Income Tax Calculator

Take a single filer earning $85,000 in 2025. Subtracting the $15,000 standard deduction leaves $70,000 of taxable income. The 2025 brackets are applied in slices: 10% on the first $11,925 ($1,192.50), 12% on the next $36,550 up to $48,475 ($4,386.00), and 22% on the remaining $21,525 ($4,735.50). That totals about $10,314 in federal income tax - a 22% marginal rate but only a ~12.1% effective rate. This income tax calculator does that progressive math for you and shows the breakdown bracket by bracket. All figures are for tax year 2025 (the return filed in early 2026).

The 2025 federal income tax brackets

The U.S. uses a progressive system - each rate applies only to income within its band. The taxable-income thresholds for 2025 are:

Head of household has its own brackets (10% up to $17,000, 12% up to $64,850, then matching the single thresholds from 22% upward). The formula for the tax in any one band is simple:

Taxable income vs. gross income

You are not taxed on your gross pay. Taxable income = gross income − pre-tax contributions (like a traditional 401(k)) − your deduction. For 2025 the standard deduction is $15,000 (single), $30,000 (married filing jointly), $22,500 (head of household) and $15,000 (married filing separately). You itemize instead only if your deductible expenses - state and local taxes (capped), mortgage interest, charitable gifts - exceed the standard amount.

Effective vs. marginal rate

Your marginal rate is the bracket your last dollar lands in - it tells you the tax on your next dollar of income or the savings from your next deduction. Your effective rate (total tax ÷ income) is what you actually pay overall, and it is always lower because the first chunks of income are taxed at 10% and 12%. Earning more never lowers your take-home pay; only the income inside a higher band is taxed at the higher rate. If you want to drill into just one of these numbers, the Tax Bracket Calculator isolates your marginal band and the Effective Tax Rate Calculator focuses on the overall percentage.

Lower your taxable income

• Traditional 401(k): up to $23,500 in 2025 (+$7,500 catch-up at 50+) comes out pre-tax.
• Traditional IRA: up to $7,000 (+$1,000 catch-up at 50+), subject to income rules.
• HSA: up to $4,300 self-only / $8,550 family (+$1,000 catch-up at 55+) if you have a qualifying high-deductible plan.
• Itemize when it helps: compare your total itemized deductions to the standard deduction and take the larger.

How to use this calculator

You only need three or four numbers to get a realistic federal estimate. Work through the fields in order:

1. Gross income: enter your total annual income before any taxes or deductions - salary, wages, and other taxable earnings.
2. Filing status: choose single, married filing jointly, head of household, or married filing separately. This sets both your standard deduction and which bracket thresholds apply.
3. Pre-tax 401(k): add any traditional 401(k) contribution. This comes out before tax, so it directly lowers your taxable income.
4. Deduction: the calculator applies the 2025 standard deduction for your status by default. If your itemized deductions are larger, enter that amount instead.

The result updates instantly. Read your total federal income tax, your after-tax income, and your effective and marginal rates at the top, then scroll the per-bracket breakdown to see exactly how much tax each band of income generated.

A second worked example: married filing jointly

Take a married couple filing jointly with $140,000 in combined gross income in 2025 and a $10,000 traditional 401(k) contribution. Subtract the 401(k) and the $30,000 standard deduction, and taxable income is $100,000. Applying the 2025 married-filing-jointly brackets in slices: 10% on the first $23,850 ($2,385.00), 12% on the next $73,100 up to $96,950 ($8,772.00), and 22% on the remaining $3,050 ($671.00). That totals about $11,828 in federal income tax - a 22% marginal rate but roughly an 8.5% effective rate on gross income. The same household without the 401(k) contribution would have $110,000 of taxable income and owe about $2,200 more, which is the pre-tax saving working in real time.

Who this calculator is for

This tool is built for anyone who wants a fast, accurate federal estimate without filling out a full return. That includes:

• Employees checking whether their paycheck withholding looks roughly right for the year.
• Job seekers and negotiators comparing offers by translating a salary into actual take-home federal tax.
• Side-hustlers and freelancers estimating what they may owe so they can set money aside for quarterly payments.
• Retirement savers testing how a larger 401(k), IRA, or HSA contribution changes their tax bill.
• Anyone planning ahead who wants a ballpark before tax season rather than a surprise in April.

