The April 2026 changes to the Construction Industry Scheme introduce a "knew or should have known" standard for contractor liability in CIS fraud cases. For the first time, ignorance is not a defence.
 
Tax Radar was built by people who understand this problem from every angle — a former HMRC Fraud Investigation Service officer, a Chartered Tax Adviser who has spent a decade defending contractors in CIS enquiries, and a Lead Data Scientist who built the technology to operationalise that expertise at scale.

We built TaxRadar CIS Defence because we know exactly what HMRC looks for, what documentation protects contractors, and what "reasonable care" actually means in practice — not in theory.

The platform provides subcontractor verification, continuous monitoring, and an auditable due diligence trail that demonstrates reasonable care if HMRC ever comes knocking.

👉 www.taxradar.ai

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