How to Go Self Employed in the UK: 2026/27 Guide

Written by Marina Jahan · Checked by Shamayun Chowdhury, ACMA · Covers 2026/27 · Updated October 2026

Your first invoice is ready to send. Then the doubts arrive. Do you need permission? Should you have told HMRC already? How much of that money is actually yours? Anyone researching how to go self employed in the UK tends to hit these questions in the same week they land their first paying client.

Setting up on your own is far less formal than many expect. You won’t pay a start-up fee, sit an exam or wait for approval before you trade, unless your line of work needs a licence. What does matter is the order you do things in and a few dates HMRC treats seriously. Below, our accountants set out that order for the 2026/27 tax year, with real figures and the traps new sole traders fall into most.

How to Go Self Employed in the UK: Your Start-Up Checklist

Work through this table from top to bottom. Every row is explained in more detail later in the guide.

Is Working for Yourself the Right Move?

The appeal is obvious: you set your rates, pick your clients and decide when you work. The costs are less visible. There’s no holiday pay or sick pay, months can be lean, and tax isn’t taken from your earnings for you, so you have to budget for it yourself.

A few honest checks help before going self employed. Do you have a cushion of savings for slow months? Will you really ring-fence money for tax rather than spend it? And is the work genuinely yours to organise? If one client sets your hours, supplies your equipment and controls how you work, HMRC could see you as their employee. Our explainer on what counts as self-employed covers those status tests, and GOV.UK’s hub on working for yourself links to the official rules.

If you can say yes to all three, the sole trader route is the simplest way into how to go self employed in the UK.

How to Become Self Employed Officially: Telling HMRC

If you are wondering how to become self employed in the UK, HMRC registration is the only piece of official paperwork involved. It costs nothing and is done online. Once it’s processed, HMRC sets up your Self Assessment record and expects a return from you each year.

Have your National Insurance number to hand, along with your start date and a one-line description of what you do. A few weeks later your 10-digit Unique Taxpayer Reference comes through the post. Each screen of the form is covered in our walkthrough on how to register as self employed, and if that letter disappears, here’s how to track down a lost UTR.

The £1,000 test

Under the trading allowance rules, if a tax year’s total trading takings stay at £1,000 or below, HMRC generally doesn’t need to hear about them. Cross that line and registration becomes compulsory. Be careful here: it’s your takings that count, not what’s left after costs. This trips up plenty of people working out how to go self employed in the UK from a side hobby, such as selling crafts or doing weekend repairs.

Your registration deadline, with dates

You have until 5 October following the close of the tax year in which your first return becomes due. GOV.UK’s registration guidance applies it like this:

• Trading began 6 April 2025 – 5 April 2026: HMRC needs to know by 5 October 2026.
• Trading began 6 April 2026 – 5 April 2027: HMRC needs to know by 5 October 2027.

Leaving it later risks a penalty.

Your Money, Receipts and Bank Account

Messy paperwork is what turns January into a crisis, and it’s the area of going self employed that new traders tend to put off. GOV.UK says sole traders must keep records of business income and costs, and those records must be kept for a minimum of five years beyond the 31 January filing date for the year they relate to.

What to hold on to:

• copies of every invoice you send, or your till rolls
• receipts for anything you buy for the business, including software and phone costs
• a log of business journeys in your own car or van
• statements for whichever bank account the business runs through

The law doesn’t make sole traders open a separate account, yet it’s the single habit that saves the most time. Storing records digitally from the start also means you’ll be ready for Making Tax Digital, an increasingly important part of how to go self employed in the UK.

What Tax and National Insurance You’ll Pay When You Go Self Employed

The tax side surprises more people than anything else about how to go self employed in the UK. Nothing is deducted when a client pays you. Instead, your Self Assessment return calculates both Income Tax and Class 4 National Insurance from your profit, which is income less allowable costs. These 2026/27 figures apply in England, Wales and Northern Ireland; Scottish Income Tax bands differ.

Rates checked against GOV.UK’s Income Tax bands and National Insurance for the self-employed. Above £100,000 of adjusted net income, the Personal Allowance starts to taper away.

That January figure is why we tell every new client to save from the very first payment. Divert a set percentage of each invoice into a separate pot, or model your own numbers with our sole trader tax calculator.

Key Dates and the Payment-on-Account Surprise

Ask any accountant which part of how to go self employed in the UK catches people out financially, and the answer is usually timing. Using Tomasz’s July 2026 start, the calendar runs like this:

1. July 2026: trading begins and record-keeping starts.
2. 5 October 2027: deadline for telling HMRC he is self-employed.
3. 31 January 2028: 2026/27 online return due, along with the tax owed plus the opening payment on account.
4. 31 July 2028: second payment on account for 2027/28.

