Unless otherwise provided for, the provisions of Chapter III of the New Act apply to corporation tax of a corporation (including an association or foundation without juridical personality prescribed in Article 2, item (viii) of the Corporation Tax Act (Act No. 34 of 1965); the same applies hereinafter) for business years beginning on or after the Effective Date, and the provisions then in force continue to govern corporation tax of a corporation for business years that began before the Effective Date.