When a business needs more hands during delivery, it is easy to begin with the price: day rate versus wage, van versus payroll, flexibility versus certainty. Those questions matter, but they come after a more basic one: what is the actual working arrangement for this particular engagement?
Calling someone a subcontractor, paying an invoice or seeing a CIS registration does not settle employment status. HMRC guidance makes clear that CIS registration is not proof that a person is self-employed, and that status has to be considered for the engagement itself.
Start with the work, not the label
Write down the practical facts before you decide how to administer the arrangement:
- What result or service is being bought?
- Who decides how, when and where the work is done?
- Is the person genuinely in business on their own account, and what evidence supports that?
- Who provides equipment, insurance, supervision and substitutes where relevant?
- Is this a defined package of work, ongoing people under direction, or something else?
The facts can change from job to job. A person who has previously worked as a subcontractor is not automatically self-employed for every later engagement.
Keep four separate questions separate
| Question | Why it matters |
|---|---|
| Employment status for tax/NICs | This needs a fact-specific assessment. HMRC's CEST service can help assess status for tax and National Insurance purposes. |
| Employment-law status | It can be different from tax status and may carry different rights/responsibilities. |
| CIS treatment | CIS concerns how eligible construction-contract payments are handled; it does not decide employment status. |
| Commercial capacity decision | The business still needs to judge workload, supervision, skills, continuity, cash and risk. |
A safer decision process
- Define the work and the expected working arrangement in writing.
- Gather the facts about control, business risk and how the work will be delivered.
- Consider employment status before adding the person to a CIS process.
- Keep the evidence and review it if the engagement changes.
- Use payroll, CIS and contract processes only after the treatment has been established.
Avoid the tempting shortcuts
- “They have a UTR, so they must be a subcontractor.” A tax identifier does not decide the status of the engagement.
- “They invoice us, so it is not payroll.” Invoice format does not replace the status assessment.
- “CIS handles it.” CIS is not an employment-status determination.
- “We used them this way last year.” A new job or changed working pattern can require a fresh look.
Where facts are unclear or the outcome matters materially, take professional advice. The cost of getting the treatment wrong can be greater than the apparent administrative saving.
Related FoxSums resources
- Payroll Month-End Checklist
- Hire an Employee or Engage a Contractor?
- CIS for Construction and Trades: Contractor and Subcontractor Guide
Next step
Check the actual working arrangement before you decide how to pay someone or describe their status.
Important
General information only. Check the facts and current official guidance for the business’s circumstances.
Sources and review
- Evidence check date: 2 November 2026.
- GOV.UK - employment status: self-employed and contractor
- HMRC - who can use CEST