Flat or graduated personal income taxes have varying effects on the annual individual tax liabilities of taxpayers at different income levels. Less examined is how tax structures affect income inequality and racial wealth gaps. This brief illustrates how Illinois’s historic flat income tax structure compares to the proposed Fair Tax through a multi-year retrospective analysis. It shows that Illinois’s flat income tax in lieu of a graduated rate tax used by most states amounts to a tax subsidy for the wealthiest Illinoisans that compounds income inequality and racial wealth gaps.
