Updating Your Tax Code

You may be put on an emergency tax code if you change jobs. HM Revenue and Customs (HMRC) will correct it automatically after you’ve given your employer details of your previous income or pension.

Your employer will get these details from your P45 – if you don’t have one, they should ask you for further information.

HMRC will also update your tax code when:

After your tax code changes

HMRC will adjust your tax code so you pay the right amount of tax across the year. They’ll write to you or email you when your tax code has been updated.

They will also tell your employer or pension provider that your tax code has changed. Your next payslip should show:

  • your new tax code
  • adjustments to your pay if you were paying the wrong amount of tax

Find out more here