Payroll Tax Calculator
Estimate total payroll tax withholding from a paycheck including Social Security, Medicare, federal income tax, and state income tax. Real withholding depends on W-4 elections, filing status, and the latest IRS tax tables — treat this as a directional estimate rather than precise payroll math.
Last updated: May 2026
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About this calculator
The formula combines several tax components: Social Security 6.2% (employee portion, on wages up to annual wage base — $168,600 for 2024, indexed annually); Medicare 1.45% (no wage cap, plus additional 0.9% on wages above $200,000 single / $250,000 married); state income tax (variable, 0-13% depending on state); federal income tax withholding (approximated as 22% of gross pay adjusted by filing status, with allowance deduction). The actual federal income tax withholding uses IRS Publication 15-T tables based on W-4 elections, which is much more complex than the simplified formula here — real withholding considers pay frequency, taxable wages after pre-tax deductions, W-4 multiple-jobs adjustments, dependent credits, and specific withholding bracket calculations. The calculator approximates this with a 22% effective rate adjusted by filing status; real rates range from 10% (lowest bracket) to 37% (highest bracket). Edge cases: Social Security stops once wages exceed the annual wage base (high earners hit this mid-year and see their take-home rise); additional Medicare applies above thresholds and isn't withheld accurately in early year (settled at year-end via Form 8959); state tax varies widely (9 states have no income tax: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, Wyoming; California tops out at 13.3% for high earners). Pre-tax deductions (401(k), HSA, health insurance) reduce taxable wages before income tax calculation, lowering withholding; the simple formula here doesn't model that. Pay frequency affects per-paycheck calculations but not annual totals; the formula gives per-period tax assuming the rate is the right effective annual rate. For accurate estimates, use the IRS Tax Withholding Estimator (irs.gov), or check actual paystubs against W-4 settings. For self-employment income, the calculation is different — self-employment tax is 15.3% (both employer and employee portions of FICA) plus income tax, paid via quarterly estimated payments rather than withholding. Significant life changes (marriage, divorce, new child, second job) require W-4 update to keep withholding aligned with actual tax liability.
How to use
Example 1 — Single filer, mid-income. Gross pay per pay period $5,000, single filing status, 1 allowance, 5.5% state rate. Enter 5000, single, 1, 5.5. Result: (5000 × 0.062) + (5000 × 0.0145) + (5000 × 0.055) + (5000 × 0.22 × 1) − (1 × 85.40) = 310 + 72.5 + 275 + 1100 − 85.4 = $1,672.10 estimated total tax withholding. ✓ Net pay would be approximately $5,000 − $1,672 = $3,328. Compare against actual paystub; differences typically come from pre-tax deductions (401(k), health insurance) that lower the taxable base, or from W-4 elections that produce different effective rates. Example 2 — Married filing jointly, lower state tax. Gross pay $4,000, married filing jointly, 2 allowances, 3% state rate. Enter 4000, marriedJoint, 2, 3. Result: (4000 × 0.062) + (4000 × 0.0145) + (4000 × 0.03) + (4000 × 0.22 × 0.85) − (2 × 85.40) = 248 + 58 + 120 + 748 − 170.8 = $1,003.20 estimated. ✓ Net approximately $2,997. Married filing jointly typically has lower effective federal rates than single filers due to wider tax brackets, modeled here by the 0.85 multiplier. Real federal withholding is more nuanced — for accurate planning, use the IRS estimator with full W-4 information.
Frequently asked questions
What payroll taxes are mandatory at the federal level?
Several. (1) Social Security tax (also called OASDI — Old Age, Survivors, and Disability Insurance): 6.2% on wages up to the annual wage base ($168,600 for 2024, indexed annually for inflation). Employer matches with another 6.2%. Wages above the base aren't subject to Social Security tax — high earners see take-home increase mid-year when they exceed the base. (2) Medicare tax: 1.45% on all wages (no cap). Employer matches. Additional Medicare tax of 0.9% on wages above $200,000 (single) / $250,000 (married jointly) — only employee pays, no employer match. (3) Federal income tax withholding: based on W-4 elections, filing status, and IRS Publication 15-T tables. Withholding is an estimate of annual tax liability spread across paychecks; actual tax is reconciled on annual Form 1040 with refund or additional payment due. (4) FUTA (Federal Unemployment Tax Act): 6% on first $7,000 of wages, paid by employer only (not visible on paychecks). Employees never pay FUTA directly. Combined employee FICA (Social Security + Medicare) is 7.65% on most wages; combined with federal income tax withholding (typically 10-22% for middle incomes, higher for high earners), total federal withholding usually 15-30% of gross pay before state taxes.
How do state and local payroll taxes vary?
