Your pay stub might look like a wall of numbers, but every line tells you something important about your money. Once you know what to look for, reading your pay stub takes about two minutes and can prevent costly mistakes — from missed deductions to incorrect tax withholding.
The Two Main Sections: Gross Pay vs. Net Pay
The most important numbers on your pay stub are at the top and bottom.
Gross pay is what you earned before any deductions. If your salary is $60,000 per year and you’re paid biweekly, your gross pay per check is $2,307.69.
Net pay is what actually hits your bank account. After taxes, health insurance, retirement contributions, and other deductions, that same $2,307.69 might become $1,650. The gap between gross and net is where most of your financial decisions live.
Federal and State Tax Withholding
Your employer withholds income taxes from each paycheck based on the information you provided on your W-4 form.
- Federal income tax: Withheld based on your W-4 elections and current IRS tax tables. The amount depends on your filing status (single, married filing jointly, etc.) and any additional withholding you requested.
- State income tax: Withheld if your state has an income tax. Nine states — including Texas, Florida, and Washington — have no state income tax, so this line would be blank.
- Local income tax: Some cities and counties levy their own income tax. If you live in New York City, Philadelphia, or certain Ohio cities, you may see this line.
If you got a big refund last year, you likely over-withheld. If you owed money, you under-withheld. Either situation is a signal to update your W-4.
FICA Taxes: Social Security and Medicare
These two deductions are non-negotiable — every employed worker pays them.
- Social Security tax: 6.2% of your gross wages, up to the Social Security wage base ($168,600 in 2024). Once you hit that ceiling during the year, this deduction stops.
- Medicare tax: 1.45% of all gross wages, with no cap. High earners pay an additional 0.9% Medicare surtax on wages above $200,000.
Together, these are called FICA taxes. Your employer matches both amounts — so the full Social Security contribution is 12.4% of your wages, split evenly between you and your employer.
Pre-Tax Deductions
Pre-tax deductions reduce your taxable income, which is why they appear before the tax calculations on most pay stubs.
- 401(k) or 403(b) contributions: Money going into your workplace retirement account. This reduces your federal and state taxable income dollar for dollar.
- Health insurance premiums: Your share of employer-sponsored health, dental, and vision coverage. Usually deducted pre-tax under a Section 125 cafeteria plan.
- HSA contributions: Contributions to a Health Savings Account, if you’re enrolled in a high-deductible health plan.
- Flexible Spending Account (FSA): Pre-tax set-asides for medical or dependent care expenses.
- Commuter benefits: Pre-tax money for transit passes or parking.
Post-Tax Deductions
These come out after taxes are calculated, so they do not reduce your tax bill.
- Roth 401(k) contributions: After-tax retirement contributions. You pay tax now but withdrawals in retirement are tax-free.
- Life insurance (above $50,000 in coverage): Employer-provided life insurance over $50,000 generates imputed income, which is taxable.
- Wage garnishments: Court-ordered deductions for child support, student loans in default, or unpaid taxes.
Year-to-Date (YTD) Totals
Most pay stubs include a YTD column showing your running totals for the calendar year. This is where you track:
- How close you are to the Social Security wage base (after which SS withholding stops)
- Whether you’re on track with retirement contributions vs. the annual IRS limit ($23,000 for 401(k) in 2024)
- Total taxes withheld so far — useful for tax planning mid-year
Common Pay Stub Errors to Watch For
Payroll errors are more common than most employees realize. Check for these issues:
- Wrong filing status: If your W-4 still shows “single” but you got married, you’re probably over-withholding.
- Missing employer match: Your 401(k) contributions should show up, and so should your employer’s match (sometimes on a separate line).
- Incorrect deduction amounts: Open enrollment changes don’t always get applied correctly. Verify your health insurance premium matches what HR told you.
- Continued deductions after salary cap: Social Security withholding should stop once you hit the annual wage base. If it doesn’t, notify payroll.
How Pay Frequency Affects Your Taxes
Whether you’re paid weekly, biweekly, semimonthly, or monthly affects how your withholding is calculated each period, even if your annual salary stays the same. If your employer changes your pay schedule, update your W-4 to avoid a surprise tax bill.
What to Do If Something Looks Wrong
Contact your HR or payroll department with a specific question: “My pay stub shows $X withheld for health insurance but my benefits confirmation shows $Y. Can you verify which is correct?” Be specific, because vague questions take longer to resolve.
For tax withholding errors, use the IRS Tax Withholding Estimator to calculate the correct W-4 settings, then submit a new W-4 to your employer.
The Bottom Line
Reading your pay stub is one of the most underrated financial habits you can build. It takes two minutes per paycheck, catches errors before they compound over the year, and keeps you informed about where your money is actually going. Your net pay is just the starting point — the real financial picture is in the details above it.
Related: What Is a Money Market Account?