How we check our figures in United Kingdom
Last updated: October 2026
Every rate, threshold and allowance in our United Kingdom calculators is read from the public body that sets it — never from another calculator or a news summary. Each figure lives in one versioned data file with a note of where and when it was read, and the calculator page shows the same sources and date you see below. Arnold Gold, our Product Manager, reviews each calculator against those sources before it goes live.
Calculators and their sources
| Calculator | Sources | Tax year | Last checked |
|---|---|---|---|
| Salary & Take-Home Pay Calculator | HMRC, Scottish Government | 2026/27 | 2 Sept 2026 |
| Stamp Duty Calculator | HMRC, Revenue Scotland, Welsh Revenue Authority | — | 2 Sept 2026 |
| VAT Calculator | HMRC | — | Date not recorded |
| Dividend Tax & Salary Split Calculator | HMRC | 2026/27 | 25 Sept 2026 |
| Capital Gains Tax Calculator | HMRC | 2026/27 | 25 Sept 2026 |
| Pension Tax Relief Calculator | HMRC | 2026/27 | 25 Sept 2026 |
| Council Tax Calculator | MHCLG | 2026/27 | 25 Sept 2026 |
Where a row says date not recorded, our data file names the source but not the day it was read, so we don't print one. Those figures are next in line for a dated re-check.
How often we re-check
The UK tax year runs from 6 April to 5 April. We re-check every UK calculator when new rates take effect each April, and whenever HMRC or the devolved governments announce a change.
What the calculators don't do
They give estimates from the general rules. They don't know your full circumstances — other income, reliefs you're entitled to, or decisions only a tax authority or adviser can make — and they are not financial, tax or legal advice. Each page says what it leaves out.
Spotted an error?
Tell us at hello@toolhose.org with the page and the source you're looking at. We check every report against the official source, fix confirmed errors, and update the page's check date.