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Use form CT600 (2007) Version 2 to file your Company Tax Return for any accounting periods ending on or after 1 April 2004 up to and including 31 March 2008. Companies with less straightforward tax affairs should use this form. Please refer to the CT600 guide (2007) (version 2) for help and a full list of companies that should use this form.
You can file your Company Tax Returns online. You may also be able to use this service to file your accounts jointly with Companies House.