If your take-home pay looks a lot smaller than your salary suggests it should, you are running into the same stack of deductions every W-2 worker faces: federal income tax withheld on a progressive scale, a flat 7.65% for Social Security and Medicare, state and often local income tax, and whatever benefits and retirement contributions your employer pulls out before the check hits your account. Together they commonly cut gross pay by 25% to 40%. Some of that is fixed by law. A meaningful share is driven by settings on your W-4 and by how payroll software handles irregular pay, and those pieces you can change.
What’s Actually Coming Out of Each Paycheck
Three federal deductions show up on almost every pay stub, and they work differently from each other.
Federal income tax is progressive. Rates for 2026 run from 10% on the first dollars of taxable income up to 37% on income above $640,600 for single filers and $768,700 for married couples filing jointly.1Internal Revenue Service. Tax Inflation Adjustments for Tax Year 2026 Only the dollars above each threshold are taxed at the higher rate. A raise never pushes your entire income into a new bracket, only the portion that crosses the line.
Social Security and Medicare taxes, together called FICA, are flat and apply to everyone regardless of filing status or W-4 entries. Social Security takes 6.2% of wages up to the annual cap, which is $184,500 in 2026; once your year-to-date earnings pass that number, the 6.2% deduction stops for the rest of the year.2Social Security Administration. Contribution and Benefit Base Medicare takes 1.45% of all wages with no cap, plus an extra 0.9% on wages above $200,000 for single filers and $250,000 for married couples filing jointly.3Office of the Law Revision Counsel. 26 USC 3101 – Rate of Tax For most workers, FICA alone is 7.65% off the top.
Then there’s state and local. State income tax rates run from about 1% to over 13%, and eight states charge none at all. Some cities and counties add their own income tax, and a few states pull small amounts for disability insurance or paid family leave. Individually these are usually under 1.5% of wages, but they stack on top of everything else.
Why One Paycheck Can Feel Worse Than the Others
Payroll software doesn’t know your full-year income. It takes each individual paycheck, multiplies it by the number of pay periods in the year, and calculates federal withholding as if you earn that amount every period.4Internal Revenue Service. Publication 15-T (2026), Federal Income Tax Withholding Methods That math is fine when your pay is steady. When one check is inflated by overtime, commission, or a bonus, the system assumes that inflated number is your new normal and withholds at a rate that fits a much higher annual salary.
Bonuses and other supplemental wages have their own rules. Employers can pick one of two methods.5eCFR. 26 CFR 31.3402(g)-1 – Supplemental Wage Payments Under the flat percentage method, they withhold 22% in federal income tax on supplemental wages up to $1 million per year, and 37% on anything above that.6Internal Revenue Service. Publication 15 (2026), Employer’s Tax Guide If your effective tax rate is well under 22%, that flat rate feels punishing. Under the aggregate method, the employer lumps the bonus into your regular wages for that period and runs the total through the standard tables, which is where annualization can really bite: a $5,000 bonus added to a $2,000 biweekly check makes the software treat you as if you earn $182,000 a year rather than $52,000.
Either way, any excess withheld comes back to you as a refund when you file. That doesn’t help the check in your hand this month.
Pay frequency plays a smaller role. Weekly, biweekly, semimonthly, and monthly paychecks each have their own IRS withholding tables, and the percentage should be roughly the same over the year.4Internal Revenue Service. Publication 15-T (2026), Federal Income Tax Withholding Methods Irregularity within a schedule is what causes the surprises.
How Your W-4 Changes the Number
Form W-4, the Employee’s Withholding Certificate, is the single biggest lever you control over federal withholding.7Internal Revenue Service. About Form W-4, Employee’s Withholding Certificate Filing status, multiple-job entries, and any extra amount you request all feed the payroll formula. Settings that don’t match your real situation are one of the most common reasons a paycheck feels overtaxed.
Filing Status
Your filing status controls the standard deduction the payroll system assumes when estimating your taxable income. For 2026 that deduction is $16,100 for single filers, $32,200 for married filing jointly, and $24,150 for head of household.1Internal Revenue Service. Tax Inflation Adjustments for Tax Year 2026 “Single” and “Married Filing Separately” produce the highest withholding because they assume a smaller deduction and lower bracket thresholds. If you got married, or if you now qualify as head of household, updating the W-4 can noticeably raise your take-home pay.
Multiple Jobs
If you or your spouse hold more than one job, each employer withholds as if its paycheck is your only income, applying the full standard deduction and lowest brackets to its wages. Across all jobs, that means too little is withheld and a bill shows up in April.
Step 2 of the W-4 fixes this. When there are exactly two jobs in the household with roughly similar pay, checking the box in Step 2(c) on both W-4 forms cuts the standard deduction and bracket thresholds in half at each employer.8Internal Revenue Service. Form W-4 (2026) Employee’s Withholding Certificate When the two jobs pay very different amounts, that shortcut can overwithhold. In that case the IRS Tax Withholding Estimator produces a more precise adjustment.9Internal Revenue Service. Tax Withholding Estimator
Extra Withholding
Step 4(c) lets you ask your employer to withhold an additional flat dollar amount from each paycheck.8Internal Revenue Service. Form W-4 (2026) Employee’s Withholding Certificate It’s the right tool if you have side income, investment income, or anything else not subject to withholding, and it can also cover a spouse’s under-withheld job without disclosing the details on the form. It shrinks each check on purpose, and it shrinks or eliminates the April bill.
Pre-Tax Deductions That Lower the Tax Line
Certain employer benefits come out of your paycheck before income tax is calculated, so they reduce the wages your withholding is figured on. Skipping them leaves more of your gross pay exposed.
- Traditional 401(k) contributions come out pre-tax. The 2026 limit is $24,500, with an $8,000 catch-up for workers 50 and older, or $11,250 for those between 60 and 63. Every dollar you defer trims taxable wages for the pay period.10Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026
- Health Savings Account contributions through payroll are excluded from federal income tax and from FICA, which is unusually good treatment. If you’re on a high-deductible health plan, the 2026 limits are $4,400 for self-only coverage and $8,750 for family coverage.11Internal Revenue Service. Notice 2026-05 – HSA Inflation Adjusted Amounts
- Employer-sponsored health, dental, and vision premiums are usually deducted pre-tax automatically.
One thing to check if your paycheck recently shrank: Roth 401(k) and Roth 403(b) contributions do not reduce current taxable income because they come out after tax.12Internal Revenue Service. Retirement Topics – Contributions Switching from traditional to Roth contributions makes each check smaller even though nothing about the tax law changed.
Before You Cut Your Withholding, Know the Penalty
Lowering withholding too aggressively creates its own problem. If you owe more than $1,000 in tax after subtracting withholding and credits, the IRS can charge an underpayment penalty.13Internal Revenue Service. Estimated Taxes14Internal Revenue Service. Quarterly Interest Rates15Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty
The practical move if your check feels too small: pull last year’s return, run the IRS Tax Withholding Estimator with a recent pay stub, and see whether your current W-4 is producing a refund you’d rather have in each paycheck or a shortfall heading toward a penalty. Fix the W-4 accordingly, and if you have room to raise a pre-tax 401(k) or HSA contribution, that shrinks the tax line without shrinking what actually reaches your household.