I have a client who incorporated in december 2010 but informed me he did not start trading until 1st April 2011. The CT41G was therefore submitted with a date of 1st April and a year end of 31st March. I have now discovered that the company did have transactions during the period between December and March and therefore cannot be considered dormant for that period. Am I correct in thinking I should inform HMRC of the correct date and therefore will need to sumbit accounts for December 2010 to December 2011 and January 2012 to 31st March 2012 for CT purposes and submit accounts to Companies House for the period from December 2010 to 31st March 2011 and then April 2011 to March 2012. When would the due dates be for each of these?