Federal Income Tax Estimator: Walking Through 2026 Brackets
Estimating your 2026 federal tax liability is mostly mechanical: gross income → adjustments → standard or itemized deduction → taxable income → bracket math → credits. The calculator does the arithmetic, but you'll get a more accurate number if you understand which line each input affects.
Step 1 — Gross income and adjustments
Enter wages from your W-2 box 1, plus interest (1099-INT), dividends (1099-DIV), capital gains (1099-B), and any side income (1099-NEC). Subtract above-the-line adjustments: 401(k) employee contributions (already excluded from W-2 box 1), HSA contributions, traditional IRA contributions if eligible, student loan interest (up to $2,500), and self-employed health insurance.
Result: your Adjusted Gross Income (AGI). Many tax credits and deduction phase-outs use AGI as the trigger, so accuracy here matters.
Step 2 — Apply the standard deduction or itemize
For 2026, the IRS standard deduction is $15,000 single / $30,000 married filing jointly / $22,500 head of household (per most recent inflation-adjusted Rev. Proc.). Most filers (about 90%) take the standard.
Itemize if SALT (capped at $10,000) + mortgage interest + charitable giving + medical above 7.5% AGI exceeds your standard deduction. Subtract the larger of the two from AGI to get taxable income.
Step 3 — Run the brackets and apply credits
2026 federal brackets for single filers (per the latest IRS Rev. Proc. inflation adjustment): 10% on first $11,925, 12% to $48,475, 22% to $103,350, 24% to $197,300, 32% to $250,525, 35% to $626,350, and 37% above. Married filing jointly brackets are roughly double the single thresholds.
Taxable income $80,000 single → $11,925 × 10% + $36,550 × 12% + $31,525 × 22% = $13,529 before credits. Apply Child Tax Credit ($2,000/child under 17, phase-out at $200K single / $400K MFJ), Saver's Credit, and education credits to get the final number.
Frequently asked questions
Are 2026 brackets confirmed?
The IRS publishes inflation-adjusted brackets each fall via Rev. Proc. for the following tax year. Always verify on irs.gov before filing — Congress also occasionally passes legislation that changes brackets mid-year.
What's the difference between marginal and effective tax rate?
Marginal is the rate on your last dollar (the bracket you're in). Effective is total tax divided by taxable income — almost always lower than marginal. The $80,000 single example above has a 22% marginal rate but a 16.9% effective rate.
Does this account for state tax?
No — the calculator handles federal only. State income tax is a separate calculation: 9 states have no income tax, 10 have flat rates, and the rest use brackets similar to federal. Your CPA or tax software handles both.
Last reviewed on 2026-04-26.