How to Register as a Sole Trader with HMRC

A calm walkthrough of registering as a sole trader: what you need to have ready, what HMRC sends you, and the mistakes that cause delays.

Registering as a sole trader is mostly an online form and a bit of waiting. The part that catches people out is the waiting: HMRC sends details by post or through your online account, and nothing about the process is instant. If you start early, it is a non-event. If you leave it, you can find yourself working for months without the login you need.

This is a general guide to the process, not tax advice. Rules and deadlines change, so confirm everything on gov.uk before you act.

What registering actually does

When you register, HMRC records that you are in business for yourself and enrols you for Self Assessment. That is the system you use to report your income and expenses each tax year and to pay the tax and National Insurance that results.

You will usually be given a Unique Taxpayer Reference (often called a UTR), a ten-digit number that identifies you to HMRC, and access to an online account where you file and see what you owe. Keep the UTR somewhere safe and avoid sharing it in messages or on forms that do not need it.

Before you start: have these ready

Gather the following so you can complete the form in one sitting:

Your full name, address and date of birth
Your National Insurance number
The date you started or will start trading
A description of the work you do, in plain words ("domestic cleaning" or "handyman services")
Your business address, which can be your home address
Contact details for HMRC to use

If you have used Government Gateway before, for example for a previous job or tax credits, have that user ID to hand. Otherwise you will create one during the process.

The usual steps

Go to the "Register for Self Assessment" page on gov.uk, not to a third-party site. Be wary of paid services that sit between you and HMRC; registering is free.
Choose the option for sole traders (self-employed individuals), not partnerships or companies.
Sign in or create your Government Gateway account.
Fill in your personal and business details.
Submit, and note down any reference you are given.
Wait for your UTR and activation details, which HMRC typically sends by post. Allow plenty of time, and do not assume it will arrive within days.
Activate your online account when the code arrives. Codes can expire, so do this promptly.

When to register

The deadline is generally tied to the tax year in which you started trading, and missing it can lead to penalties. Because the exact date depends on when you began, check the current dates on gov.uk rather than relying on a figure you heard from a friend.

If you are unsure whether what you are doing counts as trading, or whether you can rely on the trading allowance instead, read our explainer on the trading allowance and, if still unsure, ask HMRC or an accountant.

What to do right after registering

Registration is the start, not the finish. Set yourself up so the first Self Assessment is painless:

Open a business bank account or at least a separate account for trading money. See separating business and personal finances.
Start keeping records on day one. Our guide to record keeping shows a simple system.
Diarise key dates. Our overview of Self Assessment for new sole traders covers the rhythm of the year in general terms.
Learn about National Insurance. See National Insurance for the self-employed.

Choosing your business name

As a sole trader you can trade under your own name or a business name. A trading name has some rules: for example, it generally cannot be misleading or imply a larger organisation than you are, and it should not contain certain sensitive words without permission. Check the current guidance on gov.uk before printing vans, uniforms or business cards.

Registering a trading name is not the same as registering a company, and it does not give you exclusive rights to the name. If a brand name matters to you, search for similar names in your area first.

Common problems and fixes

Details do not arrive. If your UTR or activation code has not turned up after the period gov.uk suggests, contact HMRC through the official channels.
Name mismatch. Use your name exactly as it appears on official documents.
Using a paid middleman by mistake. Check the web address ends in gov.uk.
Starting work and forgetting. Put a reminder in your diary for a fortnight after you register to chase anything outstanding.

Frequently asked questions

Does it cost anything to register as a sole trader?

Registering for Self Assessment with HMRC is free. You may pay for optional extras such as an accountant, accounting software or business insurance, but none of those is required to register.

Do I need a separate business address?

No. Many sole traders use their home address. If privacy is a concern, think about whether you want that address shared publicly and check the options on gov.uk.

What if I stop trading later?

You should tell HMRC so your Self Assessment record is updated, and you may still need to file a return for the final period. Check the current process on gov.uk when the time comes.

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Related guides

Self Assessment for New Sole Traders: The Year Explained — A beginner's overview of how the Self Assessment year works, what the key stages look like and how to avoid a last-minute scramble.
Starter Tool Kit for a New Handyman: What to Buy First — A practical, staged shopping list of tools and equipment for a new handyman, with advice on what to buy, what to hire and what can wait.
Trade Certifications and Registrations You May Need — Which jobs legally need a registered or qualified person, such as gas and some electrical work, and how to check before you list a service.
Seasonal Demand Planning for Local Service Providers — Plan for busy and quiet periods across the year so you can price, schedule and save accordingly, whether you clean, garden, decorate or move.
Setting Your Service Area and Radius for Local Jobs — How to choose a service radius that keeps travel costs under control, fills your diary and matches how far customers will realistically book.