What a checker does
A checker takes the facts you enter and applies the rules we have read and cited. It shows each step as a numbered line, so you can follow the arithmetic and check it yourself. It gives an estimate, not a decision.
Where our facts come from
We work from primary sources: federal and state statutes, regulations, tax forms and their instructions, and guidance from the agencies that enforce them, such as the IRS, state revenue departments and state workforce agencies. For wage figures we use the U.S. Bureau of Labor Statistics. We link each source so you can read the text yourself.
We do not use other websites’ summaries as a source of a rule.
How each page is checked
- Before a page or a checker goes live, its facts are researched and then checked a second time, independently, against the same primary sources.
- Each page shows the date we last checked it against its sources.
- Tax rates, wage bases and fees change, most often in January. We watch the sources for those changes and update the pages that rely on them.
How we write
- We say what the numbers and the rules say. We do not say what you should do.
- We describe estimates as estimates and say what they leave out.
- We do not invent reviews, testimonials, experts or test results.
Corrections
If you find an error, email us at contact@biztester.com. Tell us the page and, if you can, the source that shows the error. We check each report against the sources the page cites. When we confirm an error, we fix it. When a fix changes a figure or a rule on a page, we add a correction note to that page.
Money never changes a figure
Some links on this site are affiliate links, and we may earn a fee when you sign up through one. A fee never changes a figure, a rule or a result on this site. No company pays us to appear in a checker’s result. We do not sell link placements, and we do not buy links to this site. Our affiliate disclosure has the details.
Talk to your own advisor
This site gives general information, not advice for your situation. Your taxes depend on facts a checker does not ask about. Before you file an election or change how you pay yourself, confirm the decision with your own CPA or tax advisor.
Last updated: October 24, 2026