Quick answer
Pay stub deductions are amounts subtracted from an employee’s gross earnings before final net pay is calculated. Common deductions include federal income tax, Social Security, Medicare, state or local taxes, insurance premiums, retirement contributions, benefits, and legally required withholding.
Gross Pay − Taxes − Other Deductions = Net Pay
Every paycheck comes with a pay stub listing a series of line items most people skim past without fully understanding. Those lines — taxes, FICA, insurance, retirement — determine why the number you take home is smaller than the number you earned. This guide breaks down every common pay stub deduction in plain language, so the next time you look at your paycheck, you know exactly what each line means and why it’s there.
What Are Pay Stub Deductions?
A pay stub deduction is any amount withheld from an employee’s gross earnings before they receive their pay. Deductions fall into two broad groups: taxes required by law, and other withholdings either required by a legal order or elected voluntarily by the employee, such as insurance premiums or retirement savings. Together, these deductions explain the gap between gross pay (total earnings) and net pay (the amount actually deposited or paid out).
What Deductions Appear on a Pay Stub?
A typical pay stub itemizes deductions such as:
- Federal income tax withholding
- Social Security tax
- Medicare tax
- State income tax (in states that levy one)
- Local or city income tax (in some jurisdictions)
- Health, dental, or vision insurance premiums
- Retirement plan contributions (401(k), 403(b), or similar)
- Health Savings Account (HSA) or Flexible Spending Account (FSA) contributions
- Wage garnishments, when legally ordered
- Other voluntary benefits, such as life insurance or union dues
Mandatory vs. Voluntary Paycheck Deductions
Paycheck deductions split into two categories. Mandatory deductions are required by law and an employer has no discretion over them — federal income tax, Social Security, Medicare, applicable state and local taxes, and court-ordered wage garnishments all fall here. Voluntary deductions are elected by the employee, such as health insurance enrollment, retirement contributions, or supplemental life insurance. Voluntary deductions require the employee’s authorization, typically during benefits enrollment.
Federal Income Tax Withholding
Federal income tax withholding (often labeled FED or FIT) is the amount an employer withholds from each paycheck and sends to the IRS on the employee’s behalf, based on the income reported on Form W-4. It acts as a prepayment toward the employee’s total annual federal tax liability, reconciled when the employee files their tax return.
What Is FICA on a Pay Stub?
FICA stands for the Federal Insurance Contributions Act. It is the umbrella payroll tax that funds Social Security and Medicare, and it may appear as a single “FICA” line or be split into separate Social Security and Medicare lines. Employees and employers each pay a matching share of FICA taxes.
Social Security Tax
Social Security tax, sometimes labeled SS or OASDI (Old-Age, Survivors, and Disability Insurance), funds retirement, disability, and survivor benefits. As of recent tax years, the employee share is 6.2% of wages up to an annual wage base limit set by the Social Security Administration. Earnings above that limit in a given year are not subject to additional Social Security tax.
Medicare Tax
Medicare tax, labeled MED on many pay stubs, funds the Medicare health insurance program. The standard employee rate is 1.45% of all wages, with no annual wage base limit. Employees with wages above a certain threshold may also owe an Additional Medicare Tax of 0.9%, which their employer withholds once earnings cross that level.
State Income Tax Deductions
Many, but not all, states levy their own income tax, withheld similarly to federal income tax and labeled SIT (State Income Tax) or with the state’s abbreviation. A handful of states have no state income tax at all, in which case this line will not appear on a pay stub for employees working in those states.
Local Payroll and Income Taxes
Some cities, counties, or school districts levy their own local income or payroll taxes on top of federal and state withholding. These appear as a separate line item, usually named after the specific jurisdiction, and only apply to employees who live or work in areas that impose them.
What Are Pre-Tax Deductions?
A pre-tax deduction is subtracted from gross pay before taxes are calculated, which lowers the amount of income subject to tax. Common pre-tax deductions include traditional 401(k) contributions, HSA and many FSA contributions, and employer-sponsored health insurance premiums offered through a qualifying plan.
