Pay Act of the Armed Force Article 13

Paragraph 1The pay grade of a demoted active serviceman shall be changed to the pay grade of demoted rank. If there is no further lower rank for demotion, he shall be paid by difference according to demoted ranks.Paragraph 2When the pay grade of a demoted serviceman in the preceding paragraph is promoted, he shall be promoted from the demoted pay grade; if there is no further lower rank for demotion, he shall be paid by difference among pay grades and resumed pay on a yearly basis.
中文原文 軍人待遇條例第13條
現役軍人降級者,改支所降之俸級。
無級可降者,以應降之級為準,比照俸差減俸。
前項降級人員依法再予晉支俸級時,自所降之級起遞晉;其無級可降,比照俸差減俸者,應依所減之俸差逐年復俸。

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