World Bank 
Integration of Revenue Administration [EPUB ebook] 
A Comparative Study of International Experience

In order to minimize the need for taxpayers to respond to multiple revenue agencies, some countries have integrated their revenue administrations, either by merging tax and customs administration, or unifying collection of tax and social contributions. This book examines the experience of 11 countries in doing so. Their experiences indicate that integrating collection entails modernizing the revenue administration and reducing contact between the tax office and taxpayers, thanks to the extensive use of ICT.