Why Your Paycheck Is Smaller Than Your Salary

An offer letter quotes one number a year. A paycheck arrives twenty-six times a year with a different one, and nobody explains the arithmetic in between. Most people learn it by subtraction: the deposit is smaller than expected, and the stub that would explain why is a column of abbreviations.

The gap is not mysterious once you see the order the subtractions happen in. Two of them are taxes with published rates, one is a formula your employer runs on every check, and one is money you chose to spend before it reached you. This walks through all four on a single paycheck.

The gap between a salary and a deposit

A salary is an annual rate, not a payment. What turns it into a payment is your employer’s pay frequency, and that varies more than you might think. In February 2023, the Bureau of Labor Statistics found that 43.0% of private establishments paid biweekly, 27.0% weekly, 19.8% semimonthly and 10.3% monthly.^[9] The choice matters for budgeting, because biweekly pay means 26 checks rather than 24, so two months each year contain three of them.

Four things stand between gross pay for the period and the money that lands:

• Pre-tax deductions. Health, dental and vision premiums, HSA and FSA contributions, and 401(k) or 403(b) deferrals. These come out first and change what the taxes are calculated on.
• Federal income tax withholding. An estimate of the annual tax you will owe, spread across your checks.
• FICA. Social Security and Medicare, at flat rates.
• State and local income tax, in most places, plus post-tax items such as a Roth 401(k), union dues, garnishments and life insurance above the excludable amount.

It is worth noting that your salary is not what you cost your employer either. In June 2026, total compensation for private industry workers averaged $46.89 an hour worked, of which wages and salaries were $32.82, or 70.0%, and benefits were $14.07, or 30.0%.^[10] Your gross pay sits in the middle of two larger numbers: what you cost above it, and what you keep below it. Budgeting rules use the bottom one, which is why the 50/30/20 rule splits after-tax pay rather than salary.

Federal income tax: the formula

Withholding is the line people assume is a bracket lookup. It is not. Your employer runs a worksheet from IRS Publication 15-T on every check, and the mechanics explain several things that otherwise look like payroll errors.

For a single filer in 2026, the standard withholding table starts at 0% on the first $7,500 of adjusted annual wages, charges 10% from there to $19,900, then $1,240 plus 12% up to $57,900, then $5,800 plus 22% up to $113,200.^[2] The $8,600 subtraction and the 0% band together stand in for the standard deduction, which the IRS set at $16,100 for single filers in 2026, $32,200 for married couples filing jointly and $24,150 for heads of household.^[4]

Three consequences follow from a formula built this way. First, every check is withheld as though the whole year were made of checks exactly like it, so an unusual period (a chunk of overtime, a retroactive raise paid with regular wages) is annualized into an income you do not have and over-withheld accordingly. Second, if you check the box in Step 2 because you hold two jobs, the standard amount drops to zero and a steeper rate schedule applies, which Publication 15-T states plainly results in higher withholding.^[2] Third, the published brackets apply to taxable income, not to salary, so the bracket you quote at a party is never the share of your pay that leaves.

FICA, and the wage base

FICA is the simple half. Employees pay 6.2% for Social Security and 1.45% for Medicare, and the employer matches both. There are no brackets, no standard deduction and no filing status: the rate on the first dollar is the rate on the last one.

Two ceilings apply, in opposite directions. Social Security tax stops once your wages for the year pass the wage base, which is $184,500 for 2026. Medicare has no ceiling, and an Additional Medicare Tax of 0.9% is withheld on wages above $200,000 in a calendar year, regardless of filing status, with no employer match.^[1]

Because the rate is flat and the ceiling is high, FICA is the most predictable line on the stub and often the largest one for people earning below the median. It is also the line that explains why working for yourself feels so expensive: an employee sees 7.65%, while the self-employed owe both halves on net earnings, which is part of why paying yourself a salary out of a holding account means setting tax money aside before you spend anything.

Pre-tax deductions and the taxes they dodge

Here the stub stops being about tax policy and starts being about your own choices. A deduction taken before tax reduces the wages the tax is calculated on, but not every pre-tax deduction dodges every tax, and the difference is worth real money.

So a dollar into your 401(k) saves income tax now and nothing on FICA: Social Security and Medicare are withheld on money you never see in the deposit. The 2026 elective deferral limit is $24,500, with an extra $8,000 allowed from age 50 and $11,250 from 60 through 63.^[5] A health premium is the stronger shield, and the amounts are not small: KFF’s 2025 survey put the average worker contribution at $1,440 a year for single coverage and $6,850 for family coverage, about 16% and 26% of the full premium.^[11]

The order of these deductions is also why two colleagues on identical salaries take home different amounts. One defers 10% and covers a family; the other defers nothing and covers only themselves. Neither stub is wrong. Which of those dollars to send where is the question the funding order answers, match first.

