0.9% on wages above $200,000 (single) / $250,000 (married)

Notes

  • Source: IRS Rev. Proc. 2023-34; IRS Publication 15 (2024).
  • State income tax, AMT, tax credits, and investment income (long-term capital gains, qualified dividends) are not included.
  • This tool is for estimation. Consult a tax professional for filing.

Frequently asked

What tax year does this calculator cover?
Tax year 2024. Brackets and standard deductions are from IRS Rev. Proc. 2023-34.
What is included in the total tax?
Federal income tax (progressive brackets), Social Security (6.2% on income up to $168,600), and Medicare (1.45% base plus 0.9% additional on income over $200,000 single / $250,000 married). If self-employed is checked, a 15.3% self-employment tax on 92.35% of income is added.
What is the standard deduction for 2024?
$14,600 for single filers and married filing separately; $29,200 for married filing jointly and qualifying surviving spouse; $21,900 for head of household.
What are the 2024 federal tax brackets for single filers?
10% on income up to $11,600; 12% up to $47,150; 22% up to $100,525; 24% up to $191,950; 32% up to $243,725; 35% up to $609,350; 37% on income above $609,350.
What is the effective tax rate?
Effective rate = total tax (federal + FICA + SE) / gross income. This is a truer cost-of-income measure than the marginal rate, which only applies to the last dollar earned.
Does this include state income tax?
No — state income tax varies widely and is not included. The calculator covers federal taxes only.