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Labour-only subcontractors are some of the most common engagements in UK construction, and also some of the highest risk when it comes to employment status. HMRC has repeatedly targeted construction businesses over misclassified labour-only arrangements, and where a worker operates through their own limited company, IR35 adds a further layer of risk on top of standard CIS rules.
This guide explains exactly how IR35 and employment status rules apply to labour-only subcontractors in construction, what the key tests are, and what is at stake if HMRC successfully challenges your arrangements. YRF Accountants advisecontractors and subcontractors across Bolton, Manchester, and Bury on exactly this issue.
What Makes Labour-Only Subcontractors Higher Risk?
A labour-only subcontractor supplies their own time, skill, and labour but little else — no significant materials, plant, or equipment of real value. This is precisely the profile HMRC scrutinises most closely, because the absence of meaningful financial risk or investment in the work makes the arrangement look closer to employment than genuine self-employment.
This applies whether the subcontractor operates as a sole trader (where CIS misclassification is the concern) or through their own limited company (where IR35 becomes the relevant test). Many construction businesses engage the same type of worker under both structures without realising the rules that apply differ.
IR35 vs CIS Misclassification: What Is the Difference?
These two risks are often confused, but they are assessed separately:
- CIS misclassification asks: should this worker be treated as self-employed under CIS at all?
- IR35 asks: if this worker's personal service company did not exist, would they be an employee of the engaging business?
A worker can pass one test and fail the other. A limited company subcontractor can be correctly registered and deducted under CIS, while the underlying relationship still falls inside IR35 if it resembles employment in practice.
The Key Employment Status Tests HMRC Applies
Whether assessing IR35 or CIS self-employed status, HMRC and tribunals consistently come back to the same core tests:
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Status Test
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What It Looks At
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Control
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Does the contractor dictate how, when, and where the work is carried out, or does the worker have genuine autonomy?
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Substitution
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Can the worker send a suitably qualified substitute to do the job, or must they personally attend and perform the work?
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Mutuality of Obligation
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Is the contractor obliged to offer ongoing work, and is the worker obliged to accept it, beyond the current job?
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Financial Risk
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Does the worker provide their own tools, fix prices, correct defective work at their own cost, and risk their own profit or loss?
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Integration
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Is the worker treated like part of the contractor's own workforce (uniform, supervision, site rules) rather than an independent business?
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No single test is decisive on its own. HMRC, and any tribunal reviewing a disputed case, looks at the overall picture across all five factors together.
What You Risk If HMRC Successfully Challenges Status
Getting employment status wrong on labour-only subcontractors is not a minor administrative issue. The financial and compliance consequences can be severe, and can land on either party:
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Who Bears the Risk
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Consequence of Getting It Wrong
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Contractor (engager)
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Liable for unpaid PAYE tax and Employer's NIC, plus interest and penalties, if HMRC reclassifies workers as employees
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Subcontractor (worker)
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May owe additional Income Tax and Employee NIC, and could lose CIS gross/registered status if compliance is questioned
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Both parties
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Reputational damage with HMRC, increased scrutiny in future compliance checks, and potential loss of Gross Payment Status
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Limited company subcontractors
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Personal service companies inside IR35 face the deemed employment payment calculation, increasing tax due significantly
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For limited company subcontractors caught inside IR35, the deemed employment payment calculation can significantly increase the tax due, often with several years of liability if HMRC challenges historic engagements rather than just the current one.
Practical Steps to Reduce IR35 and Status Risk
Construction businesses engaging labour-only subcontractors can take concrete steps to reduce risk on both fronts:
- Ensure written contracts reflect the genuine working relationship, not just a label
- Build in a real, unfettered right of substitution wherever practically possible
- Avoid treating subcontractors identically to direct employees on site (supervision, uniforms, fixed hours)
- Confirm subcontractors carry genuine financial risk, such as fixing defective work at their own cost
- Review status periodically, especially for long-running engagements with the same individual
If you are unsure whether your current subcontractor base is correctly classified, our
CIS Tax Services for Subcontractors & Contractors page covers how we support contractors through registration, verification, and compliance review.
Don't wait for an HMRC compliance check to find out your labour-only subcontractors are misclassified. YRF Accountants reviews IR35 and CIS status risk for construction businesses across Bolton and Manchester.
Book a Free IR35 & CIS Compliance Call
Frequently Asked Questions: IR35 for Labour-Only Subcontractors
IR35 (off-payroll working rules) applies specifically to workers operating through their own limited company (personal service company). Sole trader subcontractors are not subject to IR35, but their employment status under CIS can still be challenged separately by HMRC.
A labour-only subcontractor supplies their own work and skill but not materials, plant, or equipment of any real value. HMRC views labour-only arrangements as carrying higher employment status risk than those supplying materials and equipment too.
CIS misclassification concerns whether a worker should be paid as self-employed at all. IR35 concerns whether a worker operating through their own limited company would be an employee if that company did not exist. They overlap but are assessed separately.
For private sector engagements, the responsibility for determining status (and the tax liability for getting it wrong) typically sits with the end-client or fee-payer, depending on the size and structure of the engaging business.
Yes. A limited company subcontractor can be correctly registered under CIS for deduction purposes while still falling inside IR35 if the underlying working relationship resembles employment.
Written contracts reflecting the true working relationship, evidence of genuine substitution rights, proof of financial risk (your own tools, fixed-price work, correction of defects at your own cost), and working practices that match the contract on paper.
Yes. YRF Accountants reviews contractor relationships, working practices, and CIS arrangements for construction businesses across Bolton, Manchester and Bury to reduce IR35 and misclassification risk before HMRC raises it.