Unless otherwise provided, the provisions of Chapter III of the New Act on Special Measures Concerning Taxation apply to corporation tax for business years of a corporation (including an association or foundation without juridical personality prescribed in Article 2, item (viii) of the Corporation Tax Act; the same applies hereinafter) beginning on or after the Effective Date and corporation tax for consolidated business years of a consolidated parent corporation or a consolidated subsidiary corporation having a consolidated full controlling interest with that consolidated parent corporation beginning on or after the Effective Date, and the provisions then in force continue to govern corporation tax for business years of a corporation that began before the Effective Date and corporation tax for consolidated business years of a consolidated parent corporation or a consolidated subsidiary corporation having a consolidated full controlling interest with that consolidated parent corporation that began before the Effective Date.