Seeing your first paycheck after accepting a job offer with a specific salary is often a small shock — the number that actually lands in your bank account is noticeably lower than salary divided by pay periods. Understanding exactly where that gap goes makes budgeting far more accurate.
Three main deductions separate gross salary from take-home pay: federal income tax (calculated using progressive tax brackets), FICA (a flat 7.65% covering Social Security and Medicare), and any pre-tax deductions you've elected, like 401(k) contributions or health insurance premiums. Each of these reduces what actually reaches your account, and they stack together in a specific order.
How Take-Home Pay Is Calculated
Pre-tax deductions come out first, reducing your taxable income before federal tax brackets are applied. Federal tax is then calculated on the remaining taxable income using progressive brackets. FICA, notably, is calculated on your gross wages directly — not your reduced taxable income — since it isn't affected by pre-tax deduction elections the same way income tax is.
Take-Home Pay = Gross Pay − Federal Tax − FICA − Pre-Tax Deductions
A Worked Example
On a $70,000 annual salary with $3,000 in annual pre-tax deductions (401k and health insurance combined), paid semi-monthly (24 pay periods): taxable income after deductions is $67,000, producing roughly $7,900 in estimated federal tax. FICA on the full $70,000 gross comes to about $5,355. Combined with the $3,000 in deductions, take-home pay works out to about $53,745 annually — roughly $2,239 per paycheck, compared to a gross paycheck of $2,917 before any deductions.
Common Mistakes to Avoid
- Forgetting state income tax: this example covers federal tax and FICA only — most states add their own income tax on top, further reducing take-home pay.
- Not accounting for pre-tax deductions properly: 401(k) and health insurance premiums lower your taxable income, which is a real tax benefit worth understanding, not just a reduction in your paycheck.
- Assuming a raise translates fully to take-home pay: a raise that pushes you into a higher marginal bracket means only the portion above that threshold is taxed at the higher rate — but total withholding still increases meaningfully.
- Budgeting off gross salary instead of net pay: this is the single most common paycheck planning mistake — always budget against what actually lands in your account.
Bottom Line
The gap between salary and take-home pay is entirely explained by tax and deductions, not a mystery. Use a Take-Home Paycheck Calculator to estimate your real net pay per paycheck based on your salary, pay frequency, and pre-tax deductions.