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Federal Income Tax Calculator

Tax

Calculate your 2024 US federal income tax owed, effective tax rate, and marginal bracket by filing status. Supports standard and itemized deductions and pre-tax retirement contributions.

🇺🇸This tool is specific to United States
$0$1,000,000
$5,000
$0

Federal Tax Owed

$0
Effective Rate0.00%
tax ÷ gross income — your real overall rate
Marginal Rate0.00%
the rate on your last dollar earned
Taxable Income
$0

What is a Federal Tax?

A federal income tax calculator estimates the US federal income tax you owe for a given tax year based on your gross income, filing status, pre-tax deductions (such as 401(k) and HSA contributions), and your choice of standard or itemized deduction. It applies the IRS progressive tax brackets to your taxable income to show your tax liability, effective rate, marginal rate, and taxable income — the four numbers most useful for financial planning.

The US federal income tax system is deliberately progressive: each layer of income is taxed only at the rate for that bracket, not your entire income. This means a single filer earning $80,000 does not pay 22% on their full income — they pay 10% on the first $11,600, 12% on the next $35,550, and only 22% on the remaining $31,250. The result is an effective rate far below the marginal rate, which surprises many taxpayers who assume their marginal bracket applies to everything.

Understanding this distinction matters for two practical reasons. First, it reveals the true cost of earning additional income — a raise that pushes you from 22% to 24% brackets means only the income above $100,525 (single filer threshold) is taxed at 24%; your existing income is unaffected. Second, it shows the value of deductions at your marginal rate: a $1,000 deduction saves you $220 at the 22% rate and $320 at the 32% rate — not the same dollar amount for everyone.

The calculator currently uses 2024 IRS figures. Brackets are inflation-adjusted annually; the 2024 brackets are approximately 5.4% wider than 2023, meaning slightly less income is subject to higher rates than the prior year.

For tax liability after accounting for what has already been withheld from your paycheck, use our Tax Refund Estimator. For self-employment tax on freelance or 1099 income, use the Self-Employment Tax Calculator.

How to use this Federal Tax calculator

  1. Enter your Annual Gross Income — use your total W-2 wages (Box 1) plus any other taxable income (freelance, dividends, interest). If you have self-employment income, enter the gross amount here and separately compute SE tax.

  2. Select your Filing Status — the status that matches your situation as of December 31 of the tax year. If you are widowed with a dependent child, you may qualify for Married Filing Jointly rates in the two years following your spouse's death — check IRS rules.

  3. Enter Pre-tax Deductions — include only amounts that reduce your AGI: traditional 401(k), 403(b), SEP-IRA contributions; HSA contributions; FSA contributions; and self-employed health insurance premiums. Do not include Roth contributions (post-tax) or standard living expenses.

  4. Select your Deduction Type — choose Standard if you are not itemizing. Choose Itemized if your mortgage interest, SALT (state and local taxes, capped at $10,000), charitable contributions, and other deductible expenses total more than the standard deduction for your filing status.

  5. Enter Itemized Deductions — only if you selected Itemized in the previous step. The most common items: mortgage interest (Form 1098), property taxes plus state income tax or sales tax (capped at $10,000 combined), and charitable contributions with receipts.

  6. Read all four outputs — Federal Tax Owed is your planning number; Effective Rate shows your true burden; Marginal Rate shows the cost of additional income; Taxable Income lets you verify your bracket position.

Formula & Methodology

Step 1 — Adjusted Gross Income:
AGI = Gross Income − Pre-tax Deductions (401k, HSA, FSA, self-employed health insurance)

Step 2 — Taxable Income:
Taxable Income = AGI − max(Standard Deduction, Itemized Deductions)

2024 Standard Deductions: Single $14,600 | MFJ $29,200 | MFS $14,600 | HOH $21,900

Step 3 — Apply brackets progressively:
Tax = Σ (rate × amount in each bracket)

2024 brackets for Single filers:

| Bracket | Rate | On Income Between |
|---|---|---|
| 1 | 10% | $0 – $11,600 |
| 2 | 12% | $11,601 – $47,150 |
| 3 | 22% | $47,151 – $100,525 |
| 4 | 24% | $100,526 – $191,950 |
| 5 | 32% | $191,951 – $243,725 |
| 6 | 35% | $243,726 – $609,350 |
| 7 | 37% | $609,351+ |

Worked example (Single, $85,000 income):

Gross: $85,000 | 401(k): $5,000 | AGI: $80,000

Standard deduction (Single): $14,600

Taxable income: $65,400

Tax: $11,600 × 10% + ($47,150 − $11,600) × 12% + ($65,400 − $47,150) × 22%

= $1,160 + $4,266 + $4,015 = $9,441

Effective rate: $9,441 ÷ $85,000 = 11.1%

Marginal rate: 22%

Assumptions: This calculator models federal income tax only — not FICA (Social Security and Medicare), state income taxes, Alternative Minimum Tax (AMT), Net Investment Income Tax (NIIT), or self-employment tax. Capital gains are not separately modelled. The calculator assumes taxable income consists of ordinary income only. Tax credits (child tax credit, earned income credit, education credits) are not applied; use the Tax Refund Estimator to incorporate credits into a refund estimate.

