CIS Registration — we register you as a contractor or subcontractor with HMRC. Monthly CIS Returns — we file your monthly returns on time, every time. CIS Tax Refund Claims — overpaid CIS tax? We claim it back through your Self Assessment. CIS Verification — we verify your subcontractors and ensure correct deduction rates. CSCS Cards — green cards, blue cards, skills tests and health & safety through our partners.