HM Revenue & Customs

Corporation Tax Agent Reference Number

To enrol for the Corporation Tax for Agents online service you must be registered as an agent for Corporation Tax.

When you register you'll be given a Corporation Tax agent reference code. You must enter this reference code to complete your enrolment.

If you haven't registered yet you can do so by writing to the HM Revenue and Customs Central Agent Authorisation Team on headed notepaper (if appropriate). You must provide your name, business name, address and telephone number along with details of the taxes you plan to deal with, eg Corporation Tax. You need a separate agent code for each tax.

The address for the Central Agent Authorisation Team can be found on the GOV.UK website.