Residency Migration Reference
Moving from Illinois to Utah: Residency, Taxes, and What to Prove
The top income tax rate drops from 4.95% (flat) in Illinois to 4.45% in Utah. Establishing Utah residency correctly is what protects that benefit.
Residency Tests Side by Side
Illinois does not use a simple day-count threshold; it applies a facts-and-circumstances test instead. Utah's statutory residency test uses a 183-day threshold.
| Factor | Illinois | Utah |
|---|---|---|
| Statutory Residency 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. | Utah Code §59-10-103(1)(q) and Rule R865-9I-2 define a resident individual as either someone domiciled in Utah for any part of the tax year, or someone not domiciled in Utah who maintains a permanent place of abode in Utah and spends, in the aggregate, 183 or more days of the taxable year in the state. |
| Domicile Test | 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. | Utah's domicile statute, §59-10-136, is unusual among states: it lists automatic domicile triggers before reaching the general facts-and-circumstances test. An individual is considered domiciled in Utah if a dependent claimed on their federal return is enrolled in Utah public school, if the individual or spouse is a Utah resident student enrolled in a Utah higher-education institution, or if the individual or spouse votes in a Utah election in that tax year without having registered to vote in another state. Only if none of those triggers apply does the statute fall back to the general rule: a permanent home in Utah the person intends to return to, combined with voluntarily fixing habitation here for other than a special or temporary purpose, evaluated under a 'preponderance of the evidence' standard across a long list of factors including driver's license, the primary-residence property tax exemption, spouse or dependent presence, vehicle registration state, church or club membership, and mailing address on record. |
| Day Count Threshold | No fixed threshold | 183 days |
| Any Part of a Day Rule | Not applicable in the statutory sense, because Illinois has no day-count threshold for an individual to cross. There is no any-part-of-a-day rule to apply. Days still get counted in Illinois practice, both because 86 Ill. Adm. Code 100.3020(f) presumes residency above nine months in the aggregate and presumes continued residency where an individual is present in Illinois more days than in any other state, and because the Department of Revenue's audit division reconstructs presence from credit card, toll, and travel records to test whether time in Illinois was temporary or transitory. | Utah's current administrative rule (R865-9I-2, implementing §59-10-136) defines a countable day as one on which the individual spends more time in Utah than in any other single state, a majority-of-day standard rather than the any-part-of-a-day rule used in states like New York. This is a change from the Tax Commission's own 1997 advisory opinion (97-016), which stated under the prior statute that 'a fraction of a calendar day shall be counted as a whole day'; the current rule text supersedes that older, stricter reading. |
| 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. | None published beyond the domicile triggers described above; Utah does not publish a separate day-count presumption analogous to California's nine-month or New Mexico's 185-day rule. |
| Safe Harbors | None published | None published |
Leaving Illinois
Illinois is not in the top tier of aggressive exit-audit states the way New York or California are, but the Department of Revenue does examine departing high earners, especially where a large capital gain or business sale occurred near the claimed move date, or where the taxpayer kept an Illinois home, spouse, or business presence after claiming nonresidency. Auditors reconstruct day counts using credit card statements, toll records, airline records, and utility usage, and they cross-check the General Homestead Exemption against a claimed out-of-state domicile.
Trailing Income
Illinois does not have a convenience-of-the-employer rule, so a former resident who telecommutes for an Illinois employer from another state generally is not taxed by Illinois on those wages solely because the employer is based in Illinois; sourcing follows where the work is actually performed. Illinois does tax nonresident income that is Illinois-source, including compensation for services actually performed in Illinois, gain on the sale of Illinois real property, and a departing resident's share of Illinois business income allocated under the state's apportionment rules for the period they were still a resident or doing business in the state.
Part-Year Filing
Form IL-1040 together with Schedule NR, Nonresident and Part-Year Resident Computation of Illinois Tax, is used for the year someone moves into or out of Illinois. Schedule NR allocates income between the Illinois-resident portion of the year and the nonresident portion, and computes an Illinois tax based only on Illinois-source and Illinois-period income.
Enforcement Methods
Common Exit Mistakes
Establishing Utah Residency
| Action | Agency | Deadline |
|---|---|---|
| Get a Utah driver's license | Driver License Division (DLD), Utah Department of Public Safety | within 60 days of establishing residency |
| Title and register vehicles in Utah | Utah DMV, Utah State Tax Commission | within 60 days of establishing residency |
| Register to vote | Utah Lieutenant Governor's Office / county clerk | 11 days before an election for online or mail registration; same-day registration is available in person at an early voting location or vote center through Election Day |
Declaration of Domicile
Utah has no formal declaration-of-domicile filing comparable to Florida's. Because §59-10-136 treats specific acts (enrolling a dependent in Utah public school, voting in Utah without registering elsewhere, claiming resident-student status) as automatic domicile triggers, the fastest documented path to Utah domicile is often simply registering to vote here and not being registered anywhere else, combined with the general permanent-home-and-intent factors.
