How to Become a Sole Trader in the UK: Step by Step

Becoming a sole trader is the simplest way to start working for yourself in the UK. There is no company to form and no fee to pay to get going, but there are a few steps you must take with HMRC and a few habits that will save you stress later. This guide walks you through them in order. It is general information, not tax or legal advice, and rates and thresholds change every tax year, so check GOV.UK or speak to an accountant before you rely on any figure.

A sole trader is a self-employed person who runs a business as an individual. You keep all the profit after tax, you make the decisions and you deal with HMRC through your own Self Assessment tax return. You and the business are the same legal person, which keeps things simple but also means the risk sits with you.

Plenty of people become sole traders without ever thinking of it that way: a freelance designer, a dog walker, a tutor, a plumber, a consultant. If you sell your own services or goods and are not doing it through a limited company or partnership, you are probably already a sole trader in HMRC's eyes. The steps below make it official and set you up properly.

Step 1: Check that sole trader is the right setup

Before you register anything, make sure being a sole trader fits what you plan to do. The main alternatives are a limited company and a partnership. Each has a different mix of admin, tax treatment and personal risk.

Being a sole trader usually suits you if:

• You are starting small or testing an idea alongside other work.
• You want the least paperwork and the simplest tax return.
• Your work carries a modest risk of large debts or claims, or you can cover that risk with insurance.
• You are working alone rather than with a co-founder who shares the profits.

A limited company may be worth comparing if your profits are growing fast, if clients insist on working with companies, or if you want the business's debts kept separate from your personal assets. You can always start as a sole trader and change structure later, though switching has its own admin and tax points to consider.

Step 2: Work out whether you need to register with HMRC

The trigger for registering is your income from self-employment. You must register for Self Assessment if you earn more than £1,000 from self-employment in a tax year. The UK tax year runs from 6 April to 5 April, so the current one is 6 April 2026 to 5 April 2027.

That £1,000 figure is linked to the trading allowance. If your gross trading income is £1,000 or less in a tax year, it may be covered in full, and you may not need to tell HMRC, though there are exceptions. Once you go above £1,000, you need to register and file a return.

For example, if you started freelancing in June 2026, that falls in the 2026/27 tax year, which ends on 5 April 2027. You would need to register by 5 October 2027. Registering late and not paying your tax by 31 January can lead to a "failure to notify" penalty, so it is better to register as soon as you know you will cross the £1,000 line.

Step 3: Register for Self Assessment

Registration is done online through GOV.UK. It is free, and you do not need an accountant to do it. Here is the usual order of things:

1. Gather your details. Have your National Insurance number, your contact details, the date you started self-employment and a short description of what your business does.
2. Create or sign in to your Government Gateway account. This is the account you will use to manage your tax online. Keep your sign-in details safe.
3. Register as self-employed for Self Assessment. Follow the GOV.UK service and answer the questions about your business. Use a business name if you have one, or your own name.
4. Wait for your Unique Taxpayer Reference (UTR). HMRC sends you a UTR, a 10-digit number that identifies you for Self Assessment. Keep it somewhere safe; you will need it every year.
5. Activate your online account. Follow any instructions HMRC sends to finish setting up access so you can file your return online.

Step 4: Choose a name and set up the basics

You can trade under your own name or a business name. If you use a business name, there are rules: for example, it cannot include "limited," "Ltd," "LLP" or "plc," it cannot be offensive and it must not be the same as an existing trade mark. Some sensitive words need permission. Check the trade mark register and the Companies House register before you commit, and remember that a sole trader name is not "registered" the way a company name is.

Next, set up the practical pieces that make running the business easier:

• A bank account. Sole traders are not legally required to have a separate business bank account, but it is strongly recommended, and some banks require a business account for business use.
• A record-keeping system. A spreadsheet or bookkeeping software that tracks every sale and every expense.
• An invoice template. GOV.UK sets out what an invoice must include, such as a unique number, your name and any business name, your contact details, the customer's details, a description of the work, dates and amounts.
• Insurance. Depending on your work, you might look at public liability, professional indemnity or equipment cover. Because you have unlimited liability, this matters more than many new sole traders realize.

Step 5: Understand the tax you will pay

As a sole trader, you pay Income Tax and National Insurance on your profits, which means your income minus allowable business expenses. Nothing is deducted automatically, so you work out what you owe through your Self Assessment return.

Income Tax

For 2026/27 in England, Wales and Northern Ireland, the Personal Allowance is £12,570. The basic rate of 20% applies on income from £12,571 to £50,270, the higher rate of 40% from £50,271 to £125,140, and the additional rate of 45% above £125,140. The Personal Allowance reduces by £1 for every £2 of adjusted net income over £100,000. Scotland has different Income Tax bands, so check the Scottish rates if you live there.

National Insurance

Self-employed people pay Class 4 National Insurance at 6% on profits between £12,570 and £50,270 and 2% on profits above £50,270. If your profits are £7,105 or more, Class 2 is treated as paid, which protects your National Insurance record without you paying it. If your profits are below that, you can choose to pay voluntary Class 2 contributions at £3.65 a week.

You can also reduce your taxable profit with allowable expenses: costs incurred wholly and exclusively for the business, such as office costs, travel that is not commuting, stock, marketing and relevant training. Cash basis accounting is the default for sole traders, so you record income and expenses when money actually comes in or goes out.

Step 6: Learn your yearly deadlines

Once you are registered, your year has a rhythm. The key Self Assessment dates are:

• 31 October: deadline for paper returns for the tax year that ended the previous April.
• 31 January: deadline for online returns and for paying any tax you owe (the balancing payment), plus your first payment on account if one applies.
• 31 July: second payment on account, if one applies.

Payments on account catch many new sole traders out. If your last bill was £1,000 or more and less than 80% of your tax was collected at source, HMRC asks for two advance payments toward next year, each normally half of last year's bill. In your first year of filing, that can mean paying your first year's tax plus half as much again in the same January.

Miss a deadline and penalties apply. A late return brings a £100 penalty straight away, with more after three, six and 12 months. Late payment adds 5% of unpaid tax at 30 days, six months and 12 months, plus interest. If you had a reasonable excuse, you can appeal.

Step 7: Build simple habits from day one

The admin side of being a sole trader is far easier when you never let it pile up. A few habits make the biggest difference:

• Set aside tax from every payment. Move a fixed share of each payment into a separate savings account. As a rough rule of thumb, start with a share somewhere around a quarter to a third of profit and adjust once you see your real numbers.
• Capture receipts the same day. Photograph or forward them into one place so nothing is lost.
• Do a short weekly bookkeeping slot. Categorize transactions, chase unpaid invoices and check your tax pot.
• Review your setup once a year. Check whether VAT registration, Making Tax Digital or a change of structure might apply as you grow. The VAT registration threshold is £90,000 of taxable turnover.

Frequently asked questions

The bottom line

Becoming a sole trader in the UK is mostly about timing and habits: start trading, register for Self Assessment once you go past £1,000 of self-employed income and before the 5 October deadline, then keep clean records and set money aside for tax. Do those things and your first tax return will feel routine rather than frightening.

This is general information, not tax or legal advice. Rates, thresholds and rules change every tax year, so check the latest guidance on GOV.UK or with HMRC, and speak to an accountant if your situation is not simple.