Why we built these calculators
Federal tax calculations involve dozens of thresholds, phaseouts, and special rules that change every year. Most people want a reasonable estimate before they sit down with a professional or open their tax software. These tools provide that estimate quickly, using the same published IRS formulas that govern the actual calculations.
Every calculator on this site is free, requires no account, and stores nothing. The tradeoff is that free tools cannot account for every individual situation. The limitations section below explains exactly where each calculator falls short.
Reference tools, not filing advice
These calculators are reference tools generated from publicly available IRS formulas. Each calculation should be verified against current IRS guidance before relying on it for tax filing or planning. Tax law changes annually, and individual circumstances vary in ways a general calculator cannot capture. Always consult a qualified tax professional before making decisions based on these estimates.
How each calculator works
Federal Income Tax Calculator
Applies the seven 2025 federal income tax brackets from IRS Publication 17 and Rev. Proc. 2024-40. Subtracts the standard deduction (or itemized deductions if entered), then applies progressive rates to taxable income. The Child Tax Credit is reduced by $50 per $1,000 above the phase-out thresholds. Does not calculate EITC, AMT, or self-employment tax.
Tax Refund Calculator
Estimates whether a filer will receive a refund or owe tax by comparing estimated tax liability (computed using the same bracket logic as the Federal Income Tax Calculator, per IRS Publication 17) against the total withholding entered by the user. The difference is the projected refund or balance due. Does not account for underpayment penalties.
No Tax on Tips Calculator
Models the tip income deduction proposed under the One Big Beautiful Bill Act (OBBBA), which passed the House in May 2025 and has been incorporated into IRS planning guidance. The deduction applies to cash tips reported on Form W-2 Box 7. Because this provision is based on recently enacted legislation, exact implementation rules may differ from the calculator's assumptions. Verify current IRS guidance before relying on this estimate.
No Tax on Overtime Calculator
Models the overtime pay deduction also proposed under the OBBBA. Overtime is defined as hours compensated at 1.5x the regular rate per the Fair Labor Standards Act. This provision is subject to the same legislative uncertainty as the tips deduction, and its income phase-out thresholds have not yet been finalized in IRS published guidance. Treat this calculator as an illustrative estimate only.
Senior Tax Deduction Calculator
Calculates the additional standard deduction available to taxpayers age 65 or older and/or blind, as defined in IRS Publication 17 and Rev. Proc. 2024-40. For 2025, the additional deduction is $2,000 per qualifying person for single filers and $1,600 per qualifying person for married filers. Also applies the standard income tax brackets to estimate total tax with the enhanced deduction.
Tax Bracket Calculator
Illustrates how each dollar of taxable income is taxed at progressive rates using the 2025 brackets from Rev. Proc. 2024-40. Displays both the marginal rate (the rate on the last dollar earned) and the effective rate (total tax as a percentage of gross income). Based on IRS Publication 17.
Self-Employment Tax Calculator
Computes the 15.3% self-employment tax (12.4% Social Security + 2.9% Medicare) on 92.35% of net self-employment income, per Schedule SE and IRS Publication 334. The Social Security portion applies only up to the 2025 wage base of $176,100. Also estimates the above-the-line deduction for one-half of SE tax. Does not calculate the qualified business income (QBI) deduction.
Paycheck Calculator
Estimates net take-home pay by applying federal withholding using the percentage method tables from IRS Publication 505 and IRS Pub 15-T. Subtracts FICA taxes (Social Security 6.2%, Medicare 1.45%). State income tax is not included. Results may differ from actual paycheck due to pre-tax benefit deductions, supplemental wage rules, and employer-specific withholding elections on Form W-4.
New Tax Law Calculator
Compares estimated 2025 tax liability under current law (Rev. Proc. 2024-40) against projected liability under key OBBBA provisions including higher standard deductions, the tips and overtime deductions, and updated estate thresholds. Because the OBBBA has not yet been fully enacted into final IRS regulations, these comparisons are projections only.
