本研究利用Ramsey-Cass-Koopmans成長模型，針對台灣遺產稅制在稅率調降為40%、10%、0%，以及調降稅率至使資本存量不變等四種情境，進行模擬分析，來探討降低遺產稅稅率對經濟體系的影響。以台灣2007年度相關資料的模擬分析結果顯示微幅調降遺產稅稅率有助於提升資本存量，帶動經濟成長，但遺產稅率調降後不宜低於28.22%，否則資本存量將會下降，不利經濟成長。研究結果也發現，遺產稅率調降造成相對價格的改變，產生超額負擔。依本研究結果，我國目前將遺產稅稅率調降為10%是無法達到增加資本存量，帶動經濟成長之目的。因此政府應極力尋求其他配套措施及籌措替代財源之方案加以因應，以維持稅收中立之原則，並將稅率調整至符合整體國家環境之範圍。

This study uses Ramsey-Cass-Koopmans Growth Model to conduct simulation analyses of the basic structure of Taiwan's estate tax law in order to understand the impact of lowered estate tax rates on the economy. The simulation was conducted for four hypothetical estate tax rate reform policies, namely tax rate cuts to 40%, 10%, and 0% of the current tax rate, and also a tax rate cut to the rate at which the capital stock remains unchanged. Simulation based on relevant 2007 data pertaining to Taiwan show that an estate tax rate cut to 40% of the current rate results in an increase to capital stock, while estate tax rate cuts to 10% and 0% result in decreased capital stock. More specifically, simulation results indicate a decrease in capital stock and economic growth when post-adjusted estate tax rate fall below 28.22%, which resembles the optimal estate tax rate to keep capital stock unchanged. The results also show that estate tax rate cuts have caused changes in relative prices, resulting in excess burden. The implication of our simulation results is that Taiwan's current estate tax rate cut to 10% will not be able to increase capital stock and promote economic growth. Therefore, the Government should invest efforts in seeking alternative complementary measures and programs as sources for funding in order to maintain the principle of tax neutrality, and to allow nation’s tax rate to conform to her overall environment.