What changes the result the most

If you adjust the inputs and watch the tax move, a few factors dominate the outcome:

• Gross income: the single biggest driver, and because the system is progressive, each additional dollar is taxed at your marginal rate, not your effective rate.
• Filing status: married-filing-jointly brackets and the $30,000 standard deduction are wider than single, so the same income often owes less.
• Pre-tax contributions: every dollar into a traditional 401(k), IRA, or HSA reduces taxable income dollar for dollar.
• Deduction choice: taking the larger of the standard or itemized deduction can shift thousands of dollars out of the taxed amount.
• Crossing a bracket line: only the income above each threshold is taxed at the higher rate, so crossing a line raises only your marginal rate, never your whole bill.

How this estimate is used in real life

The numbers from this calculator are a planning baseline, not your filed return. People use the estimate to check paycheck withholding - if your projected tax is far above or below what is being withheld, you can adjust your Form W-4 to avoid a large balance due or an oversized refund. Self-employed filers use it to size quarterly estimated payments so they are not penalized for underpaying. And anyone weighing a raise, a bonus, or a bigger retirement contribution can use the marginal rate to see the true after-tax value of that decision before committing to it.

Key income tax terms explained

A handful of terms come up again and again on tax forms and in this calculator. Knowing them makes every result easier to read:

• Gross income: everything you earn before any taxes or deductions - wages, salary, tips, bonuses, and most other taxable earnings.
• Adjusted gross income (AGI): gross income minus specific "above-the-line" adjustments such as traditional IRA and HSA contributions. Many credits and deduction limits are based on your AGI, not your gross pay.
• Taxable income: AGI minus your standard or itemized deduction. This is the number the brackets are actually applied to - usually well below your gross income.
• Standard deduction: a flat amount the IRS lets you subtract with no receipts required ($15,000 single, $30,000 married filing jointly for 2025). Most filers take it because it beats their itemized total.
• Itemized deductions: specific expenses you can subtract instead of the standard amount - state and local taxes (capped at $10,000), mortgage interest, and charitable gifts. You take whichever is larger.
• Tax bracket: a band of taxable income taxed at one rate. The U.S. has seven brackets from 10% to 37%, and the rate applies only to the income inside that band.
• Withholding: the income tax your employer takes out of each paycheck and sends to the IRS on your behalf, based on the Form W-4 you filed. Your refund or balance due at filing is the gap between withholding and your actual tax.
• Tax credit: a dollar-for-dollar reduction of the tax itself (for example, the Child Tax Credit), as opposed to a deduction, which only reduces taxable income.

Scenario comparison: how each choice moves your tax

Using a single filer with $85,000 of gross income as the baseline, here is how a few common decisions change the 2025 federal income tax (all other inputs held constant for illustration):

• Baseline - single, standard deduction, no 401(k): $70,000 taxable income and about $10,314 in federal income tax, a roughly 12.1% effective rate.
• Add a $10,000 traditional 401(k): taxable income drops to $60,000 and the tax falls to about $8,114 - the $10,000 contribution saves around $2,200 because it comes off the top, in the 22% band.
• Same income, head of household: the larger $22,500 standard deduction and wider brackets cut the tax to roughly $7,160, showing how much filing status alone can matter.
• Income rises to $110,000, single: taxable income of $95,000 stays inside the 22% band, raising tax to about $15,814 - but the first $70,000 is still taxed exactly as in the baseline.

The pattern holds across incomes: pre-tax contributions and filing status move your bill the most below six figures, while crossing into a new bracket only changes the rate on the new dollars, never the whole amount.

Limitations and assumptions

This calculator estimates federal income tax only. Keep these assumptions in mind:

• It does not include FICA (Social Security and Medicare), which are withheld separately on top of income tax - estimate those with the FICA Calculator.
• It does not include state or local income tax, which ranges from 0% to over 10% depending on where you live.
• It applies the standard deduction (or an amount you enter) but does not calculate individual itemized deductions, credits like the Child Tax Credit or Earned Income Tax Credit, or the alternative minimum tax.
• It assumes ordinary income taxed at the regular brackets; long-term capital gains and qualified dividends use separate, lower rates not modeled here.
• Figures are the verified 2025 IRS amounts; confirm the latest numbers on irs.gov before filing.

How it compares to related calculators

This page answers "what is my federal income tax on this income?" If your question is different, a sister tool fits better:

• For full take-home pay after income tax and FICA, use the Paycheck Calculator.
• To turn an annual salary into hourly, weekly, or biweekly figures, use the Salary Calculator.
• To estimate whether you will owe or get money back at filing time, use the Tax Refund Calculator.
• To see which bracket your last dollar lands in, use the Tax Bracket Calculator.
• To focus on the share of income you actually pay, use the Effective Tax Rate Calculator.
• For Social Security and Medicare alone, use the FICA Calculator; freelancers should add the Self-Employment Tax Calculator.
• To check how much should come out of each paycheck, use the Tax Withholding Calculator.