Useful IRS sites:
Tax Foundation provides information on tax policies and tax rates. Data can be downloaded in PDF or as an Excel spreadsheet. Some of the most useful data includes:
See KPMG’s Corporate and Indirect Tax Rate Survey 2014
Take a look at PricewaterhouseCoopers Worldwide Tax Summaries
Note: You will be asked to register for a free account to view this data.
Use World Development Indicators from the World Bank