HMRC £15bn CIS crackdown: compliance and contract lessons for contractors
Reviewed by Tom Sullivan
First reported on The Construction Index
30 Second Briefing
HMRC has raised more than £15bn in the first half of 2025-26 through compliance activity and, backed by 5,500 extra compliance staff and new analytics technology, is heavily targeting construction firms under the Construction Industry Scheme (CIS). Hudson Contract reports a surge in checks on SMEs, with contractors tripped up by technical rules on verifying CIS status, gross payments for plant and materials by net-paid subcontractors, and VAT treatment when subbies become labour providers. One “well-run” firm now faces a six-figure liability after HMRC reclassified CIS subcontractors and consultants as employees because key status factors were not correctly expressed in written contracts.
Technical Brief
- HMRC’s determinations are reclassifying CIS subcontractors and consultants as employees for tax and National Insurance.
- Poorly drafted engagement contracts are being treated as equivalent to no contracts in status assessments.
- Contractors remain legally liable for CIS underpayments even where subcontractors supply plant, materials and cost breakdowns.
- Technical CIS breaches include misallocating gross payments for plant and materials to net‑paid subcontractors.
- A key risk point is misjudging when a subcontractor effectively becomes a labour provider for VAT purposes.
- HMRC’s previous tolerance for corrected CIS errors and non‑repetition assurances is reported to have tightened.
Our Take
HMRC’s tougher stance on the VAT domestic reverse charge and CIS, flagged in our 25 February 2026 coverage, suggests that construction supply chains in the United Kingdom will see more detailed subcontractor and labour‑only audits rather than just headline contractor checks.
The 4 February 2026 distress data showing nearly 10,000 UK construction firms in ‘critical’ condition means aggressive HMRC compliance activity now risks tipping marginal contractors over the edge, so main contractors may need to reassess how they vet counterparties’ tax and CIS compliance to avoid project disruption.
Within our 709 Infrastructure stories, HMRC appears more often in connection with financial stress and insolvency than with routine tax administration, signalling that UK contractors should treat tax compliance as a core project‑risk item alongside safety and programme, not a back‑office issue.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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