Understanding Your Paycheck: A Complete Guide

If you've ever looked at your paycheck and wondered why the amount deposited is so much less than your salary suggests, you're not alone. This guide breaks down every line on your pay stub so you know exactly where your money goes.

Gross Pay vs. Net Pay

Gross pay is the total amount you earn before any deductions. If you're salaried, it's your annual salary divided by the number of pay periods. If you're hourly, it's your hourly rate multiplied by the hours you worked, including any overtime.

Net pay (also called take-home pay) is what you actually receive after all taxes and deductions are subtracted. The difference between gross and net can be significant — most workers take home between 60% and 80% of their gross pay.

Federal Income Tax Withholding

Federal income tax is typically the largest deduction on your paycheck. The amount withheld depends on several factors:

• Your filing status (single, married filing jointly, head of household)
• The number of allowances or adjustments on your W-4 form
• Your income level and the corresponding tax bracket
• Any additional withholding you've requested

The U.S. uses a progressive tax system, meaning higher portions of your income are taxed at higher rates. Your employer uses IRS withholding tables to estimate how much to take out each pay period.

FICA Taxes: Social Security & Medicare

FICA stands for the Federal Insurance Contributions Act. These taxes fund Social Security and Medicare:

• Social Security: 6.2% of your gross wages, up to the wage base limit of $176,100 in 2025. Your employer matches this amount.
• Medicare: 1.45% of all gross wages with no cap. An additional 0.9% Medicare surtax applies to wages above $200,000 for single filers.

Combined, FICA takes 7.65% of your paycheck (up to the Social Security wage cap). These are mandatory and cannot be adjusted on your W-4.

State Income Tax

Most states impose their own income tax on top of federal taxes. Rates and structures vary widely — some states use flat rates while others have progressive brackets. Nine states have no income tax at all: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming.

Some cities and counties also levy local income taxes. For example, residents of New York City pay city income tax in addition to New York state tax.

Pre-Tax Deductions

Pre-tax deductions are subtracted from your gross pay before taxes are calculated, which lowers your taxable income and reduces the amount of tax you owe. Common pre-tax deductions include:

• Traditional 401(k) contributions: Retirement savings that reduce your current taxable income.
• Health insurance premiums: Employer-sponsored health, dental, and vision plans are typically deducted pre-tax.
• Health Savings Account (HSA): Contributions to an HSA are pre-tax if you have a high-deductible health plan.
• Flexible Spending Account (FSA): Pre-tax dollars set aside for healthcare or dependent care expenses.
• Commuter benefits: Pre-tax transit and parking benefits, if offered by your employer.

Post-Tax Deductions

Post-tax deductions are taken after taxes are calculated. These don't reduce your taxable income but still come out of your paycheck:

• Roth 401(k) contributions: Retirement savings made with after-tax dollars that grow tax-free.
• Disability and life insurance: Some employer-sponsored plans are deducted post-tax.
• Wage garnishments: Court-ordered deductions for child support, student loans, or other debts.
• Union dues: If applicable, typically deducted after taxes.

How to Read Your Pay Stub

A standard pay stub includes these sections:

• Earnings: Your gross pay broken down by regular hours, overtime, bonuses, and other compensation.
• Taxes: Federal, state, and local income taxes plus FICA (Social Security and Medicare).
• Deductions: Pre-tax and post-tax deductions for benefits, retirement, and other items.
• Net pay: The final amount deposited into your bank account.
• Year-to-date totals: Running totals of all earnings, taxes, and deductions for the calendar year.

Review your pay stub each pay period to make sure your withholdings and deductions are correct. Mistakes can lead to an unexpected tax bill or an unnecessarily large refund.