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You get a Unique Taxpayer Reference (UTR) when you:
It’s a 10-digit number. It might just be called ‘tax reference’.
You’ll get your UTR by post 10 days after you register. You can usually see it sooner in your Personal Tax Account or the HMRC app.
This guide is also available in Welsh (Cymraeg).
You can find your UTR number:
If you cannot find your UTR on any documents or online, request it by calling the Self Assessment helpline. They’ll post it to you - this takes around 10 days.
If you have a limited company, you can request your Corporation Tax UTR online. HMRC will send it to the business address that’s registered with Companies House.
Don’t include personal or financial information like your National Insurance number or credit card details.
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