From 17 September 2012, calls handled by the existing Corporation Tax operations offices began to be dealt with by HMRC contact centres.

HMRC is changing the way Corporation Tax customers contact HMRC by phone to bring this into line with other HMRC customers. From the above date, most calls about Corporation Tax are routed to one of two contact centres-based in Cardiff and Glasgow-through a new number.

If an enquiry cannot be dealt with at this first point of contact, it will be referred to and dealt with by a dedicated operations team, who will make onward contact where necessary.

It should be noted that if a company is being dealt with by a specialist team, for example for the Large Business Service, the contact number will not change.

Details of precisely when the existing telephone numbers for each Corporation Tax operations office will transfer are available at http://www.hmrc.gov.uk/news/ct-contact.htm