Every employee has had the same moment: you look at your first paycheck and wonder where the money went. The answer is payroll deductions, the amounts taken out of your gross pay before you receive your net pay. Whether you’re an employee or a small business owner running payroll, understanding them saves a lot of confusion
Mandatory Deductions
These are required by law, and you can’t opt out.
Federal income tax. The amount withheld depends on your earnings, filing status, and the information on your Form W-4. Fill it out carefully, since it determines how much is taken from each paycheck.
FICA taxes. These fund Social Security and Medicare. Employees pay 6.2% for Social Security and 1.45% for Medicare, a combined 7.65%. Employers match this amount. Higher earners may also owe an Additional Medicare Tax of 0.9% once wages pass a certain threshold.
State and local taxes. Most states withhold income tax, and some cities or counties add their own. A few states have no income tax at all, so this varies widely by location.
Court-ordered deductions. Wage garnishments for child support, unpaid taxes, or defaulted loans are taken directly from pay when a legal order requires it
Voluntary Deductions
- Health, dental, and vision insurance premiums
- Retirement contributions, such as a 401(k) or 403(b)
- Health Savings Accounts (HSA) and Flexible Spending Accounts (FSA)
- Life or disability insurance
- Union dues, commuter benefits, and charitable giving
Pre-Tax vs. Post-Tax
This distinction matters. Pre-tax deductions, like traditional 401(k) contributions and many health premiums, come out before income tax is calculated, which lowers your taxable income. Post-tax deductions, like Roth 401(k) contributions and garnishments, come out after taxes, so they don’t reduce your taxable wages.
Tips for Employers
Errors in deductions can lead to penalties and unhappy employees. Calculate withholdings accurately, remit taxes on time, and keep good records. Many small businesses use payroll software to automate calculations, file taxes, and keep up with changing rules, which cuts down on costly mistakes.
The Bottom Line
Payroll deductions can feel like a mystery, but each one has a purpose, from funding public programs to building your own benefits. Knowing what comes out of your paycheck, and why, helps you plan your finances and spot problems early.