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Most people glance at their pay stub, check the net pay number at the bottom, and move on. If that sounds like you, no judgment. But those other lines on your pay stub are not just noise. They tell you exactly where your money is going, whether your tax withholding is right, and whether you are on track with your retirement contributions.
Understanding your pay stub takes maybe 10 minutes of effort, and it can save you hundreds or even thousands of dollars over time. Let me walk through every single line you will see on a typical pay stub so you never have to wonder what any of it means again.
Gross Pay vs. Net Pay: The Two Numbers That Matter Most
Before we dive into the individual deductions, you need to understand the two bookend numbers on every pay stub.
Gross pay is your total earnings before anything is taken out. If you are salaried, this is your annual salary divided by the number of pay periods (typically 24 for semi-monthly or 26 for biweekly). If you are hourly, it is your hours worked multiplied by your hourly rate, plus any overtime.
Net pay (sometimes called “take-home pay”) is what actually hits your bank account after all taxes and deductions are subtracted. This is the number most people focus on, but the gap between gross and net is where the real story lives.
Here is a quick example to ground us. Let us say you earn $60,000 per year, paid biweekly. Your gross pay each paycheck would be roughly $2,307.69. But after taxes and deductions, your net pay might be closer to $1,650 to $1,750. That $550 to $650 difference is not just “disappearing.” Every dollar goes somewhere specific.
An Annotated Pay Stub Example
Here is what a simplified pay stub might look like for someone earning $60,000 per year, paid biweekly, with a 6% 401(k) contribution and employer-provided health insurance:
| Line Item | Current Period | YTD |
|---|---|---|
| Gross Pay | $2,307.69 | $27,692.28 |
| Federal Income Tax | -$197.54 | -$2,370.48 |
| Social Security Tax (OASDI) | -$143.08 | -$1,716.96 |
| Medicare Tax | -$33.46 | -$401.52 |
| State Income Tax | -$92.31 | -$1,107.72 |
| 401(k) Pre-Tax | -$138.46 | -$1,661.52 |
| Health Insurance Premium | -$85.00 | -$1,020.00 |
| Net Pay | $1,617.84 | $19,414.08 |
That is $689.85 taken out of a $2,307.69 paycheck, roughly 30%. Let us break down every category.
Federal Income Tax Withholding
This is usually the largest single deduction on your pay stub. Your employer withholds federal income tax based on the information you provided on your W-4 form when you were hired (or last updated it).
The amount withheld depends on several factors:
- Your filing status (single, married filing jointly, head of household)
- The number of allowances or adjustments you claimed
- Any additional withholding you requested
- Your income level
Important: the amount withheld each paycheck is an estimate. It is your employer’s best guess at what you will owe when you file your tax return. If they withhold too much, you get a refund. If they withhold too little, you owe money in April.
We will come back to why this matters and how to get it right in a later section.
Social Security Tax (OASDI)
You will see this labeled as “Social Security,” “OASDI” (Old-Age, Survivors, and Disability Insurance), or sometimes just “SS” on your pay stub.
The rate is 6.2% of your gross pay, and your employer pays a matching 6.2% on top of that. There is an annual wage cap, which for 2026 is $176,100. Once your year-to-date earnings hit that cap, Social Security tax stops being withheld for the rest of the year. If you earn under $176,100, you will pay this on every paycheck all year long.
For our $60,000 example: $2,307.69 x 6.2% = $143.08 per paycheck. You can verify the current year’s tax rates on the Social Security Administration’s website.
Medicare Tax
Medicare tax is 1.45% of your gross pay with no income cap. Unlike Social Security, you pay Medicare tax on every dollar you earn, no matter how high your income goes.
There is an Additional Medicare Tax of 0.9% on earnings above $200,000 (single) or $250,000 (married filing jointly). If you earn under these thresholds, you will only see the flat 1.45%.
For our example: $2,307.69 x 1.45% = $33.46 per paycheck.
Together, Social Security and Medicare are often called FICA taxes (Federal Insurance Contributions Act). Combined, they take 7.65% of your pay (up to the Social Security wage cap).