A $65,000 salary, line by line

Median usual weekly earnings for full-time wage and salary workers were $1,251 in the second quarter of 2026, up 4.6% from a year earlier.^[8] That is about $65,000 a year, so take that as the example: a single filer, paid biweekly, standard Form W-4 with no dependents and nothing in Steps 3 or 4, deferring 5% to a traditional 401(k), paying KFF’s average single-coverage premium of $1,440 a year through a cafeteria plan, in a state with no income tax.

Gross per check is $65,000 ÷ 26 = $2,500.00. The health premium of $55.38 comes out first and is excluded from wages for both purposes, leaving $2,444.62 as FICA wages. The 401(k) deferral of $125.00 comes out for income tax only, leaving $2,319.62 as taxable wages for withholding. Annualized that is $60,310.12; minus the $8,600 standard amount it is $51,710.12, which lands in the 12% row: $1,240 plus 12% of $31,810.12 is $5,057.21 a year, or $194.51 per check.^[2]

Read the middle term closely, because it is the part most summaries get wrong. Of the $561.91 that did not arrive, $381.53 is tax (15.3% of gross), $125.00 is retirement savings in an account with your name on it, and $55.38 bought health coverage. Three different kinds of money, one number on the stub.

Notice the two rates that are both true at once. This filer sits in the 12% bracket, and their federal income tax of roughly $5,057 is 7.8% of salary. Marginal and effective rates answer different questions: the first prices the next dollar you earn, the second measures the year you had.

Why your checks change during the year

Pay is annual, withholding is per period, and the two reconcile only in April. That mismatch is behind nearly every mid-year surprise.

1. 1
   You pass the Social Security wage base

   Above $184,500 of 2026 wages, the 6.2% stops and your checks grow by that much for the rest of the year. Medicare keeps going, and the extra 0.9% starts above $200,000.
2. 2
   You hit the 401(k) limit

   Once deferrals reach $24,500 ($32,500 or $35,750 with catch-up), payroll stops taking them. Net pay rises, and the income tax withheld on those checks rises with it.
3. 3
   A bonus is paid

   Employers may withhold on supplemental wages at a flat 22%, and must use 37% above $1 million for the year. Withholding at 22% against a 12% marginal rate hands the difference back at filing time.
4. 4
   January resets everything

   New premiums, new deferral elections, a new wage base, and new tables. The first check of the year is the one to read line by line.

The bonus rule is the one people most often read as a penalty. The 22% flat rate on supplemental wages, and 37% once they exceed $1 million, are withholding rates set in Publication 15.^[3] They decide when you get the money, not how much tax you owe.

A big refund is not a windfall

By May 8, 2026, the IRS had issued 99,138,000 refunds averaging $3,276, against 144,992,000 returns received, for a total of $324.757 billion returned.^[7] Some of that is refundable credits paid out rather than withholding handed back, so the average does not translate directly into over-withholding. But the direction is unmistakable: most filers finish the year having sent more than they owed.

A $3,276 refund is $126 a check you could have had in February. The reverse error costs more, because under-withholding can bring a penalty as well as a bill, which is the argument for checking the W-4 in the middle of the year rather than discovering the answer at filing time. Either way, the number to steer by is what you keep, and a savings rate measured on take-home pay is the one that tells you whether the deposit is doing its job.

Reading your own stub

Everything above can be checked against the piece of paper you already have. Five minutes with one stub answers most questions about the rest.

1. 1
   Find gross for the period and year to date

   Year to date is the figure that tells you whether you are on pace for the wage base, the deferral limit or an annual salary you thought you were earning.
2. 2
   Separate pre-tax from post-tax deductions

   They are usually in different blocks, sometimes labeled only by a code. A Roth deferral sits below the tax lines; a traditional one sits above them.
3. 3
   Check FICA against the arithmetic

   Social Security should be 6.2% and Medicare 1.45% of wages after cafeteria-plan exclusions. If the ratio is off, something is excluded, capped or miscoded.
4. 4
   Check the filing status payroll used

   The W-4 your employer holds may be years old. A marriage, a second job or a new child changes what belongs in Steps 2 and 3.
5. 5
   Recompute, then adjust once

   The IRS Tax Withholding Estimator uses the same tables as your employer. One corrected W-4 fixes every check that follows.

The harder problem is that none of this appears in your bank feed. A deposit of $1,938.09 is a single transaction; the $561.91 that never arrived is invisible to any app that reads only your accounts. That is the gap LumaLedger’s Pay page closes: upload a stub as a photo or a PDF, and it reads the lines, shows gross at the top, every band that came out of it (tax, retirement, health, other) and take-home at the bottom, for one year at a time. Nothing posts to the ledger, and the totals count only the stubs you have uploaded, checked against your employer’s own year-to-date figure rather than estimating the gap away.

Once a year of stubs is in one place, the question changes from what was withheld to what the withholding left you with, which is the number every plan is actually built on.