Online filing of Corporation tax returns

HMRC have written to half a million companies and their tax agents, to advise them of important changes to Corporation Tax (CT) return filing.

The mail-shot contained a new HMRC leaflet on the changes, which will require all company tax returns delivered after 31 March 2011 to be filed online, for accounting periods ending after 31 March 2010. The leaflet explains how, after 31 March 2011, CT returns must be filed online in a specified data format (known as Inline XBRL or iXBRL). Companies House has also announced that it will accept company accounts in XBRL, the same format as the CT returns. Companies House will introduce their XBRL service for unaudited full accounts by the summer of 2010, and then continue to develop their XBRL capability for all the main types of accounts they receive. HMRC’s new XBRL service will be available from November 2009.