State and Local Taxes
Depending on where you live and work, you may see one or more of these on your pay stub:
- State income tax: Rates vary widely. States like California and New York have rates above 10% for higher earners, while states like Texas, Florida, and Washington have no state income tax at all.
- Local/city income tax: Some cities (New York City, Detroit, Philadelphia, and others) levy their own income taxes on top of state taxes.
- State disability insurance (SDI): Required in a handful of states including California, New Jersey, and New York.
If you live in a state with no income tax, consider yourself lucky. That is one fewer line on your pay stub and more money in your pocket. You can find your state’s specific tax details in IRS Publication 15, which covers employer tax obligations including state-level guidance.
Pre-Tax Deductions
These are the deductions that come out before taxes are calculated on your income. They reduce your taxable income, which means you pay less in federal (and usually state) income tax. This is a good thing.
Common pre-tax deductions include:
401(k) or 403(b) Contributions
If your employer offers a retirement plan and you are contributing, you will see this deduction on every pay stub. Traditional 401(k) contributions are pre-tax, meaning the money goes directly from your gross pay into your retirement account without being taxed first.
For our $60,000 example with a 6% contribution rate: $2,307.69 x 6% = $138.46 per paycheck. That $138.46 reduces your taxable income, so you are not paying income tax on that money now. You will pay taxes when you withdraw it in retirement.
If your employer offers a match, make sure you are contributing enough to get every dollar of it. Our guide on 401(k) plans and employer matching breaks this down in detail.
Health Savings Account (HSA)
If you are enrolled in a high-deductible health plan (HDHP), you may be contributing to an HSA through payroll deductions. HSA contributions made through payroll are pre-tax and also avoid FICA taxes, making them one of the most tax-efficient savings vehicles available.
The HSA is genuinely one of the most powerful accounts in personal finance. Read our full breakdown on why the HSA is the ultimate triple-tax-advantage account.
Health Insurance Premiums
Most employer-sponsored health insurance premiums are deducted pre-tax through what is called a Section 125 (cafeteria) plan. This means your medical, dental, and vision insurance premiums reduce your taxable income.
On your pay stub, you might see these broken out separately (medical, dental, vision) or combined into one line. Either way, these are typically pre-tax.
Flexible Spending Account (FSA)
If you have a healthcare FSA or dependent care FSA, your contributions are deducted pre-tax from each paycheck. Remember that healthcare FSAs generally have a “use it or lose it” rule (with a small rollover allowance), so do not over-contribute.
Post-Tax Deductions
These deductions come out after taxes have been calculated. They do not reduce your current taxable income.
Roth 401(k) Contributions
If you are making Roth 401(k) contributions instead of (or in addition to) traditional 401(k) contributions, these are post-tax. The money is taxed now, but it grows tax-free and you will not owe taxes on qualified withdrawals in retirement.
On your pay stub, Roth contributions will be listed separately from traditional 401(k) contributions. Make sure you know which type you are making.
Life Insurance (Employer-Provided Above $50,000)
Many employers provide a basic life insurance policy for free. However, if the coverage exceeds $50,000, the cost of the excess coverage (called “imputed income”) becomes taxable. You might see a small post-tax deduction or an addition to your taxable income for this.
Disability Insurance
Short-term and long-term disability premiums may be deducted post-tax, depending on how your employer structures the plan. Paying premiums post-tax has an advantage: if you ever need to use the disability benefit, the payouts would be tax-free.
Garnishments
If you have court-ordered wage garnishments (for child support, unpaid debts, student loans in default, or tax levies), these appear as post-tax deductions. They are mandatory and your employer is legally required to withhold them.
Union Dues
If you belong to a union, your dues are typically deducted post-tax from each paycheck.
YTD Totals: Your Running Scorecard
The Year-to-Date (YTD) column on your pay stub shows cumulative totals for the calendar year. This is where you track the big picture:
- YTD Gross Pay: How much you have earned so far this year. Useful for projecting whether you are on track with your annual salary, and for checking if you are approaching the Social Security wage cap.
