Banking

Registering as Self-Employed UK — Step-by-Step Guide

How to register as self-employed with HMRC. Deadlines, what you need, UTR numbers, National Insurance, and everything to get started legally.

· 4 min read

Registering as self-employed is the crucial first step when starting to work for yourself. It is free, straightforward, and ensures you are legally compliant with HMRC from day one.

Who Needs to Register?

Situation Need to Register?
Selling products or services regularly Yes
Freelancing for clients Yes
Running any kind of business Yes
Trading income over £1,000/year Yes
Earning under £1,000/year (Trading Allowance) No
Running a limited company Register the company (different process)
Landlord with rental income over £1,000 Yes (Self Assessment required)

How to Register: Step by Step

Step Action Detail
1 Create a Government Gateway account If you do not already have one
2 Register for Self Assessment Online at gov.uk
3 Provide your details NI number, name, address, date of birth
4 Provide business details Business name, type, start date
5 Receive your UTR By post within 10 working days
6 Receive activation code For online access (separate letter)
7 Activate your online account Using the code
8 File your first tax return By 31 January after the tax year

What You Will Need

Information Detail
National Insurance number On payslips, P60, or HMRC letters
Full name and address Current address
Date of birth —
Phone number and email For HMRC contact
Business name Or your own name if trading as yourself
Business address Can be your home address
Nature of business What your business does
Business start date When you started trading

After Registration

What You Must Do

Obligation Detail
Keep records All income and expenses for 5 years
File Self Assessment By 31 January (online) or 31 October (paper)
Pay Income Tax By 31 January + 31 July (payments on account)
Pay National Insurance Calculated on your tax return
Register for VAT If turnover exceeds £90,000
Meet MTD requirements Digital records required from April 2026 (income over £50,000)

Key Deadlines

Date What
5 October Deadline to register for Self Assessment (in your second tax year)
31 October Paper tax return deadline
31 January Online tax return + first tax payment deadline
31 July Second payment on account

Example Timeline

Event Date
Start self-employment June 2025
Register with HMRC June 2025 (best) or by 5 October 2026 (deadline)
First tax year ends 5 April 2026
File first tax return By 31 January 2027
Pay tax owed By 31 January 2027

Registering for Class 2 National Insurance

When you register for Self Assessment, you are automatically registered for Class 2 NI:

NI Class Rate (2025/26) When Payable
Class 2 £3.45/week Profits over £12,570
Class 4 6% on £12,570–£50,270 On profits in this band
Class 4 (upper) 2% above £50,270 On profits above this

Class 2 NI counts towards your State Pension entitlement — so it is worth paying even if technically voluntary at lower profit levels.

Trading Allowance

Detail Amount
Allowance £1,000/year
What it covers Self-employed income below this threshold
Tax return required? No (if total self-employment income is under £1,000)
Can you still register? Yes (useful if you want to pay voluntary NI contributions)

Business Structure Choice

Structure Register With Pros Cons
Sole trader HMRC (Self Assessment) Simple, free, private Unlimited liability
Partnership HMRC (SA for each partner) Shared workload Shared liability
Limited company Companies House + HMRC Limited liability, tax efficient More admin, public accounts

Additional Registrations

Registration When Required
VAT Turnover exceeds £90,000 (or voluntary)
Employer (PAYE) When you hire employees
Construction Industry Scheme (CIS) Working in construction
Data Protection (ICO) Processing personal data
Local authority licences Depending on trade (food, taxi, etc.)

Common Mistakes

Mistake Consequence
Not registering at all Penalties + interest on unpaid tax
Registering late Potential £100 penalty
Not keeping records Difficulty completing tax return, potential HMRC investigation
Mixing personal and business finances Messy records, accounting costs
Not saving for tax January shock — cannot pay the bill
Forgetting payments on account Late payment penalties

Tips for New Self-Employed Workers

  1. Register immediately — don’t wait for the deadline
  2. Open a business bank account — separate your finances
  3. Start using accounting software — from day one
  4. Save 25–30% of income for tax from the start
  5. Get business insurance if needed
  6. Consider an accountant — saves time and often saves tax
  7. Build an emergency fund — there is no employer safety net

For detailed tax information, see our self-assessment guide and tax allowances guide.