“Am I employed or self-employed?” is the question that sits underneath almost every other UK tax question. Your answer decides which National Insurance you pay, which expenses you can claim, which return you file, and whether tax is taken off you before you see it or you settle up with HMRC once a year.
The problem is that the answer isn’t always obvious. You can be a “worker” with minimum-wage rights but still self-employed for tax. You can run your business through a limited company and be treated as an employee for a specific contract. You can work in construction and have tax deducted from your invoices before you’re paid, even though you’re self-employed.
This hub maps the framework — the legal categories, the tests HMRC applies, and how status flows through to your NI, expenses, and returns — then links out to the detailed guides for the specific situations (IR35, gig work, CIS) where the rules get more granular.
What Is Employment Status for Tax?
Employment status for tax is HMRC’s classification of how you work: employed, self-employed, or a worker. It decides which National Insurance you pay, which expenses you can claim, which tax return you file, and whether tax is collected through PAYE or Self Assessment. HMRC applies common-law tests built around three factors — control, substitution, and mutuality of obligation — and no single factor is decisive; the overall picture of the working relationship determines your status.
1. The Three Legal Categories: Employed, Self-Employed, and Worker
UK law recognises three broad categories, and the boundaries between them are where most of the confusion lives.
Employed means you work under a contract of service for one employer, who controls how, when, and where you work, provides your equipment, pays you a regular salary through PAYE, and gives you holiday pay, sick pay, and other employee rights. Your employer deducts Income Tax and National Insurance before you’re paid.
Self-employed means you run your own business — you’re in business on your own account. You invoice for your work, bear your own costs and risk, can work for multiple clients, and you’re responsible for declaring your income and paying your own tax through Self Assessment. You don’t get employee rights, but you get autonomy and the ability to claim business expenses.
Worker is a third, in-between category created by employment law. Workers get some rights — minimum wage, holiday pay, pension auto-enrolment — but not the full set an employee gets. The crucial point for tax: most workers are still self-employed for tax purposes. The Uber and Deliveroo Supreme Court cases gave drivers and riders “worker” rights, but they still file Self Assessment and pay their own tax. Employment status for rights and employment status for tax are two separate legal questions, and they don’t always give the same answer.
If you work through a platform like Deliveroo or Uber and you’re unsure which side of this line you fall on, see our gig economy tax guide for the full breakdown.
2. The Status Tests: Control, Substitution, and Mutuality of Obligation
HMRC doesn’t just take your word for it. When deciding whether someone is genuinely self-employed or a disguised employee, it applies tests drawn from decades of case law. Three factors do most of the work.
Control — how much say does the client have over how, when, and where you do the work? A genuine self-employed person controls their own methods and schedule. An employee is told what to do, when to do it, and how.
Substitution — do you have the right to send a suitable substitute to do the work in your place, and could you actually do so? This is one of the strongest indicators of self-employment. If you personally must do the work and cannot delegate, that points towards employment.
Mutuality of obligation (MOO) — is the client obliged to offer you work, and are you obliged to accept it? In genuine self-employment, neither side is bound: the client doesn’t have to keep giving you work, and you don’t have to take it. An ongoing expectation of work in both directions is a hallmark of employment.
No single factor is decisive. HMRC looks at the overall picture, weighing other indicators like financial risk, who provides equipment, how integrated you are into the client’s business, and whether you’re paid a regular salary or invoice for project-based fees. The same tests apply whether you trade as a sole trader or through a limited company — the IR35/off-payroll rules apply the same case-law framework, just from the angle of someone working through an intermediary.
For how these tests play out when you’re a sole trader being scrutinised by HMRC, see our IR35 and sole traders guide.
3. Sole Trader vs Limited Company vs Umbrella: Choosing Your Structure
Once you know you’re self-employed, you have to choose how to trade. The three main options — sole trader, limited company, and umbrella company — carry very different tax, liability, and admin consequences. The right choice depends on your profit level, whether you need to draw all of it, your clients’ attitudes to IR35, and whether you need limited liability protection.
