Most people glance at their pay stub to confirm the deposit amount and move on. That is understandable but leaves a lot of useful information unread. A pay stub is a financial snapshot that shows your effective tax rate, the cost of every benefit your employer provides, your retirement contribution progress, and often a clue about whether your withholding is set correctly. Reading it properly takes about five minutes and is worth doing at least once a year.
The Basic Structure
Pay stubs follow a consistent pattern regardless of employer, though the exact layout varies. The core sections are:
- Earnings: What you made this period and year-to-date
- Pre-tax deductions: Amounts removed before taxes are calculated
- Taxes: Federal, state, and payroll taxes withheld
- Post-tax deductions: Amounts removed after taxes are calculated
- Net pay: What ends up in your bank account
Earnings Section
This section shows your gross pay for the current period (before any deductions) and the running year-to-date total. If you are salaried, the current-period gross is your annual salary divided by the number of pay periods. If you are hourly, it shows hours worked multiplied by your rate, plus any overtime at the applicable rate (typically 1.5x your base rate for hours over 40 per week).
Verify that the current-period gross matches what you expect. Payroll errors are rare but do happen. Catching a missed raise or an incorrect hours entry requires looking at this section.
Pre-Tax Deductions
These are removed from your gross pay before federal and state income taxes are calculated, which reduces your taxable income. Common pre-tax deductions include:
| Deduction | What It Is | Tax Benefit |
|---|---|---|
| 401(k) / 403(b) | Retirement contribution | Reduces federal and state income tax; not FICA |
| HSA | Health Savings Account | Reduces income tax AND FICA taxes |
| FSA | Flexible Spending Account (health or dependent care) | Reduces income tax and FICA |
| Medical insurance premium | Your share of employer health plan | Usually pre-tax under Section 125 |
| Dental and vision premiums | Your share of dental/vision plans | Usually pre-tax |
The total of these deductions reduces the income figure that your tax withholding is calculated on. A $500 bi-weekly 401(k) contribution reduces your taxable income by $13,000 per year. At a 22 percent marginal rate, that is roughly $2,860 in annual tax savings reflected in your withholding.
Taxes Section
This section lists each type of tax withheld and the current-period amount plus year-to-date total.
- Federal income tax: Calculated based on your W-4 withholding elections and the IRS withholding tables. This is an estimate; your actual liability is settled when you file your tax return.
- State income tax: Applies in most states. A few states (Texas, Florida, Nevada, and others) have no state income tax.
- Social Security (OASDI): Fixed at 6.2 percent of wages up to the annual wage base ($168,600 in 2025, adjusted annually). Once you hit the wage base mid-year, this deduction stops.
- Medicare (HI): Fixed at 1.45 percent of all wages with no cap. An additional 0.9 percent applies to wages above $200,000 for single filers.
Social Security and Medicare combined are called FICA taxes. They total 7.65 percent of your gross wages (up to the Social Security wage base). Your employer matches this amount, paying an additional 7.65 percent on your behalf directly to the government.
Post-Tax Deductions
These come out after taxes are calculated and therefore provide no income tax reduction. Common examples include Roth 401(k) contributions, union dues, garnishments, and some supplemental insurance premiums. If you see deductions here that you do not recognize, check with HR.
Using Your Pay Stub to Check Withholding
The federal income tax withheld column is one of the most actionable numbers on your pay stub. Multiply your current-period withholding by your number of annual pay periods to project your total annual federal withholding. Compare that to your estimated annual tax liability (your tax software or a rough calculation using the IRS tax brackets).
If projected withholding is significantly higher than your estimated liability, you are on track for a large refund. That means you are giving the government an interest-free loan each month. Adjusting your W-4 allowances to reduce withholding increases your take-home pay now without changing your ultimate tax obligation.
If projected withholding is significantly lower than your estimated liability, you may owe a large balance at filing and potentially underpayment penalties. Increasing your W-4 withholding now avoids that surprise.
Checking your pay stub once a year, particularly after a pay raise, a change in benefits enrollment, or a life event like marriage or a new child, takes five minutes and keeps your finances calibrated to your actual situation rather than running on stale assumptions.