Contractors or Employees: Getting the Distinction Right

Tom joined Nadia’s design studio in Leeds as a freelance developer for a three-month project. Two years later he was still there, working every Monday to Wednesday, using a studio laptop and email address, sitting in every team meeting and sending the same invoice each month. Nobody had thought about it, until Tom mentioned he had never had a paid holiday. That one comment made Nadia realise the line between contractors vs employees is not set by what you call someone. It is set by how the work really happens.

	Employee	Worker	Self-employed
Paid through PAYE	Yes	Usually	No, invoices
Minimum wage and holiday pay	Yes	Yes	No
Statutory sick pay	Yes, from day one (2026)	Often	No
Unfair dismissal protection	Yes, after qualifying period	No	No
Can send a substitute	No	No	Usually yes

The label on the contract does not decide

Many owners believe that if the contract says “self-employed contractor”, that settles it. It does not. Courts and tribunals look at what actually happens day to day, and they will ignore wording that does not match reality. The Supreme Court made this very clear in the 2021 Uber case, where drivers described as independent were found to be workers entitled to the minimum wage and holiday pay. A good written agreement still matters, because it shows what both sides intended, but it only helps if the working relationship really looks like that. Our guide to business contracts covers what to put in writing.

Three categories, not two

For employment rights, UK law has three categories. Employees have the full set of rights: holiday, sick pay, notice, redundancy pay and protection from unfair dismissal. Workers sit in the middle, with rights to the minimum wage, paid holiday, rest breaks and pension auto-enrolment, but not unfair dismissal. The self-employed run their own business and have almost none of these rights. Tax is judged separately by HMRC, so someone can be a worker for employment law and still pay tax as self-employed. That middle category catches many small firms out. A regular casual helper who cannot send someone else in their place is often a worker, even if they invoice you.

The tests that really matter

No single test decides status, but a few questions carry most of the weight. Control: do you decide how, when and where the work is done, or just what result you need? Personal service: can they send a qualified substitute without your permission, and have they ever done so? That is one of the strongest signs of genuine self-employment. Mutual obligation: are you expected to offer work and are they expected to accept it? And integration: do they look like part of your team, with your email, kit and job title? In Tom’s case every answer pointed the same way. He had drifted from a contractor into something that looked a lot like an employee.

Tax status and the off-payroll rules

When a contractor works through their own limited company, the off-payroll rules, often called IR35, apply. If your business is medium or large, you must decide their status yourself and give them a written status determination; if they are really employees in disguise, tax and National Insurance must be deducted. Small clients are exempt, and the contractor’s company decides instead. A company is small if it meets two of three tests. Those limits are rising to £15 million turnover and £7.5 million on the balance sheet, with 50 employees unchanged, but because the test looks at the previous year’s accounts, most firms will only feel the change from April 2027. HMRC’s free CEST tool gives a quick first view. Our guide to sole trader or limited company explains the contractor side.

Agencies and umbrella companies

Using a recruitment agency does not make the question go away. Many agency contractors are paid through an umbrella company, which employs them and runs PAYE. Some umbrella firms have run tax avoidance schemes that left the tax unpaid. Since 6 April 2026, the agency that deals directly with the end client can be held jointly liable for an umbrella company’s unpaid PAYE and National Insurance; if there is no agency, that liability can fall on the business using the worker. So if you hire through an agency, ask which umbrella companies are in the chain and how they are checked. If a pay offer looks too good to be true, with take-home pay far higher than normal PAYE would allow, treat it as a warning sign.

What getting it wrong costs

Misclassifying someone is expensive because the bill is backdated. HMRC can usually look back four years, six if you were careless and twenty if the error was deliberate, and it will want the income tax and National Insurance that should have been paid, plus interest and penalties. On top of that, a worker or employee can claim holiday pay, minimum wage arrears and pension contributions they missed. Since April 2026 the new Fair Work Agency has been enforcing holiday pay, the minimum wage and statutory sick pay, so this is no longer something only individual workers chase. Build a sensible reserve into your cash flow forecast if a review turns up a problem.

The real cost comparison

Contractors look expensive per day, and employees look cheap per hour. Neither is quite true. An employee costs their salary plus employer National Insurance at 15% on pay above £5,000 a year, pension contributions, 5.6 weeks’ paid holiday and, since April 2026, sick pay from the first day of absence. The National Living Wage is £12.71 an hour for those aged 21 and over. Against that, most small firms can claim the £10,500 Employment Allowance. A genuine contractor costs only their rate, but you get no loyalty, less control and no guarantee they will be free next month. Our guide to the cost of hiring your first employee runs the full numbers.

Signs a contractor has drifted

Status problems rarely start on day one. They creep in. Watch for someone who has worked for you continuously for more than a year, works set days or hours you decide, uses your equipment and email address, appears on your team page or organisation chart, has a manager rather than a client contact, or does ongoing work instead of defined projects. Tom ticked every box. Review any contractor arrangement before each renewal rather than letting it roll on. A short, honest look at how the work really happens, once a year, is far cheaper than defending it later. The same applies as you grow, which we cover in growing from sole trader to team.

How to keep a genuine contractor genuine

If you want a real contractor relationship, run it like one. Agree deliverables and a price or day rate for each piece of work, not open-ended hours. Let them choose how and when to do it within reasonable deadlines. Expect them to use their own equipment, carry their own insurance and work for other clients. Allow a genuine right to send a substitute. Keep them out of staff processes such as appraisals and holiday requests. Your health and safety duties still cover them on your premises, as our guide to health and safety for small businesses explains. For the practical side of finding and briefing people, see working with freelancers.

What Nadia did

Nadia talked it through with her accountant and then with Tom. He was happy to become an employee: three days a week, paid holiday, a pension and sick pay. The studio paid a modest amount of backdated holiday pay to settle things fairly. Her two other contractors, who work on defined projects for several clients, stayed as they were, with clearer written agreements. The contractors vs employees question is not about which is cheaper on paper. It is about matching the label to reality, and checking it every year before it quietly drifts again.

Frequently asked questions

What is the difference between a contractor and an employee?

Employees work under your control with full employment rights. Genuine contractors run their own business, choose how to work and can often send a substitute.

Does a self-employed contract make someone self-employed?

No. Tribunals and HMRC look at how the work really happens. If the reality looks like employment, the contract wording will be ignored.

What is a worker in UK employment law?

A middle category entitled to the minimum wage, paid holiday and pension auto-enrolment, but not protection from unfair dismissal.

Do IR35 rules apply to small businesses?

Small clients are exempt from deciding status under the off-payroll rules. The contractor’s own company makes the decision instead.

How far back can HMRC go if I get status wrong?

Usually four years, six years if you were careless and up to twenty years if the error was deliberate, plus interest and penalties.

What changed for umbrella companies in April 2026?

Agencies dealing directly with the end client, or the client itself if there is no agency, can now be liable for unpaid umbrella PAYE.

This article is general information about the position in Great Britain in September 2026, not legal or tax advice. Employment status depends on the full facts of each relationship. Check HMRC and ACAS guidance or take advice before changing how someone is engaged.