HM Revenue & Customs CIO, Phil Pavitt, has announced that he will be stepping down from his role to take up a position in the private sector with insurer Aviva.

Pavitt joined HMRC in 2009 after a two year stint as CIO at Transport for London, and has been responsible for overseeing a complete transformation of the department's IT estate. During this period HMRC has halved its annual IT costs to £700 million.

Deputy-CIO, Mark Hall, has taken over Pavitt's role. However, Pavitt will remain with the department until January.

An HMRC spokesman said: ""Having completed a number of major transformations at HMRC, Phil indicated that he wished to return to his private sector career. We would like to thank Phil for his work at HMRC."

Pavitt will become Aviva's global director of IT transformation in the New Year and will be leading the execution of their IT strategy, which includes simplifying their IT services and digitising the whole of their business.