Gross Pay vs Net Pay: Where the Rest of Your Paycheck Goes
Opening a first paycheck and finding a number hundreds of dollars smaller than the salary that was agreed on feels like something got shortchanged. Nothing did. A salary offer states one number, and a bank account sees a smaller one every payday, but the gap isn't arbitrary: it's a fixed stack of deductions applied in a specific order.
Taxes come off first, but not all at once
In the US, federal income tax is withheld based on progressive brackets. Higher portions of income are taxed at higher rates, so the withholding isn't a single flat percentage of the whole paycheck. Many states and some cities layer their own income tax on top, withheld separately, which is exactly why identical gross salaries produce different take-home pay depending on where someone lives and works.
Payroll tax is a separate, parallel deduction
Alongside income tax, US paychecks carry FICA withholding: Social Security (6.2%) and Medicare (1.45%). Social Security tax only applies up to an annually-adjusted wage cap. Once a high earner's year-to-date pay crosses that threshold, Social Security withholding stops for the rest of the year, which is why some people notice a jump in take-home pay later in the year with no raise involved. Medicare withholding, by contrast, has no cap and even adds an extra 0.9% surtax above a separate higher income threshold.
If the deductions on a pay stub look like a wall of unfamiliar line items rather than a clean two-number split, that's normal, not a sign of a mistake or someone skimming extra off the top. Each line traces back to one of a small handful of categories: federal tax, state or local tax, FICA, and whatever's elected pre-tax, and checking a stub against those categories is usually enough to account for the whole gap.
Pre-tax deductions shrink the number taxes are even calculated on
Contributions to a 401(k) retirement account and many employer health insurance premiums are typically deducted before income tax is calculated, not after. They reduce the taxable income itself, not just the final take-home number. That's a meaningfully different mechanism than a straightforward post-tax deduction, and it's why increasing a 401(k) contribution doesn't reduce take-home pay by the full contribution amount.
What to actually do with the gap
None of the tax withheld through the year is the actual final amount owed. It's an estimate reconciled at annual filing. That reconciliation is exactly why some people get a refund (they had too much withheld) and others owe extra (too little was withheld), even though their paychecks looked identical to a coworker's all year. If the goal is not getting an unpleasant surprise at tax time, check your W-4 or state withholding form whenever income changes meaningfully: a raise, a second job, freelance income, since withholding is calculated off information that can go stale. If the goal is increasing take-home pay right now without changing gross salary, pre-tax contributions are the lever, since they lower the income taxes are calculated on, not just the final number. And if the goal is simply understanding why this month's stub differs from last month's, the FICA wage cap and any change in pre-tax elections are the two most common explanations for a shift that isn't a raise or a mistake.
Convert between pay periods and estimate your own take-home pay with the salary calculator.