What does my tax code mean?

Your tax code tells your employer how much tax-free income you’re allowed before PAYE tax is deducted from your salary.

It’s issued by HMRC and appears on your payslip, P60, or tax notice.

If you’re unsure whether your code is correct, you can check it instantly using our tax code checker.

What a UK Tax Code Actually Does

A tax code determines:

Your employer uses this code to calculate tax automatically.

The numbers usually represent your tax-free allowance.

For example:

If your number is lower than 1257, it usually means HMRC has made an adjustment.

You can check what your specific code means using our tax code checker tool here:
https://www.treggenaltd.co.uk/tax-code-checker

HMRC may adjust your code for:

Sometimes codes change automatically — and errors do happen.

Warning signs include:

If your code looks unusual, it’s worth checking.

You can verify it in seconds with our free tax code checker:
https://www.treggenaltd.co.uk/tax-code-checker

If your tax code is wrong:

Incorrect codes can mean overpaying or underpaying tax.

If you want to understand exactly what your tax code means — and whether it’s correct — you can use our free tool here:

It explains your code clearly and flags potential issues.