Capital Gains Tax Calculator
Applies the 0%, 15%, and 20% long-term capital gains rate brackets from Rev. Proc. 2024-40. Short-term gains (assets held one year or less) are taxed as ordinary income at regular bracket rates, per IRS Publication 17. Does not calculate the 3.8% Net Investment Income Tax (NIIT) on high-income filers.
Child Tax Credit Calculator
Applies the Child Tax Credit rules for 2025: up to $2,000 per qualifying child under 17, with phase-out beginning at $400,000 AGI (MFJ) or $200,000 (all others), per Schedule 8812. Note: IRS Publication 972 has been retired; the IRS now directs filers to Schedule 8812 instructions for child tax credit calculations. The refundable Additional Child Tax Credit is calculated using the 15% of earned income above $2,500 formula.
SALT Deduction Calculator
Calculates the state and local tax deduction subject to the $10,000 cap enacted under the 2017 Tax Cuts and Jobs Act (Schedule A, per IRS Publication 17). The OBBBA proposes raising the SALT cap to $40,000 for certain income ranges; this change is reflected in a comparison view but should be treated as legislative projection until enacted into final regulations.
Car Loan Interest Deduction Calculator
Calculates the deductible portion of vehicle loan interest for business use, per IRS Publication 463. Only the business-use percentage of interest is deductible. Personal vehicle loan interest is not deductible, regardless of the amount. The calculator requires the user to input the business-use percentage; it cannot verify actual mileage logs.
W-4 Calculator
Helps estimate the correct withholding allowances and additional withholding amount for Form W-4, based on the percentage-method tables in IRS Publication 505. Because W-4 elections depend on the full household picture (multiple jobs, spouse income, other income sources), this calculator provides a starting estimate. Use the IRS Tax Withholding Estimator for a more complete analysis.
Quarterly Tax Calculator
Estimates quarterly estimated tax payments for self-employed individuals and others with income not subject to withholding, per the safe-harbor rules in IRS Publication 505. The safe harbor requires paying either 100% of prior-year tax liability or 90% of current-year liability (110% of prior-year for AGI above $150,000). Payment due dates are April 15, June 16, September 15, and January 15.
Known limitations
- State taxes excluded. All calculators compute federal tax only. State income taxes, which vary significantly, are not included unless the calculator explicitly states otherwise.
- Tax law changes annually. IRS inflation adjustments are published each fall for the following tax year. Calculators are updated when new data is published, but there may be a lag. Check Tax Law Updates for the latest data.
- Alternative Minimum Tax not included. Higher-income filers may be subject to the AMT, which uses a parallel calculation. None of these calculators compute AMT.
- Not all credits included. Earned Income Tax Credit, education credits, premium tax credit, and other refundable credits are not reflected in most calculators.
- Phaseouts simplified. Some phaseouts use linear approximations that may differ slightly from exact IRS worksheet results at boundary values.
- Legislative proposals. Calculators that model OBBBA provisions are based on the version passed by the House in May 2025. Final Senate amendments, if any, may change the calculations.
- 2025 tax year values. Calculator values are aligned with IRS Rev Proc 2024-40 (Oct 2024) for tax year 2025.
IRS publications referenced
| Publication | Title | Status |
|---|---|---|
| Pub 17 | Your Federal Income Tax (For Individuals) | Current (Tax Year 2025) |
| Pub 334 | Tax Guide for Small Business | Current (Tax Year 2025) |
| Pub 463 | Travel, Gift, and Car Expenses | Current (Tax Year 2025) |
| Pub 505 | Tax Withholding and Estimated Tax | Current (2026) |
| Pub 587 | Business Use of Your Home | Current (Tax Year 2025) |
| Pub 535 | Business Expenses | Retired (last: 2022) |
| Pub 936 | Home Mortgage Interest Deduction | Current (Tax Year 2025) |
| Pub 970 | Tax Benefits for Education | Current (Tax Year 2025) |
| Pub 972 | Child Tax Credit | Retired (use Schedule 8812) |
See the full IRS Publications reference page for current revision dates and links.
Help improve these tools
If you find a calculation error, an outdated figure, or a missing edge case, please submit a correction. We verify all reported discrepancies against the IRS source before making changes. You can also check Tax Law Updates to see the most recent data incorporated into each calculator.