Most W-2 employees look at exactly two numbers on their pay stub: gross pay and net pay. Everything between those two numbers — the column of deductions that quietly eats 25%–35% of your paycheck — stays a mystery. That mystery costs real money. Pay stub errors are common (2025 ADP data put the rate at roughly 1 in 12 paychecks), and the people who never read their stub never catch them.
This is the line-by-line guide for 2026. Every acronym, every percentage, every threshold. By the time you finish, you'll be able to pick up any pay stub and know exactly what each number means and whether it's right.
The anatomy of a 2026 pay stub
Pay stubs look different between employers (ADP, Gusto, Paychex, Workday all format slightly differently), but every stub has the same six sections:
- Identification — your name, employer, pay period, pay date, and employee ID.
- Earnings — gross wages, broken out by type (regular, overtime, bonus, PTO).
- Pre-tax deductions — 401(k), HSA, health insurance, transit benefits.
- Taxes — federal income tax, FICA, state income tax, local taxes.
- Post-tax deductions — Roth 401(k), garnishments, union dues, life insurance over $50k.
- Totals — net pay (take-home) and year-to-date (YTD) columns.
Deductions are subtracted from your gross pay in a specific order, and that order matters. Pre-tax deductions come out before tax withholding is calculated — that's what makes them "pre-tax." Post-tax deductions come out after taxes are already taken. This single rule is why maxing your 401(k) reduces your tax bill and contributing to a Roth 401(k) doesn't.
Gross pay: where the math starts
Gross pay is your total compensation before any deductions. For a salaried employee paid biweekly (26 pay periods per year):
Gross pay per check = Annual salary ÷ 26
Example: $120,000 salary → $4,615.38 gross per biweekly paycheck.
For hourly workers, gross pay includes regular hours × rate, plus overtime (typically 1.5× the base rate for hours over 40 in a workweek under the Fair Labor Standards Act). Watch this section for:
- Overtime that should be there but isn't — the most common error for hourly staff.
- Bonus or commission rolled in at the wrong rate — supplemental wages get withheld at a flat 22% federal rate up to $1M, not your marginal rate.
- PTO paid at the wrong hourly equivalent — should match your regular rate.
Federal income tax: the biggest line item
The "Fed Income Tax" or "FIT" line is federal withholding — not your actual tax bill. Your actual bill is settled in April. Withholding is your employer's best estimate based on the W-4 you filed.
For 2026, the seven federal brackets are 10%, 12%, 22%, 24%, 32%, 35%, and 37%, applied to taxable income above the standard deduction. The 2026 standard deduction is $16,100 for single filers, $24,150 for heads of household, and $32,200 for married filing jointly. The 37% top bracket doesn't start until $640,600 for singles and $768,600 for joint filers.
Your W-4 tells your employer four things that drive this number: filing status, number of dependents claimed, other income or deductions, and any extra amount you want withheld. A common mistake: people keep an old W-4 after a marriage, divorce, or baby, and end up over- or under-withholding by thousands per year.
Signal that your W-4 is off: if you got a refund bigger than $1,500 or owed more than $1,000 last April, your W-4 needs an update. The IRS's Tax Withholding Estimator does the math for you in about ten minutes.
FICA: OASDI and Medicare
"FICA" is the Federal Insurance Contributions Act — the combined payroll tax that funds Social Security and Medicare. On your stub it usually appears as two separate lines:
OASDI (Old-Age, Survivors, and Disability Insurance) — 6.2%
This is Social Security. You pay 6.2% of your gross wages, and your employer matches it. The key 2026 number: the Social Security wage base is $184,500, up from $176,100 in 2025. Once your YTD earnings cross $184,500, OASDI stops coming out of your paycheck for the rest of the year.
Maximum 2026 OASDI per employee: 6.2% × $184,500 = $11,439. If you're a high earner and your OASDI line stays at 6.2% of gross after your YTD has passed the wage base, that's a payroll error — flag it with HR.
Medicare — 1.45% (plus 0.9% additional)
Medicare has no wage cap. You pay 1.45% of every dollar you earn, forever. If you earn more than $200,000 ($250,000 married filing jointly), an additional 0.9% Medicare surtax kicks in. Your employer withholds the surtax starting when your YTD wages cross $200,000 regardless of your marital status — you'll reconcile the actual threshold on your tax return.
Self-employed? You pay both halves (12.4% OASDI + 2.9% Medicare = 15.3% total), and you deduct half on your tax return. W-2 employees only see the 7.65% employee share on their stub.
State and local income tax
State withholding varies dramatically. As of 2026, nine states have no state income tax on wages: Alaska, Florida, Nevada, New Hampshire (investment income only, now phasing out), South Dakota, Tennessee, Texas, Washington, and Wyoming. Everywhere else, expect a state tax line roughly 2%–10% of gross.
Some cities (NYC, Philadelphia, San Francisco, Kansas City, parts of Ohio) also withhold local income tax. If you live in one state and work in another, you may see withholding for both — reconcile it with a nonresident return in April.
Pre-tax deductions: where smart money lives
Pre-tax deductions lower your taxable income, which is why they're the single highest-ROI item on your stub. For 2026:
- 401(k) / 403(b): Employee deferral limit is $24,500 (up from $23,500 in 2025). Catch-up at 50+ is $7,500. New for 2026 under SECURE 2.0: ages 60–63 get an enhanced catch-up of $11,250.
- HSA (High-Deductible Health Plan required): $4,400 self-only or $8,750 family. Catch-up at 55+ is $1,000.
- FSA (Flexible Spending Account): $3,400 in 2026, with up to $680 carryover if your plan allows it.
