Am I actually self-employed in HMRC's eyes?
You can call yourself self-employed, but HMRC makes its own determination based on how your working relationship actually operates. If HMRC disagrees with your status, the financial consequences fall on whoever engaged you — and on you.
The key questions HMRC considers: Do you control how and when the work is done? Can you send a substitute if you are unavailable? Do you risk your own money if the work goes wrong? Do you work for multiple clients? Do you supply your own equipment?
The more of those questions you answer yes to, the more likely HMRC is to accept self-employment status. If you work regular hours, for one client, at their premises, under their direction, using their equipment, HMRC may decide you are actually an employee or worker — regardless of what your contract says.
HMRC's Check Employment Status for Tax (CEST) tool lets you test your status before it becomes a problem: https://www.gov.uk/guidance/check-employment-status-for-tax. Run it early. Getting this wrong has real consequences.
Employed, self-employed, or limited company — key differences
| Factor | Employed | Self-Employed (sole trader) | Limited Company |
|---|---|---|---|
| Who pays your tax | Employer deducts via PAYE | You pay via Self Assessment | Company pays corporation tax; you manage personal tax separately |
| How you register | Employer registers you — nothing for you to do | Register with HMRC as self-employed | Register at Companies House and with HMRC |
| National Insurance class | Class 1 (employee and employer contributions) | Class 2 and Class 4 (verify current rates at GOV.UK) | Class 1 on salary; dividends taxed differently |
| Personal liability | None beyond your employment | Unlimited personal liability for business debts | Limited to share capital — personal assets protected |
| Admin burden | Low — employer handles payroll | Medium — annual Self Assessment required | High — accounts, corporation tax return, confirmation statement |
Registering with HMRC
You must register with HMRC as self-employed by 5 October in your second tax year of trading. The UK tax year runs from 6 April to 5 April. So if you started trading in, say, November 2025 (tax year 2025/26), you must register by 5 October 2026.
Do not wait until then. Register as soon as you start trading. Late registration can result in a penalty, and you also need a Unique Taxpayer Reference (UTR) to file your Self Assessment return — which takes a few weeks to arrive in the post.
Register online at GOV.UK: https://www.gov.uk/log-in-file-self-assessment-tax-return/register-if-youre-self-employed.
When you register you get: a UTR (Unique Taxpayer Reference — a 10-digit number used on all HMRC correspondence), registration for Self Assessment, and registration for Class 2 National Insurance contributions.
National Insurance for self-employed people
Self-employed people pay two classes of National Insurance, both of which matter for your state pension entitlement.
Class 2 NI is a flat weekly rate. It has been through significant legislative changes recently — verify the current position and rate at GOV.UK before assuming anything. https://www.gov.uk/self-employed-national-insurance-rates
Class 4 NI is paid on profits above the lower profits limit. The rate and thresholds change each April — verify the current figures at GOV.UK.
Both classes count toward your state pension qualifying years. Each year you pay sufficient NI builds one qualifying year. You need 35 qualifying years for the full new state pension. For self-employed people, this NI entitlement is less automatic than for employees — it is worth keeping an eye on your state pension forecast on the GOV.UK Personal Tax Account.
If your profits are below the small profits threshold, you do not have to pay Class 2 NI — but you can choose to pay voluntarily to protect your state pension entitlement. Verify the current threshold at GOV.UK.
Self Assessment — the annual requirement
As a self-employed person, you must file a Self Assessment tax return every year. This is how HMRC collects income tax and Class 4 NI on your profits.
What you report: your income from self-employment, any allowable business expenses, and any other income (employment income, rental income, savings interest above the personal savings allowance).
Deadlines: 31 January for online filing (covering the previous tax year). 31 October for paper filing. Miss the 31 January deadline and penalties start immediately.
What counts as allowable expenses: costs wholly and exclusively for the business. Common examples include office supplies, equipment, professional subscriptions, accountancy fees, marketing costs, business insurance, and travel to client sites (not commuting). Home office costs can be claimed, either as a simplified flat rate or as a proportion of actual costs.
See the full Self Assessment guide at /tax/self-assessment, including the payments on account explanation.
Payments on account — budget for 150% of your first year's tax bill
This is the most common financial shock for first-time self-employed people, and it is worth being very clear about it.
When you file your first Self Assessment return and HMRC calculates what you owe, they do not just ask for that amount. They also demand two payments on account toward the following year's tax — each equal to 50% of your current bill. The first payment on account is due at the same time as your current year's tax, in January. The second is due the following July.
So if your first Self Assessment bill is £4,000, HMRC will ask for £6,000 in January: £4,000 for the year just ended plus £2,000 toward next year. Then another £2,000 in July.
Set aside money from day one. A reasonable rule: put aside 30% of everything you earn for tax and NI, and do not touch it. In your first year, the total due is closer to 150% of your annual tax bill because of the January payment on account.
