How to choose a pay stub generator (and spot a fake)
Pick the right pay stub generator: what the tax engine must cover, the red flags that reveal a fake stub, and where cheap tools cut corners.
Most pay stub generators work the same way: a two- or three-step web form, a PDF in a couple of minutes, no account required. For a one-off need that is fine. For an employee relationship that persists across pay periods, the things that look like minor differences (tax-engine correctness, YTD accumulation, an immutable record) are the things that matter. This guide covers what a generator needs to do correctly, how to evaluate one, and how to recognize a stub that should not be trusted.
SimpleStub makes pay stubs. It does not file taxes, move money, or give tax or legal advice.
What does a pay stub generator actually do?
A pay stub generator takes the inputs you enter (pay rate, pay period, deductions, prior YTD) and produces a formatted document showing gross pay, each withholding line, and net pay. The better ones maintain a tax engine that applies real IRS and state tables; the worse ones format whatever numbers you type. The output is always a PDF. The generator does not remit anything to any agency; that is payroll.
For 2026, a generator that claims to be accurate should apply:
- Federal income-tax withholding using the IRS Pub 15-T percentage method (IRS Publication 15-T).
- Social Security at 6.2% on wages up to the annual wage-base cap, and Medicare at 1.45%, plus the Additional Medicare Tax above the applicable threshold (IRS Topic No. 751).
- The correct state withholding tables for the state you select.
That is the baseline. Everything beyond it is where generators start to diverge.
What should you look for in a pay stub generator?
A reliable generator has five things:
| Criterion | Why it matters |
|---|---|
| A real, maintained tax engine | Federal withholding must follow IRS Pub 15-T; the Social Security wage-base cap and Additional Medicare threshold change annually. A static engine quietly produces wrong numbers. |
| YTD as an accumulating invariant | Year-to-date totals must carry forward from prior issued periods, not be recomputed each time from scratch. Two stubs for the same employee that contradict each other on YTD are the clearest sign something is wrong. |
| An immutable employer record | There should be a way to confirm the stub was issued by that employer and has not been altered. A PDF that anyone can recreate is not a record. |
| Special-case handling included | F-1 nonresident-alien employees are FICA-exempt under IRC 3121(b)(19). Multi-state reciprocity exists. These are not edge cases; they are standard situations the engine should handle correctly by default, not by paid upgrade. |
| Branded output as a baseline | Your logo on the stub is a basic authenticity signal, not a premium feature. |
The category broadly claims all five. The question is which generators actually deliver them.
What are the most common ways generators cut corners?
The tax engine is absent or unenforced. The most common failure is a generator that accepts whatever tax figures you type and outputs them. It might display a "suggested" number you can override. That is not a tax engine; it is a calculator wrapper with a legal escape hatch built in.
"Correct taxes" is a paid add-on. Some generators charge extra to unlock accurate withholding or to suppress a watermark before purchase. Charging to remove a watermark placed on a document you are about to pay for is fraud-adjacent. Charging extra for correct taxes implies the base calculation is not trusted.
YTD is recomputed from inputs each session. If you generate two stubs for the same employee in two sessions and the YTD figures do not reconcile, the tool has no memory of what was previously issued. Any lender or auditor who checks the math across multiple stubs will find the inconsistency.
"Not a legal document" next to "100% accurate." The combination is a tell. One claim protects the vendor; the other sells the product. They cannot both be fully true.
Multi-state support is shallow. Claiming all 50 states and correctly handling reciprocity agreements, local taxes, and nonresident situations are different things. An employee who lives in one state and works in another, or an F-1 student exempt from FICA, will get wrong output from a shallow engine even when the generator lists their state.
What red flags reveal a fake stub?
These signals, whether you are reviewing a stub someone gave you or deciding whether your generator output is trustworthy, indicate a document that should not be relied on:
- YTD figures that do not accumulate correctly across an employee's stubs for the year.
- Taxes that are suspiciously round numbers (e.g., exactly $400.00 in federal withholding every period regardless of gross pay).
- Missing or generic employer details: no EIN, no address, or a name that cannot be verified.
- No way to confirm the stub was ever issued by the employer named on it.
- A watermark that disappears only after payment.
- Withholding rates that are simply wrong for the stated pay period and gross, easily checked against IRS Pub 15-T.
The most reliable check is the YTD math. Add up each period's gross pay and compare to the YTD gross on the final stub. If they do not match, the numbers were typed, not computed.
When is a cheap per-stub tool the right call?
For a single stub, a one-time contractor relationship, or a proof-of-income document you need in the next ten minutes, a per-stub tool priced at a few dollars is hard to beat. The calculus changes when:
- You issue stubs repeatedly for the same employee and need the YTD to be consistent and defensible.
- A third party (a lender, a government agency, an auditor) will compare multiple stubs or ask how to verify one.
- Your workforce includes workers with nonstandard tax situations, such as F-1 nonresident aliens who should have no FICA withheld.
- You need a record that proves what you paid, not just a document that says you paid it.
Price per stub is one input. Correctness, verifiability, and durability of the record are the others.
Straight answers
What is the difference between a pay stub generator and payroll software?
A pay stub generator produces the paper document. It calculates gross-to-net and outputs a PDF. Payroll software also files tax forms (941, W-2) and moves money via direct deposit or check. SimpleStub makes the stub; it does not file taxes or move money.
How do I spot a fake pay stub?
The clearest tell is inconsistent YTD figures: if two stubs for the same employee in the same year show year-to-date totals that do not add up across periods, the numbers were typed rather than computed from an accumulating record. Also check for round-number taxes, missing employer details, and no way to verify the stub was ever issued.
Is a free pay stub generator accurate?
Free generators are usually PDF templates that format whatever you type with no tax math. They look like real stubs but produce whatever numbers you enter. For a document that may be reviewed by a lender or auditor, a template with no engine is not a safe choice.
Does a pay stub generator handle state taxes?
Most claim all-50-states support. Claiming support and computing the right amount are different things. Multi-state reciprocity, local taxes, and special-case employees (like F-1 nonresident aliens who are FICA-exempt under IRC 3121(b)(19)) go wrong in most generators unless the engine is actively maintained.
When should I use a per-stub tool versus a service with a real record?
For a single throwaway stub with no ongoing relationship, a per-stub tool is hard to beat on price. When you have a real employee, issue stubs repeatedly, or need to prove what you paid (a lender, an audit, a visa renewal), a verifiable, durable record matters more than saving a few dollars per stub.
Pay stubs, not payroll.
SimpleStub generates compliant pay stubs in minutes, with Federal, Massachusetts, and F-1 / FICA handling built in.
Figures reflect tax year 2026. SimpleStub is a document tool, not tax, accounting, or legal advice.