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Illinois 183-Day Rule Checker
Illinois has no bright-line day-count residency test. Here is what actually controls, and what a day count does and does not prove.
Illinois's actual test
Illinois has no statutory residency test of the New York or Minnesota type: no bright-line day count and no permanent place of abode prong. 35 ILCS 5/1501(a)(20)(A) defines a resident as an individual '(i) who is in this State for other than a temporary or transitory purpose during the taxable year; or (ii) who is domiciled in this State but is absent from the State for a temporary or transitory purpose during the taxable year.' Those are the only two routes to Illinois residency for an individual. Cain v. Hamer, 2012 IL App (1st) 112833, shows how far that departure from a day count runs: snowbird retirees who spent 1,666 days in Illinois against 1,700 in Florida across 1996 through 2004, an average well above 183 Illinois days a year, were held not to be Illinois residents. Day counts matter in Illinois as evidence of purpose and as inputs to the administrative presumptions, not as a threshold that decides residency by itself.
Presumptions
86 Ill. Adm. Code 100.3020(f) supplies four rebuttable presumptions in place of a statutory day test. An individual who spends in the aggregate more than nine months of any taxable year in Illinois is presumed to be a resident. An individual absent from Illinois for one year or more is presumed to be a nonresident. An individual receiving a homestead exemption on Illinois property under 35 ILCS 200/15-175 is presumed to be an Illinois resident. And an Illinois resident in one year is presumed to be a resident the following year 'if he or she is present in Illinois more days than he or she is present in any other state.' The presumptions 'are not conclusive and may be overcome by clear and convincing evidence to the contrary,' with the rule listing acceptable rebuttal evidence including location of spouse and dependents, voter and vehicle registration, driver's license, filing a resident return elsewhere, home ownership or rental agreements, the permanent or temporary nature of work assignments, location of professional licenses, location of medical providers, accountants and attorneys, club memberships and participation, and telephone or other utility usage over a duration of time.
Domicile controls instead
Illinois follows the traditional common-law domicile standard under 86 Ill. Adm. Code 100.3020: domicile is the place a person intends as their true, fixed, permanent home, and to which they intend to return whenever absent. A person can have only one domicile at a time, and it continues until a new one is established through both physical presence in the new location and demonstrated intent to abandon Illinois as the permanent home. The Department of Revenue looks at where a person votes, holds a driver's license and registers vehicles, banks, keeps professional relationships (doctor, lawyer, accountant), works, houses family, and belongs to clubs or religious institutions; no single factor controls.
Methodology and sources
The threshold, presumption, and rule text shown here come directly from Illinois's researched dossier, reviewed against 18 primary sources including Illinois Department of Revenue. This is general information, not tax or legal advice.
183-Day Rule Checker
Check your day count against Illinois's actual rule.
Domicile controls
No statutory day-count test applies
Days counted
0
This jurisdiction does not run a bright-line day-count residency test. Domicile, the place you treat as your true, fixed, permanent home, controls instead, regardless of how many days you spend here.
Illinois's actual test
Illinois has no statutory residency test of the New York or Minnesota type: no bright-line day count and no permanent place of abode prong. 35 ILCS 5/1501(a)(20)(A) defines a resident as an individual '(i) who is in this State for other than a temporary or transitory purpose during the taxable year; or (ii) who is domiciled in this State but is absent from the State for a temporary or transitory purpose during the taxable year.' Those are the only two routes to Illinois residency for an individual. Cain v. Hamer, 2012 IL App (1st) 112833, shows how far that departure from a day count runs: snowbird retirees who spent 1,666 days in Illinois against 1,700 in Florida across 1996 through 2004, an average well above 183 Illinois days a year, were held not to be Illinois residents. Day counts matter in Illinois as evidence of purpose and as inputs to the administrative presumptions, not as a threshold that decides residency by itself.
