Where do I find my accounts office reference number (AORN)?
Your unique 13-character accounts office reference number (AORN) can be found on
- the letter HMRC sent you when you first registered as an employer
- the front of your payment booklet or the letter from HMRC that replaced it
You can use your accounts office reference number along with your PAYE reference to find out your letter code.
Keep your letter code handy as you will need it along with your PAYE reference when you log in to our secure websites.