Enforcement Rules of the Income Tax Act Article 20

Operation of two or more profit-seeking enterprises as stated in Paragraph 1, Article 16 of the Act refers to proprietorship or partnership, of which the setoff is limited to the profit and loss in the same year/period, and the provisions of Article 16 of the Act is not applicable to its investment in corporations, cooperatives, limited partnerships, and medical care corporations.
中文原文 所得稅法施行細則第20條
本法第十六條第一項所稱經營二個以上之營利事業,指獨資經營或合夥經營,其盈虧互抵之規定,應以同年期為限,其投資於公司、合作社、有限合夥及醫療社團法人,不適用本法第十六條之規定。

English translation for reference only; the Chinese text prevails. Not legal advice.