Who writes the tools
Ellis Rowan, editor
Ellis Rowan is the pen name of the editor who runs PaySums. Ellis writes and updates the tax, pay and pension calculators, re-checks every rate against HMRC and GOV.UK each April and whenever a rate changes mid-year, and answers emails about wrong figures.
Ellis isn't a qualified accountant or tax adviser, and nothing on PaySums is financial advice.
How the figures are checked
Every rate lives in one file with a link to the official page it came from. When HMRC, the Scottish Government or NHS Employers publish new figures, the file is updated, each calculator is tested against HMRC's published examples, and the "last checked" date on every tool moves on.
Found a figure that looks wrong? Tell us and we'll check it against the source.