How to Become Self-Employed in the UK (2026 Guide)

Are you self-employed?

You are generally self-employed if you run your own business and take responsibility for whether it succeeds: you decide how, when and where you work, you can have several clients, you set your prices and you can make a loss. Freelancers, contractors working as sole traders and most tradespeople who invoice for their work are self-employed.

Employment status is decided by the facts, not the label you or a client use. If you are unsure, GOV.UK explains the tests and HMRC's Check Employment Status for Tax (CEST) tool can help.

Many people start as sole traders. Others set up a limited company. The choice affects tax, paperwork and liability, so read our guide to limited company vs sole trader and talk to an accountant if you are unsure.

Register with HMRC

The trading allowance lets you earn up to £1,000 a tax year from self-employment without paying tax or telling HMRC about it. Above that, you need to register for Self Assessment. You may also choose to register below it, for example to pay voluntary National Insurance.

Register by 5 October after the end of the tax year in which you started. The UK tax year runs from 6 April to 5 April, so if you start trading in June 2026 (the 2026 to 2027 tax year), you need to register by 5 October 2027.

Choose your business structure (most freelancers start as sole traders).
Register for Self Assessment as self-employed on GOV.UK. You will get a Unique Taxpayer Reference (UTR).
If you work in construction as a subcontractor, also register for the Construction Industry Scheme (CIS), so contractors deduct the lower rate from your payments.
Check whether you need to register for VAT. You must register if your VAT taxable turnover goes over the threshold on GOV.UK, and you can choose to register below it.
Set up a way to keep records, invoices and receipts from the start.

Self Assessment deadlines and payments on account

Each tax year you report your income and expenses on a Self Assessment tax return. The main deadlines are:

31 October: paper tax returns.
31 January: online tax returns, and paying the tax you owe for the tax year that ended the previous April.
31 July: the second payment on account, if you make them.

Payments on account are advance payments towards next year's bill, usually each half of your previous year's bill, due on 31 January and 31 July. You don't have to make them if your last bill was under £1,000 or if more than 80% of your tax was already taken at source, for example through PAYE. Your first year can feel expensive: the January payment can include the balance for your first year plus your first payment on account for the next.

Late returns and late payments bring penalties and interest, so put the dates in your calendar now.

National Insurance when you're self-employed

Self-employed people pay National Insurance on their profits through Self Assessment.

Class 4 is paid on profits above the Lower Profits Limit.
Class 2: from 6 April 2024, if your profits are above the Small Profits Threshold you no longer have to pay Class 2, but you still get access to contributory benefits such as the State Pension. If your profits are below the threshold, you can choose to pay Class 2 voluntarily to protect your National Insurance record.

The rates and thresholds change from year to year, so check the current figures on GOV.UK rather than relying on last year's numbers.

Making Tax Digital for Income Tax

Making Tax Digital (MTD) for Income Tax changes how many sole traders and landlords report to HMRC. If it applies to you, you keep digital records in software that works with MTD and send HMRC quarterly updates, then finalise the year.

From 6 April 2026: if your qualifying income (from self-employment and property, before expenses) is over £50,000.
From 6 April 2027: if it is over £30,000.
From 6 April 2028: if it is over £20,000.

HMRC uses the qualifying income from an earlier tax return to decide when you start, and some people are exempt. Use HMRC's checker on GOV.UK to see if and when MTD applies to you.

Keep good records from day one

HMRC expects you to keep records of your business income and expenses, and to keep them for at least 5 years after the 31 January submission deadline for that tax year.

Every invoice you send, and when it was paid.
Receipts for business expenses, including what each was for.
Business mileage: date, journey, purpose and miles.
Bank statements, and records of any money you take out or put in.

Logging as you go is far easier than rebuilding a year from bank statements in January. It also helps you claim the allowable expenses you are entitled to; GOV.UK explains what counts.

Get the basics in place

A separate bank account makes records simpler, even though sole traders don't legally need one.
Insurance: public liability and professional indemnity are common, and many clients ask for them.
Clear payment terms on every invoice, and a written agreement for each piece of work.
A simple way to find work: a good CV and profile, and a habit of asking past clients for referrals.

How 3lanse helps

3lanse brings the admin of being self-employed into one place. On 3lanser Plus you keep clients and projects, log days and mileage, record expenses, manage tasks and send invoices, pro formas, credit notes and statements. On 3lanser Pro, Aidmin, the AI admin assistant built into 3lanse, reads receipts from a photo, prepares invoices for you to confirm and prepares monthly and yearly reports for your accountant.

3lanse is not accounting software and doesn't file returns with HMRC, so use it alongside your accountant or MTD-compatible software where you need it.

This guide is general information for UK freelancers, checked against the official sources below on the review date. It is not tax, legal or financial advice. Rules change, so check the sources or speak to a qualified adviser about your own situation.

How to become self-employed in the UK