Nothing impacts more on citizens than taxes, and nothing has had more impact on the way taxes are administered than the information technology revolution. This volume analyzes the experiences of a dozen or more countries in their effort to use information technology to improve taxpayer service, compliance and revenue performance. Administrative re-engineering using information technology is the order of the day. Information technology is changing the boundaries of tax administration from isolated single tax administrative units, to unified tax authorities that administer all taxes including the functions of customs. Information sharing by the many areas of tax administration is the key to reducing compliance costs borne by taxpayers, as well as enhancing the levels of voluntary compliance with tax laws.