What Is a UTR Number and How Do You Get One?

Quick answer:

A UTR (Unique Taxpayer Reference) is a 10-digit number HMRC issues to identify you for Self Assessment and tax purposes, you get one automatically when you register as self-employed or for Self Assessment, it arrives by post within about 10 working days, and you’ll need it to file tax returns and to use Making Tax Digital.

If you’re newly self-employed, the UTR is one of the first things you’ll encounter. Here’s everything you need to know.

What is a UTR number for?

Your UTR identifies you to HMRC for all things tax, filing Self Assessment, dealing with payments, and operating under Making Tax Digital. It’s unique to you and stays the same for life. Think of it as your personal reference in the tax system.

How do you get a UTR number?

You get a UTR automatically when you register for Self Assessment as self-employed. There’s no separate application, registering triggers it. See the full process in how to register as a sole trader with HMRC. After registering, HMRC posts your UTR, typically within around 10 working days.

Where do you find your UTR?

If you already have one, your UTR appears on:

Previous Self Assessment tax returns
HMRC letters and your online tax account
Your “welcome to Self Assessment” letter
Payment reminders and statements from HMRC

Why do you need a UTR for MTD?

Making Tax Digital uses your existing Self Assessment identity, so your UTR is part of how you’re recognised when keeping digital records and filing quarterly. If you’re getting set up for MTD, have your UTR to hand, see how to sign up for MTD income tax.

What if you’ve lost your UTR?

You can recover it from your HMRC online account, a previous return, or by contacting HMRC. You don’t get a new one, it’s permanent.

How CleanBooks AI fits in

Once you’re registered and have your UTR, CleanBooks AI helps you do everything that comes next: connect your bank, let Keeva™ categorise, keep digital records and file your MTD updates. It’s the simplest way to put your new tax registration to work, see bookkeeping for freelancers.

Newly registered? Get organised now. Try CleanBooks AI free, 6 months free, no credit card.

Frequently asked questions

What is a UTR number?

A UTR (Unique Taxpayer Reference) is a 10-digit number HMRC uses to identify you for Self Assessment and tax purposes. It’s unique to you, permanent, and required to file tax returns and use Making Tax Digital.

How do I get a UTR number?

You get a UTR automatically when you register for Self Assessment as self-employed, there’s no separate application. HMRC posts it to you, usually within about 10 working days of registering.

Where can I find my UTR number?

Your UTR appears on previous Self Assessment returns, HMRC letters, your online tax account, and your welcome-to-Self-Assessment letter. If you’ve lost it, you can recover it from your HMRC account or by contacting HMRC.

Do I need a UTR for Making Tax Digital?

Yes. MTD uses your existing Self Assessment identity, so your UTR is part of how HMRC recognises you when you keep digital records and file quarterly updates. Have it ready when signing up.