- YTD Federal Tax Withheld: Compare this to your expected tax liability to see if you are on track or way off.
- YTD 401(k) Contributions: Are you on pace to max out? The 2026 limit for employees under 50 is $23,500. Divide by the number of pay periods to figure out your per-paycheck target.
- YTD Social Security Tax: Once this reaches the annual cap ($176,100 in wages x 6.2% = $10,918.20), you will stop seeing this deduction.
Check your YTD totals at least quarterly. They should roughly match the numbers on your W-2 at year end.
How Your W-4 Affects Everything
Your W-4 form is the single biggest lever you have over your federal tax withholding. The current version (revised in 2020) no longer uses “allowances.” Instead, it asks for:
- Filing status (single, married filing jointly, head of household)
- Multiple jobs or spouse works (adjustments if you have more than one income source)
- Dependents (claim credits for qualifying children and other dependents)
- Other adjustments (additional income like freelance work, deductions above the standard deduction, extra withholding per paycheck)
If you have not updated your W-4 since you were hired, or if your life circumstances have changed (got married, had a kid, picked up a side gig), your withholding might be off. Use the IRS Tax Withholding Estimator to check whether your current withholding is on target.
Common Mistakes to Watch For
Over-Withholding: The Interest-Free Loan to the IRS
If you consistently get a large tax refund every spring, that is not the government being generous. It means you have been over-withholding all year. A $3,000 refund means you gave the IRS an extra $250 per month that could have been in your pocket, in a savings account earning interest, or going toward paying down debt.
A small refund ($200 to $500) is fine as a buffer. But if your refund is consistently $1,000 or more, adjust your W-4 to reduce withholding. That money is better off working for you throughout the year.
Under-Withholding: The April Surprise
On the flip side, if you owe a large amount at tax time, you are under-withholding. This can trigger IRS penalties if you owe more than $1,000 and did not pay at least 90% of your tax liability through withholding or estimated payments. Adjust your W-4 or make quarterly estimated payments to avoid this.
Not Checking Your Pay Stub at All
Payroll errors happen more often than you would think. Wrong tax filing status, incorrect retirement contribution percentage, being charged for benefits you did not elect. If you never look at your pay stub, you will never catch these mistakes.
Review your first pay stub of the year closely, and spot-check at least once per quarter after that.
Ignoring Pre-Tax Opportunities
If your employer offers a 401(k) match and you are not contributing enough to get the full match, you are literally leaving free money on the table. Same goes for HSAs and FSAs. Pre-tax deductions reduce your tax burden while building your financial future.
How to Check If Your Withholding Is Right
Here is a quick process you can run through in about 15 minutes:
- Gather your most recent pay stub with YTD totals.
- Go to the IRS Tax Withholding Estimator and enter your information.
- Compare the estimator’s recommendation to your current W-4 settings.
- If adjustments are needed, fill out a new W-4 and submit it to your HR or payroll department. The change typically takes effect within one to two pay periods.
This is especially important if any of the following happened this year:
- You got married or divorced
- You had a child
- You started a side job or freelance work
- You bought a home
- Your spouse started or stopped working
- You had a significant change in income
For a broader walkthrough on tax filing, check out our guide on how to file taxes as a beginner.
Putting It All Together
Your pay stub is not just a receipt. It is a financial dashboard that tells you:
- How much you actually earn (gross pay)
- How much goes to taxes (federal, state, FICA)
- How much you are saving (retirement contributions, HSA)
- How much you take home (net pay)
- Whether you are on track for the year (YTD totals)
Once you understand each line, you can make smarter decisions. You can optimize your tax withholding so you are not giving the government an interest-free loan. You can verify that your 401(k) contributions are hitting the right percentage. You can catch payroll errors before they snowball.
Take 10 minutes this week to pull up your most recent pay stub and go through it line by line using this guide. If something looks off, ask your HR or payroll department. And if your withholding needs adjusting, update your W-4 now rather than waiting until tax season to deal with the consequences.
Your paycheck is the foundation of your entire financial life. You should know exactly what is happening to every dollar before it reaches your bank account.