Regulations for Assessing Business Tax of Certain Business Entities Article 3

The competent tax authority should assess the sales amount of business entities specified in the foregoing article once every half year, in January and July respectively, or carry out the assessment at any time deemed necessary when the sales amount of the business entity shall be adjusted due to changes in its scope of business, expansion of its business outlets, changes in business status or reputation, seasonality or other circumstances.For newly established business entities whose business tax is computed based on the assessed sales amount as required by law, the competent tax authority should carry out the assessment in January, April, July and October.
中文原文 營業稅特種稅額查定辦法第3條
主管稽徵機關查定前條營業人之銷售額,應每半年於一月及七月各查定一次。
其有變更營業項目,擴大營業場所或營業狀況、商譽、季節性及其他必須調整銷售額之情形時,得隨時重行查定其銷售額。
新設立之營業人依照規定應查定計算營業稅額者,主管稽徵機關應於一月、四月、七月及十月查定其應納營業稅額。

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