For the full comparison — including 2026/27 tax rates, take-home pay at different profit levels, the break-even analysis, admin costs, and how to incorporate — see our dedicated sole trader or limited company guide. The key shift in 2026/27: the dividend tax rise to 10.75%/35.75%, employer NI from £5,000, and Class 4 NI at 6% have largely closed the old tax gap, so the decision now turns on liability and admin rather than tax savings alone.
4. How Your Status Changes Your National Insurance
National Insurance is where employed and self-employed status diverge most clearly, and it’s an interaction layer none of the spokes cover on its own.
Employees pay Class 1 NI: 8% on earnings between £12,570 and £50,270, and 2% above that, deducted by the employer through PAYE. The employer also pays secondary NI on top.
Self-employed people pay Class 4 NI on profits: 6% on profits between £12,570 and £50,270, and 2% above that, paid through Self Assessment. Class 2 NI was abolished, so there’s no longer a flat-rate weekly contribution. The self-employed rate is lower than the employee rate, which is part of why HMRC scrutinises status — the Exchequer loses NI when someone is reclassified from employed to self-employed.
If you trade through a limited company and take a small salary plus dividends, you pay Class 1 NI on the salary element only, and no NI on dividends. This is one of the tax-efficiency levers of the company route, but it’s also why HMRC watches dividend/salary splits closely.
If you work in construction as a CIS subcontractor, you’re self-employed and pay Class 4 NI on your profits — but you also have 20% deducted from your labour income at source, which is set against your overall tax and NI bill when you file. See our CIS for subcontractors guide for how the deduction and refund cycle works.
5. How Your Status Changes Your Expenses and Allowances
Status drives what you can deduct, and the rules are not symmetric.
Employees can claim very little — only specific, HMRC-approved expenses (like professional subscriptions or travel to a temporary workplace), and only if their employer doesn’t reimburse them. Most everyday work costs are not deductible for employees.
Self-employed people can deduct any expense that is wholly and exclusively for the purposes of the trade — a much wider net. This includes equipment, software, travel, phone, a portion of home running costs if you work from home, and capital allowances on bigger purchases like a vehicle or computer. The £1,000 trading allowance is an alternative to claiming actual expenses: if your costs are under £1,000, take the allowance; if they’re over, claim actual expenses. You can’t do both. Use our trading allowance calculator to see which method saves you more.
Limited company directors have the widest range of options — the company can pay for equipment, vehicles (through capital allowances), pensions (with Corporation Tax relief), and even some benefits — but benefits in kind like private medical insurance trigger a P11D charge and employer NI. The trade-off is more deductible scope, but more reporting.
For the trading allowance decision and the wholly-and-exclusively rule in detail, see our trading allowance vs expenses guide. For car expenses specifically (mileage vs actual costs), see our car expenses for sole traders guide.
6. Which Tax Return You File Depends on Your Status
This is the most visible difference, and the one most people notice first.
If you’re employed, you generally don’t file a tax return at all. Your employer handles PAYE, and your tax code collects the right amount each month. You only file a Self Assessment if you have additional circumstances — income over £100,000, self-employment income over £1,000, rental income, or a benefit in kind that isn’t coded out.
If you’re self-employed with gross income over £1,000, you must register for Self Assessment and file a tax return each year, reporting your income and expenses and paying your own tax and NI by 31 January. From April 2026, if your qualifying income is over £50,000, you’ll also send quarterly updates under Making Tax Digital — see our MTD for income tax guide for what that involves.
If you trade through a limited company, the company files its own Corporation Tax return and accounts with Companies House, and you file a personal Self Assessment for your salary and dividends. That’s two layers of filing rather than one.
If you’re a CIS subcontractor, you file a Self Assessment like any sole trader, but you also reconcile the 20% deductions that contractors have already paid to HMRC on your behalf — most subcontractors get a refund because the deduction ignores expenses and the Personal Allowance.
