“Associate taxes” on your paycheck are simply the payroll taxes your employer withholds from your gross pay before depositing what’s left in your account. “Associate” is a label some companies use in place of “employee,” and the deductions behind it are the standard ones: federal income tax, Social Security, Medicare, and in most places state or local income tax as well.1Your employer withholds federal income tax, Social Security and Medicare contributions, and often state or local taxes, then sends those amounts directly to the relevant government agencies on your behalf. Your employer sends each of those amounts to the appropriate agency on your behalf, which is why the number on your paystub is smaller than the number you technically earned.
The gap between gross and net comes from a handful of predictable line items. Once you can name them, your paystub stops being a mystery.
Federal Income Tax
Federal income tax is usually the largest deduction. It works on a pay-as-you-go basis, meaning a slice comes out of every check instead of arriving as one bill in April. How big that slice is depends on the Form W-4 you filled out when you started the job: your filing status, dependents, whether you hold more than one job, and any extra withholding you asked for.
Your employer runs your W-4 information through IRS withholding tables published in Publication 15-T, which sits alongside the broader employer guide, Publication 15 (Circular E). The tables apply the federal marginal brackets to your paycheck, so income within each bracket is taxed at that bracket’s rate rather than everything being taxed at one flat percentage. For 2026, the brackets run from 10% on a single filer’s first $12,400 of taxable income up to 37% on income above $640,600. For married couples filing jointly, the thresholds are roughly double: 10% starts the schedule and 37% kicks in above $768,700. The standard deduction — $16,100 for single filers and $32,200 for joint filers in 2026 — is already built into the tables, so your employer accounts for it automatically.
Getting this line right matters. If too little comes out over the year, you can owe an underpayment penalty when you file. You avoid that penalty if your total withholding and any estimated payments cover at least 90% of the tax you owe for the current year, or at least 100% of last year’s tax (110% if your adjusted gross income was above $150,000). If too much comes out, you get a refund, but you’ve effectively lent the government money at 0% interest for a year.
Social Security and Medicare (FICA)
Two flat-rate deductions show up on nearly every paycheck under the heading FICA, short for the Federal Insurance Contributions Act. Neither depends on your filing status or dependents.
Social Security tax is 6.2% of your gross wages, and your employer pays a matching 6.2%. In 2026, this tax applies only to the first $184,500 you earn. Once your year-to-date wages cross that ceiling, the 6.2% withholding stops for the rest of the calendar year and your take-home pay ticks up on the remaining checks.
Medicare tax is 1.45% of your gross wages with no income ceiling, and your employer again matches it. Higher earners pay an extra 0.9% Medicare surtax on wages above $200,000 for single filers or $250,000 for joint filers. Your employer starts withholding that additional 0.9% as soon as your wages pass $200,000 in a calendar year, regardless of how you file. If you’re married filing jointly and your household situation means the surtax should really kick in at $250,000, the difference is squared up on your tax return.
Add it up: on the employee side, FICA takes 7.65% of your pay up to the Social Security wage cap, and 1.45% (or 2.35% for high earners) on everything above it.
Pre-Tax Deductions That Shrink Your Taxable Pay
Some deductions come out of your gross pay before taxes are calculated, which lowers the income your employer uses to figure withholding. The result: your tax bill drops in real time.
The most common example is a traditional 401(k) contribution. Money you defer into a traditional 401(k) isn’t included in your federal taxable wages, so it doesn’t appear in Box 1 of your W-2 at year end. For 2026, you can defer up to $24,500, plus an extra $8,000 if you’re 50 or older, or $11,250 if you’re between 60 and 63. One catch that surprises people: 401(k) contributions still count as wages for Social Security and Medicare. You save on income tax, but FICA runs on the full amount.
Health insurance premiums paid through a Section 125 cafeteria plan get a better deal. Those contributions are excluded from federal income tax, Social Security tax, and Medicare tax. Flexible spending accounts for medical or dependent-care expenses work the same way. If your employer offers a cafeteria plan and you enroll, the premium comes off your gross pay before any of those calculations run.
This is also why Box 3 (Social Security wages) on your W-2 is often larger than Box 1 (federal taxable wages). The gap exists because 401(k) deferrals reduce Box 1 but not Box 3.
State and Local Income Tax
Most states impose their own income tax, and your employer withholds it from each paycheck the same way it handles federal tax. Structures vary: some states use a single flat rate, others use graduated brackets that resemble the federal system. About nine states don’t tax wage income at all, so workers there see no state income tax line at all and their states raise revenue through sales taxes, property taxes, or other sources.
Some cities and counties add a local income or payroll tax on top of state tax. These are most common in large metropolitan areas and typically run from about 1% to just under 4% of earnings. Some states forbid local governments from imposing them entirely. If you live in one jurisdiction and work in another, you may owe both, though many states offer credits so you aren’t fully taxed twice. If a local deduction shows up on your stub that you don’t recognize, check with your employer or your state tax agency — the rules are strictly local.
State Disability, Paid Family Leave, and Unemployment
A growing number of states require employees to help fund insurance programs that replace part of your wages during personal illness, family caregiving, or other qualifying leave. On your paystub these usually appear as separate lines with labels like SDI (state disability insurance) or PFL (paid family leave). Rates are small, generally from around 0.2% to 1.3% of taxable wages depending on the state and program. Your employer handles the withholding, but the money comes out of your pay.
These contributions build your eligibility for later benefits. If you need time off to recover from a non-work-related illness, bond with a new child, or care for a seriously ill family member, the accumulated contributions fund the partial wage replacement you receive.
A handful of states also require employees to chip in a fraction of a percent toward state unemployment insurance. In most states, unemployment is funded entirely by employers, but in about three states workers contribute too. The amount is tiny, but it may show up as its own line.
How to Check Whether the Right Amount Is Coming Out
The IRS offers a free Tax Withholding Estimator on its website that walks through your income, deductions, and credits and tells you whether your current withholding is on track. The agency suggests running it every January and any time your life changes in a way that affects taxes: marriage or divorce, a new child, a new job, a big shift in income. If the estimator says to adjust, you file a new W-4 with your employer. There’s no cap on how often you can update it.
Five minutes with the estimator can prevent an unpleasant April. Fall short of the safe-harbor thresholds and you can owe both the unpaid tax and a penalty calculated at the federal short-term interest rate plus three percentage points. On the other end, if you’re getting refunds of several thousand dollars every year, you’re overwithholding.
Year-End Reconciliation on Your W-2
Every January your employer produces a Form W-2 summarizing what you earned and what was withheld the prior year. Federal law requires employers to deliver or mail it by January 31 (rolling to the next business day if the 31st falls on a weekend). For the 2025 tax year, the deadline is February 2, 2026.
The W-2 breaks your earnings into boxes that match the tax calculations behind them. Box 1 shows your federal taxable wages — gross pay minus pre-tax retirement contributions and certain other exclusions. Box 3 shows your Social Security wages, which includes those retirement deferrals because they’re still subject to FICA. Box 5 shows Medicare wages, with no cap. Boxes 2, 4, and 6 show the dollars actually withheld for federal income tax, Social Security, and Medicare. Comparing those boxes against your final paystub of the year is the fastest way to confirm your employer reported everything correctly before you file.