The VAT threshold
If your taxable turnover exceeds the VAT registration threshold in any rolling 12-month period, you must register for VAT. The current threshold is £90,000 — verify at GOV.UK as it can change: https://www.gov.uk/vat-registration/when-to-register.
Once registered, you must charge VAT on most goods and services, file quarterly VAT returns, and pay the collected VAT to HMRC. The standard VAT rate is 20%.
You can register voluntarily before reaching the threshold. There are situations where voluntary registration makes sense — if most of your clients are VAT-registered businesses (they can reclaim the VAT you charge), or if you have significant VAT on your costs that you want to reclaim. For businesses selling mainly to consumers, voluntary registration adds admin complexity without much benefit below the threshold.
The trading allowance
The trading allowance lets you earn up to £1,000 from self-employment in a tax year without paying any income tax or NI on it, and without needing to register for Self Assessment.
This is genuinely useful for small hobby income, occasional freelance work, or side activities that do not yet amount to a serious business. If your self-employment income is under £1,000 in the year, you can use the trading allowance and stay out of Self Assessment entirely.
Once you exceed £1,000, you cannot use the trading allowance and must register for Self Assessment. You then deduct your actual allowable expenses in the normal way — you cannot use the trading allowance and claim actual expenses in the same year.
Sole trader or limited company?
Most people starting out in self-employment operate as sole traders. It is simpler to set up, simpler to run, and requires less administration. You are the business — there is no legal separation between you and it.
A limited company is a separate legal entity. It offers personal liability protection and can be more tax-efficient at higher income levels, but requires registering at Companies House, filing annual accounts, submitting a corporation tax return, and more.
The right structure depends on your income level, the nature of your work, and your risk exposure. A basic rule: sole trader until your profits are consistently above £30,000 to £40,000 per year, then review with an accountant. Below that level, the tax saving rarely justifies the extra admin.
A full guide to sole trader registration and the comparison with limited company structure is coming to /self-employed/sole-trader.
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Common questions about self-employment
How do I register as self-employed with HMRC?▾
Register online at GOV.UK. You will need a Government Gateway account. The registration takes around 10 minutes. Once registered, HMRC posts your Unique Taxpayer Reference (UTR) within a few weeks — you need this to file your Self Assessment returns. Register as soon as you start trading; do not wait until the 5 October deadline.
When is the deadline to register as self-employed?▾
You must register by 5 October in your second tax year of trading. The tax year runs from 6 April to 5 April. So if you started trading during 2025/26, the registration deadline is 5 October 2026. Register earlier — you need a UTR before you can file your return, and it takes several weeks to arrive.
What is a UTR number?▾
A Unique Taxpayer Reference is a 10-digit number HMRC uses to identify you for tax purposes. It appears on all HMRC correspondence and is required to file Self Assessment returns. You get it when you register for Self Assessment. It does not change. If you lose it, you can find it in your HMRC online account or by contacting HMRC.
Do I need to pay National Insurance if I'm self-employed?▾
Yes. Self-employed people pay Class 2 NI (a flat weekly rate — verify at GOV.UK) and Class 4 NI (on profits above the lower profits limit — verify rate and threshold at GOV.UK). Both count toward your state pension qualifying years. If your profits are below the small profits threshold, Class 2 is not due but you can pay voluntarily to protect your state pension entitlement.
What is the payments on account system?▾
When you file your first Self Assessment return, HMRC does not just collect the tax you owe. They also demand two advance payments toward next year's tax — each equal to 50% of your current year's bill. The first is due in January alongside your current year's tax. The second is due the following July. If your first bill is £4,000, HMRC asks for £6,000 in January. Budget for 150% of your expected annual tax bill in your first year.
Do I need to register for VAT?▾
You must register if your taxable turnover exceeds £90,000 in any rolling 12-month period — verify the current threshold at GOV.UK. Below that, registration is voluntary. Voluntary registration can make sense if most of your clients are VAT-registered businesses, or if you have significant VAT costs to reclaim. For most sole traders selling to consumers, it is not necessary until you hit the threshold.
What is the trading allowance?▾
The trading allowance lets you earn up to £1,000 from self-employment or trading in a tax year completely free of income tax and NI, without registering for Self Assessment. Once your income exceeds £1,000, you must register and declare it through Self Assessment. You cannot use the trading allowance and claim actual business expenses in the same year — it is one or the other.
What's the difference between self-employed and a limited company?▾
As a sole trader (self-employed), you and the business are the same legal entity. Your personal assets are at risk if the business incurs debts. A limited company is a separate legal entity — it offers personal liability protection and can be more tax-efficient at higher income levels. Running a limited company involves more administration: Companies House registration, annual accounts, corporation tax return. Most people start as sole traders and only consider a limited company when consistent profits reach £30,000 to £40,000 per year or above.