TL;DR: Registering as a sole trader in the UK is done by registering for self-assessment with HMRC, normally through GOV.UK, by 5 October following the tax year in which the trade started. The registration is free and is the legal trigger for the sole trader to file annual self-assessment tax returns and pay income tax and Class 2 and Class 4 National Insurance contributions on the profits of the trade. Sole traders with turnover above the VAT threshold (90,000 pounds for 2026-27) must also register for VAT. A trading name can be used immediately without separate registration, but the name must follow the trading names rules in the Companies Act 2006. Sole traders should keep records of income and expenses for at least five years after the 31 January submission deadline.
Last reviewed May 2026
A sole trader is an individual carrying on a trade or profession in their own name, without forming a separate legal entity such as a limited company or limited liability partnership. The sole trader and the business are the same legal person; the sole trader is personally liable for the business's debts and obligations. Setting up as a sole trader in the UK is the simplest business structure to start, and the registration process is correspondingly straightforward.
This guide explains exactly how to register as a sole trader in the UK in 2026, the legal and tax obligations that follow, the National Insurance treatment, the VAT threshold and when to register, the trading name rules, and the basic record-keeping requirements.
How to register as a sole trader
Registering as a sole trader means registering for self-assessment with HMRC. The registration is done online through GOV.UK using the "register for self-assessment" service. The applicant needs to provide personal details (name, date of birth, address, National Insurance number) and information about the trade (start date, type of business, expected income).
HMRC processes the registration and issues a Unique Taxpayer Reference (UTR) by post to the registered address. The UTR is a 10-digit number used on all self-assessment correspondence and on the annual tax return. The applicant also receives an activation code for the Personal Tax Account or HMRC online services, which is needed to file the self-assessment tax return online.
The registration must be completed by 5 October following the end of the tax year in which the trade started. A trade that started in May 2026 (so within the 2026-27 tax year ending 5 April 2027) must be registered by 5 October 2027. Late registration can trigger a penalty, although HMRC usually accepts late registration without penalty where the sole trader registers as soon as they realise they need to.
Self-assessment and the first tax return
Once registered, the sole trader is required to file an annual self-assessment tax return reporting the income and allowable expenses of the trade. The tax return covers a tax year (6 April to 5 April), and is due online by 31 January following the end of the tax year. A paper return is due by 31 October following the end of the tax year.
The self-assessment tax return for sole traders typically uses the SA100 main return plus the SA103 self-employment supplementary pages. The SA103S short-form version is acceptable where turnover is below the VAT threshold (currently 90,000 pounds); the SA103F full-form version is used above that. The return reports gross income, allowable business expenses, the resulting trading profit, and any other income (employment income, pensions, savings interest, dividends).
The tax due is the income tax and Class 2 and Class 4 National Insurance contributions on the trading profit, plus tax on any other income. Payment is due by 31 January each year. Where the tax bill is large, a "payments on account" system applies: half of the previous year's tax bill is due on 31 January and another half on 31 July, with the balancing payment (up or down) due the following 31 January.
National Insurance for sole traders
Sole traders pay two classes of National Insurance contributions on their trading profits. Class 2 is a flat-rate weekly contribution paid by self-employed people; the rate for 2026-27 is set in the annual NI uprating exercise. Class 2 contributions count towards the State Pension and certain other benefits. From April 2024, Class 2 NICs became effectively notional for self-employed people earning above the Class 4 lower profits threshold, with the State Pension qualification credited automatically.
Class 4 is a percentage-of-profits contribution, payable above a lower profits threshold and capped at an upper profits threshold. The rates for 2026-27 are set in the annual uprating exercise and have been a focus of recent budgets. Class 4 contributions do not count towards the State Pension; they are a pure tax on self-employed profits.
Sole traders with profits below the small profits threshold can choose to pay voluntary Class 2 contributions to maintain their National Insurance record for State Pension purposes. The voluntary contribution route is administered by HMRC and is normally claimed through the personal tax account.
VAT registration thresholds
A sole trader whose turnover (taxable supplies) exceeds 90,000 pounds in any rolling 12-month period must register for VAT under the compulsory registration rules. The 90,000 pound threshold applies for 2026-27 and is reviewed annually in the budget. The registration must be done within 30 days of the end of the month in which the threshold was crossed.
Voluntary VAT registration below the threshold is also possible and is often advantageous where the sole trader's customers are themselves VAT-registered businesses (who can reclaim the VAT charged by the sole trader). Voluntary registration also allows the sole trader to reclaim VAT on business purchases. The decision depends on the customer profile and the level of input VAT.
VAT registration is done online through GOV.UK. The sole trader receives a VAT registration number and a registration certificate. VAT returns are typically due quarterly under Making Tax Digital, with submission through compatible software. The sole trader collects VAT from customers and accounts for it on the quarterly return, after deducting any input VAT on business purchases.
Trading names and the Companies Act 2006
A sole trader can trade in their own name or under a separate trading name. The trading name does not need to be registered (there is no equivalent of Companies House registration for sole trader names), but it must follow the rules in the Companies Act 2006. The trading name cannot include words such as "Limited", "Ltd", "PLC", "LLP" or other terms that imply a different legal status.
