Regulations for Bid Bond, Guarantee Bond and Other Guarantees Article 3

An entity conducting procurement shall, except where the deposit of bid bond or guarantee bond may be waived, provide in the tender documentation the types, amount, and ways of deposit, refund and termination of bid bond, guarantee bond, and other guarantees to be deposited by a supplier.Where foreign suppliers are permitted to participate in procurement and that a foreign currency in its equivalent value may be used for bid bond or guarantee bond, an entity shall prescribe in the tender documentation the types and ways of deposit with respect to such foreign currency.The equivalent foreign currency referred to in the preceding paragraph shall, unless otherwise provided in the tender documentation, be calculated at the closing spot buying rate of the foreign exchange transaction at the Bank of Taiwan on the business day before the date of deposit.
中文原文 押標金保證金暨其他擔保作業辦法第3條
機關辦理採購,除得免收押標金、保證金外,應於招標文件中規定廠商應繳納押標金、保證金或其他擔保之種類、額度、繳納、退還及終止方式。
機關允許外國廠商參與之採購,其得以等值外幣繳納押標金及保證金者,應於招標文件中訂明外幣種類及其繳納方式。
前項等值外幣,除招標文件另有規定外,以繳納日前一辦公日臺灣銀行外匯交易收盤即期買入匯率折算之。

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