How to Register as Self-Employed in the UK: A Step-by-Step Guide

Registering as self-employed is one of those things that sounds more complicated than it actually is. Once you know the steps, the whole process takes less than 20 minutes online — and HMRC makes it straightforward.

I’m Anita — a Chartered Accountant who went self-employed myself. This guide breaks it all down clearly so you can get it done quickly, get your records set up properly from day one, and get on with running your business.

Do You Need to Register as Self-Employed?

Before you register, it’s worth understanding the rule that determines whether you need to.

The £1,000 Trading Income Allowance

If you earn £1,000 or less from self-employment in a tax year, you may not need to register with HMRC or file a Self Assessment tax return – this is covered by the trading income allowance.

It’s a useful buffer if you’re testing a business idea or earning from a small side hustle. One thing worth knowing: if your business expenses are higher than £1,000, you may actually be better off registering and claiming those expenses instead (it could reduce your tax bill).

Once your income exceeds £1,000, registration is required.

Read => Self Assessment Tax Return for Sole Traders: A Step-by-Step Guide

When Is the Deadline to Register?

You must register with HMRC by 5 October following the end of the tax year in which you exceeded the £1,000 threshold.

The UK tax year runs from 6 April to 5 April each year.

Example: If you earned more than £1,000 during the tax year ending 5 April 2026, your registration deadline is 5 October 2026.

Don’t leave it to the deadline — register as soon as you start trading properly. There’s no benefit to waiting and it avoids any risk of a late registration penalty.

Read => Self Assessment Deadlines for Sole Traders: Key Dates 2026/27

How to Register as Self-Employed Online: Step by Step

Step 1: Get Your Information Together

Before you go to the HMRC website, have the following ready:

• Your National Insurance number
• Your personal details (name, address, date of birth)
• Your business start date — the date you first started trading or earning self-employed income
• A brief description of what your business does

Step 2: Go to the HMRC Website

Visit HMRC’s Self Assessment registration page and follow the steps to register. You’ll be creating a Government Gateway account if you don’t already have one, or logging into an existing one.

If you’ve been self-employed before and have an old account, you’ll have the option to reactivate it rather than starting from scratch.

Step 3: Complete the Registration Form

Follow the on-screen instructions to provide your personal and business details. It’s straightforward — HMRC has made this process much simpler in recent years.

Step 4: Receive Your UTR Number

Once registered, HMRC will send you a Unique Taxpayer Reference (UTR) — a 10-digit number that identifies you for tax purposes. Keep it safe; you’ll need it every time you file a tax return.

Once you’ve registered, HMRC will issue your 10-digit Unique Taxpayer Reference (UTR). If you use HMRC’s new online registration service, your UTR should appear in your online account within 72 hours.

Step 5: Set Up Your Records From Day One

This is the step most people skip — and it causes the most pain later. Start tracking your income and expenses from the moment you begin trading, not just from when you get your UTR.

Good record-keeping means your tax return is straightforward, you claim everything you’re entitled to, and you always know where your business stands financially.

Club deal: Members of The Self Employed Club get exclusive discounts on accounting software that makes record-keeping simple and keeps you MTD-ready. See the current deals →

What Taxes Will You Pay as a Sole Trader?

Once you’re registered, you’ll be responsible for three potential taxes:

Income Tax

Income Tax is charged on your taxable income, including your self-employed profits. The standard Personal Allowance for 2026/27 is £12,570, although how much tax you pay will depend on your total income and circumstances.

National Insurance Contributions (NICs)

• Class 4 NICs paid on profits between £12,570 and £50,270 at 6%, and above £50,270 at 2%
• Class 2 NICs most self-employed people no longer pay Class 2. If your profits are £7,105 or more in 2026/27, your contributions are treated as paid. If your profits are below this, you may be able to pay Class 2 voluntarily to protect your National Insurance record.

Read => Self-Employed Tax: How It Works and What You Need to Know

VAT

You don’t need to register for VAT just because you’re self-employed. You must usually register if your VAT taxable turnover goes over £90,000 in a rolling 12-month period. You’ll also need to register if you expect your taxable turnover to go over £90,000 in the next 30 days alone.

VAT taxable turnover is the total value of everything you sell that is not exempt from VAT.

If your turnover is below the threshold, you can still choose to register voluntarily (although whether that makes sense will depend on your business and customers).

If you’re getting close to the threshold, keep a close eye on your turnover because the test looks at a rolling 12-month period, not just your accounting year or the tax year.

Check the current VAT registration rules on GOV.UK >

What To Do After You’ve Registered

Open a Business Bank Account

You’re not legally required to have a separate business account as a sole trader — but it makes a real difference. Keeping your business and personal finances separate means cleaner records, easier tax returns, and a much clearer picture of how your business is actually doing.

There are some excellent free business bank accounts designed specifically for sole traders. The Self Employed Club has deals on business banking — worth checking before you open an account anywhere.

Get Your Accounting in Order

Whether you use accounting software or a spreadsheet, having a system in place from day one saves significant time and stress at tax return time. Making Tax Digital is now being phased in. It applies from April 2026 to qualifying sole traders and landlords with qualifying income over £50,000, reducing to over £30,000 from April 2027 and over £20,000 from April 2028.

Club deal: Get exclusive discounts on Xero and other accounting tools through The Self Employed Club →

Read => Making Tax Digital: What Sole Traders Need to Know

Understand What Expenses You Can Claim

One of the most valuable things you can do as a new sole trader is understand what business expenses you’re allowed to claim — things like equipment, software, travel, and home office costs. Every legitimate expense reduces your taxable profit and therefore your tax bill.

Read => Allowable Expenses for Sole Traders: The Full List

Mark Your Tax Deadlines

You’ll need to file a Self Assessment tax return every year. The key dates to put in your diary:

Missing these deadlines can result in penalties, so they’re worth putting in your diary now.

FAQs