The trading name cannot include sensitive words and expressions without consent (such as "British", "Royal", "Bank", or words implying official status), under the Companies, Limited Liability Partnerships and Business (Names and Trading Disclosures) Regulations 2015. The trading name must not be the same or so similar to an existing registered company that it would be misleading.
The sole trader must disclose their name and a business address on letters, emails, websites and other business documentation if a trading name is used. The disclosure rule allows customers and creditors to identify the legal person they are dealing with. A failure to disclose can produce a fine under the Companies Act rules.
Record-keeping requirements
HMRC requires sole traders to keep records of all income and allowable business expenses for at least five years from the 31 January submission deadline for the relevant tax year. So records for the 2026-27 tax year (return filed by 31 January 2028) must be kept until at least 31 January 2033.
The records must support the figures on the self-assessment tax return: sales invoices and receipts (for income), purchase invoices and receipts (for expenses), bank statements, mileage logs (if claiming car expenses), and capital expenditure records (for assets eligible for capital allowances). Where the sole trader uses the cash basis for accounting, only cash actually received and paid is recorded; where the sole trader uses traditional accruals accounting, sales invoiced and expenses incurred are recorded regardless of cash flow.
Making Tax Digital for Income Tax Self Assessment (MTD ITSA) is being phased in for self-employed people. Sole traders with annual turnover over the relevant threshold are required to keep digital records and submit quarterly updates to HMRC through MTD-compatible software, with a final declaration at the end of the tax year. The implementation has been deferred multiple times; the current schedule should be checked on GOV.UK.
Choosing between sole trader and limited company
Sole trader is the simplest structure but is not always the right choice. A limited company is a separate legal entity that owns the business assets and liabilities; the owner's personal assets are not at risk for the company's debts (subject to specific exceptions). The tax treatment of a limited company differs: corporation tax on company profits, plus income tax and National Insurance on salary, plus dividend tax on dividends.
The tax efficiency of one structure over the other depends on the level of profits, the use of dividends versus salary, the need to retain profits in the business, and the planning around state benefits and pension contributions. For most sole traders with profits below around 50,000 pounds a year, the sole trader structure is administratively simpler and tax-wise similar to or slightly better than a limited company. Above that level, the limited company can become more tax-efficient, although the gap has narrowed since the 2022 increase in corporation tax to 25 percent on most profits above 250,000 pounds and the changes to the dividend allowance.
The choice should also consider non-tax factors: the perception of customers (a limited company can look more substantial), the regulatory burden (a limited company files annual accounts at Companies House and a corporation tax return at HMRC), and the personal liability position. Many sole traders start as sole traders and incorporate later as the business grows.
How we verified this
This article reflects current GOV.UK guidance on registering as a sole trader, self-assessment, Class 2 and Class 4 National Insurance contributions and VAT registration. The Companies Act 2006 trading names rules and the Companies, Limited Liability Partnerships and Business (Names and Trading Disclosures) Regulations 2015 reflect the current legislation. The HMRC penalty regime for late registration and late filing reflects the Schedule 55 Finance Act 2009 framework. Specific thresholds and rates change at each annual budget and the latest figures should be checked on GOV.UK for the relevant tax year.
Disclaimer: This article is general information about registering as a sole trader in the UK. It is not personal tax, legal or business advice. The right structure and the right tax treatment depend on individual circumstances. Anyone setting up a business should take advice from an accountant or business adviser, and should refer to GOV.UK for the current registration requirements.
Frequently asked questions
How do I register as a sole trader in the UK?
Register for self-assessment with HMRC through GOV.UK. The registration is free and is the legal trigger for the sole trader to file annual self-assessment tax returns and pay income tax and National Insurance on the profits of the trade. The registration must be done by 5 October following the end of the tax year in which the trade started.
How much does it cost to register as a sole trader?
HMRC registration for self-assessment is free. There are no Companies House fees (there is no equivalent registration for sole traders). The costs of being a sole trader come from running the business: accountant fees if used, software for bookkeeping and Making Tax Digital, professional indemnity insurance if relevant, and business banking fees. Many sole traders run on minimal overhead, using free or low-cost bookkeeping software and filing self-assessment without an accountant.
Do I need to register as a sole trader straight away?
The deadline is 5 October following the end of the tax year in which the trade started. So a trade that began in May 2026 must be registered by 5 October 2027. Registering as soon as the trade starts is administratively cleaner and gives more time to set up the bookkeeping system before the first tax return is due.
Do I need to register for VAT as a sole trader?
VAT registration is compulsory once turnover (taxable supplies) exceeds 90,000 pounds in any rolling 12-month period (the 2026-27 threshold, reviewed annually). Voluntary registration below the threshold is also possible and may be advantageous depending on the customer profile. VAT registration is separate from self-assessment registration and is done through GOV.UK.
What records do I need to keep as a sole trader?
HMRC requires records of income and allowable business expenses to be kept for at least five years from the 31 January submission deadline. Records include sales invoices, purchase receipts, bank statements, mileage logs, and capital expenditure records. Making Tax Digital for Income Tax Self Assessment is being phased in and requires digital records and quarterly updates for sole traders above the relevant turnover threshold.
