What each line on an ADP pay stub means, plus a free tool to check it against your gross pay.
What This Page Is For
If you searched "paycheck calculator ADP," you're most likely trying to do one of two things: estimate what a job offer's stated salary will actually pay out per check, or check that a stub your employer's ADP-run payroll system generated looks right. This page covers both. ADP (Automatic Data Processing) is one of the largest payroll processing companies in the country; a huge number of U.S. employers use its software to calculate withholding and issue pay stubs, whether printed, emailed as a PDF, or delivered through an ADP self-service portal called ADP Workforce Now or ADP iPay. This page is not affiliated with, endorsed by, or sponsored by ADP, Inc. We don't use their logo and we don't claim any partnership. It's a plain, factual guide to what shows up on a typical ADP-processed stub and how to check it.
The Lines on a Typical ADP Pay Stub
ADP's exact layout varies by employer, but most stubs it generates include the same core lines, sometimes abbreviated:
- Gross Pay, sometimes "Regular" plus "Overtime" as separate lines, your full earnings for the period before anything is withheld.
- Fed Withhold or FIT, federal income tax withheld, calculated from your W-4 and the IRS withholding tables.
- Soc Sec or OASDI, Social Security tax, 6.2% of wages up to the annual wage base.
- Medicare or MED, 1.45% of all wages, no cap.
- A state line, labeled with your state's abbreviation plus "SIT" (state income tax), if your state has one. Texas and Florida employees typically see no state tax line at all.
- Other deductions, 401(k) contributions, health insurance premiums, HSA contributions, and similar, listed by name, each reducing your net pay and, for pre-tax items, your taxable wages too.
- Net Pay, sometimes "Net Check" or "Take Home," what actually gets deposited.
- YTD (year-to-date) columns next to most lines, the running total for each since January 1.
How to Check Your ADP Stub Against This Calculator
Enter your gross pay for one period and your pay frequency above, and pick your state if it's one we model. Compare the results panel line by line against your stub: our "Federal income tax" against ADP's "Fed Withhold" or "FIT," our Social Security and Medicare rows against ADP's "Soc Sec"/"OASDI" and "Medicare," and our state row against your stub's state tax line. Expect the numbers to be close, not identical, for the reasons in the next section. If your ADP stub shows a materially different federal number and you can't explain it from a deduction or extra withholding, that's worth a look at your W-4, not a sign this calculator or ADP's system is broken.
Why the Numbers Won't Match Exactly
This calculator assumes a single filer taking the standard deduction, no dependents, no extra withholding, and no pre-tax deductions. ADP's system doesn't assume anything, it reads your actual W-4 and payroll setup: your filing status, any dependents or other credits you claimed on the 2020-or-later W-4 form, extra dollars you asked to have withheld, a multiple-jobs adjustment if you have more than one employer, and, critically, any pre-tax deductions like a traditional 401(k) contribution or a pre-tax health insurance premium. Pre-tax deductions come out of your gross pay before federal (and usually state) tax is calculated, which lowers your taxable wages and therefore your withholding, something this calculator does not model. If you contribute to a 401(k) or pay pre-tax premiums, expect your real federal and state withholding to run a bit lower than this tool's estimate, and your real net pay to differ from this tool's net pay by roughly the amount of those deductions themselves.
A Worked Example
Say your ADP stub shows $2,500 gross for a biweekly pay period, no pre-tax deductions, single, standard W-4. Annualized, that's $65,000. Subtract the $16,100 federal standard deduction (2026, single) and $48,900 is taxable. Federal tax: 10% of the first $12,400 ($1,240) plus 12% of the remaining $36,500 ($4,380), for $5,620 a year, or $216.15 a paycheck. FICA: Social Security $2,500 × 6.2% = $155.00; Medicare $2,500 × 1.45% = $36.25. With no state tax (say you work in Texas or Florida), net pay works out to $2,500 − $216.15 − $155.00 − $36.25 = $2,092.60, which is what you'd expect to see as "Net Pay" on the stub in that scenario, before any 401(k) or insurance deduction. Enter your own numbers above to run the same math.
What We Don't Do on This Page
We don't reproduce ADP's own software, quote ADP's pricing for employers, or claim any relationship with ADP, Inc. beyond referencing their product name because it's what people searching for this page actually have in front of them. If you're an employer evaluating payroll providers, ADP's own site is the source for current plans and pricing, not us.
Frequently Asked Questions
What does ADP stand for and what does it do?
ADP (Automatic Data Processing) is a payroll and human resources company. Many employers use ADP's software to calculate pay, withhold taxes, and issue pay stubs, whether on paper, as a PDF, or through an employee self-service portal. If your stub has an ADP logo or your employer mentions ADP for payroll, that's what's happening behind the scenes: your employer entered your pay and W-4 information, and ADP's system calculated the withholding and produced the stub.
Why do the lines on my ADP stub have different labels than this calculator?
Payroll systems use their own internal labels, and ADP's are no exception. Common ADP stub abbreviations include "Fed Withhold" or "FIT" for federal income tax, "OASDI" or "Soc Sec" for Social Security, "Medicare" or "MED," and a state abbreviation like "CA SIT" for state income tax. The dollar amounts are what to compare against this calculator's federal, Social Security, Medicare, and state rows, not the exact wording.
My ADP-withheld federal tax doesn't match this calculator. Is one of us wrong?
Not necessarily. ADP's system runs the IRS wage-bracket withholding tables against your actual W-4: your filing status, any dependents you claimed, extra withholding you requested, a second job adjustment, and any pre-tax deductions (401(k), health insurance) that lower your taxable wages before withholding is even calculated. This calculator assumes a single filer, the standard deduction, and nothing pre-tax, so it will land close but rarely exact. A large, consistent gap is worth checking against your actual W-4 on file with your employer.
What is "YTD" on my ADP stub?
Year-to-date: the running total of that line item since January 1, not just this pay period. It's useful for checking you're on pace, for example confirming your YTD Social Security withholding is tracking toward, but not past, the annual wage base.
Does ADP set my tax withholding, or does my employer?
Neither, directly. You set it, through the W-4 you filled out (or update anytime through your ADP self-service portal, if your employer offers one). ADP's software applies the IRS's official withholding tables to whatever your W-4 says. If your withholding looks wrong, the fix is usually a new W-4, not a support ticket.
Is FigureNerd affiliated with ADP?
No. We are not affiliated with, endorsed by, or sponsored by ADP, Inc. We reference ADP because a large share of paychecks in the U.S. are processed through their systems, and readers search for help understanding an ADP-issued stub specifically. Nothing on this page implies a partnership.
Is this calculator tax or legal advice?
No. It's an educational tool for sanity-checking a paycheck number. For your exact withholding, your actual pay stub and your employer's payroll or HR department are the authoritative source, not this calculator.