Employee vs worker vs contractor in the United Kingdom
Reviewed by Mellow Editorial Team, HR & payroll content team
Classifying the people who work for you correctly is one of the most consequential decisions you make as an employer. Get it wrong and you face back-payments of tax, National Insurance and holiday pay, plus potential tribunal claims.
Why the distinction matters
Employment status determines what rights a person holds, what taxes apply and who bears the cost of errors. HMRC, employment tribunals and pension regulators each apply their own tests, and they do not always reach the same conclusion. A contractor classified as self-employed for tax purposes can still be found to be a worker for employment rights purposes — these are parallel questions, not the same question.
The three main categories in UK law are employee, worker and independent contractor (self-employed). Each carries a different bundle of rights and obligations.
Employees
An employee works under a contract of employment, which can be written, verbal or implied by conduct. The key indicators are:
- Mutuality of obligation — you are obliged to offer work and they are obliged to accept it.
- Personal service — they must do the work themselves and cannot send a substitute without your agreement.
- Control — you direct how, when and where the work is done, not just what outcome is required.
Employees have the fullest set of rights. These include statutory annual leave of 5.6 weeks (28 days including bank holidays for a five-day week), Statutory Sick Pay, family leave, and protection from unfair dismissal once they have two years' continuous employment. Under the Employment Rights Act 2025, the unfair dismissal qualifying period will reduce to six months for dismissals on or after 1 January 2027, so now is a sensible time to review how you manage performance and conduct during the early months of employment.
Employees also have day-one rights introduced or confirmed by the ERA 2025: the right to request flexible working from the first day, day-one Statutory Sick Pay (no waiting days — this takes effect from April 2026), and day-one eligibility for paternity and unpaid parental leave.
For payroll, employees are processed through PAYE. You deduct income tax (20% basic rate, 40% higher rate, 45% additional rate above the relevant thresholds, with a personal allowance of £12,570) and employee National Insurance at 8% up to the upper earnings limit and 2% above it. You also pay employer NI at 13.8%. Auto-enrolment pension contributions apply — a minimum of 3% from you and 5% from the employee on qualifying earnings.
Workers
The worker category sits between employee and self-employed. A worker has a contract — again, not necessarily written — to perform work personally for an organisation that is not their client or customer. The critical difference from employment is that mutuality of obligation is weaker or absent: a worker may have no guaranteed hours and you have no obligation to offer them.
Workers are entitled to:
- Statutory annual leave and holiday pay
- National Minimum Wage / National Living Wage
- Rest breaks and working time protections
- Whistleblowing protection
- Auto-enrolment pension rights
Workers do not have unfair dismissal protection or the full suite of family leave rights that employees hold. Many gig economy and casual staff fall into this category.
For tax, most workers will still be processed through PAYE in practice, particularly if they work regularly for you. Zero-hours and casual arrangements that create worker status can catch employers out when they have been treating people as self-employed.
Independent contractors
A genuinely self-employed contractor operates their own business, takes on financial risk, can send a substitute, and works for multiple clients. They invoice for services rather than receiving a wage. You do not run PAYE for them, you do not pay employer NI on their fees, and they manage their own tax returns.
The practical risk here is IR35 (the off-payroll working rules). If a contractor provides services through a personal service company but the working arrangement would, in substance, look like employment if the company were removed from the picture, HMRC may treat the income as employment income. In the private sector, medium and large businesses that engage contractors through intermediaries are responsible for making the IR35 determination. Getting this wrong can lead to significant back-tax liabilities.
How to assess status in practice
No single factor is decisive. You should look at the overall picture:
- Substitution: can the individual genuinely send someone else to do the work?
- Control: who decides how the work is performed day-to-day?
- Integration: does the person look and function like part of your workforce?
- Financial risk: do they bear any risk of loss, provide their own equipment, or quote fixed prices?
- Exclusivity: are they prohibited from working for others?
Document your reasoning at the point of engagement and revisit it if circumstances change. A contractor who started on a discrete project but has been working exclusively for you for two years is a different proposition from where they started.
A note on this guidance
The boundaries between categories are genuinely contested, and the case law continues to develop. This article is general information, not legal advice. Where the classification of a specific individual is uncertain, take advice from an employment lawyer or a qualified HR professional before you engage them or before you make any changes to their current arrangement.
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