The absence of a major tax is a common factor among many of the top 10 states. The 10 best states in this year’s Index are: While there are many ways to show how much is collected in taxes by state governments, the Index is designed to show how well states structure their tax systems and provides a road map for improvement. The Tax Foundation’s State Business Tax Climate Index enables business leaders, government policymakers, and taxpayers to gauge how their states’ tax systems compare.