CIS Tax · Employment Status · 2026/27
CIS decides how tax is collected, not whether you are self-employed. HMRC answers that question by looking at how you actually work, and if the answer is "employee", the bill lands mostly on the contractor.
By QuoteDone Editorial Team · Last updated: 25 September 2026 · Checked against GOV.UK guidance
Many people in construction assume that if a contractor deducts CIS, the worker must be self-employed. You have a UTR, you are registered for CIS, you invoice: that settles it.
It does not. CIS is a way of collecting tax from payments. Employment status is a separate question, and HMRC decides it by looking at the reality of the working relationship, not at the payment scheme or the label in a contract.
Employed or Self-Employed: The Signs HMRC Looks For
| Question | Points to employment | Points to self-employment |
|---|---|---|
| Control | You are told how, when and where to work, day to day. | You decide how to deliver the agreed job. |
| Personal service | You must do the work yourself. | You have a real, usable right to send a suitable substitute. |
| Mutual obligation | An ongoing expectation to offer and accept work. | Separate jobs, each with its own scope and end. |
| Equipment | The contractor provides tools and kit. | You provide your own tools, van and equipment. |
| Financial risk | Paid for time regardless of outcome. | Priced jobs; you fix defects at your own cost and can make or lose money. |
| Clients | One contractor, month after month. | Several clients, finding your own work. |
No single row decides your status. HMRC weighs the whole picture. See GOV.UK – Employment status: self-employed and contractor.
Genuinely self-employed under CIS?
Then make sure you are claiming back everything HMRC owes you.
CHECK YOUR REFUND NOW →✓ No registration required · 100% Free · HMRC 2026/27 Aligned
The Three Core Tests, in Plain English
1. Control: who decides how the work is done?
Some coordination on a building site is normal: start times for safety, site rules, the sequence of trades. That does not make you an employee. What matters is whether someone controls how you do your work: the method, the pace, your daily tasks, and whether they can move you from job to job.
2. Personal service: can someone else do it?
If you can send a suitably skilled substitute and pay them yourself, that points towards self-employment. A substitution clause that could never be used in practice counts for little. HMRC looks at whether the right is real.
3. Mutual obligation: what did the 2024 Supreme Court ruling change?
For years, workers and contractors argued there was no "mutuality of obligation" because either side could walk away between jobs. In HMRC v PGMOL (2024), the Supreme Court held that for a single engagement, the basic mutual obligation is met where work is done in return for pay. That argument is now much weaker, and the other factors, especially control, financial risk and the overall picture, carry more weight.
Labour-Only Work: Where It Fits
Many genuinely self-employed tradespeople supply only labour, with the contractor providing materials. Labour-only work does not make you an employee on its own.
The risk comes when labour-only is combined with the other employment signs: paid by the hour or day with no chance of profit or loss, using the contractor's tools, working under a foreman's direction, and working for one contractor continuously. Your paperwork can reflect that reality too. Invoices built around "hours worked", "overtime" or "holiday" describe employment, while invoices for a defined job at an agreed price describe a business.
| Labour-only arrangement | Direction of travel |
|---|---|
| Fixed price per job, own tools and van, you put right defects at your own cost, several contractors | Towards self-employment |
| Day rate, own hand tools, one main contractor, some say over how the work is done | Mixed: depends on the detail |
| Hourly rate, contractor's tools, foreman directs daily tasks, one contractor for over a year | Towards employment |
Illustrative only. Status depends on all the facts of each engagement.
What Misclassification Costs, and Who Pays
If HMRC decides a worker paid under CIS was really an employee, the contractor becomes responsible for operating PAYE on those payments. That means Income Tax, employee National Insurance and employer National Insurance, plus interest and possibly penalties. The worker's own tax position is recalculated on the basis that the income was employment income.
