TL;DR: Setting up as a sole trader in the UK means registering with HMRC for Self Assessment by 5 October following the end of the tax year in which the self-employed activity started (so self-employment starting in 2025-26 must be registered by 5 October 2026). The registration is free and is done online through GOV.UK or via the HMRC business helpline. The sole trader keeps full personal responsibility for the business (no separate legal entity), files an annual Self Assessment tax return, pays income tax and Class 4 National Insurance on the profits, must register for VAT if turnover exceeds 90,000 pounds in any rolling 12-month period, and is in scope of Making Tax Digital for Income Tax from April 2026 for trading or property income above 50,000 pounds (and from April 2027 above 30,000 pounds).
Last reviewed May 2026
Sole trader status is the simplest form of self-employment in the UK. There is no separate legal entity, no Companies House filing, no shareholders, and no directors. The trader and the business are the same legal person, and the profits are taxed as the trader's personal income. The set-up process is genuinely lightweight, but a handful of steps need to be done correctly and on time to avoid penalties.
This guide walks through every step of setting up as a sole trader in the UK: when to register with HMRC, the registration process itself, choosing a business name, the National Insurance position, the VAT threshold, the bookkeeping standards, the impact of Making Tax Digital, and the things that can be done from day one to make the first tax return easier.
What "sole trader" actually means
A sole trader is an individual carrying on a trade, profession, or vocation as a self-employed person. There is no separate legal entity: the trader's business assets, liabilities, and tax position are part of their personal position. If the business is sued, the trader's personal assets are at risk; if the business owes tax, the trader owes the tax personally.
This is the simplest form of operating a business in the UK. There is no Companies House filing, no shareholders, no formal accounts in the company-law sense, and no annual confirmation statement. The only formal filings required are the annual Self Assessment return (with the self-employment supplementary pages) and any VAT returns if VAT-registered.
Sole trader status is distinct from operating as a limited company. A limited company is a separate legal entity registered at Companies House, with its own tax position (corporation tax on profits), separate accounts, and directors who are typically (but not always) shareholders. The two structures have very different tax, liability, and compliance implications.
When to register with HMRC
The legal deadline for registering as a sole trader is 5 October following the end of the tax year in which the self-employed activity started. A trader who started a business at any point during the 2025-26 tax year (6 April 2025 to 5 April 2026) must register with HMRC by 5 October 2026.
In practice it is sensible to register as soon as the trading activity becomes regular, rather than waiting close to the deadline. Registering generates the Unique Taxpayer Reference (UTR) used for Self Assessment, gives access to the online tax account, and reduces the risk of penalty for late registration.
The penalty for late registration is calculated under HMRC's "failure to notify" rules. The standard penalty is up to 30 percent of the tax due where the late registration was non-deliberate but not concealed, rising to 100 percent for deliberate and concealed late registration. The penalty can be reduced if the trader contacts HMRC and discloses the position before HMRC begins enquiring.
How to register: the steps
The registration is done online through GOV.UK at the "Register for Self Assessment if you are self-employed" page. The trader needs a Government Gateway account, the National Insurance number, the date the self-employed activity started, the type of business activity (in HMRC's standard industry categories), and the trading address.
HMRC issues the UTR by post to the trader's address within a few working days (typically 10 working days for a UK address). The UTR is a 10-digit number used on every Self Assessment return and on tax correspondence. The trader should keep the UTR safe and accessible.
The trader is also enrolled in the Self Assessment system at the same time. Future Self Assessment returns can be filed online through the personal tax account using the same Government Gateway credentials. A paper return remains an option but the deadlines are earlier (31 October for paper, 31 January for online).
For traders who are already in Self Assessment for another reason (high earner, property income, dividends), the process is slightly simpler. The trader uses form CWF1 to add self-employment to the existing Self Assessment record, rather than creating a new registration from scratch.
Choosing a business name
A sole trader can trade under their own personal name or under a trading name. Trading under a personal name (e.g. "Jane Smith") requires no special steps. Trading under a business name (e.g. "Jane's Garden Design") is also allowed but the trading name must not be identical or too similar to an existing trade mark, must not include certain restricted words (such as "Limited", "Ltd", "PLC"), and must not be misleading.
If the trader uses a trading name, the trader's actual personal name and a contact address must appear on business documents (letters, invoices, websites) under the Business Names Act 1985 (now consolidated into the Companies Act 2006). The trader's personal name does not need to dominate the document, but it must be clearly stated.
A sole trader cannot register a business name at Companies House (that is only for limited companies and LLPs). They can register a trade mark with the Intellectual Property Office if the name is distinctive enough and they want exclusive rights to use it in their trading sector. Trade mark registration is optional and has its own cost.
National Insurance for sole traders
From 6 April 2024, Class 2 National Insurance was effectively abolished as a separate liability for self-employed people with profits above the small profits threshold. Class 2 is now treated as paid automatically by virtue of profits above the threshold, with no payment required. Self-employed people below the small profits threshold can still pay voluntary Class 2 to maintain State Pension and benefit entitlement.
Class 4 NI applies to self-employed profits. For 2025-26 the rate is 6 percent on profits between 12,570 pounds and 50,270 pounds, and 2 percent on profits above 50,270 pounds. Class 4 is calculated and collected through the Self Assessment return, due alongside the income tax bill on 31 January following the end of the tax year.
Income tax applies to profits at the standard income tax rates: 20 percent basic rate on profits within the basic-rate band (after the personal allowance), 40 percent on profits in the higher-rate band, 45 percent above the additional-rate threshold. Scotland operates separate income tax rates and bands.
