Income Tax Estimator (2026)

How to Use the Tax Estimator

Enter your gross annual income, filing status (single, married filing jointly, etc.), and any major adjustments (401k contributions, HSA, traditional IRA). The calculator subtracts pre-tax adjustments, applies the standard deduction, calculates federal income tax through 2026's progressive brackets, and shows your tax owed, effective rate, and marginal rate. Use it to plan year-end moves or set realistic W-4 withholding.

This tool covers federal income tax only. Add your state's tax separately. It doesn't model self-employment tax, AMT (rare since 2017), or specialized credits — for those, consult a CPA or use TurboTax/H&R Block.

Understanding Progressive Tax Brackets

The single biggest tax myth: "I'll cross into a higher bracket and lose money on a raise." False. Only the income above each bracket threshold is taxed at the higher rate. If you earn $103,000 (single, just below the 24% bracket), and you get a $1,000 raise, that extra $1,000 is taxed at 24% — you keep $760. You don't suddenly pay 24% on the full $104,000. Always take the raise.

2026 Federal Tax Bracket Reference (Single Filer)

The first $11,925 of taxable income is taxed at 10% → $1,193. The next $36,550 ($11,926–$48,475) is taxed at 12% → $4,386. The next $54,875 ($48,476–$103,350) is taxed at 22% → $12,073. So a single filer earning $103,350 taxable income owes $17,651 federal — effective rate of 17.1%, marginal rate of 22%. Compare your situation to this baseline.

The Power of Pre-Tax Contributions

Every dollar contributed to a traditional 401k, traditional IRA, or HSA directly reduces taxable income. If you're in the 22% bracket and contribute $10,000 to your 401k, you save $2,200 in federal tax this year. Over a career, this compounds enormously — and the contributed money grows tax-deferred. A high earner in the 35% bracket maxing their 401k ($23,500) saves $8,225 annually in tax just by directing salary into retirement. Run scenarios through this estimator before signing up for benefits to see the immediate cash impact.

Adjusting Your W-4 Withholding

If you owed a big bill at tax time, you under-withheld — fix it by reducing allowances or adding extra withholding on your W-4. If you got a big refund, you over-withheld — fix it by claiming more allowances and putting that monthly cash into investments instead. Refunds aren't free money; they're an interest-free loan to the government. Use this calculator each spring to confirm your withholding matches your projected liability.

Year-End Tax Planning Moves

December is your last chance for the current year. Max your 401k: the deadline is December 31, not April 15. Tax-loss harvest: sell losing taxable investments to offset gains. Charitable giving: donate appreciated stock (avoids capital gains AND gets deduction). HSA contributions: allowed through April 15. Roth conversions: if you're in a low-income year, convert some traditional IRA to Roth and pay tax at today's lower rate. After running this calculator, schedule a 30-minute review with a CPA — they often find $1,000+ in savings opportunities for high earners. Pair with our salary calculator to see your full income picture.