What Are Post-Tax Deductions?
A post-tax deduction is subtracted after taxes have already been calculated and withheld, so it does not reduce taxable income. Roth 401(k) contributions, certain disability or life insurance premiums, and wage garnishments are typically taken post-tax.
Pre-Tax vs. Post-Tax Deductions
| Aspect | Pre-Tax Deduction | Post-Tax Deduction |
|---|---|---|
| When it’s subtracted | Before taxes are calculated | After taxes are calculated |
| Effect on taxable income | Reduces taxable wages | No effect on taxable wages |
| Common examples | Traditional 401(k), HSA, some health premiums | Roth 401(k), some insurance, garnishments |
Health Insurance Deductions
Health, dental, and vision insurance premiums are typically deducted each pay period to cover the employee’s share of the plan cost. These are often, but not always, pre-tax deductions, depending on how the employer structures the benefits plan.
Retirement Deductions
Retirement deductions represent money an employee contributes to a workplace retirement plan, such as a 401(k) or 403(b). A traditional contribution is pre-tax, lowering current taxable income, while a Roth contribution is post-tax, meaning it’s taxed now but typically tax-free when withdrawn in retirement.
Wage Garnishments
A wage garnishment is a court- or agency-ordered deduction an employer is legally required to withhold from an employee’s paycheck, often for unpaid child support, tax debt, or a judgment. Employers cannot decline to apply a valid garnishment order, and there are federal limits on how much of a paycheck can be garnished.
What Does YTD Mean on a Pay Stub?
YTD stands for year-to-date. It shows the running total of a specific figure — gross pay, a tax withheld, or a deduction — from January 1 of the current year through the current pay period. YTD totals help employees track annual earnings and withholding without adding up every individual pay stub.
Gross Pay vs. Taxable Pay vs. Net Pay
| Term | Definition |
|---|---|
| Gross Pay | Total earnings before any deductions are applied |
| Taxable Wages | Gross pay minus pre-tax deductions — the amount taxes are actually calculated on |
| Net Pay | The final take-home amount after all taxes and deductions are subtracted |
Why Is My Net Pay Lower Than My Gross Pay?
Net pay is always lower than gross pay whenever any deduction applies, because net pay is defined as gross pay minus every tax and deduction taken out. For most employees, that difference reflects a combination of federal and applicable state/local tax withholding, FICA, and any elected benefits or retirement contributions.
Why Did My Paycheck Deductions Change?
Deduction amounts can change for several common reasons: a new W-4 or state withholding election, a raise that pushes part of your income into a new tax bracket, a change in benefits enrollment during open enrollment, reaching (or resetting after) the Social Security wage base limit, a new or ended wage garnishment, or a change in retirement contribution percentage.
How to Read Pay Stub Deductions
To read a pay stub accurately, work through it in order:
- Start with gross pay for the period.
- Identify and total pre-tax deductions to find taxable wages.
- Review each tax line — federal, Social Security, Medicare, and state/local if applicable.
- Review post-tax deductions, such as Roth contributions or garnishments.
- Confirm gross pay minus every deduction equals the net pay shown.
- Check the YTD column against your own running records if you keep them.
Common Pay Stub Deduction Abbreviations
| Abbreviation | Meaning |
|---|---|
| FED | Federal income tax withholding |
| FIT | Federal Income Tax |
| FICA | Federal Insurance Contributions Act (Social Security + Medicare) |
| SS | Social Security tax |
| OASDI | Old-Age, Survivors, and Disability Insurance (formal name for Social Security tax) |
| MED | Medicare tax |
| SIT | State Income Tax |
| 401K | Traditional 401(k) retirement contribution |
| HSA | Health Savings Account contribution |
| FSA | Flexible Spending Account contribution |
| YTD | Year-to-date total |
| GARN | Wage garnishment |
| INS | Insurance premium (health, dental, vision, or life) |
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What to Do If a Pay Stub Deduction Looks Wrong
If a deduction on your pay stub looks unfamiliar or incorrect, first check it against your benefits elections, most recent W-4, and any known garnishment orders. If it still doesn’t add up, or if gross pay minus total deductions doesn’t equal your net pay, raise it with your payroll or HR department promptly — most discrepancies are simple errors that are easy to correct once identified.
