File a Company Tax Return - Find HMRC’s Corporation Tax Online filing software
Go to the ‘Welcome to Online services’ page at www.online.hmrc.gov.uk
Go to ‘Existing users’ on the left-hand side and type in your User ID and password and click ‘Log in’
You’ll be taken to the ‘Your HMRC Services’ page where you click the ‘Corporation Tax (CT) for Agents’ ‘Access service’ link.