The cost CIS never covered: one worker, £40,000, 2025/26
CIS deductions are the worker's tax. Employer National Insurance is a separate cost that nobody paid. This is one worker for one year, before interest and penalties, and before any shortfall in the worker's tax and employee NI.
| How far back HMRC can normally go | Time limit |
|---|---|
| Ordinary cases | 4 years |
| Careless errors | 6 years |
| Deliberate behaviour | 20 years |
Check Your Status With HMRC's CEST Tool
Check Employment Status for Tax (CEST) is HMRC's free online tool. It gives HMRC's view of whether a worker is employed or self-employed for tax purposes. According to HMRC's guidance:
- HMRC will stand by the result as long as the information you give is accurate and in line with its guidance.
- If the contract or working arrangements change materially, the old result no longer applies, so run it again.
- HMRC will not stand by results from contrived arrangements set up to get a particular answer, and treats that as deliberate non-compliance.
- The tool is anonymous, so save or print your answers and result for your records.
Keep Your Self-Employed Status Defensible
The aim is not to dress up an employment relationship. It is to make sure a genuine business is properly evidenced.
- Quote and invoice for defined jobs at agreed prices where the work allows it
- Use and record your own tools, equipment and vehicle
- Keep evidence of financial risk: fixing defects at your cost, pricing jobs, covering your own insurance
- Work for more than one contractor, and keep records of it
- Make sure any written contract describes how you really work, and update it if the arrangement changes
- Run CEST honestly at the start of long engagements and when arrangements change, and keep the result
- Keep a separate business bank account and proper business records
CIS and IR35: Related but Different
IR35 (the off-payroll working rules) applies where someone works through an intermediary, usually their own limited company, in a way that would be employment without that company. CIS is a deduction scheme for construction payments. A limited company subcontractor in construction can be affected by both.
Frequently Asked Questions
Does being registered under CIS mean I am self-employed?
No. CIS decides how tax is collected from payments in construction. It does not decide your employment status. HMRC looks at how you actually work, and can treat a CIS-registered worker as an employee if the reality of the relationship is employment.
How does HMRC decide if I am employed or self-employed?
HMRC looks at the whole working relationship. Key questions are whether the contractor controls how, when and where you work, whether you must do the work personally or can send a substitute, whether there is an obligation to offer and accept work, whether you provide your own equipment, and whether you carry financial risk. No single factor decides it.
Does labour-only work make me an employee?
Not on its own. Many genuinely self-employed tradespeople supply only labour. But if you also have no financial risk, use the contractor's equipment, are paid by the hour and work under close direction, the overall picture moves towards employment.
What happens if HMRC decides I should have been an employee?
The contractor becomes responsible for the PAYE Income Tax and National Insurance that should have been operated, including employer National Insurance, plus interest and possibly penalties. Your own tax position is recalculated on the basis that the income was employment income.
What is the CEST tool?
Check Employment Status for Tax is HMRC's free online tool. It gives HMRC's view of whether a worker is employed or self-employed for tax purposes. HMRC says it will stand by the result as long as the information you give is accurate and in line with its guidance, but not for contrived arrangements.
Can I work for one contractor for years and still be self-employed?
It is possible, because no single factor decides status. But a long-term arrangement with one contractor, under their direction, without the right to send a substitute and without financial risk, points strongly towards employment. The longer it lasts, the more important the other factors become.
Does the PGMOL Supreme Court case matter for CIS workers?
Yes. In 2024 the Supreme Court held in HMRC v PGMOL that the mutual obligation needed for employment can exist in a single engagement where work is done for pay. Arguing that there is no mutual obligation because either side could walk away is now much weaker.
Important: This article is general information about employment status for tax purposes, not legal or tax advice. Status depends on the full facts of each engagement, and employment rights are decided under employment law. If you are unsure, speak to a qualified tax adviser or employment specialist.
Author: QuoteDone Editorial Team · Last updated: 25 September 2026
Sources: GOV.UK – Check employment status for tax · HMRC – ESM11010 Results from CEST · GOV.UK – Employment status · UK Supreme Court – HMRC v PGMOL [2024] UKSC 29
Ready to claim your CIS refund?
Use our free calculator to find out what HMRC owes you.
CHECK YOUR REFUND NOW →Need professional invoices fast?
Create clean, compliant invoices in seconds with our free tool.
TRY FREE INVOICE GENERATOR →