Suits Index

The Suits index of a public policy is a measure of tax progressiveness, named for economist Daniel B. Suits. Similar to the Gini coefficient, the Suits index is calculated by comparing the area under the Lorenz curve to the area under a proportional line. For a progressive tax (for example, where higher income tax units pay a greater fraction of their income as tax), the Suits index is positive. A proportional tax (for example, where each unit pays an equal fraction of income) has a Suits index of zero, and a regressive tax (for example, where lower income tax units pay a greater fraction of income in tax) has a negative Suits index. A theoretical tax where the richest person pays all the tax has a Suits index of 1, and a tax where the poorest person pays everything has a Suits index of −1. Tax preferences (credits and deductions) also have a Suits index.

Read more about Suits Index:  Properties of Suits Indexes, Criticism, Examples of Suits Indexes

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Examples of Suits Indexes
... Tax Estimated Suits index Gasoline tax −0.25 Motor vehicle sales tax −0.14 Cigarette and tobacco excise taxes −0.486 State income tax (Minnesota) 0.21 ...

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