Income Tax Calculator 2024 — Federal Tax Estimate

Estimate 2024 federal income tax from gross income, filing status, and deductions. See bracket-by-bracket breakdown, effective rate, marginal rate, and after-tax income.

Calculating tax on a purchase, not annual income?

This page estimates federal income tax on earnings. For sales tax on a purchase price, use the Sales Tax Calculator →

Filing Status

Gross Income ($)

Deduction Type

Pre-tax Deductions (401k, HSA) ($)

Tax Credits (Child, Education) ($)

What is Federal Income Tax?

Federal income tax is a progressive tax on individual and business earnings — higher income is taxed at higher marginal rates across brackets (10% to 37% for 2024). Taxable income is gross income minus the standard deduction ($14,600 single / $29,200 MFJ in 2024) or itemised deductions.

Use this page to estimate annual federal tax liability, compare effective vs marginal rate, and plan for quarterly estimated payments or financial decisions (Roth conversions, retirement contributions). It answers “how much income tax do I owe on my earnings?”

For tax added to a purchase price at checkout — US state sales tax, GST, or VAT — use the Sales Tax Calculator, GST Calculator, or VAT Calculator. Income tax is on earnings; consumption taxes are on goods and services sold.

How the Income Tax Calculator Works

Formula, assumptions, and calculation steps for this tax tool.

Formula Used

Tax = sum of Bracket Portion of Income x Bracket Rate, applied progressively

Methodology

Applies each progressive tax bracket only to the portion of income that falls within it, then sums the bracket amounts.

Calculation Steps

Enter taxable amounts and any deductions or allowances.
Apply the relevant brackets, rates, or tax percentage.
Calculate gross tax, credits, or net amount where supported.
Show totals for planning and comparison.

Assumptions and Limits

Tax rules change by jurisdiction and year.
Local surcharges, credits, and filing status details may not be exhaustive.
Consult a tax professional for filing decisions.

Frequently Asked Questions

What is the difference between effective and marginal tax rate?

Your marginal tax rate is the rate on your last dollar of income (your top bracket). Your effective rate is your total tax divided by your total income — almost always lower because lower income dollars are taxed at lower rates. For example, a single filer with $100,000 taxable income has a 22% marginal rate but pays an effective rate of about 17%.

What is the 2024 standard deduction?

For 2024: Single — $14,600; Married Filing Jointly — $29,200; Head of Household — $21,900; Married Filing Separately — $14,600. These amounts are higher for taxpayers 65 or older or legally blind.

Should I take the standard deduction or itemize?

Itemize if your deductible expenses (mortgage interest, state/local taxes up to $10,000, charitable donations, medical expenses exceeding 7.5% of AGI) exceed the standard deduction for your filing status. About 90% of taxpayers now take the standard deduction after the 2017 Tax Cuts and Jobs Act nearly doubled it.

Do tax credits reduce taxable income or the actual tax owed?

Tax credits directly reduce the tax you owe, dollar for dollar. A $2,000 tax credit saves you $2,000 in taxes. A $2,000 deduction saves you only $440 if you're in the 22% bracket. Refundable credits (like the Earned Income Tax Credit) can even result in a refund if they exceed your tax liability.

Real-World Applications

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W-4 Withholding Adjustment

Estimate your annual tax liability to determine if your current withholding is accurate — then adjust your W-4 to avoid a large refund (interest-free loan to IRS) or surprise bill.

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Freelance Quarterly Tax Estimates

Calculate quarterly estimated tax payments (due April, June, September, January) to avoid the underpayment penalty as a self-employed individual.

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Capital Gains Tax Planning

Estimate the additional federal tax on a planned stock or property sale to decide whether to realise gains this year or defer to next year based on projected income.

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Roth Conversion Analysis

Calculate how much of a traditional IRA can be converted to a Roth IRA while staying within a target tax bracket, minimising lifetime tax liability.

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Bonus Tax Estimation

Estimate the net after-tax value of a year-end bonus at your marginal tax rate to make informed decisions about deferral through 401(k) contributions.

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Side Income Tax Impact

Calculate the additional federal and self-employment tax from side business income to budget for quarterly payments and avoid April surprises.

Common Mistakes

Confusing marginal and effective tax rate

Your marginal rate is the rate on your last dollar — it does NOT mean all your income is taxed at that rate. A $100,000 single filer in the 22% bracket pays an effective rate of ~17% because lower income is taxed at 10% and 12%.

Not claiming above-the-line deductions

Deductions like HSA contributions, student loan interest, and self-employed health insurance reduce AGI before the standard deduction — they benefit ALL taxpayers, not just those who itemise.

Forgetting self-employment tax

Freelancers and the self-employed pay 15.3% self-employment (FICA) tax on net earnings in addition to income tax. Forgetting this leads to severe underpayment — always include it in tax estimates.

Filing the wrong status

Filing status significantly impacts your tax liability. Head of Household provides a much larger standard deduction and lower rates than Single for qualifying single parents — misclassification is common and costly.

Not accounting for the Net Investment Income Tax

High earners (over $200K single / $250K married) pay an additional 3.8% NIIT on investment income (dividends, capital gains, rental income). This is separate from regular income tax brackets.

2024 Federal Income Tax Brackets (Single Filer)

Tax Rate	Taxable Income Range	Tax on This Portion
10%	$0 – $11,600	$0 + 10% of income
12%	$11,601 – $47,150	$1,160 + 12% over $11,600
22%	$47,151 – $100,525	$5,426 + 22% over $47,150
24%	$100,526 – $191,950	$17,169 + 24% over $100,525
32%	$191,951 – $243,725	$39,111 + 32% over $191,950
35%	$243,726 – $609,350	$55,679 + 35% over $243,725
37%	$609,351+	$183,647 + 37% over $609,350

References

IRS. Revenue Procedure 2023-34 — 2024 Tax Year Inflation Adjustments. Internal Revenue Service, 2023.
IRS. Publication 505 — Tax Withholding and Estimated Tax. IRS, 2024.
Tax Policy Center. T24-0012 — Baseline Tax Expenditures. Urban-Brookings Tax Policy Center, 2024.
Tax Foundation. 2024 Tax Brackets. Tax Foundation, 2024.
Congressional Budget Office. The Distribution of Household Income. CBO, 2023.