Find a lost UTR number

You will automatically be sent a unique taxpayer reference (UTR) when you:

register for self assessment
set up a limited company

It is a ten-digit number. It might just be called tax reference.

Where to find your UTR

Your UTR is on previous tax returns and other documents from HMRC, for example:

notices to file a return
payment reminders

You can also find your UTR in your HMRC online account (external link)

If you cannot find your UTR

You can access your UTR instantly by downloading the HMRC app (external link) or logging onto your Personal Tax Account (external link). HMRC have produced a YouTube Video (external link) to show just how easy it is to find your UTR using the app.

Alternatively call the self assessment helpline to request your UTR (external link) if you cannot find any documents from HMRC. Please note for security reasons, HMRC cannot give your UTR out over the phone so it will take 10 to 15 days to arrive in the post.

If you have limited company, you can request your corporation tax UTR online (external link). HMRC will send it to the business address that is registered with Companies House.