稅捐徵免應遵守租稅法定原則，亦須符合實質課徵之公平原則，納稅人依稅法規定負擔應納之稅捐並享有稅捐減免利益，並依實質負擔能力納稅，以符合租稅公平。在土地借名登記契約之稅捐法律關係，應取決於注重真正權利與利益享有之經濟實質關係，或恪遵法律形式之外部關係而定其稅捐法律效果﹖ 為落實稅法秩序，是否容認形式合法性原則之規範價值優先於實質真實之法律原則。稅捐稽徵現況對於減免類型之原因案件，不僅要求在法律形式上應合致稅捐法規範，且經濟實質上須該當於稅捐法規範。 本文擬經由探討租稅法定原則與經濟觀察法，辨正經濟意義的歸屬與租稅構成要件獨立性的概念與涵義，兼顧法律安定性與公平性之調適，深入探討土地借名登記契約之稅捐徵免法律關係，本文發現課徵現況，有違反避免重複課稅及割裂交易認定事實的疑慮。 為兼容並蓄掌握法律形式與經濟實質，試圖提出土地借名登記契約租稅構成要件認定之操作基準。 / The principle of taxation statutory and the principle of substantive taxation equity are the constructive principles of taxation collection. Paying tax by law and being able to pay in substance means that paying tax and being reduction and exemption from tax as well shall be in accordance with the terms prescribed by taxation law and equality in substantive taxation. Does regarding taxation legal relationship of the contract of borrowing other’s name for land registration, the criteria for determining taxation effect whether shall be subjected to economic substantive relationship or the legal external form﹖ The main scope of this study will analyze the principle of taxation by law and the economic substantive survey methodology , in order to understand the concept and meaning with the connection between the taxpayer and the object taxed in economic purpose, to indentify the statutory requirement of tax independently in accordance with taxation laws and free from any interference, to harmonize and balance with stability of the legal order and the principle of equality in substantive taxation. Reviewing the practical experience in relation to cases involving reduction and exemption from taxation, having taken into consideration all the intents of the arguments, we found out any doubts about giving rise to any issue of double taxation between land value increment tax、income tax and business tax, also being partially and selectively authenticating the economic facts. This study has attempted to propose available programs regarding facts to support the cause of taxation between legal external form and economic substance.