Track Illinois Tax Residency

Understand Illinois residency requirements for state tax purposes

183

days — the count this guide turns on

The day threshold that comes up most in Illinois's rules, as described below. Confirm the current rule with the official sources at the bottom of this page.

Illinois residency requirements

Domicile Test for Illinois State Tax

The Illinois Department of Revenue (also known as the IL Dept of Revenue or Illinois Revenue Service) primarily determines tax residency through the domicile test. Your domicile is your true, fixed, and permanent home where you intend to return whenever absent. The IL Dept of Rev considers factors such as the location of your family, business interests, voter registration, and driver's license. Even if you leave Illinois temporarily, you may still be subject to Illinois state income tax if your domicile remains in the state.

183-Day Presence Test for Illinois Tax

In addition to the domicile test, Illinois applies a physical presence test for state tax purposes. You're considered a resident for Illinois tax if you spend more than 183 days in the state during a tax year, even if your domicile is elsewhere. This test affects individuals who spend significant time in Illinois but haven't established domicile. Accurate day tracking is crucial to avoid unexpected State of IL tax consequences.

Part-Year Residency and Illinois State Income Tax

The Illinois Revenue Service recognizes part-year residency for individuals moving into or out of the state during the tax year. As a part-year resident, you're subject to Illinois tax on all income earned while a resident, plus any Illinois-source income earned as a non-resident. You'll need to file Form IL-1040 and Schedule NR with the IL Dept of Rev to report your income and determine your tax liability for your residency period.

Illinois Non-Resident Income Tax and Reciprocal Agreements

Illinois has reciprocal agreements with Iowa, Kentucky, Michigan, and Wisconsin, affecting Illinois non-resident income tax. If you're a resident of one of these states but work in Illinois, you may be exempt from Illinois state tax on your wages. However, this doesn't apply to other income types, such as rental income from Illinois property. File the appropriate exemption forms with your employer to avoid Illinois tax withholding.

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Official Illinois resources

Links open the official Illinois sources in a new tab.

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