HM Revenue & Customs

Self Assessment Agent Reference Number

Agents wishing to use the Self Assessment Online service for their clients must already be registered as an agent for Self Assessment with HM Revenue & Customs (HMRC). HMRC will have issued you with a 'Self-Assessment Agent Reference' that you must enter when registering for SA Online.

Further information on how to get an agent code for Self Assessment can be found by following the link below.

Agent codes and agent reference numbers