What FICA, federal, and state withholding actually pay for
By the end of this lesson, you'll understand:
In PBS102 you learned to read every section of your pay stub, including the deductions block where taxes live. This lesson unpacks that block: what each tax line actually is, what it's calculated on, and what it funds.
Payroll taxes are usually the largest single category between gross and net pay, so understanding them turns the biggest part of that gap from frustrating into explainable - and helps you recognize a legitimate deduction from one that's worth a second look.
Payroll taxes aren't one deduction - they're several separate, rule-governed contributions, and knowing which is which is how you tell a normal paycheck from one that needs a closer look.
This amount is based on the information you provided on Form W-4 - your filing status, dependents, and any other adjustments - combined with IRS withholding tables that estimate your annual tax liability and spread it across your pay periods.
Unlike FICA, this figure isn't a fixed percentage - it moves with your earnings and your elections, which is why two people with identical gross pay can see different federal withholding amounts.
What to check: note this period's federal withholding amount and compare it to a recent period - a full explanation of what controls this number, and how to adjust it, is coming in PBS104.
FICA stands for the Federal Insurance Contributions Act, and it's made up of two separate taxes: Social Security, withheld at 6.2% of wages up to an annual wage base that adjusts each year (it was $176,100 for 2025 - verify the current figure at ssa.gov before assuming it applies to your situation), and Medicare, withheld at 1.45% of all wages with no cap. Higher earners may also see an additional 0.9% Medicare surtax above a set income threshold.
These aren't arbitrary deductions - Social Security funds retirement, disability, and survivor benefits, while Medicare funds hospital insurance coverage available later in life.
What to check: confirm your stub shows Social Security and Medicare as two separate lines, each calculated on the appropriate wage base for that period.
Whether you see a state income tax line depends entirely on where you live and work - a handful of states, including Texas, Florida, and Washington, don't levy a state income tax, while most others do. Some cities and counties add a local tax on top of that.
Working across state lines adds complexity, since rules about which state taxes your wages vary and sometimes depend on reciprocity agreements between states.
What to check: confirm the state listed on your stub matches the state where you actually live and work - and if that's changed recently, this is worth a closer look, ideally with your payroll department or a tax professional.
Pre-tax and post-tax benefit deductions - health insurance premiums, retirement contributions, HSA or FSA elections - often appear right next to your tax lines on the stub, but they aren't taxes. They're elections you made, and they reduce your net pay for a different reason: because you chose them.
Court-ordered garnishments are another example of a withheld amount that isn't a tax, even though it can look similar on a stub.
What to check: separate lines labeled "Tax" from lines labeled "Deduction" or a benefit name - they're both subtracted from gross pay, but only one category is legally mandatory for everyone.
Your employer also pays payroll taxes on your behalf - a matching share of Social Security and Medicare, plus federal and state unemployment taxes. None of this comes out of your paycheck, but it's part of the true cost of employing you, which becomes relevant later in this course when we look at total compensation.
What to check: this typically won't appear as a deduction on your stub at all, though some employers list it informationally.
Federal withholding, FICA, and state tax together usually account for the largest share of the gap between gross and net pay identified in PBS101. Once each piece has a name, a rate, and a purpose attached to it, that gap stops being one big number and becomes a short, explainable list.
Jordan works as a dispatch coordinator for a regional delivery company - a W-2 role with hourly pay and a regular schedule, even though the work is adjacent to gig-style delivery operations. Jordan is paid biweekly, and this period's gross pay is $1,800.
| Line Item | Amount |
|---|---|
| Gross Pay | $1,800.00 |
| Federal Income Tax | -$158.00 |
| Social Security (6.2%) | -$111.60 |
| Medicare (1.45%) | -$26.10 |
| State Income Tax (4%) | -$72.00 |
| Health Insurance (pre-tax) | -$60.00 |
| Net Pay | $1,372.30 |
Jordan initially assumed "FICA" was a single line item, but the stub breaks it into Social Security and Medicare separately, totaling $137.70 combined - which matches the expected 7.65% of gross pay. Jordan also notices there's no local tax line, unlike a coworker who works in a nearby city with its own local income tax.
Jordan's decision point: rather than assuming the missing local tax line is an error, Jordan confirms with payroll that local tax depends on the specific work location listed on file - a reminder that payroll tax lines depend on real geography, not job title or company headquarters.
FICA is basically the same thing as income tax, just under a different name.
FICA is two separate, fixed-rate contributions tied to specific programs - Social Security and Medicare - while federal income tax withholding is an estimate of your annual tax liability that varies with your earnings and elections. They're calculated differently and fund different things.
I can ask my employer to opt me out of payroll taxes.
FICA and federal and state income tax withholding are legally required for W-2 employees in virtually all circumstances. A small number of narrow exceptions exist for specific religious or student situations, and they don't apply to most workers - check with a tax professional if you have reason to believe one might apply to you.
Money I pay into Social Security and Medicare is money I'll never see again.
These contributions are the funding mechanism for benefits you or your family may draw on later - retirement, disability, and survivor benefits through Social Security, and hospital coverage through Medicare. It's more accurate to think of them as a contribution to a program than as money that has simply vanished.
You likely reached the annual Social Security wage base for that year. Medicare has no such cap, so Medicare withholding continues on every dollar earned.
This depends on state-specific rules and whether the two states have a reciprocity agreement. This is general education only - check with your state's tax agency or a tax professional for guidance specific to your situation.
No. FICA is separate from income tax and funds different programs. Federal income tax withholding does count toward your eventual tax liability, which is the focus of the next lesson.
You simply won't see a state income tax line on your stub, but you'll still see federal withholding and FICA, since those apply regardless of which state you're in.
Locate the federal, Social Security, Medicare, and state tax lines on your current pay stub and confirm each one is labeled and calculated as its own distinct line, not lumped in with anything else.
You now know what each payroll tax line represents - including the federal withholding line, which is the one you actually have some control over. The next lesson shows you exactly how that control works.
That's where Financial Confidence becomes your personal payroll tax guide.
Financial Confidence can help you identify each tax line on your specific pay stub, explain an unfamiliar local tax code, help you track wage base thresholds that apply to you, and point you toward the right resource when a situation calls for professional tax advice.
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