Why Understanding Your Pay Stub Matters
Understanding your pay stub deductions helps you verify you’re being paid and taxed correctly, plan a realistic budget around your actual take-home pay, catch payroll errors early, and make informed decisions about benefits and retirement contributions during open enrollment. A pay stub is more than a receipt — it’s a detailed record of exactly how your earnings become your take-home pay.
Frequently Asked Questions
What are deductions on a pay stub?
Deductions on a pay stub are amounts subtracted from gross pay before an employee receives their net pay. They include required withholdings like federal and state income tax, Social Security, and Medicare, as well as voluntary items like health insurance premiums and retirement contributions.
What are the most common paycheck deductions?
The most common paycheck deductions are federal income tax, Social Security tax, Medicare tax, state income tax (where applicable), health insurance premiums, and retirement plan contributions such as a 401(k).
Are all paycheck deductions taxes?
No. Some deductions, like federal income tax, Social Security, and Medicare, are taxes. Others, like health insurance premiums, retirement contributions, and wage garnishments, are not taxes at all — they are benefit costs or legally required payments unrelated to tax withholding.
What is the difference between gross pay and net pay?
Gross pay is total earnings before any deductions are taken out. Net pay, sometimes called take-home pay, is what remains after taxes and other deductions are subtracted: Gross Pay − Deductions = Net Pay.
What does pre-tax mean on a pay stub?
A pre-tax deduction is subtracted from gross pay before taxes are calculated, which lowers the amount of income that gets taxed. Common examples include traditional 401(k) contributions, HSA contributions, and many employer health insurance premiums.
What does post-tax mean on a pay stub?
A post-tax deduction is subtracted from pay after taxes have already been calculated and withheld. Roth 401(k) contributions, some disability insurance premiums, and wage garnishments are typically post-tax.
Why is taxable income different from gross income?
Taxable income is gross income minus any pre-tax deductions. Because pre-tax deductions reduce the amount subject to tax, taxable wages shown on a pay stub are often lower than total gross earnings.
What does FICA mean on my paycheck?
FICA stands for the Federal Insurance Contributions Act. It is the combined payroll tax that funds Social Security and Medicare, and it usually appears on a pay stub as one line or as separate Social Security and Medicare lines.
What does YTD mean on a paycheck?
YTD stands for year-to-date. It shows the cumulative total of earnings or deductions from the start of the calendar year through the current pay period, helping employees track annual totals across multiple paychecks.
Why are deductions different between employees earning the same salary?
Deductions vary based on individual choices and circumstances — filing status, number of tax withholding allowances, elected benefits, retirement contribution percentages, state or local residence, and any wage garnishments can all differ between two employees earning the same salary.
Can an employer deduct money from a paycheck?
Employers can only make deductions that are legally required (like taxes), authorized by the employee in writing (like benefits or retirement contributions), or mandated by a court or government order (like a garnishment). Unauthorized deductions are generally not permitted.
How can I tell if my paycheck is correct?
Compare your gross pay to your hours or salary, confirm each deduction matches your elected benefits and current tax situation, and verify that gross pay minus total deductions equals your net pay exactly. Review any unfamiliar line item with your payroll department.
Related Guides
- What Is a Pay Stub? A Complete Guide
- How to Create a Professional Pay Stub: Step-by-Step Guide
- How to Create a Pay Stub Online: Complete Step-by-Step Guide
- See a Pay Stub Example
- State Pay Stub Requirements
This article is for general educational purposes and is not tax, legal, accounting, or financial advice. Payroll and tax requirements vary by jurisdiction and individual circumstances.
Reviewed for accuracy by the PayStubPro Editorial Team, July 2026.