SVM24062 - Share Valuation Manual: Self Assessment

Corporation Tax Self Assessment (CTSA)

Filing Date

The filing date is the last day of whichever of the following periods is the last to end:

• 12 months from the end of the period for which the return is made ( Example 1 at Appendix A).
   
• if the company’s relevant period of account is not longer than 18 months, 12 months from the end of the period ( Example 2 at Appendix A);
   
• if the company’s relevant period of account is longer than 18 months, 30 months from the beginning of that period ( Example 3 at Appendix A);
   
• three months from the date on which the notice requiring the return was served ( Example 4 at Appendix A).

Each tax office is responsible for assessing the risk of tax loss reflected in company self- assessed tax returns and selecting cases for enquiry. As with ITSA the computer randomly selects a small number of cases for mandatory full enquiry.

It is necessary to open and close enquiries formally.