Homestead
Utah's homestead exemption under Utah Code §78B-5-503 automatically protects up to $42,000 of equity in a primary personal residence from most judgment creditors (versus $5,000 for property that is not the primary residence), without any filing requirement. This is a creditor-protection statute, not the same thing as the separate 45% primary-residence property tax exemption; together they mean Utah cross-checks 'primary residence' status through both the tax assessor's exemption records and, in a dispute, the homestead-exemption claim itself.
Voter Registration
Online or mail registration must be received by the county clerk 11 days before an election; Utah also allows same-day registration in person at an early voting location or vote center, including on Election Day. https://vote.utah.gov
Vehicle Registration Deadline
60 days
New Resident Tax Traps
Utah taxes a new resident's income from the date Utah domicile begins, which, per §59-10-136, can be triggered automatically and immediately by enrolling a child in a Utah public school or by voting in a Utah election in that same tax year, even before the person has moved most of their belongings or spent significant time in the state.
What Changes on Tax
Illinois Top Rate
4.95% (flat)
Utah Top Rate
4.45%
Moving from Illinois to Utah drops the top marginal income tax rate from about 4.95% to about 4.45%, a reduction of roughly 0.5 percentage points.
Withholding Reciprocity
Illinois and Utah do not have a wage-withholding reciprocity agreement with each other, so this move follows ordinary source-state and resident-state filing rules rather than a reciprocity exception.
Community Property Transition
Illinois and Utah both use common law, equitable-distribution marital property rules, so no community property transition applies to this move.
Beyond Income Tax
Illinois
Capital gains: No preferential rate. Capital gains are taxed as ordinary income at the same 4.95% flat rate as wages.
Estate or inheritance tax: Illinois has an estate tax with a $4 million exemption per estate that is not indexed for inflation and is not portable between spouses. Rates are graduated from roughly 0.8% up to 16% on the amount above the exemption. There is no separate inheritance tax.
Property tax: Illinois has the highest statewide effective property tax rate in the country, around 1.92% of home value, more than double the national median. The General Homestead Exemption reduces the taxable assessed value of an owner-occupied principal residence by up to $10,000 in Cook County, $8,000 in counties bordering Cook, and $6,000 elsewhere.
Sales tax: State base rate is 6.25%, but local home-rule and county taxes push combined rates as high as 11.5% in parts of Cook, Kane, and Warren counties; the effective statewide average is closer to 8.9%.
Utah
Capital gains: Taxed as ordinary income at the flat rate with no separate capital gains rate or general exclusion. Utah offers targeted, narrow credits elsewhere in the code (for example, an angel investor tax credit), but there is no broad long-term capital gains subtraction comparable to Arizona's or Colorado's.
Estate or inheritance tax: None. Utah has no estate tax and no inheritance tax.
Property tax: Effective rate is roughly 0.48% of value, among the lower rates nationally. Utah's primary-residence exemption reduces the taxable value of an owner-occupied home by 45%, so property tax is assessed on only 55% of fair market value; it applies automatically to a household's primary residence but not to second homes.
Sales tax: 6.10% state rate, with an average combined state-and-local rate of about 7.19% once city and county add-ons are included.
Who This Move Applies To
Travel Nurses
In Illinois
Illinois has no statutory day-count test to trip, so a travel nurse not domiciled in Illinois does not become an Illinois resident merely by crossing a day threshold on a long assignment. What creates exposure instead is the temporary or transitory question and the 100.3020(f) presumptions: an assignment structured as a series of renewals that keeps a nurse in Illinois more than nine months of a year, or more days than in any other state, supports a presumption of residency that must be rebutted by clear and convincing evidence, and the permanent or temporary nature of the work assignment is named in the rule as relevant evidence. The more common Illinois exposure is the reverse pattern, where a nurse claims a Florida or Texas tax home but actually lives in and pays Illinois-area rent for most of the year; Illinois-source wages for days actually worked in Illinois are taxable to any nonresident nurse regardless of claimed tax home.
