| Summary: | The CBT database builds on an existing database which has been created in 2006 as a multi-country database and developed over the years by various Research Fellows at the Centre, and earlier at the Institute for Fiscal Studies. The original version uses various sources such as OECD Tax Database, IBFD (International Bureau of Fiscal Documentation), World Tax Database from the University of Michigan, KPMG and E&Y and covered mainly OECD countries. The data currently in the database comes from various sources, mainly from:
• The Worldwide Corporate Tax Guide published by E&Y; years available: 2002-2017
• data for 2011 - 2017 comes mainly from the online IBFD Tax Research Platform where they provide very detailed Country Surveys
• G20 countries data has been updated to be consistent with IBFD "Global corporate tax handbook" (years 2007 - 2010) and "European tax handbook" (years 1990 - 2010)
• ZEW Intermediate Report 2011, “Effective Tax levels using Devereux/Griffith methodology”
• Deloitte Tax Highlights and International Tax and Business Guide; years available: 2009, 2010
• KPMG Tax Rate Survey; years available: 1998 - 2009
• PKF Worldwide Tax Guide; years available: 2007 - 2009
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