How this calculator works
The calculator applies the official 2025 IRS federal income tax brackets to your taxable income. Taxable income equals your total income minus pre-tax deductions (like 401(k) contributions) and either the standard deduction or your itemized deductions — whichever is larger.
Marginal vs effective rate — the difference that matters
Your marginal rate is the rate applied to your next dollar of income — the bracket your top dollar falls into. Your effective rate is your total tax divided by your total income, which is always lower because the lower brackets are taxed at lower rates. A common misconception is that getting a small raise can push you into a higher bracket and reduce your take-home pay — that is not how progressive taxation works. Only the income above each bracket threshold is taxed at the higher rate.
2025 standard deductions
- Single or married filing separately: $15,000
- Married filing jointly: $30,000
- Head of household: $22,500
What this calculator does NOT include
This is a federal-only estimator. It does not account for state income tax, FICA (Social Security and Medicare, which add 7.65% for employees), capital gains, the Alternative Minimum Tax, or tax credits like the Child Tax Credit or Earned Income Tax Credit. For a complete picture, pair this result with our Self-Employment Tax Calculator if you have 1099 income.
The results shown here are estimates for educational purposes only and should not be filed as a tax return. Always consult a licensed tax professional for advice specific to your situation.
Frequently asked questions
What is the difference between marginal and effective tax rate?
Your marginal tax rate is the rate applied to your next dollar of income — the bracket your top dollar falls into. Your effective tax rate is your total tax divided by your total income, which is always lower because lower brackets are taxed at lower rates. A $100,000 earner in the 24% bracket might have an effective rate of only 17%.
Does this calculator include state income tax?
No. This calculator estimates federal income tax only. State income tax rates range from 0% (Texas, Florida, Washington, Nevada, South Dakota, Wyoming, Alaska) to over 13% (California top marginal rate). Add your state's rate to get your total tax burden.
Should I take the standard deduction or itemize?
Take whichever is larger. For 2025, the standard deduction is $15,000 (single), $30,000 (married filing jointly), or $22,500 (head of household). Itemize only if your total of mortgage interest, SALT taxes (capped at $10,000), charitable contributions, and medical expenses above 7.5% of AGI exceeds these amounts. About 90% of taxpayers now take the standard deduction.
How accurate is this calculator?
This calculator uses official 2025 IRS brackets and standard deductions. It does NOT account for tax credits (Child Tax Credit, Earned Income Credit, education credits), capital gains, AMT, self-employment tax, or NIIT. For a complete picture, use tax software or consult a CPA.
What is the Additional Medicare Tax?
High earners owe an extra 0.9% Medicare tax on wages/self-employment income above $200,000 (single) or $250,000 (married filing jointly). Employers do not match this portion. This calculator does not include this surtax.
Can getting a raise actually reduce my take-home pay?
No. The US uses a progressive tax system — only income above each bracket threshold is taxed at the higher rate. A raise from $95,000 to $105,000 only pushes the $10,000 above $103,350 into the 24% bracket; the rest stays at 22%. Your take-home always increases with a raise.
What tax credits am I missing out on?
Commonly-overlooked credits include the Saver's Credit (up to $1,000 for retirement contributions if income under $38,750 single), Child and Dependent Care Credit (up to $1,050 per child for childcare expenses), and Lifetime Learning Credit (up to $2,000 for education expenses). Credits reduce tax dollar-for-dollar, unlike deductions.
Glossary of key terms
- AGI (Adjusted Gross Income)
- Your gross income minus above-the-line deductions like 401(k) contributions, HSA contributions, and student loan interest. Most tax calculations start from AGI.
- Standard Deduction
- A flat dollar amount you can subtract from your income without itemizing. For 2025: $15,000 single, $30,000 married filing jointly.
- Taxable Income
- AGI minus either the standard deduction or your itemized deductions, whichever is larger. This is the number the bracket rates are applied to.
- FICA
- Federal Insurance Contributions Act — the 7.65% payroll tax (6.2% Social Security + 1.45% Medicare) withheld from wages, matched by employers.
- Withholding
- Money your employer sends to the IRS on your behalf throughout the year, based on the W-4 form you complete. Adjust your W-4 if you consistently owe or get large refunds.
Common mistakes to avoid
- Confusing marginal and effective rates — a 24% marginal rate does NOT mean you pay 24% of your income in tax
- Forgetting that bonuses and commission are withheld at a flat 22% federal rate, which often over-withholds
- Not adjusting W-4 after major life events (marriage, child, second job, side income)
- Assuming state tax is included — it's not, and state rates range from 0% to 13.3%
- Ignoring tax credits, which are worth more than deductions because they reduce tax dollar-for-dollar
Pro tips
- If you got a large refund last year, you gave the government an interest-free loan. Adjust your W-4 to increase take-home pay throughout the year and invest the difference.
- Contribute to a traditional 401(k) or IRA to reduce taxable income dollar-for-dollar. A $7,000 IRA contribution saves $1,680 in tax at the 24% bracket.
- Bunch deductions — alternate years between taking the standard deduction and itemizing (prepay mortgage, accelerate charitable giving in itemizing years).
- Tax-loss harvest in taxable brokerage accounts to offset up to $3,000 of ordinary income each year, plus unlimited capital gains.
- If self-employed, open a Solo 401(k) or SEP-IRA — you can contribute up to $70,000 in 2025, dramatically reducing taxable income.