Federal vs. state income tax
U.S. workers pay two layers of income tax in most states: federal and state. The federal layer uses seven progressive brackets (10% → 37%) applied to taxable income after the standard or itemized deduction. The Income Tax Calculator models both layers together for any state plus a clean federal-only view for the nine states with no wage income tax (Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, Wyoming).
State income tax varies more than most people realize: nine states have a single flat rate (Illinois, Pennsylvania, Indiana, Kentucky, Michigan, Massachusetts, Colorado, North Carolina, Utah), the rest use progressive brackets, and the top marginal rate ranges from 0% (no-tax states) to 13.3% (California). Personal exemptions, standard-deduction amounts, and state-specific pre-tax conformity (e.g., Pennsylvania doesn't conform on 401(k) contributions) shift the actual tax bill substantially between states with the same headline rate.
Annual income tax vs. paycheck withholding
These two numbers aren't the same. The Income Tax Calculator estimates your total tax bill for the year — what you owe after credits and deductions are applied to your annual income. The Paycheck Calculator estimates per-pay-period withholding — what your employer takes out of each paycheck based on IRS Publication 15-T tables and your W-4. The two should roughly reconcile at tax time, but they typically don't match exactly because withholding tables don't account for credits (Child Tax Credit, EITC, education credits), most itemized deductions, or non-wage income.
Pick the right tool for the question you're asking: "what will I owe this year?" → income tax calculator. "what will hit my bank account on Friday?" → paycheck calculator.
Why state income tax varies so much by state
State income tax differences come down to four factors:
- Whether the state taxes wage income at all. Nine don't. Among those, Washington imposes a 7% capital gains tax on long-term gains above ~$270,000, and New Hampshire's old 5% interest-and-dividends tax was fully phased out at the start of 2025.
- Flat vs. progressive structure. Flat-rate states (e.g., Pennsylvania's 3.07%) tax every dollar of taxable income at the same rate. Progressive-rate states (e.g., California's 1%–13.3%) layer in brackets that compound at higher incomes.
- Standard deduction size. The federal standard deduction is $16,100 single / $32,200 married-filing-jointly for 2026. State standard deductions vary from $0 (e.g. Iowa) to $30,000 MFJ (e.g. Colorado, Idaho), which moves real effective rates substantially.
- Local layers on top. A handful of states permit county or city income tax: NYC and Yonkers in New York, Philadelphia in Pennsylvania, every county and Baltimore City in Maryland, hundreds of municipalities in Ohio, county-level rates in Indiana and Kentucky, several cities in Michigan, and the earnings tax in Kansas City and St. Louis. The per-state pages above flag these where they apply.
What changed for 2026
The One Big Beautiful Bill Act updated federal brackets, the standard deduction, and several credits for the 2026 tax year. All calculators in this hub reflect the current rules. For a full view of 2026-specific updates, see 2026 Tax Calculators. Projected 2027 brackets are also available.
Capital gains and self-employment
Two important slices of income don't fit the standard wage-income bracket math:
Capital gains on investments held longer than a year qualify for preferential rates (0%, 15%, or 20%) instead of ordinary income brackets. The Capital Gains Tax Calculator models the rate, holding period, and the 3.8% Net Investment Income Tax (NIIT) that kicks in above $200,000 MAGI single / $250,000 MFJ.
Self-employment income from freelance work, contracting, or a small business is subject to Schedule SE tax — the 15.3% combined Social Security and Medicare tax that W-2 employees split with their employer but the self-employed owe in full. The Self-Employment Tax Calculator handles the SS wage-base cap, the deductible half, and quarterly estimated payment guidance.
Related categories
Sales tax and other tax types live under Tax Calculators. Per-paycheck withholding by state is in Payroll Calculators. Long-term tax-advantaged saving (401(k), IRA, retirement) is in Savings & Investing.
Frequently Asked Questions
How do I estimate my income tax for the year?
Start from gross income, subtract above-the-line adjustments to get adjusted gross income, then subtract the larger of the standard deduction or your itemized deductions to reach taxable income. Apply the 2026 federal brackets to that figure, then subtract any credits — credits reduce tax owed dollar for dollar, while deductions only reduce the income being taxed. State tax is calculated separately using that state's own brackets and standard deduction, which rarely match the federal ones.
Why does my refund not match what a calculator estimates?
A refund is the difference between what was withheld and what you actually owe, so it depends on your W-4 as much as your tax liability. Two people with identical income and identical tax can see wildly different refunds. Estimates also diverge when there is income the calculator does not know about — freelance work, investment gains, retirement distributions — or credits with eligibility rules that depend on circumstances a generic tool cannot capture.
Do I have to file in more than one state?
Often yes, if you lived or worked in more than one state during the year. Moving mid-year usually means a part-year return in each. Commuting across a state line usually means a nonresident return in the work state plus a resident return at home, with a credit to prevent double taxation — unless the two states have a reciprocity agreement, in which case you file only at home.
Is income tax the same as the tax taken from my paycheck?
No. Paycheck withholding is an estimate your employer remits throughout the year based on your W-4; income tax is what you actually owe once the year is complete. They rarely match exactly, and the gap is what produces a refund or a balance due. Withholding also includes FICA, which is a separate tax from income tax and is not refundable through your return.