Frequently Asked Questions

A federal income tax calculator estimates the amount of US federal income tax you owe based on your gross income, filing status, pre-tax deductions, and whether you take the standard or itemized deduction. It applies the IRS 2024 tax brackets to your taxable income to compute your tax liability, effective rate, and marginal bracket. Our calculator also shows your taxable income after all deductions so you can understand exactly what the IRS uses to determine your bill.
Federal income tax uses a progressive bracket system — income in each bracket is taxed at that bracket's rate only, not your entire income. First, subtract pre-tax deductions (401k, HSA, etc.) from gross income to get your Adjusted Gross Income (AGI). Then subtract your deduction — standard or itemized — to arrive at taxable income. Finally, apply each bracket's rate in sequence to the portion of taxable income that falls within it. For example, a single filer earning $80,000 in taxable income pays 10% on the first $11,600, 12% on the next $35,550, and 22% on the remainder — not 22% on everything.
For 2024, the IRS federal income tax brackets for single filers are: 10% on $0–$11,600; 12% on $11,601–$47,150; 22% on $47,151–$100,525; 24% on $100,526–$191,950; 32% on $191,951–$243,725; 35% on $243,726–$609,350; and 37% on income above $609,350. For married filing jointly, each bracket threshold is exactly doubled (e.g., 10% on $0–$23,200). Brackets are adjusted annually for inflation by the IRS.
The 2024 standard deductions are: $14,600 for single filers and married filing separately; $29,200 for married filing jointly; and $21,900 for head of household. Additional standard deduction amounts apply for taxpayers aged 65 or older or legally blind — $1,550 per qualifying condition for single filers, $1,250 per qualifying condition for married filers. The standard deduction is claimed by approximately 90% of US taxpayers because it exceeds their itemizable deductions.
Your marginal tax rate is the rate applied to your last dollar of income — the highest bracket you reach. Your effective tax rate is the actual percentage of your gross income that goes to federal tax. Because the US system taxes income in layers (only income within each bracket pays that bracket's rate), your effective rate is always lower than your marginal rate. A single filer with $80,000 in taxable income has a 22% marginal rate but an effective rate of approximately 12–13% on gross income, because most of the income is taxed at 10% and 12%.
The standard deduction is a flat amount ($14,600 for single filers in 2024) you subtract from AGI without documenting any specific expenses. Itemized deductions require you to list qualifying expenses — mortgage interest, state and local taxes (capped at $10,000), charitable contributions, and unreimbursed medical expenses exceeding 7.5% of AGI. You claim whichever is larger, and for the roughly 90% of filers whose itemized deductions are below the standard deduction, itemizing is not worth the documentation effort. High-income homeowners in high-tax states are the most likely group to benefit from itemizing.
Several contributions reduce your AGI before any deductions are applied: traditional 401(k) and 403(b) contributions (up to $23,000 in 2024); Health Savings Account (HSA) contributions ($4,150 single / $8,300 family in 2024); Flexible Spending Account (FSA) contributions (up to $3,200); and self-employed health insurance premiums. These above-the-line deductions reduce taxable income regardless of whether you itemize. A $5,000 401(k) contribution at a 22% marginal rate saves $1,100 in federal income tax — an instant 22% return before any investment growth.
Filing status determines which set of tax brackets applies and the size of your standard deduction. Married filing jointly typically results in the lowest tax for most couples because the bracket thresholds are doubled and the standard deduction is $29,200. Head of household gives single parents brackets and a standard deduction intermediate between single and MFJ, resulting in meaningfully lower tax than single filing for those who qualify. Married filing separately usually produces the highest combined tax for couples and is only advantageous in specific situations involving income-driven student loan repayment or certain liability separations.
This calculator computes federal income tax only — the amount reported on line 24 of Form 1040. It does not include Social Security and Medicare taxes (FICA, typically 7.65% on wages), state income taxes (which vary from 0% to 13.3% by state), or self-employment tax. If you are self-employed, use our [Self-Employment Tax Calculator](/self-employment-tax-calculator/) in addition to this one. For an estimate of your likely refund or amount owed at year-end based on withholding, use our [Tax Refund Estimator](/tax-refund-estimator/).
The calculator uses 2024 tax year figures: the 2024 IRS tax brackets (adjusted for inflation from 2023), the 2024 standard deduction amounts, and 2024 contribution limits for pre-tax deductions. If you are estimating taxes for a different year, note that bracket thresholds and standard deductions change annually. The IRS publishes inflation adjustments each fall for the following tax year. Our calculator is updated annually to reflect the current year's figures.
The most common errors are: confusing marginal and effective tax rates (thinking all income is taxed at the top bracket rate); forgetting that pre-tax deductions like 401(k) contributions reduce taxable income; choosing itemized deductions when the standard deduction is higher; and failing to account for credits (which reduce tax directly, unlike deductions which only reduce taxable income). Tax credits like the Child Tax Credit ($2,000 per qualifying child in 2024) reduce your tax dollar-for-dollar after the bracket calculation — use our [Tax Refund Estimator](/tax-refund-estimator/) to include credits in your estimate.
Long-term capital gains (assets held over one year) are taxed at preferential rates of 0%, 15%, or 20%, depending on your total taxable income — not at your ordinary income tax rate. Short-term capital gains are taxed as ordinary income. This calculator models ordinary income tax brackets only and does not separately calculate capital gains tax. Taxpayers with significant investment income should consult a tax professional or use IRS Publication 550 for the capital gains tax calculation, as the interaction between ordinary income and capital gains rates adds complexity that a simple estimate does not capture.
Also known as
US income tax calculatorfederal tax calculatorIRS tax calculatorincome tax estimator 2024tax bracket calculator