This report is the 5th edition of ADB's A Comparative Analysis of Tax Administration in Asia and the Pacific. It provides internationally comparative data on aspects of tax systems and their administration in 38 economies and detailed analysis of the comparative results across the region, aiming to assist the revenue bodies to improve their performance by providing opportunities to benchmark their administration against similar economies in the region. The comparable data and analysis are based largely on the 2020 round of the International Survey on Revenue Administration, for the 2018 and 2019 fiscal years.