Income Tax Bracket Optimizer

Federal income tax is marginal, not flat — you don't pay one rate on your whole income, you pay each bracket's rate only on the slice of income that falls inside it. This calculator pulls the real 2026 federal brackets and standard deduction figures from the site's statutory reference data (not hardcoded numbers that go stale), computes your taxable income as gross income minus whichever is larger of your standard or itemized deduction, minus pre-tax retirement contributions and HSA contributions, and then walks that taxable income through each bracket in order, taxing only the portion that lands in each one. The bracket where your last dollar of taxable income falls is your marginal rate — the rate that applies to your *next* dollar earned, which is different from (and always higher than or equal to) your effective rate, the average rate across all your income shown separately here.

Room in Current Bracket is the most actionable output: it's the taxable-income distance between where you are now and the next bracket's threshold, i.e., how much additional income, bonus, or capital gain you could absorb before your Marginal Rate jumps up. A common mixup is assuming crossing into a higher bracket taxes your entire income at the new rate — it doesn't; only the incremental amount above the threshold is taxed higher. This model also only covers federal brackets, so state and local income tax, the Additional Medicare Tax, and phase-outs on credits and deductions at higher incomes aren't reflected here.