台灣的經濟主要以外銷為導向，近年來因為中國大陸經濟崛起，隨著兩岸經濟的逐漸開放，供應商產業外移，無論傳統產業或高科技產業製造相關企業，西進中國大陸已成台灣產業發展主流，貿易商採用多角貿易進行各種不同商業活動方式早已發展為台灣企業從事國際多角貿易的交易模式，而現行稅務主管機關對傳統外銷之各項租稅規定、法令規範、稽徵程序、實務審核作業規範等，對於台灣產業國際多角貿易類型，產生許多租稅疑義。因此，本論文以問卷調查方法，探討台灣企業從事國際多角貿易面臨之租稅相關議題，以提出改進我國企業從事國際多角貿易之相關租稅規範建議，供政府主管機關參考。 　　本文的問卷結果顯示，國際多角貿易之營業比重在台灣產業已占有舉足輕重之地位，且超過50%受訪企業認為，公司從事國際多角貿易交易與傳統直接外銷，不論在經濟實質、權利義務或風險瑕疵責任歸屬，兩者均相同。有70%以上之受訪企業表示對現行加值型營業稅及營利事業所得稅，在適用上產生困擾。雖然，現行法令對於公司從事國際多角貿易交易收入有銷貨及勞務之區分，但本文的問卷結果顯示有超過80%以上受訪企業認為企業從事國際多角貿易交易的性質係屬銷貨行為，並希望財政部簡化現行對國際多角貿易交易之課稅規範。 　　本論文建議，要健全國際多角貿易課稅規範，消弭國際多角貿易之租稅疑議，首先，必須打破現行課稅法令對國際多角貿易區分由國內出貨或第三地出貨，依出貨地是否在中華民國境內而有不同認定之迷失。其次，對國際多角貿易之會計處理應回歸交易實質，不應藉由課稅之考量來左右會計基礎之入帳原則。最後，財政部應簡化現行對國際多角貿易之課稅規範，減少企業因複雜之課稅規定而將第三地出貨之多角貿易收入規避不列入台灣之營業收入。 / Taiwan's economy is primarily export-oriented. In recent years, because of the rise of economy in mainland China, with cross-strait economy liberalization and relocation of suppliers, both traditional and high technology industry businesses have been moving to mainland China as mainstream of Taiwan's industrial development. Multi-lateral transactions have been adopted by Taiwanese companies in engaging in various international business activities. However, tax laws and regulations, as well as assessment procedures adopted by Taiwan tax authorities, on multi-lateral business have triggered many tax disputes. Therefore, with surveys by questionnaires, this study aims to investigate into the relevant tax issues in the multi-lateral international trade of Taiwanese enterprises and propose suggestions for the tax authorities to improve Taiwan tax treatment on multi-lateral international trade. 　　The questionnaire results show that multi-lateral international trade has become a dominant business model in Taiwan industry, more than 50% of the respondents consider both multi-lateral international trade transactions and the traditional direct export are the same, with respect to economic substance, rights and obligations or liability risks of the transactions. More than 70% of the respondents indicate that they have encountered problems when applying to the existing value-added tax law and business income tax law. Although the existing reguations for companies engaging in multi-lateral international trade transactions classify such transactions into sales and services in their respective tax treatments, the questionnaire results show that more than 80% of the respondents consider such transactions should be all regarded as sales of goods, and urge the Ministry of Finance to simplify the existing taxation on such transactions. 　　This paper proposes the following suggestions to make taxation on multi-lateral international transactions more reasonable and enforceable. First of all, the existing taxation on multi-lateral international trade should not classify such transactions as domestic shipment or third place shipment solely by whether the shipping point is in the territory of Republic of China or not. Second, the accounting for international multi-lateral trade should reflect the substance of such transactions instead of following the tax law treatment. Third, the Ministry of Finance should simplify the existing tax treatment for multi-lateral international trade to prevent Taiwanese enterprises from under-reporting multi-lateral international trade revenues derived from third place shipment in filing Taiwan business income tax because of the complexity of the exitng tax regulations.