Your First Paycheck: What to Check Before You Cash It

What to look for on your first paycheck

Your first paycheck from a new job should match what you agreed to when you were hired. Before you deposit it, spend five minutes checking four things: your gross pay (the amount before taxes), the deductions taken out, your net pay (what actually hits your account), and the pay period dates. If any of these look wrong, contact your payroll department the same day — the longer you wait, the harder it is to fix.

Most mistakes on a first paycheck come from incomplete tax forms or a mismatch between what you told HR and what they entered into the system. Some are simple typos. A few are genuine errors in how your pay was calculated. None of them fix themselves, and all of them are easier to correct in the first week than in the first month.

Key Takeaways

• Check that your gross pay matches the salary or hourly rate you agreed to, including any overtime hours you actually worked.
• Verify that federal income tax, Social Security, and Medicare are the only mandatory deductions — everything else should have been approved by you in writing.
• Compare your net pay (the amount deposited) to what you expected after taxes, and ask payroll to explain any gap you don't recognize.
• If something is wrong, report it to your payroll department or HR within the first week, when records are fresh and corrections are fastest.
• Keep your pay stub — it's proof of income for loans, apartments, and taxes, and it shows what deductions came out each pay period.

Gross pay: what you earned before taxes

Your gross pay is the total amount you earned during the pay period, before any money comes out. For a salaried employee, this should be your annual salary divided by the number of pay periods per year (usually 26 for biweekly, 24 for semi-monthly, or 12 for monthly). For an hourly employee, it should be your hourly rate multiplied by the hours you worked, plus any overtime at the rate you were promised.

Check the pay stub for the pay period dates — the first and last day covered by this paycheck. Make sure those dates match the time you actually worked. If you started mid-week, your first paycheck might only cover a few days, and that's normal. If the dates don't match when you started, ask payroll to clarify.

If you worked overtime and your paycheck doesn't reflect it, or if the hourly rate is wrong, contact payroll immediately with the dates and hours you worked. Bring any written offer letter or email that confirms what you were supposed to be paid.

Deductions: what comes out and why

Deductions are money taken from your gross pay before you receive it. Some are mandatory — your employer is required by law to withhold them. Others are voluntary — you chose them and signed a form to authorize them.

The mandatory deductions on almost every paycheck are federal income tax withholding, Social Security tax (6.2% of gross pay), and Medicare tax (1.45% of gross pay). Depending on where you live and work, you may also see state income tax, local income tax, or city tax. These are all normal and required.

Any other deduction — health insurance premiums, retirement contributions, life insurance, garnishments, or union dues — should only appear if you signed a form authorizing it. If you see a deduction you don't recognize, don't assume it's a mistake; ask payroll what it is. Sometimes HR sets up benefits automatically, and sometimes there's a genuine error. Either way, you need to know.

The amount of federal income tax withheld depends on the W-4 form you filled out when you were hired. If too much or too little is being withheld, you can adjust it by submitting a new W-4 to payroll — but that's a separate step from checking your first paycheck.

Net pay: what actually reaches your account

Your net pay is your gross pay minus all deductions. This is the amount that should be deposited into your bank account (or issued as a check, depending on how you set up direct deposit). Before your first paycheck arrives, do the math yourself: take your gross pay, subtract the mandatory taxes, subtract any voluntary deductions you authorized, and see if you get close to the net pay shown.

If there's a gap you can't explain, write down the difference and ask payroll about it. Bring your pay stub and your calculation. Payroll can usually tell you immediately whether it's a deduction you forgot about, a tax adjustment, or an error on their end.

If you haven't set up direct deposit yet, your paycheck might be issued as a paper check instead. That's fine for the first paycheck, but ask HR how to enroll in direct deposit so future paychecks go straight to your bank account. It's faster and safer than carrying a check.

Tax withholding and your W-4

The amount of federal income tax taken from your paycheck is based on the W-4 form you completed during onboarding. The W-4 asks about your filing status, whether you have dependents, and whether you have other income. Payroll uses this information to calculate how much federal tax to withhold from each paycheck.

On your first paycheck, the withholding might feel high or low depending on what you put on the W-4. If you claimed zero dependents and you're single, more tax comes out. If you claimed dependents or you're married filing jointly, less comes out. This is normal variation, not an error.

If you think too much or too little is being withheld, you can change it by submitting a new W-4 to payroll. This doesn't affect your first paycheck — it affects future ones. You don't need permission to change your W-4; you can do it anytime.

Common first-paycheck mistakes and how to fix them

The most common mistake is an incomplete or incorrect W-4, which causes the wrong amount of tax to be withheld. This isn't really a mistake — it's just a mismatch between what you told HR and what you actually owe. You'll sort it out when you file taxes next year, but you can also fix it now by submitting a corrected W-4.

The second most common issue is a deduction appearing that you don't remember authorizing. Sometimes HR sets up health insurance or retirement contributions automatically, and sometimes you signed a form during onboarding without realizing what it was. Ask payroll to show you the authorization form. If you didn't sign it, they can remove it. If you did sign it but didn't mean to, ask whether you can opt out.

A third issue is that your hourly rate or salary was entered wrong into the payroll system. This is rare but fixable. Bring your offer letter or the email confirming your pay rate, and payroll can correct it for the next paycheck and sometimes issue a corrected check for the first one.

If your paycheck is significantly smaller than you expected and you can't find the reason on the pay stub, don't wait. Call payroll the same day and ask them to walk you through the deductions line by line. Most issues are resolved in one conversation.

Keeping your pay stub and what it's used for

Your pay stub is a record of what you earned and what was deducted. Save it — you'll need it for several things. When you apply for a loan, rent an apartment, or file taxes, you may be asked to show recent pay stubs as proof of income. Your employer might also ask for it if there's ever a dispute about what you were paid.

Keep at least the last two or three pay stubs in a safe place, either printed or digital. You don't need to keep every single one forever, but keeping them for a year is a good practice. If you ever need to dispute a deduction or prove your income, the pay stub is your evidence.

Your pay stub also shows you how much you've paid in taxes and Social Security so far in the year. This information is useful when you file your tax return, and it helps you understand whether your withholding is on track.

Frequently Asked Questions

Why is my first paycheck smaller than I thought it would be?

Federal income tax, Social Security, and Medicare are taken out automatically, and the amount depends on your W-4 and your pay rate. If you were hired mid-week, you may have worked fewer hours than a full pay period. Check your pay stub for the pay period dates and the deductions listed. If the numbers still don't make sense, contact payroll with your calculation.

What if I made a mistake on my W-4?

You can submit a corrected W-4 to payroll anytime. It won't change your first paycheck, but it will change future ones. Bring the new W-4 to HR or payroll, and they'll update your file. You don't need your employer's permission to change it.

Can I get my first paycheck corrected if something is wrong?

Yes, but you have to report it quickly. Contact payroll within the first week with the specific error and any documentation (like your offer letter). Some errors can be corrected with a supplemental check; others are fixed starting with the next paycheck. The sooner you report it, the sooner it gets fixed.

Do I need to keep my pay stubs?

Yes. Keep at least the last two or three for proof of income if you apply for a loan or apartment. You'll also need them if you ever dispute a deduction or if your employer questions what you were paid. Keeping them for a full year is a good practice.

What if I don't recognize a deduction on my pay stub?

Ask payroll what it is. Don't assume it's a mistake — it might be a benefit you authorized during onboarding, or it might be a required deduction you weren't aware of. Payroll can explain every line and show you the authorization if one exists. If you didn't authorize it, they can remove it.