The provisions of Article 52 (excluding paragraph (9)) of the New Corporation Tax Act apply to corporation tax on income for each business year of a corporation beginning on or after April 1, 2001, and for the transitional business year of an acquired corporation, splitting corporation, corporation making a capital contribution in kind or corporation making a post-formation acquisition of assets (hereinafter referred to as an "acquired corporation, etc." in this Article) pertaining to a merger, company split by split-off, qualified company split by spin-off, qualified capital contribution in kind or qualified post-formation acquisition of assets (hereinafter referred to as a "merger, etc." in this Article) carried out on or after that date (the transitional business year meaning the business year containing the date of that merger, etc. (for a merger or company split by split-off, the day preceding the date of that merger or company split by split-off), excluding a business year of that acquired corporation, etc. that falls under each of those business years; the same applies hereinafter in this Article), and with regard to corporation tax on income for each business year of a corporation that began before April 1 of that year (excluding a transitional business year), the provisions then in force continue to govern.