In Utah
Salt Lake City and the Wasatch Front hospital systems (Intermountain Health, University of Utah Health) make Utah an active travel-nurse market. A nurse who is genuinely Utah-domiciled and takes Utah contracts is taxed as an ordinary resident. A nurse claiming a Utah tax home while working assignments elsewhere needs a real, regularly used, duplicated-expense Utah residence; Utah's own domicile factor list (driver's license, voter registration, mailing address) is the same list an IRS or state auditor would use to test whether a claimed tax home is genuine.
Professional Athletes
In Illinois
Illinois taxes nonresident professional athletes on a duty-day basis: Illinois-source income equals total compensation multiplied by the ratio of duty days in Illinois (games, practices, mandatory team functions) to total duty days for the season; mere travel through Illinois without a game or team event does not create a duty day. This applies to visiting teams playing the Bears, Bulls, Blackhawks, White Sox, and Cubs, and Illinois is regarded by practitioners as an aggressive, well-enforced jock-tax state that historically extended the tax reciprocally to any state that taxed Illinois-based athletes.
In Utah
The Utah Jazz (NBA) and Real Salt Lake (MLS) are Utah's major professional franchises, and nonresident athletes on visiting teams owe Utah tax on Utah duty days under standard apportionment against total season duty days. Utah's flat 4.45% rate keeps the jock-tax burden comparatively modest next to graduated-rate states.
Snowbirds, Long Visitors, and RVers
In Illinois
The Illinois snowbird risk runs entirely through the 100.3020(f) presumptions, not through a day threshold. A retiree who keeps the Illinois house and spends more than nine months there risks the nine-month presumption of residency, and a former Illinois resident is presumed to still be one in the following year if present in Illinois more days than in any other state, which is a comparison a snowbird splitting a year can lose well short of any traditional threshold. The favorable counterweight is Cain v. Hamer, 2012 IL App (1st) 112833, where retirees who split time nearly evenly (1,666 Illinois days against 1,700 Florida days across 1996 through 2004) were held nonresidents, with the court weighing nexus evidence such as Florida licenses, voter registration, a Florida declaration of domicile, club spending, and credit card data showing 73% of expenditures and 61% of transactions outside Illinois. Illinois's General Homestead Exemption is a specific cross-check point if a person claims Florida domicile but keeps the Illinois exemption active.
In Utah
Utah's Park City and Deer Valley resort corridor draws the same kind of second-home buyer as Colorado's mountain towns. Because the statutory 183-day test only applies to someone who is not domiciled in Utah but maintains a permanent place of abode here, an out-of-state owner of a Park City ski home needs to track aggregate Utah days against 183 using the state's majority-of-day counting rule; a day only counts as a Utah day if more time was spent in Utah than in any other single state that day, which is more forgiving than states using an any-part-of-a-day standard.
Remote Workers
In Illinois
Illinois has no convenience-of-the-employer rule. A nonresident who works remotely from another state for an Illinois-based employer is generally not taxed by Illinois on those wages, because Illinois sources employee compensation to where the services are physically performed, not to the employer's location. This makes Illinois meaningfully less sticky for remote workers than New York or a handful of other convenience-rule states.
In Utah
Utah has no convenience-of-employer rule: a nonresident performing all work physically outside Utah for a Utah-based employer is not Utah-taxed on those wages. Utah has been a significant landing spot for remote tech workers (the Silicon Slopes corridor between Salt Lake City and Provo) relocating from California and elsewhere; because domicile can be triggered automatically by voting or school enrollment under §59-10-136, remote workers who move mid-year should be deliberate about the order in which they register to vote and enroll children in school relative to their old state.
Military
In Illinois
Illinois follows the federal Servicemembers Civil Relief Act and Military Spouses Residency Relief Act. A servicemember whose home of record is Illinois remains an Illinois domiciliary for tax purposes regardless of duty station unless they take affirmative steps to change domicile, while a servicemember stationed in Illinois on orders, and their qualifying spouse, does not become an Illinois resident solely because of the posting, and military pay is not Illinois-source income for a nonresident servicemember stationed there.
In Utah
Utah follows the federal Servicemembers Civil Relief Act and Military Spouses Residency Relief Act. Hill Air Force Base, north of Salt Lake City, is a major installation; a service member stationed in Utah under orders does not become Utah-domiciled from the posting alone, and Utah offers a full exemption for active-duty military pay along with credits addressing military retirement income.
Airline Crew
In Illinois
Federal law (49 U.S.C. §40116) limits states to taxing airline employee compensation only in the employee's state of residence and any state where more than 50% of pay is earned. This protects flight crew based at O'Hare or Midway who are domiciled outside Illinois from having their full compensation pulled into Illinois taxation solely because their duty station is in Illinois.
