Your paycheck is smaller than your salary, and that gap is not a mystery—it is a series of specific deductions, each with a purpose and a paper trail. Most people glance at the net figure, confirm it looks roughly right, and move on. But the lines above that figure explain where your money went, whether your withholding is set up correctly, and whether you are on track for a refund or a surprise bill next spring. Learning to read those lines takes about fifteen minutes and pays off every pay period.

Start With the Two Numbers That Matter Most

Every pay stub is built around two figures: gross pay and net pay. Gross pay is what you earned before anything is taken out. For hourly workers, it is hours worked multiplied by your rate, with overtime at 1.5 times the regular rate for hours over 40 in a week. For salaried employees, it is your annual salary divided by the number of pay periods—26 for biweekly, 24 for semimonthly . Bonuses and commissions appear as separate line items added to your base pay.

Net pay is what actually lands in your bank account after all deductions. The distance between gross and net is where the complexity lives, and understanding that distance is the whole point of reading a stub.

The Taxes You Cannot Avoid

Three federal taxes appear on nearly every paycheck, and they are not optional.

Federal income tax is withheld based on the W-4 form you completed when you were hired. Your employer uses IRS withholding tables to calculate the amount, which varies by your filing status and the adjustments you claimed . This is not a fixed rate—it is an estimate of what you will owe for the year, and it can be adjusted if it turns out to be wrong.

Social Security tax is 6.2% of your gross wages, up to an annual wage ceiling of $184,500 in 2026. Your employer pays a matching 6.2%, but that half does not appear on your stub . Once your year-to-date wages exceed the ceiling, this deduction stops for the rest of the year.

Medicare tax is 1.45% of all wages, with no income cap. If you earn above $200,000 in a year, an additional 0.9% applies to wages above that threshold, paid entirely by you .

Depending on where you live, you may also see state income tax and, in some cities, local income tax. These vary widely—some states have no income tax at all, while others have rates that meaningfully change your take-home pay .

Pre-Tax vs. Post-Tax Deductions

The deductions section is where most confusion occurs, and the key distinction is timing.

Pre-tax deductions come out before income taxes are calculated. This means they reduce your taxable income, so you pay less in federal and state income tax on the money you earn. Common examples include your share of health, dental, and vision insurance premiums, traditional 401(k) or 403(b) contributions, Health Savings Account (HSA) contributions, and Flexible Spending Account (FSA) contributions . If you contribute $100 to a traditional 401(k) from a paycheck, your taxable income drops by $100, and your tax withholding drops accordingly.

Post-tax deductions come out after taxes are calculated and do not reduce your taxable income. Examples include Roth 401(k) contributions (you pay tax now, but withdrawals in retirement are tax-free), certain life or disability insurance premiums, union dues, and wage garnishments . These reduce your take-home pay without any offsetting tax benefit.

The practical implication is that pre-tax deductions are generally more valuable per dollar, because they lower your tax bill as well as your take-home pay.

Why Your Withholding Might Be Wrong

The federal income tax withheld from your paycheck is an estimate, and estimates can be off in either direction. Withhold too little and you may owe a lump sum at tax time, possibly with a penalty. Withhold too much and you have given the government an interest-free loan for the year.

The IRS Tax Withholding Estimator is a free tool that helps you check whether your current withholding matches your likely tax liability. It is particularly useful if you have more than one job, a working spouse, recent life changes like marriage or a new child, or income without automatic withholding such as freelance or gig work . The estimator walks through your income, deductions, and credits, then recommends whether to adjust your W-4 and how to do it.

The 2026 version reflects changes under recent tax legislation, including deductions for qualified tips and overtime, which may affect workers in tipped positions or those who regularly work overtime . If your situation has changed since you last submitted a W-4, a few minutes with the estimator can prevent a surprising tax bill.

Year-to-Date Figures Are Your Early Warning System

Most pay stubs include a year-to-date (YTD) column alongside the current period figures. These running totals show how much you have earned, paid in taxes, and contributed to benefits since January 1 .

YTD figures serve a specific purpose: they let you spot problems before they become serious. If your YTD federal withholding looks low relative to your YTD gross pay, you may be under-withholding and heading toward a balance due. If your YTD 401(k) contributions are far below where you intended them to be, you can increase them while there is still time to matter for the year. Checking the YTD column every few pay periods is a simple habit that prevents end-of-year surprises.

A Note on Tax Brackets

A common misconception is that moving into a higher tax bracket means all your income is taxed at that higher rate. It does not. The U.S. uses marginal tax rates, meaning only the income within each bracket is taxed at that bracket’s rate. For 2026, the brackets for single filers start at 10% on income up to $12,400, then 12% on income over that up to $50,400, then 22% up to $105,700, and so on . If your taxable income is $60,000, you do not pay 22% on the whole amount—you pay 10% on the first portion, 12% on the next, and 22% only on the portion above $50,400.

This matters for understanding your paycheck because your withholding is calculated using these brackets. It also explains why a raise does not reduce your take-home pay, a fear that occasionally circulates but has no basis in how marginal rates work.

The standard deduction further reduces what you owe. For 2026, it is $16,100 for single filers, $32,200 for married couples filing jointly, and $24,150 for heads of household . This is subtracted from your income before tax brackets are applied, which is why many lower-income workers owe little or no federal income tax.

Frequently Asked Questions

Why is my first paycheck of the year different from later ones?

Several deductions have annual wage limits. Social Security tax stops once your YTD wages exceed $184,500, so if you are a high earner, your take-home pay increases later in the year. Some benefits may also have annual contribution limits that, once reached, stop being deducted .

What does FICA mean on my pay stub?

FICA stands for the Federal Insurance Contributions Act, and it refers collectively to Social Security and Medicare taxes. The line may be split into “FICA” (Social Security) and “FICA-MED” (Medicare), or labeled “OASDI” for Social Security . These are separate from federal income tax and fund specific programs rather than general government revenue.

Can I change how much tax is withheld from my paycheck?

Yes. You can submit a new W-4 to your employer at any time to adjust your withholding. The IRS Tax Withholding Estimator can help you determine the right amount, particularly if you have multiple income sources or have experienced a life change .

Why is my net pay lower than I calculated?

Check three things: whether your pre-tax deductions are larger than you expected (health premiums and 401(k) contributions can be substantial), whether your W-4 withholding is set higher than necessary, and whether there are post-tax deductions like garnishments or union dues you may have forgotten . Your pay stub itemizes every deduction, so the answer is always on the page.

Do I need to keep my pay stubs?

Yes. Pay stubs are proof of income for loan applications, rental agreements, and assistance programs, and they are useful for verifying your W-2 at tax time . Many payroll systems keep them accessible online, but downloading and saving them periodically is a sensible habit.

Final Thoughts

A paycheck is a record of a series of decisions—yours, your employer’s, and the government’s—compressed into a single document. The gross-to-net gap is not arbitrary. It reflects tax withholding you can adjust, benefit contributions you chose, and limits that reset each year. The most useful habit is not memorizing every line but checking the YTD column every few pay periods and confirming that the withholding matches your actual situation. That small check is what separates a tax-time surprise from a tax-time confirmation.