Calculate your exact take-home pay after federal income tax, state tax, Social Security, and Medicare withholding. Updated for 2026 tax law.
Your paycheck withholding for 2026 is governed by the One Big Beautiful Bill Act and your W-4 elections. Federal income tax withholding is estimated by annualizing each paycheck, applying the 2026 tax brackets, and dividing by pay periods. FICA taxes include Social Security (6.2% up to $184,500) and Medicare (1.45% on all wages). Pre-tax deductions like 401(k) contributions and health insurance premiums reduce your taxable wages, effectively giving you a tax break. State income tax withholding varies by state — nine states have no income tax at all. Understanding your paycheck breakdown helps you optimize W-4 withholding to avoid owing taxes or receiving a large refund.
Paycheck withholding is calculated using the IRS Percentage Method from Publication 15-T, applied every pay period. Your employer follows a precise sequence. First, gross wages are determined for the pay period — annual salary divided by the number of pay periods (26 for biweekly, 24 for semimonthly, 12 for monthly, 52 for weekly). Second, pre-tax deductions are subtracted from gross wages: 401(k) contributions, health insurance premiums, HSA and FSA contributions, and commuter benefits all reduce the taxable wage base before any tax is computed. Third, the remaining wages are annualized and the W-4 Step 3 dependent credits are applied annually. Fourth, the IRS withholding tax tables are applied to compute estimated annual federal income tax, which is then divided by pay periods to get the per-check withholding amount.
FICA taxes are computed separately and are straightforward percentages: Social Security at 6.2% on cumulative wages up to the $184,500 wage base, and Medicare at 1.45% on all wages with no cap. State income tax withholding follows each state's own withholding tables. The full formula is:
A critical distinction: pre-tax deductions reduce your taxable wages before withholding is calculated, so a $500 401(k) contribution does not reduce take-home pay by $500. At the 22% bracket, it reduces take-home by roughly $355 because $145 of that $500 would have gone to taxes anyway.
Marcus earns $75,000 annually, paid biweekly (26 pay periods), single filer, contributes $500 per paycheck to a traditional 401(k), and claims two children under 17 on his W-4 Step 3 ($4,400 total).
The $500 biweekly 401(k) contribution only reduces Marcus's take-home by about $355 — not $500 — because $145 of that $500 would have been paid in federal and state taxes anyway. His annual 401(k) savings of $13,000 costs him only about $9,230 in actual take-home pay reduction.
If Marcus forgot to enter his two children on W-4 Step 3, his federal withholding would be about $346/check instead of $177/check — he'd over-withhold by $4,394 annually and receive a large refund instead of having that money each paycheck throughout the year.
Pre-tax deductions (401k, HSA, health insurance)
Every dollar contributed pre-tax to a 401(k), HSA, or employer health insurance reduces both federal and state taxable wages. The 2026 401(k) limit is $23,500 ($31,000 if age 50+). At the 22% federal bracket plus a 5% state rate, maximizing the 401(k) saves roughly $6,345 in combined income taxes — meaning $23,500 in retirement savings only reduces take-home pay by about $17,155.
W-4 Step 3 dependent credits
The W-4 Step 3 child credit ($2,200 per qualifying child under 17 in 2026) directly reduces annual withholding dollar-for-dollar. For each child entered, your employer reduces your annual withholding by $2,200, spread evenly across your paychecks. With two children, that's $169 more per biweekly paycheck throughout the year rather than waiting for a lump-sum refund at tax time.
Pay frequency
Pay frequency affects paycheck size but not annual take-home. Biweekly (26 checks/year) results in smaller individual checks than semimonthly (24 checks), but two months per year have three biweekly checks. Monthly pay (12 checks) gives the largest individual checks but requires more careful monthly budgeting. Your annual net pay is the same regardless of frequency for identical withholding elections.
Social Security wage base cap
The 2026 Social Security wage base is $184,500. Once your cumulative wages for the year cross this threshold, the 6.2% Social Security withholding stops for all remaining paychecks. For an employee earning $220,000, this means paychecks from October onward are $11,439 higher annually than if Social Security continued — a meaningful boost in second-half take-home pay for high earners.
State income tax
Nine states have zero income tax withholding (Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, Wyoming). High-tax states like California (up to 13.3%) and New York (up to 10.9%) can reduce monthly take-home pay by $600–$1,500+ for middle and high earners compared to living in a no-income-tax state with otherwise identical circumstances.
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Federal income tax withholding is calculated by annualizing your paycheck gross pay, subtracting your standard deduction and W-4 Step 3 credits, computing the federal income tax on that annualized taxable income, then dividing by your pay periods. Your W-4 form elections (filing status, dependents, extra withholding) directly control how much federal income tax is withheld. Using the 2026 paycheck calculator shows you exactly how changes to your W-4 affect each paycheck.
FICA (Federal Insurance Contributions Act) tax funds Social Security and Medicare. For 2026, Social Security tax is 6.2% on wages up to the $184,500 wage base. Medicare tax is 1.45% on all wages with no cap. High earners also pay an additional 0.9% Medicare surcharge on wages over $200,000 (single) or $250,000 (married). Your employer matches your FICA contributions, paying another 7.65% on top. FICA taxes appear on your W-2 in Boxes 4 and 6.
To increase your take-home pay: (1) Maximize pre-tax deductions — 401(k) contributions up to $23,500, HSA contributions up to $4,300, and health insurance premiums all reduce taxable income. (2) Update your W-4 to claim eligible dependents in Step 3 ($2,200 per child under 17). (3) Use a Health FSA for medical expenses. (4) Check if you qualify for commuter benefits. Note: reducing withholding increases take-home pay but may result in a smaller refund or tax owed at filing.
The Social Security wage base for 2026 is $184,500. This means Social Security tax (6.2%) is only withheld on the first $184,500 of your wages. Once your cumulative wages exceed $184,500 for the year, Social Security withholding stops for the remainder of the year. Medicare tax (1.45%), however, has no wage cap and is withheld on all wages throughout the year.
Traditional 401(k) contributions are pre-tax, reducing your federal and state taxable income each paycheck. For example, a $500 biweekly 401(k) contribution reduces your taxable wages by $500, saving you roughly $110–$185 in federal income tax (depending on your bracket) plus state income tax savings. Your net take-home reduction is only $315–$390 per paycheck, while $500 goes into your retirement account. The 2026 401(k) contribution limit is $23,500 ($31,000 if age 50+).