When do I need to register as self-employed with HMRC?

You must register with HMRC by 5 October in your business's second tax year. For example, if you started freelancing in June 2025 (tax year 2025/26), you must register by 5 October 2026. However, it's better to register as soon as you start — there's no penalty for registering early, but late registration can result in fines.

How long does it take to get a UTR number?

After registering for Self Assessment, HMRC sends your Unique Taxpayer Reference (UTR) by post. This typically takes 10 working days if you're in the UK, or 21 working days if you're abroad. You can't speed this up — it must be sent by post for security reasons. Your UTR is a 10-digit number you'll use for all tax returns.

Can I be self-employed and employed at the same time in the UK?

Yes, absolutely. Many people have a regular PAYE job while also doing freelance work on the side. You'll pay tax through PAYE on your employment income and file a Self Assessment tax return for your self-employment income. Your personal allowance will usually be applied to your employment income first. You'll pay Income Tax on your self-employed profit on top of your employment tax.

Guide · February 2026 · 10 min read

How to Register as Self-Employed in the UK (Step-by-Step 2026 Guide)

Starting your freelance career? You need to register with HMRC. Here's exactly how to do it — from start to finish, including the bits nobody tells you about.

Do I Actually Need to Register?

You must register as self-employed with HMRC if:

You earned more than £1,000 from self-employment in a tax year (6 April to 5 April)
OR you want to pay voluntary Class 2 National Insurance (to protect your state pension)
OR you need to prove your self-employed status (for mortgages, visas, etc.)

💡 The £1,000 trading allowance: If your total self-employment income is under £1,000/year, you don't legally need to register or report it. This is handy for very casual side gigs. But the moment you cross £1,000, you need to register.

You do not need to register if:

You only earn income through PAYE employment
Your self-employment income is under £1,000 and you don't want to pay voluntary NI
You're selling personal possessions (not trading)

When to Register (and the Deadline)

The official deadline is 5 October in your business's second tax year.

In practice, this means:

Started freelancing in September 2025 (tax year 2025/26)? Register by 5 October 2026.
Started in April 2026 (tax year 2026/27)? Register by 5 October 2027.

            Our advice: Register immediately. There's zero penalty for registering early, but a £100+ fine for registering late. Plus, you need your UTR number before you can file a tax return, and it takes 10 working days to arrive. Don't get caught out.
        

What You'll Need

Before you start, gather:

Your National Insurance number (on your payslip, P60, or HMRC letters)
Your date of birth
Your contact details (address, email, phone)
The date you started self-employment (or plan to)
Your business name (if different from your own name)
Your business type/description (e.g., "graphic designer", "web developer")
Your business address (can be your home address)

Step-by-Step Registration

Go to HMRC's Registration Page

Visit gov.uk/register-for-self-assessment/self-employed. This is the official starting point. Don't use any third-party "registration service" that charges a fee — HMRC registration is completely free.

Create or Sign In to Government Gateway

You'll need a Government Gateway account. If you don't have one, you can create it during registration. You'll set up a user ID and password — save these somewhere safe, you'll need them every time you interact with HMRC online.

You may need to verify your identity. HMRC accepts: passport, driving licence, or payslip/P60 details.

Complete the Registration Form

The online form asks for:

Your personal details and NI number
Date your business started (the date you first did paid work or actively sought work)
Business name and type
Business address
Business phone number and email

The whole form takes about 10-15 minutes.

Submit and Wait for Your UTR

After submitting, HMRC will send your Unique Taxpayer Reference (UTR) by post. This is a 10-digit number unique to you. It typically arrives within 10 working days (21 days if abroad).

You'll also be automatically registered for Class 2 National Insurance.

Activate Your Online Account

Once you have your UTR, you can access HMRC's online services. You'll also receive a separate activation code by post. Use this to fully activate your Self Assessment account online.

From here, you can file tax returns, check deadlines, and manage your tax affairs online.

⏱️ Timeline summary: Registration takes 10-15 minutes online. UTR arrives in ~10 working days. Activation code in another ~7 days. Allow 3-4 weeks total from registration to fully functional account. Start early.

What Happens After You Register

Once registered, you're committed to:

Filing a Self Assessment tax return every year (by 31 January for online, 31 October for paper)
Paying Income Tax on your profits (by 31 January, with payments on account in July)
Paying National Insurance — Class 2 (flat rate, ~£3.45/week) and Class 4 (percentage of profits)
Keeping records of all income and expenses for at least 5 years after the filing deadline
Making Tax Digital (MTD) — From April 2026, self-employed people earning over £50,000 must use MTD-compatible software for quarterly updates

Can I Be Employed and Self-Employed at the Same Time?

Yes, absolutely. This is extremely common. Many freelancers start while keeping a day job. Here's how it works:

Your employer deducts tax through PAYE as normal
You file a Self Assessment return for your self-employment income
HMRC calculates your total tax across both incomes
Your personal allowance (£12,570) is usually applied to your employment income first
You pay any additional tax on your self-employment profits

            Example: You earn £35,000 from employment and £15,000 from freelancing. Your personal allowance covers the first £12,570 of employment income. The remaining employment income is taxed through PAYE. Your £15,000 freelance profit is taxed at your marginal rate — likely 20% basic rate, so approximately £3,000 in tax, plus National Insurance.
        

Common Registration Mistakes

Registering too late: Late registration can mean penalties. Register as soon as you start freelancing.
Wrong start date: HMRC considers your start date as when you first did paid work, started marketing, or actively sought work — not when you registered.
Losing your Government Gateway details: Store your user ID, password, and UTR securely. Recovering them is painful and slow.
Not separating business and personal finances: Open a separate bank account from day one. It makes bookkeeping infinitely easier. See our guide to business bank accounts for freelancers.
Forgetting about NI: Registration automatically signs you up for Class 2 NI. Budget for Class 4 NI too — it comes with your tax bill.
Not tracking expenses from day one: Every business expense you don't track is tax relief you lose. Start a simple spreadsheet or use accounting software immediately.

Your First 30 Days: Essential Tasks

Register with HMRC (you've just learned how ✅)
Open a business bank account — Free options include Starling, Tide, and Mettle. See our comparison.
Set up expense tracking — Even a spreadsheet works. Bookkeeping basics guide.
Create an invoice template — Use our free invoice generator or download our free template.
Set aside 25-30% of income for tax — Every time you get paid, move this to a separate savings account.
Consider insurance — Professional indemnity and public liability are worth investigating.
Write a basic contract template — Never start work without one. Contract writing guide.
Understand your tax deductions — Every expense you can claim.

Starting Out? Get Everything You Need

Our Getting-Paid Toolkit includes 37 email templates, contract clauses, and onboarding systems — perfect for new freelancers who want to look professional from day one.

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