The formulas
- Taxable income = income - larger of standard and itemized deductions
- Tax = sum over brackets of (income in bracket x rate)
- Standard deduction = base + additional per aged or blind box
How it works
Tax year: 2026.
Taxable income is income minus the larger of the standard deduction and itemized deductions. Tax is the sum, for each bracket, of the part of taxable income inside the bracket times its rate. The 2026 rates are 10, 12, 22, 24, 32, 35 and 37 percent. The standard deduction for 2026 is $32,200 for married filing jointly, $24,150 for head of household and $16,100 for single and married filing separately, plus $1,650 per aged or blind box ($2,050 if unmarried and not a surviving spouse).
Brackets and the standard deduction come from Rev. Proc. 2025-32. The tool uses ordinary-income brackets only: long-term gains and qualified dividends have their own tool, and credits, AMT and self-employment tax are not applied.
Illustrative figures only. Check the result against your firm's methodology before relying on it.
Common questions
What is the 2026 standard deduction?
$16,100 for single and married filing separately, $24,150 for head of household and $32,200 for married filing jointly and surviving spouses, per Rev. Proc. 2025-32.
What is the difference between marginal and effective rate?
The marginal rate is the rate on your last dollar of taxable income. The effective rate is total tax divided by income, which is lower because lower brackets fill first.
Where does the top 37 percent rate start in 2026?
Taxable income over $640,600 for single and head of household, $768,700 for married filing jointly and $384,350 for married filing separately.
Sources
- Rev. Proc. 2025-32, tax year 2026 inflation adjustments (IRS)
- IRS news release IR-2025-103, 2026 tax inflation adjustments
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