Authorship and editorial responsibility
Numurio is maintained by an independent editorial team that builds and reviews the calculation datasets behind these pages. Individual names are not published, and no professional licence is claimed — what follows is the part that can actually be verified: who decides what ships, and how a figure is allowed onto a page.
The review chain
A number reaches a page through four gates, in this order. Skipping any of them is treated as a defect, not a shortcut.
- Primary document. A rate must come from the authority that sets it — the IRS notice, the §32a statute text, the ATO rate page, the Receita Federal table — and be recorded in the dataset's source list with a date. Secondary commentary is used only to locate the primary document.
- Dataset edit. The change lands in a JSON dataset with its tax year, review date and status, never directly in a page template. That keeps thousands of pages consistent and makes a correction one edit instead of many.
- Engine self-test. Each market has a self-test that asserts the published examples, boundary behaviour and monotonicity. A market whose self-test fails does not ship.
- Page verification. Rendered pages are fetched and checked for status, title and description length, canonical and language declarations, and structured data before release.
What is claimed, and what is not
Claimed: the arithmetic matches the published tables within the tolerances stated on each market page, the sources are listed and dated, and what is not modelled is printed rather than hidden. Not claimed: that any result equals your employer's withholding to the cent, that the site substitutes for a tax professional, or that a page numbers a rule that the dataset does not contain.
Who is not on this team
There is no CPA, enrolled agent or tax attorney on staff, and this page will not pretend otherwise. Inventing a credential list is the easiest way to fail a YMYL review, and it would also be a lie. What stands in for the credential is the chain above: every figure is computed from a published statutory table, that table is cited and dated on the sources page, and every market carries a self-test that fails the build if a published example stops matching.
Where a judgement call is genuinely required — equity compensation, a split-year multi-state residency, a dispute over withholding — the answer is a CPA or an enrolled agent who can see your facts. This site is built for the arithmetic that follows once those facts are settled.
Corrections
A correction is made by editing the dataset and rebuilding, then re-running the market self-test and the site-wide fetch check. Where a figure was wrong because a statutory table changed, the review date on the market page moves with it; where a figure was wrong because the engine misread a rule, the self-test gains a case so the defect cannot return silently.
If a number here disagrees with an official publication, the official publication is right. The sources page names every document each market rests on, and the methodology page explains the chain.
Editorial independence
The site carries no advertising, no affiliate links and no sponsored placements, so no commercial relationship can influence a rate or a page selection. Source links go to government publishers only.