How to check your tax code

Step by step

1. 1

   Step 1: Find your tax code

   Your tax code is on your payslip, on a Tax Code Notice letter from HMRC, in your online HMRC account, or in the HMRC app. You have a separate code for each job or pension.

   Next: step 2
2. 2

   Step 2: Understand the number

   The number is your tax-free income with the last digit removed. The standard Personal Allowance is £12,570, so most people with one job have the code 1257L. Benefits like a company car or medical insurance reduce the number.

   Next: step 3
3. 3

   Step 3: Understand the letters

   Common letters:

   • L – standard Personal Allowance
   • M / N – Marriage Allowance (received / transferred)
   • T – other calculations are needed
   • 0T – no allowance, often a new job without details
   • BR / D0 / D1 – all income taxed at basic, higher or additional rate (usually a second job)
   • NT – no tax
   • K – untaxed income is more than your allowance
   • S or C at the start – Scottish or Welsh rates

   Emergency codes end in W1, M1 or X.

   Next: step 4
4. 4

   Step 4: Check it's right

   Sign in to GOV.UK > Check your Income Tax for the current year to see your code, estimated income and expected tax.

   Next: step 5
5. 5

   Step 5: Fix it if it's wrong

   Use the same online service or HMRC app to update your income, employer details or benefits, or contact HMRC. Your employer can't change your code themselves – HMRC sends them a new one.

   Next: step 6
6. 6

   Step 6: Get back any overpayment

   If you've paid too much, HMRC usually corrects it through your code or sends a refund after the tax year ends.