In Utah
Salt Lake City International Airport (SLC) is a major hub for Delta Air Lines and the primary base for regional carrier SkyWest Airlines, giving Utah a substantial resident airline crew population. Federal law (49 U.S.C. §40116) limits state taxation of air carrier employees to their state of residence and any state where they earn more than 50% of their pay.
Tools for This Move
Illinois to Utah 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.
Does Utah use the 183-day rule?+
Yes, but only as a backstop to domicile. If you're not domiciled in Utah, you still become a statutory resident if you keep a permanent place of abode in Utah and spend 183 or more days here in the aggregate during the year. Utah counts a day toward that total only if you spent more time in Utah that day than in any other single state, a more forgiving standard than states that count any part of a day.
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.
If I enroll my kid in a Utah public school, does that make me a Utah resident for tax purposes?+
It can, automatically. Utah Code §59-10-136 treats a dependent's enrollment in Utah public kindergarten, elementary, or secondary school as an automatic domicile trigger for the parent claiming that dependent, independent of the general intent-based domicile test, unless a specific noncustodial-parent exception applies.
Does Illinois have a convenience-of-the-employer rule for remote workers?+
No. Illinois sources employee wages to where the work is physically performed, not to where the employer is headquartered. A nonresident who works remotely from another state for a Chicago-based employer generally is not taxed by Illinois on those wages, which is a meaningful difference from convenience-rule states like New York, and it means remote workers face less Illinois exposure after moving away than they might expect.
Can voting in Utah make me a Utah tax resident even if I haven't moved everything yet?+
Yes. If you or your spouse vote in a Utah election in a given tax year and have not registered to vote in another state, that alone establishes Utah domicile under §59-10-136(1)(a)(iii), regardless of how much of the year you actually spent in Utah.
How do I file my Illinois taxes for the year I move out of state?+
File Form IL-1040 together with Schedule NR, the Nonresident and Part-Year Resident Computation of Illinois Tax. Schedule NR splits your income between the period you were an Illinois resident, which is taxed in full, and the period after you became a nonresident, when only Illinois-source income is taxed. Skipping Schedule NR and simply filing as a full-year nonresident in your move year is a common and easily flagged mistake.
I own a ski condo in Park City but I'm domiciled elsewhere. How many days can I spend there before Utah taxes me?+
Up to 183 days in the aggregate during the year, using Utah's majority-of-day counting rule where a day only counts if you spent more time in Utah that day than anywhere else. Cross the 183-day line while keeping a permanent place of abode (owned or leased) in Utah, and the statutory residency test applies regardless of your domicile elsewhere.
I work in Illinois but live in Wisconsin. Do I have to file two state returns?+
Illinois has reciprocity with Wisconsin, Iowa, Kentucky, and Michigan, so a Wisconsin resident working in Illinois generally does not owe Illinois tax on those wages and should not have Illinois tax withheld; instead, only Wisconsin taxes that income. If Illinois tax was withheld in error, you file for a refund from Illinois rather than claiming a credit, and you report the income on your Wisconsin return as usual.
What form do I file if I only lived in Utah part of the year?+
Form TC-40 together with Schedule TC-40B, which apportions your income between the period you were a Utah resident and the period you were not.
Will keeping the homestead exemption on my Illinois house hurt me if I claim Florida residency?+
Yes, it's a direct contradiction auditors specifically look for. The General Homestead Exemption requires the property to be your owner-occupied principal residence as of January 1, so continuing to receive it while filing as an Illinois nonresident and claiming Florida domicile undercuts your own position. If you've genuinely moved, removing the exemption is one of the concrete steps that supports your new domicile claim.
Does Utah tax Social Security?+
Yes, at the flat rate, but a Social Security Benefits Tax Credit equal to the flat rate applied to your federally taxable Social Security largely or entirely offsets the tax for filers with modified AGI at or below roughly $54,000 single or $90,000 married filing jointly. Above those thresholds the credit phases out and more of your Social Security is effectively taxed.
Planning the reverse move?
Utah to Illinois
Moving the other direction is a different fact pattern, not a mirror image. Establishing Illinois residency has its own tests, deadlines, and audit posture.
Start with the Illinois residency guideAlso Consider, Leaving Illinois
Illinois to Utah Reading
Reviewed Against 29 Primary Sources
ResidencyIQ organizes public residency research into a reviewable reference. It does not provide legal or tax advice. Consult a qualified professional before making a residency decision.
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