The combined effect for a typical sole trader earning, say, 35,000 pounds of profit is roughly: 12,570 pounds tax-free (personal allowance), 4,486 pounds income tax at 20 percent on the next 22,430 pounds, plus Class 4 NI of 1,346 pounds on the 22,430 pounds above the lower limit. The trader pays the total of around 5,832 pounds in tax and NI through Self Assessment.
VAT, payments on account, and the 90,000 pound threshold
A sole trader must register for VAT if their VAT-taxable turnover (total sales of standard, reduced, or zero-rated supplies) exceeds 90,000 pounds in any rolling 12-month period (the threshold from 1 April 2024). They must also register if they expect their turnover to exceed 90,000 pounds in the next 30 days alone.
Voluntary VAT registration is allowed below the threshold and can be commercially useful where the business mainly sells to VAT-registered customers (who can recover the VAT charged) or where the business incurs significant input VAT that would otherwise be a cost. Voluntary registration brings the compliance burden of VAT returns (typically quarterly) and any associated bookkeeping requirements.
Payments on account apply to sole traders whose annual Self Assessment tax bill exceeds 1,000 pounds (excluding amounts already collected through PAYE). Two payments on account are made each year, on 31 January and 31 July, each equal to 50 percent of the previous year's tax. A balancing payment is made on the following 31 January for any shortfall. This can be cash-flow demanding in the first profitable year.
Making Tax Digital for Income Tax Self Assessment (MTD ITSA) brings new requirements for digital record-keeping and quarterly updates to HMRC. From 6 April 2026, MTD ITSA applies to self-employed traders and landlords with combined trading and property income above 50,000 pounds. From 6 April 2027 the threshold drops to 30,000 pounds. From 6 April 2028 the threshold is expected to drop further to 20,000 pounds. Affected traders must use HMRC-approved software to keep records and submit quarterly updates.
Bookkeeping and what to do from day one
The trader must keep records of all business income and expenses for at least 5 years after the 31 January submission deadline for the relevant tax year. Records can be kept on paper, in a spreadsheet, or in accounting software. From the start of MTD ITSA the records will need to be digital for affected traders.
Opening a separate business bank account (or a dedicated personal account used only for the business) is not legally required for a sole trader, but it makes bookkeeping much easier. Mixed personal-and-business accounts create constant reconciliation work and increase the risk of missing deductible expenses.
Keeping receipts and invoices for every business expense is essential. Allowable expenses for a sole trader broadly include: business premises costs (or a proportion of home-office costs); business travel; phone, internet, and computer costs; professional fees; staff costs; stock; advertising; insurance; and most genuine business overheads. Personal-use costs are not deductible.
From the first day of trading, the trader should consider: the basis period (HMRC reformed the rules so that profits are now taxed on a tax-year basis from 2024-25); whether to use the cash basis or the accruals basis for accounts (small businesses below the cash basis turnover limit can elect for cash basis); and whether the trader needs business insurance (public liability, professional indemnity, employer's liability if they hire anyone).
How we verified this
The thresholds, deadlines, and procedures described here are drawn from HMRC's published Self Assessment registration guidance, the Finance Acts (which set the income tax and NI rates), the Companies Act 2006 (business name rules), and HMRC's published guidance on Making Tax Digital for Income Tax Self Assessment. The VAT threshold of 90,000 pounds is the rate from 1 April 2024. The NI rates and income tax bands are for 2025-26. No fabricated HMRC reference numbers, individual trader details, or specific case figures have been used.
Disclaimer: This article is general information about setting up as a sole trader in the UK. It is not personal tax or business advice. Specific tax, accounting, and legal arrangements depend on the individual trader's circumstances and business activity. Anyone setting up a new business should consider taking advice from a qualified accountant, especially on the choice between sole trader and limited company structures.
Frequently asked questions
How do I set up as a sole trader in the UK?
Register with HMRC for Self Assessment as a self-employed person through GOV.UK by 5 October following the end of the tax year in which you start trading. Keep records of all business income and expenses. File an annual Self Assessment return by 31 January (online) following the end of the tax year. Pay income tax and Class 4 National Insurance on the profits. Register for VAT if your VAT-taxable turnover exceeds 90,000 pounds in any rolling 12-month period.
When do I have to register as a sole trader?
The legal deadline is 5 October following the end of the tax year in which you started self-employment. For self-employment that begins in the 2025-26 tax year (6 April 2025 to 5 April 2026), the registration deadline is 5 October 2026. Late registration triggers penalties under HMRC's "failure to notify" rules, ranging from a percentage of the tax due to higher penalties for deliberate non-compliance.
Do I need a business bank account as a sole trader?
Not legally. A sole trader can use a personal bank account for the business, although banks' standard terms often prohibit business use of a personal account. A separate business account (or a dedicated personal account used only for the business) is strongly recommended in practice because it makes bookkeeping, tax returns, and any HMRC enquiry far simpler.
When do I need to register for VAT?
You must register for VAT if your VAT-taxable turnover exceeds 90,000 pounds in any rolling 12-month period (the threshold from 1 April 2024), or if you expect your turnover to exceed 90,000 pounds in the next 30 days alone. Voluntary VAT registration is allowed below the threshold and can be commercially useful for businesses that mainly supply VAT-registered customers or that have significant input VAT to recover.
What about Making Tax Digital?
Making Tax Digital for Income Tax Self Assessment (MTD ITSA) requires self-employed traders and landlords above certain income thresholds to keep digital records and send quarterly updates to HMRC using approved software. The threshold is 50,000 pounds of combined trading and property income from 6 April 2026, dropping to 30,000 pounds from 6 April 2027 and an expected further 20,000 pounds from 6 April 2028. Affected sole traders will need to choose MTD-compatible accounting software in advance.
