Skip to content
TNToolsNexus

How we verify

A calculator is only as good as the numbers inside it. This page explains where those numbers come from, how they are checked, who signs off, and what happens when something is wrong.

Figures come from the source, then a second source

The rule for every figure a finance, tax or legal page relies on — a tax bracket, a contribution limit, a state rate, a child-support guideline amount: take it from the official source that sets it (the statute, or the agency's current guide, form or withholding table), then check it against a second independent source. Each page lists its sources so you can check them yourself.

When sources disagree, we wait

If two sources disagree, or a figure can't be confirmed, it isn't published until the question is settled. If a figure that is already live comes into doubt, the page says so plainly — naming both figures — until it is resolved.

Calculators are tested against known answers

Each calculator's math has automated tests that check it against known answers — standard reference values and published examples. The finance, tax and health pages explain their method, and most include a worked example you can check by hand. The tests run automatically on every change to the site, so a change that breaks the math can't be published.

Data has an expiry date

Tax years end and limits change. Each year's data carries the date it stops being valid, and our automated checks fail once that date passes — so stale figures get updated instead of quietly staying live.

How pages are made, and who signs off

The code and text of this site are drafted with AI assistance (Anthropic's Claude). Nothing is published on that basis alone: every change goes through the checks above, and Aqil Abbas Khan, Founder & Editor of ToolsNexus, approves each change before it goes live and signs off on the figures on finance, tax and legal pages.

That sign-off currently covers:

On the 2 health calculators, what is checked is the formula and the published cut-offs it uses — not clinical judgement. Other tools (word games, converters and the like) are maintained and tested by ToolsNexus, and labelled that way.

What review is not

Aqil Abbas Khan is not a CPA, an Enrolled Agent or an attorney, and nothing here is personal financial, tax, legal or medical advice. The pages are educational: they show how a figure is worked out so you can understand it and check it. For a decision that depends on your own situation, talk to a qualified professional.

Corrections

Spotted a number that looks wrong? Email contact@toolsnexus.online with the page's address and the inputs you used. Reports of wrong figures come first; a confirmed error is fixed, and the page's last-updated date moves with the fix.