Presumptions
86 Ill. Adm. Code 100.3020(f) supplies four rebuttable presumptions in place of a statutory day test. An individual who spends in the aggregate more than nine months of any taxable year in Illinois is presumed to be a resident. An individual absent from Illinois for one year or more is presumed to be a nonresident. An individual receiving a homestead exemption on Illinois property under 35 ILCS 200/15-175 is presumed to be an Illinois resident. And an Illinois resident in one year is presumed to be a resident the following year 'if he or she is present in Illinois more days than he or she is present in any other state.' The presumptions 'are not conclusive and may be overcome by clear and convincing evidence to the contrary,' with the rule listing acceptable rebuttal evidence including location of spouse and dependents, voter and vehicle registration, driver's license, filing a resident return elsewhere, home ownership or rental agreements, the permanent or temporary nature of work assignments, location of professional licenses, location of medical providers, accountants and attorneys, club memberships and participation, and telephone or other utility usage over a duration of time.
General information based on published dossier research, not tax or legal advice. Consult a qualified advisor before relying on a day count for a filing position.
Illinois Day-Count FAQ
Does Illinois have a 183-day rule like New York or Minnesota?+
No. This is the single most common misconception about Illinois residency. 35 ILCS 5/1501(a)(20) contains no day-count threshold and no permanent place of abode prong; a resident is someone in Illinois for other than a temporary or transitory purpose, or an Illinois domiciliary absent for a temporary or transitory purpose. What Illinois has instead are the rebuttable presumptions in 86 Ill. Adm. Code 100.3020(f), including a presumption of residency above nine months in the aggregate and a presumption that a prior-year resident remains one if present in Illinois more days than in any other state. The practical difference is real in both directions: crossing 183 Illinois days does not by itself make you a resident, and staying under 183 does not by itself make you a nonresident.
If I move to Florida but keep my Chicago condo, will Illinois still tax me?+
Keeping the condo does not by itself make you taxable, because Illinois has no permanent place of abode test that a retained condo could trigger. The risk runs through purpose and presumptions instead. If you spend more than nine months of the year in Illinois, or simply more days there than in any other state after a year as an Illinois resident, the Department gets a presumption of residency you can rebut only by clear and convincing evidence. Continuing to claim the General Homestead Exemption on the condo is worse than the condo itself, since that alone creates its own presumption of Illinois residency and is a cross-check Illinois auditors run directly against a claimed out-of-state domicile.
Does Illinois tax my pension or 401(k) withdrawals if I'm still a resident?+
No. Illinois fully exempts qualified retirement income from state tax, including Social Security, pension payments, and qualifying distributions from 401(k)s, 403(b)s, 457(b)s, and IRAs, with no age requirement and no income cap. This is one of the more retirement-friendly features of Illinois tax law and is a genuine reason some retirees stay rather than chase a no-income-tax state.
How does Illinois tax a visiting NBA or NFL player who plays one game in Chicago?+
Illinois uses a duty-day formula: the player's total season compensation is multiplied by the ratio of Illinois duty days, which include games, practices, and mandatory team functions, to total duty days for the season. A single game in Chicago against the Bulls, Bears, or another Illinois team creates Illinois-source income taxable on a nonresident basis, and Illinois is considered one of the more aggressively enforced jock-tax states.
How much do day counts actually matter in Illinois?+
They matter as evidence and as presumption inputs, not as a threshold. Because Illinois sets no statutory day limit, there is no line where one more day flips your status, and no any-part-of-a-day rule attached to such a line. Days still decide two things that count: whether you exceeded nine months in Illinois in the aggregate, and whether Illinois was simply your highest-day state. Cain v. Hamer is the reminder that the comparison is what matters, since retirees averaging more than 183 Illinois days a year were still held nonresidents on the strength of their Florida connections. Illinois auditors reconstruct presence from credit card, toll, and travel records to test the purpose of your time, so the count is worth keeping accurately even without a threshold to clear.
Read the full Illinois residency guide
Day count is one part of the picture. The full guide covers domicile, exit audit risk, the establishment checklist, tax profile, and special situations for Illinois.
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