Regulations Governing the Use of Uniform Invoices Article 23

In the event of loss of unused blank uniform invoices, business entities shall immediately report the matter together with a description of the cause of loss, the type and alphanumeric code numbers of the lost invoices to the competent authority for cancellation.In the event of loss of the retention copies of issued uniform invoices, if a copy of the original receipt copy from the purchaser with an official stamp impressed thereon for certification has been obtained, the said copy of the purchaser’s receipt copy may be used as the retention copy.In the event of loss of the deduction copy or the receipt copy of a uniform invoice, if a copy of the original retention copy from the original business entity seller with an official stamp impressed thereon for certification has been obtained, or if the remaining copy of the receipt is impressed with an official stamp of the business entity itself for certification is used, said copy may be used in replace of the lost deduction copy or receipt copy as the input tax deduction or accounting voucher.
中文原文 統一發票使用辦法第23條
營業人遺失空白未使用之統一發票者,應即日敘明原因及遺失之統一發票種類、字軌號碼,向主管稽徵機關申報核銷。
營業人遺失已開立統一發票存根聯,如取得買受人蓋章證明之原收執聯影本者,得以收執聯影本代替存根聯。
營業人遺失統一發票扣抵聯或收執聯,如取得原銷售營業人蓋章證明之存根聯影本,或以未遺失聯之影本自行蓋章證明者,得以影本替代扣抵聯或收執聯作為進項稅額扣抵憑證或記帳憑證。

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