Can I opt out of CIS or cancel my registration?

Can I opt out of CIS or cancel my registration? No. In 2026-27 a contractor paying you for construction work must apply CIS whether you register or not. Unregistered, 30% is taken instead of 20%. Only gross payment status stops the deductions. GOV.UK gives subcontractors no separate step to cancel a CIS registration. If you stop trading, you tell HMRC you have stopped self-employment and call the CIS helpline as soon as possible. No. HMRC's manual says a subcontractor only needs to register once, unless the business structure changes, for example when a sole trader forms a company. Contractors still have to deduct, but at 30% instead of 20%. The deductions still count towards your tax and National Insurance, and any overpayment comes back after you file your tax return. Read the full answer, with every source, at rightotax.co.uk.