New CIS legislation in force from 6 April 2026 makes main contractors directly liable for the compliance of every subcontractor in their supply chain — ignorance of your supply chain’s operations is no longer a defence. Non-compliance risks financial penalties, reputational damage, and the loss of your Gross Payment Status, which is difficult and time-consuming to recover once lost. We go beyond basic checks: uncovering hidden corporate structures, verifying financial health, and mapping your entire supply chain against HMRC’s obligations, so you can operate with confidence.