Employee, worker or self-employed: getting employment status right

Almost every employment dispute a small business ends up in starts with the same misunderstanding: that calling someone self-employed makes them self-employed. It does not. UK employment status is determined by how the relationship actually works day to day, and a tribunal or HMRC will happily look straight past a contract that describes something different from what was really going on.

The stakes are not trivial. Get it wrong and you can be liable for years of unpaid holiday, back-dated minimum wage, unpaid employer National Insurance, pension contributions and penalties — usually all arriving at once, because the person who challenges their status is rarely doing it while things are going well.

Three categories, not two

The category most owners have never heard of is the one that catches them.

Employee. The full set of rights. Works under a contract of employment, expected to turn up, cannot send someone else, and the business decides what is done and largely how.

Worker. The middle category, and by far the most misapplied. A worker undertakes to do the work personally, but there is no ongoing obligation on the business to offer work or on them to accept it. Casual staff, most zero-hours arrangements, many agency workers, and a great many people invoicing as self-employed sit here in law.

Self-employed. Genuinely in business on their own account. They carry the financial risk, can profit from doing the job more efficiently, use their own equipment, work for others, and can send a substitute.

The three tests that decide it

Personal service. Must this individual do the work themselves? A genuine, unfettered right to send a competent substitute — one actually used, or one you would actually accept — points strongly to self-employment. A right to substitute that requires your approval, or that nobody has ever exercised because everybody knows you would refuse, counts for very little.

Control. Who decides what is done, how, when and where? A tradesperson told which site, which hours and which method is being controlled. One given an outcome and a deadline is not.

Mutuality of obligation. Are you obliged to offer work, and are they obliged to take it? Where the answer to both is yes, you are usually looking at employment. Where neither party owes the other anything between jobs, employment is unlikely — though worker status may still apply to each individual engagement.

Beyond those three, tribunals weigh financial risk, who provides the equipment, whether the person works for others, integration into the business, and whether they look to the outside world like part of your team.

If someone has been on your rota for two years, uses your van, wears your logo and has never once sent anyone else, the word on their invoice is not going to help you.

What each status actually costs you

Workers, not just employees, are entitled to the National Minimum Wage, 5.6 weeks of paid holiday a year, rest breaks, protection from unlawful deductions from wages, whistleblowing protection and protection from discrimination. From April 2026 the National Living Wage for those aged 21 and over is £12.71 an hour, with £10.85 for 18 to 20 year olds and £8.00 for 16 and 17 year olds.

Employees get all of that plus unfair dismissal protection, statutory redundancy pay, statutory sick pay, family leave rights and TUPE protection when work transfers. Genuinely self-employed contractors get none of it — which is exactly why misclassification is expensive.

Put figures on it. Someone paid £14 an hour for 20 hours a week, engaged as self-employed for two years, who is later found to be a worker: holiday alone is 5.6 weeks of their average weekly pay, so roughly £280 a week for about £1,568 a year, or over £3,100 across two years, plus employer pension contributions and any minimum wage shortfall once unpaid preparation or travel time is counted. For one part-timer. Multiply by a team of six casual staff and it becomes an existential number rather than an annoyance.

Tax status is a separate question

This trips up even careful owners. Employment law status and tax status are decided under different rules by different bodies. It is entirely possible to be a worker for employment law purposes and self-employed for tax, or an employee for tax and not for employment rights.

Where someone provides services through their own limited company, the off-payroll rules apply instead, which is a different test with a different set of consequences — covered in IR35 in plain English. HMRC's own status tool gives an indicative answer for tax and is worth running and saving, but it does not determine employment rights, and a printout will not stop a tribunal reaching its own conclusion.

What to do about it this week

Take the list of everyone who works for you but is not on payroll and ask three questions about each: could they send someone else tomorrow and would you accept it; do you tell them when and how to work; do you offer regular work that they are expected to take. Two or three yeses and you should assume worker status at minimum.

Then fix the ones that are wrong, before someone else does it for you. That usually means moving them onto payroll properly, or genuinely changing the arrangement — real flexibility, real substitution, no rota. What does not work is redrafting the contract while nothing about the working relationship changes, because the contract was never what decided it. If the answer is to bring them onto payroll, the written statement they must receive on day one is the place to start, and employers' liability insurance needs to be in place before their first shift.

Common questions

What is the difference between a worker and an employee?

Both must do the work personally, but an employee works under an ongoing contract of employment with a mutual obligation to offer and accept work, while a worker has no such continuing obligation between engagements. The practical difference is in rights: workers get the National Minimum Wage, 5.6 weeks of paid holiday, rest breaks, protection from unlawful deductions and protection from discrimination. Employees get all of that plus unfair dismissal protection, statutory redundancy pay, statutory sick pay, family leave and TUPE protection. Most casual, bank and zero-hours staff are workers, and treating them as self-employed is the single most common status error in UK small businesses.

Can I just put in the contract that someone is self-employed?

No. Employment status is determined by the reality of the working relationship, and both tribunals and HMRC will look behind the paperwork to what actually happens. A written label is one piece of evidence and a weak one, particularly where the contract was drafted by you and presented on a take-it-or-leave-it basis. If the individual works set hours, cannot realistically send a substitute, uses your equipment and is integrated into your team, they will be found to be a worker or employee whatever the document says. The way to achieve genuine self-employment is to run the relationship differently, not to describe it differently.

What happens if I have classified someone wrongly?

The exposure is usually backdated rather than forward-looking, which is what makes it painful. You can face claims for unpaid holiday pay, minimum wage shortfalls, and unlawful deductions, plus HMRC liability for unpaid income tax, employee and employer National Insurance, and automatic enrolment pension contributions, with interest and penalties. Holiday pay claims in particular can reach back over an extended period. If you suspect a misclassification, take advice before you act, because how you correct it — and whether continuous service is treated as having already begun — affects both the cost and any later unfair dismissal exposure.

Does using HMRC's status checking tool protect me?

Partly, and only for tax. HMRC will stand behind the result its Check Employment Status for Tax tool produces provided the information entered was accurate and reflects actual working practice, so keeping a dated printout with your records is worthwhile. It does not determine employment rights: a tribunal deciding a holiday pay or unfair dismissal claim applies employment law tests and reaches its own conclusion regardless of what the tool said. Run it, save it, and treat it as covering one half of the question. The employment law half needs the same three tests applied honestly to how the work is really done.