How you are paid and taxed, and which employment rights you have, both depend on your employment status -- but UK law recognises three different categories that do not always line up neatly with how a contract is labelled. Getting status wrong can leave a business exposed to backdated tax, National Insurance and tribunal claims, and can leave a worker without rights they assumed they had. This guide explains the three categories, the tests used to tell them apart, and how status interacts with IR35 in 2026/27.
The Three Categories of Employment Status
UK law recognises three broad statuses, and it is possible to be one for employment rights purposes and technically taxed differently -- status for tax and status for employment rights are assessed separately, though the underlying facts overlap heavily.
Employee: works under a contract of employment, gets the fullest set of rights (unfair dismissal, redundancy pay, statutory notice) and is taxed through PAYE.
Worker: a middle category with some rights (National Minimum Wage, paid holiday, protection from discrimination) but not the full employee package -- typically gig-economy and casual staff.
Self-employed: runs their own business, invoices for services, bears their own commercial risk, and has very limited statutory employment rights.
The Key Legal Tests
Tribunals and HMRC look past contract labels to the reality of the working relationship, using several long-established tests:
Control: how much say does the engager have over what, how, when and where the work is done?
Personal service and substitution: must the individual do the work personally, or can they send a substitute? A genuine, unfettered right of substitution strongly points away from employment.
Mutuality of obligation: is the engager obliged to offer work and the individual obliged to accept it? Genuinely casual, no-obligation arrangements point away from employee status.
Integration and other factors: whether the person is part and parcel of the organisation, provides their own equipment, bears financial risk, and can profit from sound management.
No single factor is decisive -- courts weigh the whole picture, and a written contract that does not reflect what actually happens in practice can be overridden by the facts.
Why Status Matters
Employment status drives two largely separate sets of consequences: employment rights, and tax treatment.
Rights: only employees get unfair dismissal protection (after qualifying service), statutory redundancy pay and full family leave rights. Workers get National Minimum Wage and holiday pay but not these. The genuinely self-employed get almost none of this.
Tax: HMRC applies its own employment status test for tax purposes, largely mirroring the employment-law tests, to decide whether PAYE and employer National Insurance should apply, or whether the person can be paid gross as self-employed or through their own company under IR35 rules.
HMRC’s CEST Tool and IR35
For engagements through personal service companies, HMRC provides the Check Employment Status for Tax (CEST) tool to help engagers and contractors assess whether IR35 (off-payroll working) rules apply. CEST gives HMRC-backed reassurance when used accurately and the result is kept as evidence, but it does not cover every scenario and can return an "unable to determine" result in genuinely borderline cases.
CEST assesses status for the purpose of the intermediary rules specifically -- it is a proxy for the underlying employment status tests, applied to whether the fee-payer should deduct tax and NI as if the contractor were an employee of the end client.
Frequently Asked Questions
What is the difference between a worker and an employee?
An employee works under a contract of employment and receives the full range of statutory rights, including unfair dismissal protection and redundancy pay once qualifying service is reached. A worker has a more limited contract -- often more casual or gig-based -- and is entitled to National Minimum Wage, paid holiday and whistleblowing protection, but not unfair dismissal or redundancy rights.
Can my contract just say I am self-employed to avoid giving me rights?
No. Tribunals and HMRC look at the reality of the working relationship, not just the label used in a contract. If the actual working arrangements match those of an employee or worker -- for example, genuine personal service, close control, and no real right of substitution -- a court can find employee or worker status regardless of what the paperwork says.
What is mutuality of obligation?
Mutuality of obligation is whether the engager is obliged to provide work and the individual is obliged to accept it. In a typical employment relationship this mutual obligation continues between assignments. In a genuinely casual arrangement -- where each engagement is separately agreed and either side can decline without penalty -- mutuality is weaker, pointing away from employee status.
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What is a substitution clause and why does it matter?
A substitution clause allows the individual to send someone else to do the work instead of doing it personally. If the right is genuine, unrestricted (not just needing the engager’s prior approval of a like-for-like replacement in name only) and has actually been used or would realistically be permitted, it strongly indicates self-employment, since personal service is a core requirement of employee and worker status.
Is CEST legally binding?
HMRC will stand by a CEST result as long as the information entered accurately reflects the actual working arrangements and is kept as a record. If the facts change, or the answers given do not match reality, HMRC is not bound by an inaccurate result, so accuracy when completing CEST is essential.
How does employment status affect tax and National Insurance?
Employees have Income Tax and Class 1 National Insurance deducted through PAYE by their employer, who also pays employer NI. Self-employed people pay Income Tax and Class 4 NI through Self Assessment, with no employer NI involved. For contractors working through their own company, IR35 status determines whether the fee-payer must apply PAYE-equivalent deductions despite payments being made to the company.
Can I be an employee for tax purposes but not for employment rights, or vice versa?
In principle yes, because employment-rights status and tax status are assessed under separate (though similar) legal frameworks by different bodies -- employment tribunals for rights, HMRC and tax tribunals for tax. In practice the outcomes usually align closely because both apply broadly similar control, personal service and mutuality tests, but discrepancies can occur.
What should I do if I think I have been wrongly classed as self-employed?
Gather evidence of how the work actually operates in practice -- your level of control, whether you can send a substitute, whether you are obliged to accept work offered, and how integrated you are into the organisation -- and consider seeking advice from ACAS, a solicitor, or your union before raising a claim, as bringing an employment tribunal claim is usually subject to strict time limits.
Does gig economy work automatically mean self-employed status?
No. Several high-profile tribunal and Supreme Court cases have found gig-economy platform workers to be "workers" (not self-employed) despite platform contracts describing them as independent contractors, because of the degree of control the platform exercised and the lack of a genuine substitution right. Each case still depends on its specific facts.
Who decides my employment status if there is a dispute?
For employment rights, an employment tribunal makes the final decision if the matter is litigated. For tax, HMRC makes an initial determination which can be challenged and, if unresolved, appealed to the tax tribunals. Both apply broadly similar tests, but they are separate legal processes and can, in rare cases, reach different conclusions on the same facts.
Disclaimer: This guide reflects UK employment status law and HMRC practice as they apply in 2026/27. This guide is for general information only and is not professional advice. Consult a qualified adviser and refer to gov.uk for current official guidance before relying on any treatment.
