Tax Calculators
Tax calculations are the most formula-driven area of personal finance, yet the underlying rules are often opaque. The U.S. uses a progressive marginal rate system for most income types, meaning your effective tax rate depends on which brackets your income passes through — not a single flat percentage applied to the whole. These calculators apply the current year's IRS figures to your specific situation.
The income tax estimator is the most broadly applicable tool. It models federal income tax for W-2 employees and straightforward returns: enter gross income, filing status, and deduction choice (standard or an approximated itemized amount), and it applies the 2026 federal brackets and standard deductions to produce an estimated liability and effective rate.
Capital gains tax applies differently than ordinary income tax. Long-term gains — on assets held longer than one year — are taxed at preferential rates of 0%, 15%, or 20% depending on your total taxable income. The capital gains tax calculator models this correctly, which matters when deciding whether to hold or sell an appreciated asset or when rebalancing a taxable investment account.
Bonus withholding is a common source of surprise: employers typically withhold a flat 22% on supplemental wages (the "supplemental rate") rather than aggregating the bonus with regular pay and applying your marginal rate. The bonus tax calculator shows both the flat-rate withholding and the true marginal impact.
Self-employment tax deserves its own calculator because self-employed individuals effectively pay both the employee and employer shares of FICA — 15.3% on net self-employment income up to the Social Security wage base — in addition to regular income tax. And the estate tax calculator applies the federal unified credit and applicable exclusion amount to large estates.
Which Calculator Should You Use?
| Calculator | Best for / use when | Link |
|---|---|---|
| Income Tax Estimator | Estimating your total federal income tax liability and effective rate for the year, useful for quarterly estimated payments or reviewing withholding adequacy | Open → |
| Capital Gains Tax Calculator | Calculating the federal tax on investment gains, particularly for assets held more than one year that qualify for preferential long-term capital gains rates | Open → |
| Bonus Tax Calculator | Estimating the after-tax amount of a cash bonus, given that employers often withhold at the flat 22% supplemental rate rather than your regular marginal rate | Open → |
| Estate Tax Calculator | Estimating whether a large estate will owe federal estate tax based on the current applicable exclusion amount and the estate's gross value | Open → |
| Self-Employment Tax Calculator | Computing the self-employment tax owed on net self-employment income — the combined employer and employee share of Social Security and Medicare for freelancers and sole proprietors | Open → |
All Tax Calculators
Income Tax Estimator
Estimate your 2026 federal income tax based on your gross income and filing status. See your effective tax rate, marginal tax rate, and bracket-by-bracket breakdown.
Self-Employment Tax Calculator
Calculate your 2026 self-employment tax including Social Security, Medicare, and additional Medicare tax. See quarterly estimated payments and your income tax deduction for SE tax.
Capital Gains Tax Calculator
Calculate your 2026 federal capital gains tax on stock, real estate, or other investments. Covers short-term and long-term rates, NIIT, and net proceeds after tax.
Bonus Tax Calculator
Calculate how much of your bonus you will take home after federal, FICA, and state taxes. Uses the 2026 IRS flat 22% supplemental withholding rate for bonuses under $1 million.
Estate Tax Calculator
Estimate your 2026 federal estate tax liability. Calculate taxable estate after deductions, apply the $13.99 million exemption, and see graduated rates from 18% to 40%.
HSA Calculator: 2026 Contribution Limits & FICA Savings
Calculate your 2026 HSA contribution limit, the triple-tax-advantage, and how much you save on FICA payroll tax by contributing through payroll. See multi-year tax-free growth.
Quarterly Estimated Tax Calculator
Calculate your 2026 quarterly estimated tax payments (Form 1040-ES) for self-employment and other income. See the safe-harbor amount, per-quarter payment, and due dates.
Charitable Giving Tax Deduction Calculator
Calculate your 2026 charitable donation tax deduction under the new OBBBA rules — the 0.5%-of-AGI floor for itemizers and the $1,000/$2,000 above-the-line deduction for non-itemizers.
Marginal vs Effective Tax Rate Calculator
See the real difference between your marginal tax rate and effective tax rate. Visualize exactly how much of your income falls into each 2026 federal tax bracket.