For your business5 min read

How to register as self-employed in the UK (2026 guide)

Registering as self-employed in the UK takes 10 minutes online — but the process is buried under HMRC jargon. Here's exactly what to do, in plain English.

Quick answer

Register as self-employed online with HMRC at gov.uk/register-for-self-assessment. The process takes 10 minutes and is free. You must register by 5 October of the second tax year you're self-employed (e.g., self-employed in 2026/27 → register by 5 October 2027). After registering, HMRC sends you a Unique Taxpayer Reference (UTR) and you submit Self Assessment tax returns annually by 31 January.

Step-by-step

Decide if you actually need to register

You must register as self-employed (sole trader) if you're earning more than £1,000 of self-employed income in a tax year (April 6–April 5). Below £1,000, the 'Trading Allowance' covers it — you don't need to register or report it. Above £1,000, registration and an annual Self Assessment are required. If you're already a director of a limited company, you may still need to register for Self Assessment for personal income alongside your salary; this guide focuses on sole trader registration.

Gather what you need before starting

Two things needed for registration. Your National Insurance number (find it on payslips, P60, or via gov.uk/find-your-national-insurance-number). A Government Gateway user ID and password (create one at gov.uk/log-in-register-hmrc-online-services — takes 5 minutes). If you've previously filed Self Assessment for any reason (rental income, etc.), you already have a UTR and Government Gateway — log in with those.

Register online at gov.uk

Go to gov.uk/register-for-self-assessment and select 'You're self-employed (sole trader)'. The form asks: your personal details, when you started self-employment, your trading name (your own name is fine), nature of your business (a few words describing what you do). Submit. HMRC processes this within 1–2 weeks and posts your Unique Taxpayer Reference (UTR) — a 10-digit number — to your home address. You'll need this UTR to file your Self Assessment.

Know your registration deadline

Critical date: you must register by 5 October of the second tax year of self-employment. Example: if you started self-employment in May 2026 (tax year 2026/27), you must register by 5 October 2027. Missing this deadline triggers HMRC penalties starting at £100 plus daily charges. Most penalties happen because people don't realise the deadline — register as soon as you decide to be self-employed, not at the deadline.

Set up your tax-savings system

Self-employed income is paid gross — HMRC doesn't take tax at source. You owe Income Tax and Class 4 National Insurance on your profit (income minus expenses). Standard advice: save 25–30% of your income in a separate savings account, ringfenced for tax. The most common new-self-employed disaster is owing £6,000 in tax and not having it. Start the savings habit from your first invoice; it's far easier than scrambling at 31 January.

Open a separate business bank account

Not legally required as a sole trader (you can use your personal account), but practically essential. A separate account keeps business and personal transactions clean for tax purposes, dramatically simplifies your annual accounts, and signals professionalism to clients receiving bank-transfer payments. Mettle (NatWest) is free with full features and unlocks FreeAgent accounting software free; Starling, Tide, and Monzo Business are also strong options.

Plan for your first Self Assessment

You'll file a Self Assessment tax return annually, due 31 January for the tax year that ended the previous 5 April. Example: tax year 2026/27 (6 April 2026 to 5 April 2027) → file by 31 January 2028. You can file yourself online (free) at gov.uk/self-assessment-tax-returns, or pay an accountant (typically £200–£600/year for sole traders). Either way: don't leave it until January — start gathering records from your first month of trading.

Tips & best practices

▸Register the moment you decide to be self-employed, not at the deadline. HMRC penalties for late registration start at £100 and climb fast.
▸Open a Mettle business account — it's free, takes 10 minutes, and unlocks FreeAgent accounting software completely free, which handles invoicing, expenses, and your Self Assessment.
▸Keep digital copies of every receipt and invoice. HMRC requires records for 5 years from the 31 January filing deadline; cardboard-box record keeping costs more than any accounting software does.

Common questions

How long does it take to register as self-employed in the UK?

Online registration takes 10 minutes. HMRC processes the registration within 1–2 weeks and posts your UTR by mail. You can usually start trading and invoicing immediately — you don't need to wait for the UTR to begin.

Do I need to register if I only earn a few hundred pounds?

No. The £1,000 Trading Allowance covers self-employed income up to £1,000 per tax year — you don't need to register or report it. Above £1,000, registration is required.

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

Yes — many people are both. You'll pay PAYE on your employed salary (handled by your employer) and Self Assessment on your self-employed income. Just make sure your Self Assessment captures both income types when you file.

What's the biggest mistake new self-employed people make?

Not saving for tax. Self-employed income is paid gross; you owe tax on the profit. Save 25–30% from day one and the January deadline becomes admin instead of crisis.