By Mudassir Khan
How OvertimePayPro researches the rules, how often they are rechecked, who writes the content, and how corrections work.
Rules verified November 2026 · Sources: U.S. Department of Labor, IRS
Every number on OvertimePayPro starts from a primary source, not from another calculator site. For pay rules, that means the U.S. Department of Labor's Wage and Hour Division: its overtime pay guidance and Fact Sheet 23, which state the federal overtime requirements in plain terms. For the 2025 to 2028 overtime deduction, it means IRS guidance on the Working Families Tax Cuts provisions, which is where the deduction comes from. For state specific rules, it means the state labor agency itself, such as the California Department of Industrial Relations overtime FAQ that our California calculator follows.
When a rule is unclear, we read the source document itself rather than trusting a summary. When two sources seem to disagree, the government source wins. And when a calculator has to simplify, which every calculator must, the page says what was simplified so you can judge the result fairly.
Pay rules and tax guidance change. The overtime deduction in particular is new law, and IRS guidance around it is still being refined. That is why every page on this site carries a "Rules verified" line with a month and year: it tells you when the rules behind that page were last checked against the primary sources.
The cadence is monthly. At each check we reread the DOL overtime guidance, the IRS provisions page, and the state pages we cite, and we update any calculator or guide whose rule has moved. If a change is significant, the affected pages are updated first and the verified line moves to the new month.
If you spot an error, or a rule that has changed and we have not caught it yet, we want to hear about it. Send the correction through the contact page, ideally with a link to the official source, and we will check it against the primary documents. Confirmed errors are fixed promptly, and the page's verified line is updated to reflect the new check. Corrections are treated as a feature of this site, not an embarrassment: a calculator is only useful if its rules are right.
OvertimePayPro is built and maintained by Mudassir Khan, a web developer who makes free payroll math tools. There is no editorial team and no sponsored content. The site is independent: it is not affiliated with the U.S. Department of Labor, the IRS, or any government agency, and no government body reviews or endorses these calculators.
Nothing here is tax, legal, or payroll advice. The calculators are simplified models of rules that contain exceptions: alternative workweeks, industry specific regulations, union agreements, exemptions, and state and local variations can all change a real result. Use the results as a starting point for checking your pay, then confirm anything that matters with your employer, a qualified tax professional, or your state labor agency. The full limits are spelled out in our disclaimer.
There is no signup, no account, and no paywall. Every calculator runs entirely in your browser: the numbers you type never leave your device. We do not sell personal data and we do not build profiles of visitors. The details are in our privacy policy.
OvertimePayPro earns nothing from the rules it explains. No calculator result is influenced by an advertiser, a payroll company, or a tax preparer, and the site does not sell leads or recommend professionals. The only thing the site asks of you is that you check the math, which is why every calculator shows its working.
Pay rules on this site follow the U.S. Department of Labor overtime pay guidance and Fact Sheet 23: overtime pay requirements of the FLSA. Deduction rules follow IRS guidance on the Working Families Tax Cuts provisions.