Deciding whether someone working for your business is an employee, a worker, or a self-employed contractor is one of the most important classification decisions you will make. Get it right and everyone knows where they stand. Get it wrong and you could face back-dated tax bills, employment tribunal claims, and penalties from HMRC.
This guide explains the three employment statuses in UK law, the tests used to determine which applies, the IR35 off-payroll working rules, and what you should do to protect your business.
The three employment statuses
UK employment law recognises three categories, each with different rights, obligations, and tax treatment.
Employee
An employee works under a contract of employment. They have the fullest set of statutory rights, including protection from unfair dismissal, redundancy pay, the right to request flexible working, maternity and paternity leave, and statutory notice periods. Employees pay income tax and National Insurance through PAYE.
Worker
A worker has a contract to perform work personally but is not in business on their own account. Workers have fewer rights than employees but are entitled to NMW, paid holiday, rest breaks, protection from discrimination, and whistleblowing protection. Agency staff, some casual workers, and gig economy participants often fall into this category.
Self-employed contractor
A genuinely self-employed person runs their own business and provides services to clients under a contract for services. They have very few employment rights and are responsible for their own tax, NICs, and insurance.
The critical word here is "genuinely." Calling someone self-employed in a contract does not make them self-employed in law. The courts and HMRC look at the reality of the working relationship, not just the paperwork.
Key legal tests
When a dispute arises over employment status, tribunals apply several established tests.
Mutuality of obligation. Is the employer obliged to offer work, and is the individual obliged to accept it? If yes on both counts, this points strongly towards employment. A genuinely self-employed contractor can turn down work without consequence.
Control. How much control does the business have over what the individual does, how they do it, when, and where? The more control the business exercises, the more likely the relationship is one of employment.
Personal service. Must the individual do the work personally, or can they send a substitute? A genuine right of substitution (where the contractor can send a qualified replacement without the client's approval) is one of the strongest indicators of self-employment.
Integration. Is the individual integrated into the business? Having a company email, appearing on the internal directory, attending staff meetings, and being subject to the same policies as employees all suggest employment.
Financial risk. Does the individual invest in their own equipment, carry their own insurance, and risk making a profit or a loss? Bearing financial risk points towards self-employment.
No single factor is decisive. Tribunals assess the overall picture, weighing all the relevant circumstances.
IR35: The off-payroll working rules
IR35 prevents individuals from avoiding tax by working through an intermediary (usually a personal service company) when the reality of the relationship is one of employment.
Since April 2021, medium and large private sector businesses are responsible for determining the employment status of contractors working through intermediaries. If IR35 applies, the business or agency paying the contractor must deduct income tax, employee NICs, and pay employer NICs.
Small businesses (those not meeting two of: turnover above £10.2 million, balance sheet above £5.1 million, more than 50 employees) are exempt. The contractor's personal service company remains responsible for status and tax.
HMRC's CEST tool
HMRC provides the Check Employment Status for Tax (CEST) tool to help determine whether IR35 applies. It is a useful starting point but has limitations. Its results are not binding on tribunals, and for borderline cases, professional advice is recommended.
Risks of getting classification wrong
Tax liability. If HMRC determines someone you treated as self-employed should have been on payroll, you could face back-dated income tax, NICs, interest, and penalties going back up to six years (or 20 years for deliberate non-compliance).
Employment rights claims. A misclassified contractor found to be an employee or worker may claim back-dated holiday pay, notice pay, pension contributions, and other statutory benefits. They could also bring claims for unfair dismissal or discrimination. The cost of defending a tribunal claim is significant even when the employer wins.
Reputational damage. High-profile employment status cases have shown that misclassification attracts public criticism. Even smaller businesses can suffer reputational harm if former contractors bring claims.
Practical steps for SMEs
1. Review existing contractor arrangements
Look at every individual currently engaged on a self-employed basis. For each one, ask: could this person realistically be an employee or worker? If there is any doubt, seek professional advice before HMRC or a tribunal makes the determination for you.
2. Use written contracts that reflect reality
Your contracts should accurately describe the working relationship. A contract that says "the contractor may send a substitute" is meaningless if you would refuse substitution in practice. Make sure the written terms match what happens day to day.
3. Complete right to work checks
Regardless of employment status, carry out right to work checks on anyone providing services to your business.
4. Document your status determination
For each contractor engagement, work through the key tests and document your reasoning. Medium and large businesses are legally required to provide a Status Determination Statement before the engagement starts.
5. Keep arrangements under review
Employment status is not a one-off determination. If a contractor who started on a defined project begins doing ongoing work under your direction, the status may change. Review arrangements regularly.
What is changing
The Employment Rights Act 2025 does not fundamentally change the employment status framework, but several provisions increase the stakes. The shorter unfair dismissal qualifying period, the removal of the compensation cap, and the extended tribunal time limits all mean that misclassifying someone who should be an employee carries greater potential liability than before.
The government has also indicated it intends to simplify the status framework in the longer term, potentially moving towards a two-tier system. This has not been legislated yet but is worth monitoring.
How Rebox HR can help
Employment status is a technical area where the cost of getting it wrong far outweighs the cost of getting proper advice. Whether you need to review existing contractor arrangements, draft compliant contracts, or work through a status determination, we can guide you through the process.
Our ad-hoc HR services are well suited to one-off status reviews, while our retained HR support clients receive ongoing guidance on classification issues.
Book a free consultation to discuss your situation, or call us on 01327 640070.
