Understanding Your Paycheck: Where Does Your Money Go?

The first full-time paycheck often comes with a shock: the number deposited in your bank account is noticeably smaller than the salary you were promised. That gap between gross pay and net pay is not a mistake — it is the combined effect of taxes, benefits and deductions. Once you understand each line of your pay stub, you can plan more accurately, spot errors and make smarter choices about withholding and benefits.

Gross pay vs. net pay

Gross pay is what you earn before anything is withheld: your hourly wage times hours, or your annual salary divided by the number of pay periods. Net pay, often called take-home pay, is what is left after taxes and deductions. For a typical full-time employee, net pay is roughly 70% to 80% of gross, though it varies with income, state, benefits and retirement contributions.

Federal income tax withholding

Your employer withholds federal income tax based on the information you provide on Form W-4: your filing status, number of jobs, dependents and any additional adjustments. The withholding is an estimate of the tax you will owe for the year. If too much is withheld you receive a refund; if too little is withheld, you may owe money in April. A refund is not free money — it is your own money returned after an interest-free loan to the government.

FICA: Social Security and Medicare

FICA taxes fund Social Security and Medicare. As an employee you pay 6.2% of wages for Social Security, up to an annual wage base ($184,500 in 2026), and 1.45% for Medicare on all wages. Higher earners pay an additional 0.9% Medicare tax on wages above $200,000 for single filers. Your employer pays a matching share, so the total contribution is double what you see. These taxes do not depend on your W-4 or the standard deduction, and pre-tax 401(k) contributions do not reduce them.

State and local taxes

Most states tax wages, but Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington and Wyoming do not. Some states and cities add their own taxes, and a few states charge payroll contributions for disability insurance or paid family leave. Moving across a state line can change your take-home pay noticeably even if your salary stays the same. To compare states, enter the same salary into the paycheck calculator and switch the state dropdown.

Pre-tax vs. post-tax deductions

Deductions fall into two groups. Pre-tax deductions are subtracted before income tax is calculated, so they lower your taxable income. Examples include traditional 401(k) contributions, health insurance premiums paid through an employer plan, health savings account (HSA) contributions and flexible spending accounts. Post-tax deductions come out after taxes are computed, such as Roth 401(k) contributions, union dues, wage garnishments and some insurance premiums.

Because pre-tax deductions reduce taxable income, a $100 contribution to a traditional 401(k) might reduce your take-home pay by only $75–$80 if you are in the 20–25% combined tax range. Our retirement savings calculator shows how those contributions grow over time.

A sample paycheck

Consider a single employee in Texas earning $78,000 a year, paid biweekly, with no 401(k). Gross pay per check is $3,000. Annual FICA is about $5,967 ($230 per check). After the $16,100 standard deduction, taxable income is $61,900 and annual federal income tax is about $8,330 — roughly $320 per check. Take-home pay is therefore about $2,450 per paycheck, or around 82% of gross. In a state with a 5% income tax, state withholding would remove roughly another $150 per check.

How to read your pay stub

• Year-to-date (YTD) totals: cumulative amounts, useful for tracking progress toward the Social Security wage base and for your tax return.
• Hours and rate: check overtime and differentials for accuracy.
• Taxes section: federal, state, local, Social Security and Medicare, each listed separately.
• Deductions section: benefits and retirement, labeled pre-tax or post-tax.
• Net pay: the amount deposited.

Adjusting your withholding

Life changes — marriage, a new child, a second job, a big raise — can make your withholding inaccurate. The IRS offers a free Tax Withholding Estimator that helps you decide how to fill out a new W-4. Giving your employer an updated W-4 takes effect within a pay period or two. If you prefer a larger paycheck now, you can reduce withholding, but make sure you are not heading toward an unexpected bill and an underpayment penalty.

Common pay stub errors

Mistakes are uncommon but not unheard of. Check that your name, Social Security number and filing status are correct, that benefits you declined are not being deducted, and that overtime is paid at the right rate. Flag anything unusual to your payroll or HR department promptly; corrections are easier the sooner you catch them.

Takeaway

Your paycheck is the result of a series of formulas, and each one is something you can understand and, in many cases, influence. Review your pay stub every few months, update your W-4 when your life changes, and use a calculator to model raises, new jobs and retirement contributions before they hit your bank account.