7. IR35 and Off-Payroll: When Limited-Company Contractors Look Like Employees
IR35 (the Intermediaries legislation) is the rule that catches limited-company contractors who would be employees if they worked directly for the client — for the full framework, see our IR35 and sole traders guide. It doesn’t apply to sole traders (there’s no intermediary), but the underlying status tests are the same ones described in section 2.
Since the 2021 off-payroll reforms, the end client (or the fee-payer in the chain) decides whether a contract is inside or outside IR35, and if inside, operates PAYE on the payment. From April 2026, the thresholds that determine whether a client is “small” (and therefore exempt from the reforms) increased, so more clients fall outside the regime — but ordinary employment status rules still apply to sole traders regardless.
8. Gig Work: Self-Employed for Tax Even With Worker Rights
Gig economy workers — Deliveroo riders, Uber drivers, Just Eat couriers — are self-employed for tax purposes, even though many have won “worker” status in the courts. You file a Self Assessment, pay your own tax and NI, and can claim expenses like fuel, bike repairs, and phone costs; for the full breakdown of when to file and what to claim, see our gig economy tax guide.
The £1,000 trading allowance applies: earn under that and you generally don’t need to file; earn over it and you must register. From January 2024, digital platforms must report sellers’ income to HMRC automatically, so undeclared gig income is increasingly likely to be flagged.
9. Construction and CIS: Tax Deducted Before You’re Paid
Construction is the one industry where the self-employed have tax collected at source, like employees do through PAYE. Under the Construction Industry Scheme, contractors deduct 20% from the labour element of a subcontractor’s invoice (30% if unregistered, 0% with gross payment status) and pay it to HMRC — for registration, gross status, and the refund process, see our CIS for subcontractors guide.
You then reclaim the deduction through your Self Assessment, and because the 20% ignores your expenses and Personal Allowance, most subcontractors get a refund. CIS doesn’t change your self-employed status; it’s a collection mechanism layered on top of it. From April 2026, CIS subcontractors with qualifying income over £50,000 also send quarterly updates under MTD, on top of the contractor’s monthly CIS returns.
10. How to Check Your Status: CEST and Getting It Right
If you’re unsure where you sit, HMRC’s free Check Employment Status for Tax (CEST) tool gives HMRC’s view based on the information you enter. It covers both IR35/off-payroll engagements and direct sole-trader engagements, and it’s the starting point most people should use.
CEST has limits: it’s only as accurate as your inputs, the language can be hard to map onto certain types of work, and it doesn’t cover every sector-specific nuance. Treat it as one signal among several. For complex or borderline cases — particularly if a single engagement is high-value or a client is asking for a status determination — get advice from an IR35 specialist or a body like IPSE.
For how to use CEST as a sole trader and what to do if your status is questioned, see our IR35 and sole traders guide. If you’re registering as self-employed for the first time, our first-year self-employed checklist walks you through the process.
The Bottom Line
- There are three legal categories — employed, self-employed, and worker — and they don’t always line up the same way for tax as they do for employment rights.
- HMRC applies three core tests — control, substitution, and mutuality of obligation — and looks at the overall picture rather than any single factor.
- Your structure matters: sole trader is simplest, limited company can be more tax-efficient at higher profits but carries IR35 risk, and umbrella trades tax efficiency for simplicity and employee rights.
- Status drives your National Insurance — self-employed people pay Class 4 (6%) instead of Class 1 (8%), and limited-company directors pay NI only on salary, not dividends.
- Status drives your expenses — the self-employed can deduct anything wholly and exclusively for the trade, far wider than employees.
- Status drives your return — employees usually file nothing, the self-employed file Self Assessment, company directors file both a company return and a personal one, and CIS subcontractors reconcile deductions on their Self Assessment.
- IR35, gig work, and CIS are specific applications of the same status framework — each has its own guide linked above.
- Use CEST as a starting point, but get professional advice for high-value or borderline engagements.
For the full jargon buster, see our jargon index. If you’re new to self-employment, start with our starting out as self-employed guide or the first-year self-employed checklist. For how the £1,000 trading allowance interacts with your expenses, see our trading allowance guide. If you’d rather have someone handle your tax return, compare your options in our Self Assessment help section.