Flat Tax
Tax Glossary Term
Definition
A flat tax applies a single, uniform rate to all taxable income regardless of how much you earn. While the US federal income tax is progressive with seven brackets, several states use a flat income tax. Pennsylvania charges 3.07%, Illinois charges 4.95%, and other flat-tax states include Indiana (3.05%), Michigan (4.25%), Colorado (4.40%), and Utah (4.65%). The appeal of a flat tax is simplicity — there are no brackets to navigate, and the math is straightforward: taxable income times the rate equals your tax. Critics argue flat taxes are less equitable because they take the same percentage from someone earning $30,000 as from someone earning $300,000, even though the lower earner has less disposable income after covering necessities. Proponents counter that a flat tax treats everyone equally and is easier to administer. Some states that historically used progressive brackets have moved to flat taxes in recent years, and several others are phasing down to flat rates. At the federal level, flat tax proposals surface periodically but have never been enacted. When comparing your total tax burden across states, it is important to look at the full picture. A state with no income tax may have higher sales or property taxes. The flat rate also means that deductions in flat-tax states save you less per dollar compared to deductions in higher progressive brackets.
Example
Pennsylvania flat tax:
Taxable income: $80,000
PA rate: 3.07%
State tax: $80,000 x 3.07% = $2,456
(Same rate whether you earn $20K or $200K)