Regulations Governing Securities Firms Article 29

When a securities firm underwrites securities, it shall engage a bank to establish a separate account to collect prices on its behalf unless the securities are delivered on the spot.The prices collected under the preceding paragraph shall not be used unless and until a certificate evidencing payment or the securities sold are delivered to the subscriber.
中文原文 證券商管理規則第29條
證券商承銷有價證券,除當場交付有價證券外,應委託銀行設立專戶代收款項。
前項代收之款項,須向認購人交付價款繳納憑證或所銷售之有價證券後始得動支。

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