If you’re working for yourself in the UK, whether as a CIS subcontractor, sole trader, or self-employed professional one of the first things you’ll need to sort out is your UTR number for Self Assessment. This 10-digit number is crucial for staying on the right side of HMRC, filing your taxes, and getting any tax refunds you’re owed.
In this post, we’ll walk you through what a UTR number is, why you need one, and the easiest ways to apply for one – even if it’s your first time.
What is a UTR number?
UTR stands for Unique Taxpayer Reference. It’s a 10-digit number issued by HMRC (Her Majesty’s Revenue & Customs) when you register for Self Assessment. It looks like: 12345 67890.
You’ll need this number whenever you:
- File your Self Assessment tax return
- Claim a CIS tax refund
- Speak to HMRC about your taxes
- Register or operate as a self-employed worker
Think of your UTR number as your personal tax ID.
Who needs a UTR number?
You’ll need a UTR number if you:
- Work under the CIS scheme (Construction Industry Scheme)
- Are a sole trader
- Run a small business
- Are a freelancer or self-employed professional
- Earn money outside PAYE (e.g., renting out property or selling online)
You won’t get a UTR number automatically you have to register for Self Assessment first.
When should you apply for a UTR number?
The earlier the better! Ideally, you should apply as soon as you start working for yourself or earning income that isn’t taxed through PAYE.
Here’s when to apply:
| Scenario | When to Apply for UTR |
| Starting as a sole trader | As soon as you start |
| Registering under the CIS scheme | Before your first job |
| Becoming self-employed | Within 3 months |
| Earning rental or freelance income | Before the next tax year ends |
If you leave it too late, you might miss important tax deadlines and risk penalties from HMRC.
How to Apply for a UTR Number
There are a few ways to register and get your UTR number:
Option 1: Online via HMRC
You can register directly on the HMRC website. You’ll need to create a Government Gateway account if you don’t already have one.
You’ll need:
- Your National Insurance number
- Your full name and address
- Your date of birth
- Details about your self-employment (e.g., trade, start date)
- Photo ID (UK passport or driving license)
- Proof of address (recent bank statement or utility bill within last 3 months)
Option 2: Let Tax2u Handle It For You
Want to avoid the hassle? Tax2u can register you for Self Assessment and handle everything from UTR application to your annual tax return.
Our experts specialise in helping:
- CIS workers
- Sole traders
- Self-employed individuals
Register with Tax2u to get started in minutes.
How Long Does It Take to Get a UTR Number?
Once you register, HMRC will post your UTR number to your address usually within 10 working days (or up to 21 days if you’re abroad).
While you’re waiting, make sure to:
- Keep an eye out for HMRC letters
- Set up your online HMRC account if you haven’t already
- Prepare your business records for tax time
Lost Your UTR Number?
If you’ve already registered but can’t find your UTR, don’t panic. You can usually find it on:
- Past tax returns
- HMRC letters (e.g., SA250 “Welcome to Self Assessment” letter)
- Your personal tax account online
Or you can contact HMRC directly to recover it.
Don’t Wait Until It’s Too Late
Without a UTR number, you can’t submit your Self Assessment return which could mean missed refunds or penalties of £100+. That’s the last thing anyone wants.
Ready to Get Your UTR Number?
Getting your UTR number for Self Assessment doesn’t have to be stressful. Whether you’re a CIS subcontractor, a new sole trader, or going self-employed for the first time – Tax2u is here to help.
We’ll handle the entire process for you and even complete your tax return, ensuring you claim back every penny you’re owed.
Start your registration with Tax2u and take the stress out of tax season.