739X Application of this Chapter

This Chapter shall apply to—

(a)accounting periods commencing on or after 1 January 2017, or

(b)where an investment undertaking's immediately preceding accounting period ended on or after 31 December 2015 and a decision was made after 20 October 2016 to change the accounting period such that paragraph (a) would not apply, that accounting period commencing on or after 20 October 2016.