Understanding Your Paycheck Deductions

Your paycheck stub contains a wealth of information, but for many workers, it’s a confusing list of abbreviations and numbers. Understanding each deduction helps you verify your employer is withholding the correct amounts, plan your finances more accurately, and identify opportunities to optimize your take-home pay.

Let’s walk through every section of a typical paycheck stub and explain what each deduction means.

Gross Pay vs. Net Pay

At the top of your pay stub, you’ll see two key figures:

• Gross pay: Your total earnings before any deductions. For salaried employees, this is your annual salary divided by the number of pay periods. For hourly workers, it’s hours worked multiplied by your hourly rate, plus any overtime.
• Net pay (take-home pay): What actually hits your bank account after all deductions.

The difference between these two numbers can be substantial. On a $75,000 salary, you might take home only $55,000 to $60,000 depending on your state, filing status, and benefits elections.

Federal Income Tax Withholding

This is typically the largest deduction on your paycheck. Your employer calculates this based on:

• Your filing status (single, married filing jointly, head of household)
• The number of allowances or adjustments on your W-4 form
• Your pay frequency (weekly, biweekly, semi-monthly, monthly)
• The IRS withholding tables for the current tax year

The amount withheld is an estimate of your annual tax liability based on federal tax brackets, spread across your pay periods. When you file your tax return, you reconcile what was withheld against what you actually owe — resulting in either a refund or a balance due.

Common Reasons for Incorrect Withholding

• Outdated W-4: Life changes like marriage, divorce, or having a child affect your tax situation. Update your W-4 when these events occur.
• Multiple jobs: If you or your spouse work multiple jobs, each employer only knows about the income they pay you. Without adjustments, you may have too little withheld.
• Side income: Freelance or gig income isn’t subject to withholding. You may need to increase your W-4 withholding or make quarterly estimated payments.

State Income Tax Withholding

If you live in a state with an income tax, you’ll see a separate state tax withholding. State income tax rates and structures vary widely:

• Flat-rate states (like Illinois at 4.95% or Colorado at 4.4%) tax all income at the same rate
• Progressive states (like California or New York) have multiple brackets similar to the federal system
• No-income-tax states (Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, Wyoming) have no state withholding at all

Some cities also levy local income taxes. New York City, for example, adds 3.078% to 3.876% on top of New York State’s income tax.

FICA Taxes: Social Security and Medicare

FICA stands for the Federal Insurance Contributions Act. These are mandatory payroll taxes that fund Social Security and Medicare. For a deeper dive, see our guide on what FICA tax is and how each component is calculated.

Social Security Tax

• Rate: 6.2% of gross pay (your employer pays an additional 6.2%)
• Wage base: $176,100 in 2025 — earnings above this amount are not subject to Social Security tax
• What it funds: Retirement benefits, disability insurance, and survivor benefits

If you earn over the wage base, you’ll notice your Social Security withholding stops partway through the year. This gives you a slightly higher take-home pay for the remaining pay periods.

Medicare Tax

• Rate: 1.45% of all gross pay (no wage base limit)
• Additional Medicare Tax: 0.9% on earnings over $200,000 for single filers ($250,000 for married filing jointly)
• What it funds: Health insurance for people 65 and older and certain disabled individuals

Combined, FICA taxes total 7.65% of your pay (up to the Social Security wage base). This is a significant chunk — on a $75,000 salary, that’s $5,737.50 per year.

Pre-Tax Deductions

Pre-tax deductions reduce your taxable income, which means you pay less in taxes. These deductions come out of your gross pay before taxes are calculated.

401(k) or 403(b) Contributions

If you contribute to an employer-sponsored retirement plan, those contributions are typically pre-tax. Contributing 6% of a $75,000 salary means $4,500 goes into your retirement account, and your taxable income drops to $70,500. At a 22% marginal tax rate, that saves you $990 in federal taxes.

Many employers match a portion of your contributions — this is essentially free money. If your employer matches 50% up to 6%, and you contribute 6%, they add another 3% of your salary.

Health Insurance Premiums

Employer-sponsored health insurance premiums are almost always pre-tax. The average employee contribution for a single plan is around $1,400 per year, and for a family plan, around $6,500 per year. These amounts reduce your taxable income.

Health Savings Account (HSA)

If you have a high-deductible health plan, you may contribute to an HSA. Contributions are pre-tax (up to $4,300 for individuals or $8,550 for families in 2025), withdrawals for qualified medical expenses are tax-free, and the account grows tax-free. It’s one of the most tax-advantaged accounts available.

Flexible Spending Account (FSA)

FSAs let you set aside pre-tax money for healthcare or dependent care expenses. The 2025 limit is $3,300 for healthcare FSAs. Unlike HSAs, FSA funds generally must be used within the plan year (though some plans offer a grace period or carryover).

Post-Tax Deductions

Some deductions come out after taxes are calculated. They don’t reduce your taxable income.

Roth 401(k) Contributions

If you opt for Roth contributions to your 401(k), the money is deducted after taxes. You pay taxes now, but qualified withdrawals in retirement are tax-free.

Life Insurance Premiums

Employer-provided group term life insurance coverage over $50,000 is considered taxable income. You may see a small “imputed income” addition and a corresponding post-tax deduction.

Wage Garnishments

Court-ordered wage garnishments for child support, unpaid debts, or tax liens are post-tax deductions. These are not voluntary and are mandated by law.

Reading Your Pay Stub: A Practical Example

Let’s break down a sample biweekly pay stub for someone earning $75,000 per year, single filer, living in a state with 5% income tax, contributing 6% to a 401(k):

Gross Pay: $2,884.62

Pre-Tax Deductions:

• 401(k) contribution (6%): -$173.08
• Health insurance premium: -$65.00
• Taxable gross: $2,646.54

Tax Withholdings:

• Federal income tax: -$310.00
• State income tax: -$132.33
• Social Security (6.2%): -$178.85
• Medicare (1.45%): -$41.83

Net Pay: $1,983.53

Out of the $2,884.62 gross, roughly $900 goes to taxes and deductions. Over a year, that’s about $23,400 in total deductions on a $75,000 salary.

How to Optimize Your Take-Home Pay

Adjust Your W-4

If you consistently get large refunds, you’re giving the government an interest-free loan. Our guide on how to fill out your W-4 walks through every step. Consider reducing your withholding so you get more in each paycheck. Conversely, if you owe a large balance every April, increase your withholding to avoid penalties.

Maximize Pre-Tax Contributions

Every dollar you contribute to a pre-tax 401(k) or HSA reduces your taxable income. If you’re in the 22% bracket, a $100 pre-tax contribution only costs you $78 in take-home pay.

Review Your Benefits Elections

During open enrollment, compare health plan options carefully. A higher-deductible plan with lower premiums paired with an HSA can sometimes result in lower total costs than a premium plan — while giving you a tax-advantaged savings account.

Calculate Your Exact Take-Home Pay

Every paycheck situation is different. Your state, city, filing status, deductions, and benefits all affect the final number. Use our Paycheck Calculator to enter your specific details and see an accurate breakdown of your gross-to-net pay.

Key Takeaways

• Gross pay is your total earnings; net pay is what you take home
• Federal and state income taxes are the largest deductions for most workers
• FICA taxes (Social Security + Medicare) total 7.65% of your pay
• Pre-tax deductions (401k, health insurance, HSA) reduce your taxable income
• Post-tax deductions (Roth 401k, garnishments) do not reduce taxes
• Review your W-4 annually and after major life events
• Use pre-tax accounts strategically to lower your tax burden