Wide variation. State income tax: 9 states have no state income tax (Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, Wyoming); New Hampshire and Tennessee tax investment income but not wages. Among states with income tax, rates range from flat 2.5-5% (Indiana, Illinois, Michigan, Pennsylvania, Utah) to highly progressive systems topping out at 13.3% in California, 10.9% in New York, 11% in Hawaii, 9.85% in Minnesota. Some states (NJ, NY, CA, OR) have additional disability or paid family leave taxes (typically 0.5-1.5% employee contribution). Local taxes apply in some jurisdictions: New York City and Yonkers (NY), several Pennsylvania municipalities (especially Philadelphia at 3.79%), some Ohio cities (Cincinnati, Cleveland, Columbus), Michigan local taxes (Detroit). State unemployment insurance (SUI/SUTA) is employer-paid only in most states but employees contribute in Alaska, New Jersey, Pennsylvania. For employees living in one state and working in another, both states' rules may apply; reciprocity agreements between some states simplify this. Total state and local payroll tax burden ranges from 0% (no-tax states) to 15%+ (high-tax states with city taxes). Tax planning often considers state implications for major decisions like remote work location and relocation.
Why doesn't my actual paycheck withholding match this calculator?
Several reasons. (1) The calculator uses a simplified 22% federal effective rate; real federal withholding uses IRS Publication 15-T tables that account for filing status, pay frequency, W-4 dependents/credits, and specific bracket calculations. Real effective rates range from 10% (low earners) to 37% (high earners). (2) Pre-tax deductions lower taxable wages; the calculator doesn't model 401(k) contributions (typically 6-15% of pay), health insurance premiums ($100-500+ per pay period), HSA/FSA contributions, transit benefits. These reduce taxable base, lowering both income tax and (for some categories) FICA withholding. (3) W-4 elections matter beyond simple allowance count; modern W-4 (post-2020 redesign) uses dependent credits and multiple-jobs adjustments rather than allowances. (4) Bonus pay is often withheld at 22% supplemental rate (or 37% if over $1M annual), not regular bracket-based withholding. (5) State withholding uses state-specific tables and rules. (6) Social Security stops above wage base; high earners see year-end take-home increase. (7) Additional Medicare (0.9% above thresholds) isn't fully withheld in real time. For accurate paycheck planning, use the IRS Tax Withholding Estimator at irs.gov; for full tax planning, work with a CPA, especially for complex situations (self-employment income, multiple jobs, equity compensation, capital gains).
What are the most common mistakes employees make with payroll tax withholding?
The biggest is failing to update W-4 after life changes; marriage, divorce, new child, side income, spouse's job changes all affect optimal withholding. Outdated W-4 produces over- or under-withholding, with the latter resulting in penalty risk at tax time. The second is treating large tax refunds as "good"; a refund means you over-withheld and gave the IRS an interest-free loan all year. Adjusting W-4 to break even (or owe a small amount) keeps more money in your pocket throughout the year. The third is under-withholding deliberately to "use" the money during the year, then being unable to pay at tax filing; underpayment penalties apply when you owe more than $1,000 or paid less than 90% of current year liability / 100% of prior year. The fourth is ignoring state-specific rules for multi-state workers (remote workers living in one state, working for company in another); this can produce tax surprises. The fifth is over-relying on calculators and not checking actual paystubs against expected withholding; differences accumulate over the year. The sixth is forgetting that bonuses and supplemental wages have special withholding rules; flat 22% (or 37% for over $1M) withholding on bonuses may be more or less than your normal effective rate. The seventh is neglecting to claim eligible pre-tax benefits (401(k), HSA, transit) that reduce taxable wages and reduce overall tax burden. The eighth is panicking about year-end tax balance without understanding withholding mechanics; W-4 adjustments can right-size the situation for following year.
When should I not use this calculator?
Skip it for precise paycheck planning where accuracy under $50 matters; this is a directional estimate that misses many nuances of real payroll tax calculation. Use the IRS Tax Withholding Estimator or your actual paystub for precision. It is the wrong tool for self-employment income; self-employment tax is 15.3% (both employer and employee FICA portions) plus income tax, paid via quarterly estimated payments rather than withholding. Do not use it for non-cash compensation (stock options, RSUs, fringe benefits); these have special tax treatment requiring specialized calculation. For high earners ($200k+ for singles, $250k+ for married), the additional Medicare tax (0.9%) applies above thresholds and isn't modeled here; also, Social Security cuts off at the wage base, materially changing withholding patterns. For low-income workers eligible for Earned Income Tax Credit or other tax credits, the calculator significantly overstates effective tax burden; actual liability may be much lower or zero. For state-specific planning (residence change, multi-state work), state-specific resources or a CPA are better than this generalized calculator. For tax-equalization or expat situations (US citizen working abroad, foreign worker in US), specialized tax expertise is essential. And for any high-stakes financial decision (large bonus, equity event, retirement timing), consult a CPA — payroll calculators give rough estimates but real tax planning involves more than withholding math.