Becoming a sole trader in the UK is straightforward, but it’s an important legal step that makes your business official. Registering means you can start paying the right taxes and keep everything above board. It also shows you’re serious about your business, something that can be useful when talking to clients, banks, or even applying for loans later on.
Registering
To become a sole trader in the UK, you need to register for Self-Assessment so you can pay your own taxes.
How to do it:
- Go to gov.uk
- Choose “I’m registering as a sole trader”
- Fill in the information (Name, address, national insurance number. Etc)
- Done!
Why this matters: Without registering, you won’t be able to pay your taxes properly, and you could get fined by HMRC. Registering also gives you access to your Unique Taxpayer Reference (UTR), which you’ll need for all things tax-related.
What’s a Tax Year (and Why Should You Care).
A tax year is just the 12-month period the government uses to keep track of your income and figure out how much tax you need to pay. It’s kind of like the school year for grown-up money stuff and it doesn’t match the calendar year.
Here’s what that looks like:
- The 2024/25 tax year goes from 6 April 2024 to 5 April 2025
- The 2025/26 tax year runs from 6 April 2025 to 5 April 2026
It sounds a bit official, but don’t worry — once you know what tax year, you’re in, the rest is just following simple steps (and we’ll guide you through them).
Taxes ID (HMRC)
After you’ve registered, you will need to submit Self Assessment tax returns.
Once you register, HMRC will send you a Unique Taxpayer Reference (UTR) by post. This is your personal tax id, it’s what HMRC uses to track your self-employment income. This is a 10-digit number that’s completely unique to you, kind of like a student ID number, but for your taxes. It’s how HMRC knows who you are when you file your Self Assessment tax returns.
Keep your UTR safe, because you’ll need it when you:
- Submit your yearly tax return
- Talk to HMRC
- Apply for a mortgage, loan, or business account
It usually arrives within 10 days of registering, so watch your letterbox.
Keep it safe:
- Store your UTR securely, just like you would your National Insurance number
- Don’t share it publicly (it’s private to you and your tax records).
- If you lose it, you can request a reminder through your HMRC online account or by contacting them.