How Paycheck Taxes Work in 2026: Every Deduction, Explained

Your salary is one number. Your paycheck is a smaller one. Everything between the two is a short list of deductions applied in a fixed order, and once you can follow that order, you can predict any paycheck in America within a few dollars. Most people never learn the order, so their paycheck stays a black box their whole working life, and every raise, bonus, and benefits election becomes a guess.

This guide walks the full path from gross pay to take-home twice: once with a single filer earning $65,000, and once with a married couple with two kids. Along the way you will see exactly where gross becomes net, which numbers reset every January, and which levers you personally control.

Step one: the standard deduction comes off first

Federal income tax never applies to your whole salary. In 2026 the standard deduction is $16,100 for single filers and $32,200 for married couples filing jointly. Our single filer is taxed on $48,900, not $65,000. This single fact explains why paycheck math always looks worse than it is when you do it in your head, and why “I’m in the 22% bracket so I lose 22%” is wrong for almost everyone who says it.

The standard deduction adjusts for inflation each year, which is one of two quiet reasons your first January paycheck is often slightly larger than December’s even without a raise. The other is the bracket thresholds moving, which we cover next.

Step two: brackets tax slices, not your whole income

The United States uses marginal brackets. Each slice of income is taxed at its own rate, and only the dollars inside a bracket pay that bracket’s rate:

Our single filer pays 10% on the first $12,400 ($1,240) and 12% on the remaining $36,500 ($4,380), for $5,620 of federal tax. That is an effective federal rate of about 8.6% of salary, even though they are “in the 12% bracket.” The gap between marginal and effective rates decides whether overtime is worth it, whether a raise can ever hurt you (it cannot), and how much a deduction really saves, so we wrote a full guide to marginal vs effective rates.

Step three: FICA takes 7.65%, no deductions allowed

Social Security (6.2%) and Medicare (1.45%) are calculated on gross pay, before the standard deduction does you any favors. For 2026, Social Security stops at the $184,500 wage base, and an extra 0.9% Medicare surtax starts above $200,000 of wages. Our filer pays $4,030 to Social Security and about $943 to Medicare.

Two things about FICA surprise people. First, your employer pays a matching 7.65% on top of your wages that you never see. Second, high earners get a mid-year “raise” when their year-to-date wages cross the wage base and the 6.2% stops; the money was always theirs, it just stops being withheld. The full mechanics, including what self-employed people pay, are in our FICA explainer.

Step four: your state takes its cut (or doesn’t)

State tax is where two identical salaries diverge. The landscape splits three ways:

Michigan charges its flat 4.25% after a $5,800 exemption, about $2,516 on our example. Florida charges nothing. Run the same salary through the Michigan paycheck calculator and the Florida paycheck calculator and the gap is about $97 every two weeks. We break the two models down in the Michigan guide and the Florida guide, and the tradeoffs of moving for taxes in the nine states with no income tax. Watch for one more layer: some cities (Detroit, New York, Philadelphia among them) add a local income tax on top.

Step five: pre-tax deductions shrink the taxable pile

A traditional 401(k) contribution, health and dental premiums, FSA and HSA dollars all come out before federal and state income tax is computed. That is why a $200 contribution does not cost $200 of take-home; at a 12% federal plus 4.25% state marginal rate, it costs closer to $167. Retirement contributions still pay FICA; most health premiums escape even that. The full math, including how the savings scale with your bracket, is in what a 401(k) really costs per paycheck.

Worked example one: single, $65,000, Michigan

Worked example two: married, $65,000, two kids

Same salary, different household, very different check. The married standard deduction of $32,200 cuts taxable income to $32,800. Federal tax before credits is $2,480 + 12% of $8,000 = $3,440. Then the child tax credit removes $2,000 per qualifying child under 17, taking federal tax to virtually zero if withholding is set correctly on the W-4. FICA does not care about any of this and stays at $4,973. Michigan allows exemptions per person, trimming its bite too. Net effect: this household keeps roughly $4,500 to $5,500 more per year than the single filer on the identical salary. Enter dependents in the calculator above and watch the federal line collapse.

Withholding: why your check is an estimate, not a bill

Each paycheck’s federal tax line is your employer’s estimate of your annual liability, sliced per pay period and guided entirely by your W-4. If checks feel too small all year and April brings a fat refund, you gave the IRS a free loan. If checks feel great and April brings a bill, your W-4 underestimated. The fix is the same form either way: adjust dependents, second-job settings, or use line 4(c) to add a fixed extra amount per check, which we cover in when extra withholding makes sense. Bonuses run through a separate flat-rate system explained in why bonuses are taxed at 22%.

