Your pay stub arrives every two weeks — and most people never look past the bottom line. That’s a mistake. Understanding every line on your pay stub helps you catch errors, plan your taxes, and make smarter decisions about your benefits. Here’s a complete breakdown.
Gross Pay vs. Net Pay
Gross pay is your total earnings before any deductions. If you earn $60,000 a year and get paid biweekly, your gross pay per check is $2,307.69.
Net pay is what actually hits your bank account after taxes and deductions. The difference between these two numbers is often surprising — and worth understanding fully.
Federal Income Tax Withholding
The IRS doesn’t wait until April to collect what you owe. Your employer withholds a portion of every paycheck based on your W-4 form. The amount depends on:
- Your filing status (single, married, head of household)
- Allowances or additional withholding you claimed on your W-4
- Your gross income level
If too much is withheld, you get a refund. Too little, and you owe at tax time. Review your W-4 annually — especially after major life changes like marriage, divorce, or a new baby.
Social Security and Medicare (FICA Taxes)
FICA stands for Federal Insurance Contributions Act. Two separate taxes are bundled here:
- Social Security: 6.2% of gross wages, up to the annual wage cap ($168,600 in 2026)
- Medicare: 1.45% of all wages, with an additional 0.9% for earnings above $200,000
Your employer matches both of these on their end — so the full contribution to Social Security per employee is 12.4%.
State and Local Income Taxes
Not every state has an income tax. Florida, Texas, Nevada, and several others have none. If you live in a state that does, your withholding amount depends on your state’s tax tables and your state W-4 equivalent. Some cities (like New York City) add a local income tax on top.
Pre-Tax Deductions
These come out of your paycheck before taxes are calculated, which lowers your taxable income. Common pre-tax deductions include:
- 401(k) or 403(b) contributions — reduces federal and state taxable income
- Health insurance premiums — employer-sponsored plans are typically pre-tax
- HSA contributions — Health Savings Account deposits are triple-tax-advantaged
- FSA contributions — Flexible Spending Account for medical or dependent care
- Dental and vision premiums
If your company offers a 401(k) match, these deductions are effectively free money once you account for the match and the tax savings.
Post-Tax Deductions
These come out after taxes. Examples:
- Roth 401(k) contributions (taxed now, tax-free in retirement)
- Life insurance premiums above the employer-provided base
- Wage garnishments (court-ordered deductions for debt or child support)
- Union dues
Year-to-Date (YTD) Totals
Your pay stub shows both the current-period amounts and the YTD running totals. This matters for:
- Verifying you’re on track with 401(k) contribution limits ($23,000 in 2026; $30,500 if 50+)
- Checking when your Social Security withholding will stop (once you hit the wage cap)
- Reconciling with your W-2 at year-end
How to Catch Errors on Your Pay Stub
Payroll errors are more common than you’d think. Check these every pay period:
- Confirm your hours or salary matches what you expect
- Verify your 401(k) contribution percentage is correct
- Make sure health insurance deductions didn’t change unexpectedly
- Check that your tax filing status matches your W-4
If something looks wrong, contact HR immediately. Errors caught early are much easier to fix.
Reading Your Pay Stub: A Quick Summary
| Line Item | What It Means |
|---|---|
| Gross Pay | Total earnings before deductions |
| Federal Income Tax | IRS withholding based on W-4 |
| Social Security (6.2%) | FICA contribution up to wage cap |
| Medicare (1.45%) | FICA contribution, no cap |
| State/Local Tax | Varies by location |
| 401(k) / Health / HSA | Pre-tax benefit deductions |
| Net Pay | What you take home |
The Bottom Line
Your pay stub is a financial document worth reading. Understanding it helps you maximize pre-tax benefits, catch errors before they compound, and plan your annual tax liability without surprises. Set a reminder to review it at least once a quarter — and every time you change jobs or update your benefits.