The U.S. federal individual income tax was enacted in 1913 following the passage of the 16th Amendment. Today, most states and a small number of local and municipal governments also collect income taxes.
State Individual Income Tax Rates and Brackets for 2018
March 5, 2018
2018 State Business Tax Climate Index
October 17, 2017
Unpacking the State and Local Tax Toolkit: Sources of State and Local Tax Collections
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State Individual Income Tax Rates and Brackets for 2017