- Commuter / transit benefits: up to $340/month in 2026 for qualified transit and parking, each.
- Health insurance premiums: employer-sponsored premiums are almost always pre-tax.
The HSA is quietly the most tax-advantaged account in the U.S. tax code. Contributions are pre-tax, growth is tax-free, and qualified medical withdrawals are tax-free. That's triple tax-advantaged — no other account offers all three.
Post-tax deductions: what they mean and why
Post-tax deductions are subtracted after income tax is calculated, so they don't reduce your tax bill. Common ones:
- Roth 401(k) / Roth 403(b): same contribution limits as traditional 401(k), but taxed now so qualified withdrawals in retirement are tax-free.
- After-tax 401(k): rarer, but valuable for high earners using the "mega backdoor Roth" strategy.
- Wage garnishments: court-ordered deductions for child support, alimony, or defaulted debts. Federal law caps garnishment at 25% of disposable earnings (more for child support).
- Group-term life insurance over $50,000: the IRS imputes income for coverage above $50k, which gets added to your taxable wages and shows up here.
- Union dues, charitable giving, stock purchase plans.
Year-to-date (YTD) columns: the ones most people ignore
Next to every line on a modern pay stub is a YTD column. Check these every few months because they compound errors. The most valuable YTD checks:
- OASDI YTD — should stop increasing once you've paid $11,439 in 2026.
- 401(k) YTD — track progress against the $24,500 limit; if you're on pace to overshoot, reduce your contribution percentage mid-year.
- HSA YTD — same logic; overcontributions get hit with a 6% excise tax each year they stay in the account.
- Federal tax YTD vs expected — if you're far off from what you'll owe, update your W-4 before Q4 to avoid a surprise in April.
Your December pay stub is effectively a preview of your W-2. If your final stub's YTD federal wages don't match Box 1 on your W-2, you have a paperwork problem to flag immediately.
Net pay: what actually hits your bank account
Net pay is everything left after taxes and deductions:
Net pay = Gross pay − Pre-tax deductions − Taxes − Post-tax deductions
For most W-2 employees, net pay runs 65%–75% of gross. The gap widens with higher income (more federal withholding), higher 401(k) and HSA contributions, and in high-tax states. If you want to sanity-check your net pay against expected take-home for 2026, run the numbers through our salary calculator — it applies the 2026 brackets, FICA caps, and standard deduction automatically.
Errors to look for every pay period
Spend two minutes per stub on these four checks:
- Hours and rate — regular and overtime hours match what you worked; rate matches your offer letter or most recent raise letter.
- Pre-tax deductions — 401(k) and HSA amounts match what you elected; health insurance matches your open-enrollment confirmation.
- FICA math — OASDI equals 6.2% of gross (until you hit the $184,500 cap); Medicare equals 1.45% of gross.
- YTD consistency — YTD numbers equal the sum of prior checks; a sudden jump or drop means an adjustment was posted, and you deserve an explanation.
When something looks wrong, email payroll within the same pay period. Fixes processed before the pay cycle closes are cheap; retroactive corrections across multiple stubs are messy and often require a corrected W-2 at year-end.
Key takeaways
- A 2026 pay stub breaks into six zones: identification, earnings, pre-tax deductions, taxes, post-tax deductions, and totals.
- Pre-tax order matters — 401(k) and HSA contributions reduce your taxable income before federal withholding is calculated.
- OASDI is 6.2% up to the $184,500 wage base ($11,439 max for 2026); Medicare is 1.45% on all wages, plus 0.9% over $200,000.
- 2026 limits worth memorizing: 401(k) $24,500, HSA $4,400 / $8,750, FSA $3,400, standard deduction $16,100 / $32,200.
- Check YTD columns every few months and reconcile your December stub to your W-2 — that's where errors surface.
Frequently asked questions
Why did my take-home pay go up in mid-year?
Two common reasons: you hit the Social Security wage base ($184,500 in 2026) and OASDI stopped withholding, or you maxed your 401(k) and those pre-tax deductions stopped. Either way, your federal withholding may also shift because your taxable wages per check changed.
What is "imputed income" on my pay stub?
Imputed income is the cash value of a non-cash benefit that's still taxable to you — most commonly employer-paid group-term life insurance over $50,000, domestic-partner health coverage, or personal use of a company car. It's added to your taxable wages for tax calculation but doesn't increase your actual cash.
Why is my bonus taxed at 40% on my pay stub?
Bonuses are "supplemental wages" and are federally withheld at a flat 22% (up to $1M, then 37%). Add FICA (7.65%) and state tax (varies), and the effective withholding on a bonus often hits 35%–40%. It's withholding, not your actual tax rate — you'll reconcile at filing time.
How do I know if my employer is withholding correctly?
Run your gross pay through the IRS Tax Withholding Estimator or use a 2026 pay stub calculator. If projected annual withholding is within ~$500 of your actual expected tax bill, your W-4 is tuned correctly. If the gap is larger, file an updated W-4.
Can I see how changing my 401(k) contribution affects my net pay?
Yes — that's exactly what a take-home pay calculator is for. Try a few different 401(k) percentages (e.g., 6%, 10%, 15%) in our salary calculator and watch how net pay changes. Most people underestimate how much a 401(k) raise actually costs them in net pay, because the pre-tax shelter absorbs a meaningful chunk of the hit.
Is the OASDI wage base the same as the taxable maximum?
Yes — "OASDI wage base," "contribution and benefit base," "Social Security wage base," and "taxable maximum" all refer to the same number: $184,500 in 2026.