On-line Filing of CT600 Returns
From 1 April 2011 onwards, all companies and organisations must submit their corporation tax returns online for any accounting period ending after 31 March 2010.
In preparation for the change from paper to online, HMRC will not be issuing blank paper return forms from 1 July 2010.
Notwithstanding the above, it will still be possible to download and print the forms from the HMRC website after 1 July 2010 but such returns must be submitted before 1 April 2011 if they relate to any accounting period ending after 31 March 2010.