Paper returns have an earlier cut-off of 31 October, as listed on GOV.UK’s Self Assessment deadlines page.

Why January can cost one and a half years of tax

HMRC collects the following year’s tax in advance through payments on account, two instalments that are each usually half of your latest bill. You escape them only if that bill was below £1,000, or if more than 80% of it was collected at source, for example through a PAYE job. For a new trader with no other income, neither exception normally applies.

The cost of missing a date

File late and HMRC charges £100 immediately, whether or not you owe tax. Three months on, daily penalties of £10 begin, capped at 90 days. At six months and again at twelve, a further 5% of the tax due or £300 is added, whichever is greater. Late payment brings interest plus separate 5% penalties, according to GOV.UK’s penalty guidance.

When VAT and Making Tax Digital Apply

VAT registration becomes compulsory once your taxable turnover for the previous 12 months exceeds £90,000, or as soon as you expect to pass that figure in the next 30 days alone, per HMRC’s VAT registration rules. Below the threshold you can still register voluntarily, which tends to suit firms whose customers are VAT-registered businesses themselves.

Making Tax Digital for Income Tax now shapes how to go self employed in the UK for many people. It’s triggered by qualifying income, meaning your combined self-employment and property turnover before costs. The thresholds are above £50,000 from 6 April 2026, above £30,000 from 6 April 2027 and above £20,000 from 6 April 2028. Because HMRC measures this using returns you’ve already submitted, brand-new businesses normally join after their first returns are in. From then on you’ll keep digital records and file quarterly updates through compatible software rather than on HMRC’s website. Each quarter is set out in our explainer on Making Tax Digital for sole traders.

How to Go Self Employed in the UK and Avoid Costly Errors

Newcomers who’ve only just figured out how to go self employed in the UK tend to make the same five slip-ups. Each one is easy to prevent:

• Leaving registration until a big contract arrives. The 5 October date passes unnoticed and a penalty follows. Register shortly after takings pass £1,000.
• Treating every payment as spending money. Clients pay you the full amount, tax included. Move a share into savings the day it lands.
• Not budgeting for payments on account. The first January bill comes with an extra instalment. Plan for 150% of your first year’s tax.
• Running everything through one account. Personal and business transactions blur together. A dedicated account makes year-end checks quick.
• Assuming costs keep you under £1,000. The trading allowance looks at takings, not profit, so expenses don’t change whether you must register.

Starting while you still have a job

Lots of people build their business in evenings and weekends first. Every rule above still applies. The main difference is that your salary normally uses up the Personal Allowance, so business profit is taxed from the first pound. Factor that in when planning how to go self employed in the UK alongside a salary, and check whether your employment contract restricts outside work.

Going Self Employed? UK Questions New Sole Traders Ask

Where should you begin with how to go self employed in the UK?

Open a record of income and spending on the day you start. Registration can wait until your takings pass £1,000, but missing receipts are hard to recover months later.

How do I become self employed in the UK?

Some type how do I go self employed; others search how do I become self employed in UK, or simply how do I become self employed UK. The route never changes. Trade, keep records, register for Self Assessment once gross takings exceed £1,000, and do it by 5 October after that tax year. A return follows every January.

How do you become self employed alongside a job?

In the same way as a full-time trader. Your wages stay on PAYE, while business profit goes on your Self Assessment return. As the job normally uses your Personal Allowance, that profit is usually taxed in full.

How quickly can I register as self employed?

Filling in the online form doesn’t take long. The wait is for your UTR, which HMRC posts afterwards, so give yourself plenty of time before 5 October.

Must I tell HMRC if I only earn a few hundred pounds?

Normally not, because the trading allowance covers yearly takings up to £1,000. Registering anyway can make sense if you’d like loss relief, want to make voluntary Class 2 payments, or hope to qualify for Maternity Allowance on self-employed earnings.

What will my first-year tax bill look like?

That depends on your profit. On £32,000 for 2026/27 the combined Income Tax and Class 4 bill is £5,051.80. If it’s over £1,000, HMRC usually adds an advance instalment worth half the bill.

Is an accountant essential when you go self employed?

No. Plenty of sole traders handle their own return. Professional help pays for itself once you have more than one income, property income or Making Tax Digital quarterly updates to deal with.

Final Verdict: How to Go Self Employed in the UK Without the Stress

How to go self employed in the UK, or how to become self employed UK-wide with fewer surprises, boils down to three things: tell HMRC in time, keep records from your first sale, and treat part of every payment as HMRC’s money. Add an eye on the £90,000 VAT level and the Making Tax Digital thresholds, and your first return should feel routine.