Documentation for a Comprehensive Historical U.S. Federal and State Income Tax Calculator Program

This paper provides documentation for a tax calculator program that models federal and state personal income taxes at a high level of detail for a large number of years. The current edition of the program covers federal personal income tax law from 1913 through 2009 (with projected future law through 2015), and state income tax laws from 1900 through 2007. The documentation explains the structure of the program, provides a variable-by-variable description of the data, and supplies references to sources of information on historical tax laws.