Income Tax Calculator
Estimate 2024 US federal income tax, refund or balance due, effective rate, and marginal bracket. Supports W-2 wages, self-employment income, capital gains, and retirement distributions.
Person 1 Earned Income
Other Family Incomes
Deductions
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How It Works
Federal tax uses marginal brackets — each bracket applies only to income within that range. For a $60,000 single filer in 2024: $11,600 × 10% = $1,160, ($47,150 − $11,600) × 12% = $4,266, ($60,000 − $47,150) × 22% = $2,827. Total tax = $8,253. Effective rate = 8,253/60,000 = 13.8%, not 22%.
Tax = Σ (bracket income × bracket rate) | each bracket taxed separately$60k single: brackets 10%+12%+22% → effective 13.8%, marginal 22%Take whichever is larger. Standard deduction (2024): $14,600 single, $29,200 MFJ. Itemized: mortgage interest + charitable gifts + state/local taxes (SALT, capped at $10,000) + medical expenses above 7.5% AGI. Most households take standard after 2018 SALT cap. Enter itemized total if larger; calculator automatically uses whichever benefits you more.
Use whichever is larger: standard or total itemized deductionsSingle with $12k itemized → take $14,600 standard | save $1,300+ in taxesSE income is taxed as both income AND SE tax (15.3% on 92.35% of net SE income). Unlike W-2 employees who pay 7.65% (employer pays other half), self-employed pay both halves. Half of SE tax is deductible. A freelancer earning $50,000 net pays about $7,065 in SE tax plus federal income tax on ($50,000 − $3,532 deduction).
SE tax = 0.9235 × net_SE × 0.153 | half deductible from AGI$50k SE income → $7,065 SE tax + income tax on $46,468 AGIThe CTC reduces your tax liability dollar-for-dollar — much more valuable than a deduction. $2,000 per child, phasing out above $200,000 (single) or $400,000 (MFJ) at 5% per $1,000 above threshold. Up to $1,600 is refundable (Additional Child Tax Credit) — you can receive it even if it exceeds your tax liability.
CTC: $2,000/child, phases out above $200k/$400k, up to $1,600 refundable2 children: up to $4,000 credit reduces tax or generates $3,200 refundYour W-2 box 2 (federal withholding) is what your employer sent to the IRS throughout the year. Tax liability is what you actually owe based on your full-year situation. The difference determines refund or payment due. A large refund means you over-withheld — giving the IRS an interest-free loan. Adjust W-4 to match withholding to expected liability.
Refund = withholding − tax liability | adjust W-4 to minimize differenceW-2 box 2: $12,000 withheld, liability $10,000 → $2,000 refundQuick Reference
Verify these in the calculator above.
Tax calc
$60k, single, 2024
Tax ≈ $8,253, effective 13.8%
Deduction
Standard deduction 2024, single
$14,600
Deduction
Standard deduction 2024, MFJ
$29,200
SE tax
SE tax on $50k net income
≈ $7,065
Child credit
CTC per qualifying child
$2,000
Bracket
Marginal bracket at $80k single
22% bracket
Effective
Effective rate at $80k single
≈ 15%
Refund
Refund formula
Withheld − Liability
Tips & Shortcuts
This calculator estimates federal income tax. State income taxes vary widely — from 0% (TX, FL, WA) to 13.3% (CA) — and must be calculated separately.
A large refund is not free money — it means you gave the IRS an interest-free loan all year. Adjust your W-4 to owe near zero at filing time.
Self-employed individuals should pay quarterly estimated taxes (April 15, June 17, Sept 15, Jan 15) to avoid underpayment penalties. The calculator shows your estimated annual liability to help set quarterly payments.
The Child Tax Credit phases out gradually above income thresholds — even partial credits are valuable. Check eligibility even if income is near the phaseout range.
Contributing to a traditional 401(k) or IRA reduces AGI directly, potentially dropping you into a lower bracket and unlocking additional tax credits.
Common Mistakes
Applying marginal rate to total income
Being in the 22% bracket does not mean paying 22% on all income. Only income above $47,150 (single 2024) is taxed at 22%. Below that, rates of 10% and 12% apply. The effective rate is always lower than the marginal rate.
Forgetting self-employment tax on top of income tax
SE tax of 15.3% is in addition to federal income tax. A $50,000 freelancer owes roughly $7,065 in SE tax PLUS income tax. The combined rate can exceed 30% before state taxes.
Using last year's brackets for the current year
2024 brackets are inflation-adjusted upward from 2023. Using 2023 brackets slightly overstates taxes. The calculator uses the current year's values.
Not entering all income sources
Include W-2 wages, self-employment income, capital gains, rental income, retirement distributions (traditional 401k/IRA withdrawals are taxable). Underreporting income understates tax liability and may lead to penalties.
Treating the estimate as exact
This calculator estimates tax based on common scenarios. It does not account for all credits (EIC, education credits, energy credits), AMT, or complex situations. For final tax planning, consult a CPA.
Frequently Asked Questions
Federal tax uses progressive brackets. Only the income in each bracket is taxed at that rate. For 2024 single filers: 10% on first $11,600, 12% on $11,600-$47,150, 22% on $47,150-$100,525, 24% on $100,525-$191,950, 32% on $191,950-$243,725, 35% on $243,725-$609,350, 37% above $609,350.
Single: $14,600. Married Filing Jointly: $29,200. Head of Household: $21,900. Over 65 or blind: add $1,950 (single) or $1,550 (married). The standard deduction reduces taxable income before applying brackets.
Marginal rate is the rate on your last dollar of income — your tax bracket. Effective rate is total tax divided by total income — your average. If you earn $80,000 single, marginal rate is 22% but effective rate is about 15%. You do not pay 22% on all $80,000.
SE tax = 15.3% of net SE income (92.35% of self-employment income). This covers both employee and employer portions of Social Security (12.4%) and Medicare (2.9%). Half of SE tax is deductible from AGI. The calculator adds SE tax to federal income tax for the total liability.
Up to $2,000 per qualifying child under 17, with up to $1,600 refundable. Phases out at $200,000 (single) and $400,000 (MFJ). Enter the number of qualifying children in the calculator — the credit directly reduces your tax liability dollar-for-dollar.
AGI (Adjusted Gross Income) = total income − above-the-line deductions (student loan interest, IRA contributions, SE tax deduction, etc.). AGI determines eligibility for many credits and deductions. Lower AGI unlocks Roth IRA contribution eligibility, child tax credit phaseout, and itemized deduction limits.
Refund = total withholding (W-2 box 2 + box 17 + quarterly estimates) − total tax liability. If withholding exceeds liability: refund. If liability exceeds withholding: amount owed. Enter your W-2 withholding amounts for the most accurate estimate.
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