A profit-seeking enterprise shall, during the period from May 1 to May 31 in the year following the year for which an income tax return shall be filed, fill out and file to the local tax collection authority a tax return indicating therein the retained earnings as calculated in accordance with the provisions of Paragraph 2, Article 66-9 hereof and the amount of additional income tax leviable thereon which shall be paid before the filing of the tax return. This tax return shall still be filed even if the amount of the retained earnings so calculated turns out to zero or a negative figure.

In the case where a profit-seeking enterprise is dissolved or merged with another profit-seeking enterprise prior to its filing of the income tax return under the provisions of the preceding paragraph, it shall, within 45 days from the date of dissolution or merger, file to the local tax collection authority a tax return in respect of its retained earnings which have not been surcharged with an additional 10% profit-seeking income tax up to the date of its dissolution or merger, and shall calculate and make the payment of such surcharged tax before filing the tax return. Upon failure of a profit-seeking enterprise to declare such portion of retained earnings within the aforementioned filing period, the tax collection authority shall forthwith investigate the case, assess the amount of the surcharge income tax on such retained earnings, and advise, by a notice, the said profit-seeking enterprise to pay the surcharge tax accordingly.
Where a profit-seeking enterprise has obtained from the local tax collection authority an approval to the change of its fiscal year, it shall include its retained earnings which have not been surcharged with a 10% additional profit-seeking income tax prior to such change of its fiscal year into the amount of its retained earnings in the fiscal year after the change of fiscal year, and shall take appropriate action in accordance with the provisions of Paragraph 1 of this Article.
When filing its tax return in accordance with the provisions of Paragraphs 1 and 2 of this Article, the profit-seeking enterprise shall submit along with the tax return the receipt of its voluntary tax payment and other relevant evidential documents.