Indiana County Income Tax Calculator

For an Indiana resident the county is generally fixed by where you lived on January 1 of the tax year, and it stays fixed for the whole year even if you move. Someone who lives outside Indiana but works in it generally uses the Indiana county of their principal place of work on January 1.

The built-in counties and their rates effective January 1, 2026 are: Marion County 2.02%, Lake County 1.50%, Allen County 1.59%, Hamilton County 1.10%, St. Joseph County 1.75%, Vanderburgh County 1.25%. Any other county can be modeled by entering its rate manually.

Indiana DOR publishes every county rate in Departmental Notice #1. Look up your county there and type the rate into the calculator — the estimate is then exactly what the withholding rate produces on the income you entered.

It is a separate levy but not a separate return. County income tax is reported on the same Indiana individual return as state tax, and employers withhold both together based on the county you declare on Form WH-4.

County rates are adopted by local income tax councils and published by DOR, and the rates this calculator uses take effect January 1, 2026. Check the current Departmental Notice #1 before updating payroll withholding or filing, since an adopting county can change its rate for a new year.

County tax applies to your Indiana county taxable income, which broadly follows Indiana adjusted gross income after applicable deductions and exemptions — not to gross pay. Enter that figure rather than your total salary for a realistic estimate.