Employment status in the Construction Industry Scheme context is the determination of whether a worker on a construction site is genuinely self-employed (and therefore within CIS) or is actually an employee of the contractor (and therefore subject to PAYE and employer National Insurance instead).

Registration under CIS does not automatically make a worker self-employed. HMRC applies a separate, multi-factor employment status test that looks at the true nature of the working arrangement. The three primary factors are:

  • Control. Does the contractor direct how, when and where the worker carries out the work, or does the worker control their own methods? The greater the contractor's control, the stronger the argument for employment.
  • Personal service. Is the worker required to do the work personally, or can they send a substitute? A genuine right of substitution (one that is exercised in practice) points towards self-employment.
  • Mutuality of obligation. Is the contractor obliged to offer work and the worker obliged to accept it? Ongoing mutuality, particularly between jobs, is a strong indicator of employment.

Getting employment status wrong is costly. A contractor who treats an employed worker as a self-employed CIS subcontractor becomes liable for backdated employer NIC at 15% on earnings above £5,000 a year (the rate from April 2025, carried into 2026/27), plus PAYE income tax and employee NIC, for every year the arrangement ran. HMRC's CEST tool (Check Employment Status for Tax) provides a starting-point assessment but is not binding, and its result can be challenged if the underlying facts are not accurately entered.

The risk is heightened in construction because labour-only subcontractors on long-running sites often work under arrangements that look, in substance, like employment even if they are structured as self-employment. HMRC construction-sector taskforces specifically target this.

A full explanation of how HMRC applies the three-part test in the construction context is at CIS employment status: how HMRC tests whether you are self-employed or employed. The comparison of CIS and PAYE treatment is at CIS vs PAYE: the key differences for construction workers.