Pay frequency changes the check, not the total

Biweekly (26 checks), semimonthly (24), weekly (52), and monthly (12) all divide the same annual math into different slice sizes. A $65,000 salary is $2,500 biweekly but $2,708 semimonthly, and biweekly workers get two glorious three-check months per year. None of it changes annual take-home by a cent; the mechanics are in biweekly vs semimonthly pay.

The mistakes that cost real money

Five errors show up constantly. Declining a 401(k) match because “I can’t afford the deduction,” when the pre-tax math means a 6% contribution costs about 5% of take-home and the match doubles it. Refusing overtime or a raise “to stay out of the next bracket,” which is mathematically impossible to lose from. Leaving the W-4 untouched after a marriage, a child, or a second job. Confusing the insurance premium deduction (pre-tax, cheap) with post-tax deductions. And treating a big refund as a win instead of twelve months of interest-free lending.

Overtime, bonuses, and extra pay: same system, different withholding

Extra income confuses people because withholding treats it differently than the tax code does. Overtime is taxed exactly like regular wages at your marginal rate; it only looks over-taxed because a fatter check gets withheld as if you earned that much every period, and the excess comes back at filing. The mechanics are in how overtime pay works. Bonuses usually run through the flat 22% federal supplemental system instead of your W-4, which is withholding convenience, not a special bonus tax. And a raise never lowers take-home: only the new dollars enter the higher bracket, which is worth internalizing before you ever hesitate over what a raise is worth.

Reading your pay stub like an auditor

Every stub has two columns that matter: this period and year-to-date. The codes vary by payroll company but decode the same way: FED or FITW is federal income tax, OASDI or SS is Social Security, MED is Medicare, ST plus a state code is state tax, and the remaining lines are your elections (401k, medical, dental, HSA) or oddities like imputed income for group life insurance over $50,000. Two sanity checks take thirty seconds: Social Security year-to-date should be exactly 6.2% of FICA-eligible gross until the wage base, and federal withholding divided by gross should sit near the effective rate this guide computed for your bracket. When either drifts, something changed: a benefits election, a W-4 entry, or a payroll mistake, and payroll mistakes get fixed much faster inside the same tax year.

A year of paychecks: the January-to-December rhythm

Paychecks have a calendar. January brings the inflation resets: new standard deduction, new bracket thresholds, new wage base, and usually new benefit prices, so the first check of the year moves a little even without a raise. Biweekly employees hit two months with three paychecks, and since most budgets are built on two, the third check is the easiest found money of the year. High earners cross the Social Security wage base sometime in fall and watch take-home jump 6.2% for the remaining checks. December closes the window on 401(k) and FSA contributions for the year: money you meant to shelter but never elected is simply taxed. One planning pass each January, ten minutes with the calculator below, catches all of it.

Self-employed? Same math, both hats

Freelancers and contractors run this exact pipeline with two changes. First, FICA doubles into self-employment tax, 15.3%, because you pay both the employee and employer halves, though half of it becomes a deduction against income tax. Second, nobody withholds for you: the quarterly estimated payment schedule replaces the paycheck’s automatic skim, and missing it trades convenience for penalties. The bracket math, standard deduction, and state rules are otherwise identical to everything above.

Job changes mid-year: the wage base quirk

Switch employers in one calendar year and each payroll system starts your Social Security meter at zero, because neither can see the other’s withholding. Earn past the $184,500 wage base across the two jobs combined and you will overpay Social Security during the year; the excess comes back as a credit when you file, automatically, but only if you file for it. Federal income tax withholding also restarts on a fresh W-4 at the new job, which is the natural moment to fix any settings the old job got wrong, and to remember that year-to-date bracket math carries over even though the paperwork does not.

Frequently asked questions

Why did my paycheck change in January without a raise?

The standard deduction, bracket thresholds, and the Social Security wage base all reset for inflation each year, and benefit elections often renew at new prices. Small January moves in either direction are normal.

Why was my first paycheck at a new job smaller than expected?

Partial pay periods and benefit deductions that start immediately are the usual culprits, and some employers hold one period “in arrears.” Check the pay period dates on the stub before assuming the withholding is wrong.

Do I ever get FICA money back?

Not on your return in the normal case; it funds your future Social Security and Medicare benefits. One exception: if two employers together withhold Social Security past the wage base, the excess comes back at filing.

I have two jobs. Why do I owe every April?

Each employer withholds as if theirs is your only income, so both start you in the 10% bracket. The W-4 has a two-jobs checkbox precisely to fix this; check it at both employers or add extra withholding at one.

How many dependents should I claim?

The modern W-4 asks for dollars, not allowances: $2,000 per qualifying child under 17. Claiming them lowers withholding now; skipping them raises your refund later. Same total tax either way.

From here, go by state or by situation: the paycheck calculators cover take-home by state, overtime, raises, and bonuses, and the salary to hourly converter translates any offer into real per-hour terms.