Last reviewed January 2023

A tax code is a string of numbers and letters that tells your employer how your earnings should be taxed. You get one for each Pay As You Earn (PAYE) job you have, and it’s important to keep track of them. Any time your tax code changes, HMRC will alter the Income Tax you’re paying each year.

If you’ve got an NT tax code for your job, you’re in a pretty unusual position. The NT code actually means that you aren’t paying Income Tax at all on your earnings from this job!

There are actually quite a few reasons why you might get an NT tax code. For example:

  • You might be a non-UK resident for tax purposes, residing in a country that operates a “double taxation” agreement with the UK.
  • You might be reporting this income to HMRC some other way, perhaps along with self-employment earnings.
  • You might work in film or TV, and be allowed to get paid for up to 6 days of work without paying tax.
  • You might be given an NT tax code temporarily if you’re working while bankrupt.

Keep in mind that having an NT tax code only lets you off the hook for Income Tax. You could still have to pay National Insurance Contributions (NICs) out of your earnings.