Stamp Tax Act Article 9

Stamp tax shall be computed in common currency. For cases where stamp tax is paid by affixing tax stamps, the tax stamp is waived if the tax amount for the case calculated by the applicable rate is less than one dollar of common currency, and waived for a portion of the tax amount that is less than one dollar of common currency. For cases where stamp tax is paid by filing a collective tax return, tax is waived if the collective tax is less than one dollar of common currency and waived for a portion of the tax amount that is less than one dollar of common currency.
中文原文 印花稅法第9條
印花稅以計至通用貨幣元為止。
凡按件實貼印花稅票者,如每件依稅率計算之印花稅額不足通用貨幣一元及每件稅額尾數不足通用貨幣一元之部分,均免予貼用。
經核准彙總繳納印花稅者,如彙總繳納稅額不足通用貨幣一元及應納稅額尾數不足通用貨幣一元之部分,均免予繳納。

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