Enforcement Rules of Value-added and Non-value-added Business Tax Act Article 20
Where a business entity sells goods by an installment method, the price stipulated to be received in each installment shall be the sales amount, unless it is stipulated that, at the time of the collection of the first installment, the entire price receivable is to be defined as the sales amount.
中文原文 加值型及非加值型營業稅法施行細則第20條
營業人以分期付款方式銷售貨物者，除約定收取第一期價款時以全部應收取之價款為銷售額外，以各期約定應收取之價款為銷售額。