Your paycheck is four different taxes, not one

Americans often search “paycheck calculator” because the offer letter quoted a salary and the stub did not. Gross pay is split before it reaches the bank: federal income tax, Social Security, Medicare, and — in most states — state income tax. Some cities add another layer. Mixing those into one “tax rate” hides why two jobs with the same salary can deposit different amounts.

This page is the vocabulary next to our 2026 take-home calculator. The tool is a planning estimate. Your payroll vendor uses Form W-4, Publication 15-T tables, and often a local tax engine we do not attempt to clone.

Federal income tax is a bracket, not a flat bill

The United States uses progressive brackets. In tax year 2026 the ordinary rates are still 10, 12, 22, 24, 32, 35, and 37 percent, with inflation-adjusted thresholds and a standard deduction of $16,100 for most single filers ($32,200 married filing jointly, $24,150 head of household), per IRS inflation adjustments in Rev. Proc. 2025-32. Crossing into 22% does not tax your whole salary at 22%. Only the slice above the prior cap uses the higher rate.

That is why “effective rate” on a paycheck tool is more useful than “I am in the 22% bracket.” A $78,000 single filer in a no-income-tax state still has a large standard deduction. A large share of wages is taxed at 10% and 12% before any dollar hits 22%. People who budget as if every dollar were 22% understate take-home and overstate the value of a traditional 401(k) deferral.

Withholding on a real stub is not “annual tax divided by 26.” Employers follow IRS percentage-method or wage-bracket procedures, plus the W-4 you filed: filing status, multiple jobs, dependents, other income, extra withholding. If you started in October, year-to-date tax can look “too high” or “too low” compared with a full-year calculator. That is calendar math, not a broken formula.

FICA does not treat a 401(k) the way income tax does

Social Security is 6.2% of wages up to an annual wage base. The 2026 base used in our calculator is $184,500. Medicare is 1.45% with no wage cap, plus an extra 0.9% Additional Medicare Tax on wages above $200,000 for single filers ($250,000 joint, $125,000 married filing separately). Those extra-Medicare thresholds are in the Internal Revenue Code; they are not the same as the Social Security wage base.

Traditional 401(k) money is usually excluded from federal income tax in the current year. It is still FICA wages. Health premiums run through a Section 125 cafeteria plan often reduce both income tax and FICA. If your stub’s “taxable” box is smaller than gross, read the labels — federal taxable, Social Security taxable, and Medicare taxable are not interchangeable.

High earners sometimes see Social Security withholding stop late in the year once the wage base is hit. Medicare does not stop. A calculator that applies 6.2% to a $250,000 salary without a cap will overstate FICA. Ours applies the cap; your multi-job situation can still differ if two employers each withhold Social Security without seeing the other job.

State tax is the wild card

Nine states levy no tax on wage income, including Texas, Florida, and Washington. California, New York, and Oregon do, with very different tables. A national calculator that ignores the state is quoting a fantasy check for anyone outside a no-tax state.

Our tool uses a simplified state percentage you can override. That is a planning shortcut, not your Form W-2. Progressive state brackets, part-year residency, reciprocity between states, and city taxes (New York City, Detroit, and others) are out of scope. If last month’s stub shows a clear state withholding rate, type that rate in. It will beat a national average every time.

Property tax is not a paycheck item. People in Texas sometimes assume “no state income tax” means a low overall tax burden; the housing payment often tells a different story. Keep paycheck tax and PITI in separate columns when you compare job offers across states.

A worked example you can try

Take $78,000 salary, single, biweekly, Texas, 6% traditional 401(k), $0 pre-tax health. Gross per paycheck is $3,000. The 401(k) takes $180. Federal taxable wages drop; Social Security and Medicare generally still see the $3,000 (minus any cafeteria health). State income tax in Texas is zero. Switch the same person to California and a simplified state percentage appears — take-home falls even if federal and FICA barely move. Then raise the 401(k) chip: federal withholding should drop more than FICA. That split is the whole lesson.

If your real stub disagrees by a few dollars, extra withholding, a city tax, or a W-4 “two jobs” checkbox is the usual reason. If it disagrees by hundreds, check whether the offer was salary or a mix of bonus and equity our annual-salary box does not model.

What this calculator will not do

• Earned income credit, child tax credit, or education credits.
• Itemized deductions, HSAs beyond a simple pre-tax health field, or after-tax Roth 401(k) versus traditional (Roth deferrals do not cut current federal wages).
• A second job’s combined W-4, or self-employment tax for 1099 work.

Open the paycheck calculator, switch Texas to California, then raise the 401(k) chip. The take-home number should move in two different ways: income tax down, FICA almost unchanged.