Information correct as of August 2026. Tax rates and thresholds are stated for the 2026/27 tax year where given. Always verify against current GOV.UK and HMRC guidance before making decisions. This guide provides general information only and does not constitute tax advice.
If you work for yourself — as a freelancer, consultant, tradesperson, or in any other self-employed capacity — you are almost certainly operating as a sole trader. It is the simplest and most common business structure in the UK.
A sole trader is a self-employed individual who runs their business in their own name, without forming a separate legal entity. Unlike a limited company, there is no legal separation between you and your business: your profits are your personal income, and you are personally responsible for any business debts.
One point worth clarifying upfront: “sole trader” and “self-employed” mean the same thing for UK tax and legal purposes. “Sole trader” is your legal and tax structure; “self-employed” describes how you work. Both terms refer to the same status — HMRC treats them identically.
HMRC requires you to register for Self Assessment by 5 October in the tax year after the one in which you began self-employment. The UK tax year runs from 6 April to 5 April.
So if you began trading at any point between 6 April 2025 and 5 April 2026 (the 2025/26 tax year), your registration deadline is 5 October 2026.
Missing this deadline can result in a penalty from HMRC — even if you have no tax to pay and no income to declare above your allowances.
You must register as a sole trader once your self-employment income exceeds the £1,000 trading allowance in a tax year. This allowance is a tax-free threshold for low-level or incidental income; once you earn more than £1,000 from self-employment in a year, HMRC requires you to register and file a Self Assessment tax return.
This includes:
HMRC’s trigger is the date you started receiving self-employment income, not the date you decided to formalise things or set up a business bank account. If you received your first payment in June 2025, your self-employment started in June 2025. Using a later date could cause you to miss the registration deadline or inadvertently misstate your start date on the registration form.
The online registration takes around ten minutes. Before you begin, have the following ready:
HMRC’s online registration is the quickest and most straightforward route.
Tip: You can also register by post using form SA1, available on GOV.UK. However, the online route is considerably faster and is the recommended approach for most people.
Once registered, you must file a Self Assessment tax return each year, reporting your self-employment income and expenses. Filing deadlines for the 2026/27 tax year (which ends 5 April 2027) are:
Any tax owed for the year is also due by 31 January. HMRC may also require you to make payments on account — advance payments towards the following year’s tax bill — if your tax
liability exceeds £1,000. Check GOV.UK — Self Assessment tax returns for full details.
As a sole trader in 2026/27:
HMRC requires sole traders to keep business records — invoices, receipts, bank statements, and expense records — for at least 5 years after the 31 January submission deadline for the relevant
tax year. Good records from day one mean you can claim all allowable expenses, reducing your tax bill. See our bookkeeping for sole traders guide for a practical breakdown of what to keep and how.
MTD ITSA represents a significant change to how sole traders report income to HMRC. Under the phased rollout:
If you are above either threshold, you will need to be using compatible software from the relevant start date. Check GOV.UK — Making Tax Digital for Income Tax for the full timetable and what counts as qualifying income.
HMRC counts your self-employment from when you began earning self-employment income — not from when you registered, when you opened a business account, or when you told anyone you were going self-employed. If you quote a start date that is later than your actual first payment, you may inadvertently create a gap in your records or miss the 5 October deadline. Use your first invoice date or first receipt of self-employment income.
This deadline catches people out every year because it falls in the tax year after the one in which you started trading. A penalty can apply even if your tax liability is nil. Set a reminder and register promptly — there is no benefit to waiting.
Business expenses incurred before you formally registered may still be claimable, provided they were genuinely for your trade. Equipment purchased in preparation for your first client, professional indemnity insurance taken out before your first engagement, and software subscriptions set up before you began trading can all be legitimate business costs. Keep every receipt from the moment you start spending on your business — even before your UTR arrives.
The £1,000 trading allowance does not mean low-level self-employment income can be ignored indefinitely. If your income exceeds £1,000 in a tax year, the registration requirement applies. Individual circumstances vary — if you are unsure whether your income counts or how the allowance interacts with other income sources, GOV.UK — Trading allowance is the definitive reference.
For most people beginning self-employment, registering as a sole
trader is the right first step. It is free, quick, and has minimal
ongoing administrative burden.
As income grows, however, the question of whether to incorporate as a
limited company becomes relevant. A limited company creates a legal
separation between you and your business, which can reduce personal
financial risk and — at certain income levels — offer a more
tax-efficient way to extract profits through a combination of salary and
dividends.
We cover both structures in detail in our sole trader vs limited
company comparison guide, including a side-by-side tax calculation.
If you are already generating significant revenue, or if a client or
contract requires you to operate through a company, it is worth reading
before you make your decision.
The online form takes around 10 minutes to complete. Once submitted,
HMRC will send your Unique Taxpayer Reference (UTR) by post — typically
within approximately 10 working days, though this varies. Busy periods
(early October, January) can see longer waits. You cannot file a Self
Assessment return until your UTR has arrived and you have activated your
record.
No. Registering as a sole trader with HMRC is completely free. Unlike
forming a limited company (which involves a Companies House registration
fee), there is no cost to sole trader registration. The process is done
directly via GOV.UK. If a
third-party website charges you to register, you do not need their
service.
Yes. You can be employed and self-employed at the same time. Your
employer will continue to deduct income tax and National Insurance from
your salary through PAYE. Your self-employment profits are reported
separately on your Self Assessment tax return, and any additional tax
owed is calculated and paid by the 31 January deadline. You must still
register by 5 October if your self-employment income exceeds £1,000 in
the tax year.
“Freelancer” describes how you work — project-by-project, for
multiple clients, without a permanent employment contract. “Sole trader”
is your legal and tax structure. Most UK freelancers are sole traders by
default. Some choose to incorporate as a limited company instead,
typically once income is consistently high enough to make the tax and
liability trade-offs worthwhile. The two terms are not in conflict; many
sole traders describe themselves as freelancers in everyday
conversation.
As a sole trader, you pay income tax on your profits above the
Personal Allowance (£12,570 for 2026/27 for most people, assuming no
other adjustments), plus Class 4 National Insurance on profits above the
Lower Profits Limit. The exact amount depends on your total income from
all sources. For a quick estimate based on your expected profits, use
our Sole Trader
Tax Calculator. Rates and thresholds for 2026/27 should be confirmed
on GOV.UK.
Registration itself is straightforward — most people complete it
without professional help. Where an accountant adds genuine value is in
what comes next: preparing an accurate Self Assessment return,
identifying every allowable expense, planning your tax position as
income grows, and — if you are above the MTD ITSA threshold — setting up
and maintaining compliant digital record-keeping. Our AccTek sole trader
accountants page explains what we offer and how to get started.
Information correct as of August 2026 — check GOV.UK and HMRC for the latest figures.
AccTek Ltd · ICPA member · AML-supervised by HMRC · General
information only — not tax advice.
Godwin Pinto ACA (ICAI) is the founder of AccTek and a member of ICPA, with 20+ years of experience in accounting and tax for contractors, startups and SMEs. Previously at PwC.
AccTek is a member firm of the Institute of Certified Practising Accountants (ICPA). Our accountants have a wide range of qualifications and accreditations from trusted professional bodies such as the AAT, ICPA, and ACCA.
