Tax Code Checker calculator

Decode your HMRC tax code and personal allowance.

Tax Year

Enter Tax Code

Annual Salary (£)

Code Status

Standard personal allowance

Tax-Free Allowance

£12,570.00

Estimated Annual Tax

£7,286.00

National Insurance (Class 1)

£2,914.40

Annual Take-Home

£38,799.60

Monthly Take-Home

£3,233.30

How does the Tax Code Checker work?

Enter the tax code found on your payslip (e.g., 1257L).

The numbers indicate how much you can earn tax-free (multiply by 10).

The letter indicates your specific circumstances (L is standard, M/N for marriage allowance, etc.).

Compare this against your expected Personal Allowance.

Calculated instantly with up-to-date HMRC thresholds. Our engine ensures 100% accuracy for the current tax year.

Pro Tip: Keep your receipts!

PAYE Accuracy: Your tax code tells your employer how much tax to deduct each month.

Wrong Code: If your code is wrong, you might be overpaying or underpaying tax unexpectedly.

Emergency Codes: Codes like 'W1' or 'M1' are emergency codes and usually mean HMRC needs more info.