TruePay UK vs HMRC's tax calculator
HMRC's estimator is the official source of truth for UK income tax — so let's be clear up front about where it wins and where a tool like ours adds something.
What HMRC's tax calculator is
HMRC's “Estimate your Income Tax” tool on gov.uk is the government's own calculator. It's authoritative, free, and the closest thing to a definitive answer for a straightforward employee — if it and any other calculator disagree, HMRC is right.
What it deliberately keeps simple: it focuses on income tax for a single employment, with a plain interface and limited handling of pensions, Scottish detail, self-employment or the reasons behind the numbers.
Side by side
| HMRC's tax calculator | TruePay UK | |
|---|---|---|
| Official / authoritative | Yes — the definitive source | Cited to gov.uk, aims to match HMRC to £1 |
| Income tax + National Insurance | Income tax focus | Both, broken down band by band |
| Pension scheme types | Limited | Net pay, relief at source, salary sacrifice |
| Scottish six bands shown clearly | Applied, not explained | Yes, with the England difference in £ |
| Self-employed | No | Yes — Class 2 & 4, payments on account |
| Payslip-style breakdown & guides | No | Yes |
| Design and clarity | Functional | Built for 2026 |
When to use HMRC's tax calculator
- You want the single most authoritative figure and nothing else.
- You're checking a disputed number — HMRC's estimator settles it.
- You need to sign in to your personal tax account to see your real code.
When to use TruePay UK
- You want tax and NI together, with a clear breakdown of each band.
- You have a pension and need the right scheme modelled (and the NI saving shown).
- You're self-employed, in Scotland, on a K code, or want to understand the number, not just see it.
We think tools like HMRC's tax calculator are worth having — this isn’t about knocking them. Try HMRC's tax calculator for yourself, then run the same numbers through ours and see which fits how you like to work.
See your take-home in TruePay UK
Full breakdown, the right pension scheme, Scottish bands and every rate cited to gov.uk — in a few seconds.
Open the calculator