Single worker status: what it means for your workforce
Employment status in the UK currently has three categories: employee, worker, and self-employed. The distinction matters enormously — employees have the fullest set of rights, workers have a subset (including national minimum wage, working time protections, and holiday pay, but not unfair dismissal or statutory redundancy pay), and the self-employed have the fewest. For over a decade, academics, trade unions, and some employers have debated whether the three-tier system should be collapsed into two.
ERA 2025 does not introduce single worker status. The three-tier system remains. But ERA 2025 does make the distinction between employee and worker less significant in some respects — by giving workers who are currently classified in the middle tier several rights that were previously employee-only. The trajectory of the law is toward convergence, even if full merger has not arrived.
The status question matters most in three practical situations: when you take on someone through a platform or agency, when you use a contractor on a long-term basis for work that looks similar to what employees do, and when you engage someone on a zero-hours arrangement. In each of these cases, the actual legal status depends on the reality of the relationship, not the label on the contract.
The Supreme Court ruling in the Uber case (2021) established that the label on a contract does not determine status — what matters is the actual nature of the working arrangement. Since then, a series of tribunal and court decisions have confirmed that workers who have been labelled "self-employed" but who in practice take direction, work exclusively for one client, and cannot substitute someone else in their place, are likely to be workers or employees.
For employers, the relevant risk is the gap between what the contract says and what actually happens. A delivery driver labelled self-employed who is given a route each morning, required to wear a uniform, and cannot turn down shifts without consequence is almost certainly a worker. An IT consultant engaged through their own limited company, who sets their own hours, can substitute another consultant, and provides services to multiple clients is closer to genuinely self-employed.
The practical audit for HR teams: review your contractor and agency workforce. For each engagement, ask: does this person work exclusively for us? Do we control how they do their work, or just the outcome? Can they send someone else in their place? Is this engagement genuinely time-limited or has it been running for years? Where the answers point toward a de facto employee or worker relationship, the risk of misclassification is real.
For businesses using IR35 (off-payroll working rules), the status question has an additional tax dimension. See our guide on managing contractors alongside employees for the practical steps on classifying and managing a mixed workforce.
See our ERA 2025 overview for the broader context of ERA 2025 changes and how they interact with status questions.
Mellow's contractor management module tracks engagement status, flags IR35 determination requirements, and maintains the documentation trail. [Start a free trial →](https://mellowhr.com/register)