Construction businesses regularly engage labour on a subcontract basis. However, registering someone under the Construction Industry Scheme does not automatically make that person self employed. CIS only applies where the underlying arrangement is not a contract of employment.
Getting the decision wrong can leave a contractor responsible for PAYE, National Insurance contributions, interest and penalties. It can also create employment rights, minimum wage, holiday pay and pension issues. Contractors should assess status when each engagement starts and review it whenever the working arrangement changes.
Why Employment Status Matters
Employment status determines how a construction worker should be paid and taxed. A genuine subcontractor normally invoices for work and is responsible for their own tax position, although the contractor may need to make CIS deductions. An employee must normally be paid through payroll, with PAYE and National Insurance calculated and reported to HMRC.
A person may be self employed on one project but employed on another because status is considered for the particular engagement. Previous CIS registration, a Unique Taxpayer Reference, an invoice or a written subcontractor agreement does not settle the issue by itself.
The real working relationship matters. If a contract describes someone as self employed but the site arrangements resemble employment, HMRC may look beyond the wording and assess the facts.
CIS Does Not Decide Status
CIS governs payments made by contractors to qualifying subcontractors for construction operations. Depending on HMRC verification, payments may be made gross or after a deduction. However, employees are outside CIS and should instead be dealt with through PAYE.
Contractors must declare on their monthly CIS return that the listed subcontractors are not employees. HMRC states that an incorrect employment status declaration can result in a penalty of up to £3,000.
This means verification is not a substitute for a status assessment. HMRC may verify a person for CIS purposes, but the contractor must still decide whether the engagement is genuinely self employed.
Main Employment Status Tests
There is no single test that decides every case. The complete relationship must be considered, including the written agreement and what happens on site.
Personal Service
An employee is generally expected to perform the work personally. A genuine and practical right to provide a substitute may support self employment, particularly where the subcontractor chooses, engages and pays the replacement. A clause that would never be accepted in practice carries little weight.
Control
Consider who controls what work is completed and where, when and how it is done. Health and safety requirements, site sequencing and quality standards do not automatically create employment. Risk increases where the contractor closely directs the worker’s hours, methods and daily duties rather than specifying the required result.
Financial Risk
A genuine subcontractor is more likely to risk their own money. Relevant factors include quoting for work, correcting defective work at personal cost, maintaining business insurance and meeting meaningful equipment, labour or material expenses. Ordinary travel costs and a few small tools are not usually strong evidence on their own.
Mutual Obligations
The contractor should consider whether it must keep offering work and whether the individual must accept it. An ongoing expectation of regular work can point towards employment, although mutual obligations alone do not decide the outcome.
Business Independence
Signs of an independent business can include working for several customers, advertising services, negotiating prices, issuing invoices, employing helpers and deciding how to make a profit. Wearing a branded vest or using a Construction Skills Certification Scheme card does not, by itself, establish tax status.
Warning Signs on Site
A subcontractor arrangement may need urgent review where the individual:
- Works regular hours set by the contractor
- Must perform all work personally
- Is paid by the hour or week regardless of output
- Receives detailed supervision over how work is done
- Uses nearly all equipment supplied by the contractor
- Bears little risk of loss or defective work
- Works continuously for one business
- Is treated in practice like directly employed site staff
No single point is conclusive. For example, an experienced tradesperson can be paid a day rate and still be self employed, but the other facts must support that conclusion.
Tax and Accounting Risks
If HMRC concludes that a subcontractor was really an employee, it may seek PAYE and National Insurance that should have been operated. Interest and penalties may also arise, while inaccurate CIS returns may need correction.
The contractor’s accounts can also be affected. Labour recorded as subcontractor costs may need to be reclassified as wages, and additional liabilities may be required for employer National Insurance, workplace pension duties and employment related amounts. Historic CIS deductions do not necessarily remove the PAYE exposure, so specialist calculations may be needed to avoid incorrect assumptions or duplication.
Misclassification may also affect gross payment status where a contractor operates as a subcontractor elsewhere. HMRC guidance warns that failure to operate CIS properly can put that status at risk.
How to Make a Defensible Decision
Contractors should apply a consistent process before the first payment is made:
- Gather the contract, quotation, scope of work and proposed payment terms.
- Record how control, substitution, equipment, financial risk and future work operate in practice.
- Use HMRC’s Check Employment Status for Tax tool with accurate information. HMRC says it will stand by the result where the facts supplied remain accurate and follow its guidance.
- Save the questions, result and supporting evidence with the subcontractor file.
- Review status when duties, rates, supervision or working arrangements change.
- Ensure payroll and CIS records follow the final decision.
A carefully written contract is useful, but it must match reality. Site managers and accounts staff should therefore follow the agreed arrangement rather than unintentionally treating an independent trade as an employee.
Agencies, Companies and Labour Suppliers
Extra rules may apply where labour is supplied through an agency, umbrella company or personal service company. The off payroll working rules can apply when an individual supplies services through their own intermediary and would otherwise be treated as an employee. Responsibility for the decision depends on the size and type of client.
From 6 April 2026, where an umbrella company employs the worker, the relevant agency or, where there is no agency, the end client is responsible for ensuring PAYE is operated correctly and can be liable for a shortfall. Construction businesses should map the labour supply chain, confirm who employs and pays each worker and retain evidence of proportionate checks. HMRC also recommends testing the credibility and tax compliance of labour suppliers rather than relying solely on contractual assurances.
How Construction Tax accountants Can Help
Employment status decisions require both construction sector knowledge and accurate tax treatment. Construction Tax accountants can help contractors build a practical compliance process that supports the business from subcontractor onboarding through to monthly CIS reporting.
Our team can review current subcontractor arrangements to identify higher risk cases and assess employment status by considering both written contracts and actual site practices. We can also support CEST reviews, helping you retain clear evidence behind each status decision should HMRC raise questions later.
Where issues are identified, we can help correct PAYE, CIS and accounting treatment, while reviewing arrangements involving agencies, personal service companies and wider labour supply chains. We can also assist with HMRC enquiries, quantify potential liabilities and strengthen your subcontractor onboarding, payroll procedures and monthly CIS controls.
Frequently Asked Questions:
Does a CIS registration prove someone is self employed?
No. CIS registration and verification do not decide employment status. The contractor must assess the individual engagement before applying CIS.
Can a subcontractor work for only one contractor?
Yes, but working mainly for one business can be relevant. Status depends on all the facts, including control, substitution, financial risk and business independence.
Should employment status be checked every year?
It should be checked when the engagement begins and whenever the working arrangement changes. Periodic reviews are also sensible for long running projects.
What happens if HMRC finds misclassification?
The contractor may face PAYE and National Insurance liabilities, interest, penalties and corrections to CIS and payroll records. Employment law liabilities may arise separately.
