Residency Migration Reference
Moving from Idaho to New York: Residency, Taxes, and What to Prove
Idaho's 5.30% top income tax rate becomes 10.9% (state); NYC residents add up to 3.876% city tax in New York. This move trades a lighter tax environment for a heavier one, so timing income around the transition year matters.
Residency Tests Side by Side
Idaho uses a 270-day statutory residency threshold, while New York uses 183 days. Track both thresholds separately during a transition year rather than assuming they line up.
| Factor | Idaho | New York |
|---|---|---|
| Statutory Residency Test | Idaho Code §63-3013 defines a resident as an individual either domiciled in Idaho for the entire taxable year, or someone who maintains a place of abode in Idaho for the entire taxable year and spends in the aggregate more than 270 days of the taxable year in Idaho, a materially higher threshold than the 183-day test most states use. Presence within the state for any part of a calendar day counts as a full day toward that 270-day total. | Tax Law §605(b)(1)(B): a person not domiciled in New York is still taxed as a statutory resident on worldwide income if they (1) maintain a permanent place of abode in New York for substantially all of the taxable year and (2) spend more than 183 days of the taxable year in New York. Both prongs must be met; exactly 183 days does not trigger the test. |
| Domicile Test | Idaho defines domicile administratively (IDAPA 35.01.01.030 and the Tax Commission's public guidance) as the place that is the center of an individual's personal and business life, the permanent home a person intends to return to whenever absent. An individual can have multiple residences but only one domicile at a time, and once established, domicile persists until it is affirmatively abandoned, a new one is acquired, and the person is actually living in the new domicile. Evidence weighed includes where the family lives, comparison of homes in different states, where business activity occurs, how time is actually spent during the year, where sentimentally important belongings are kept, and whether the person has given up an Idaho driver's license or the Idaho homeowner's exemption. | New York's Nonresident Audit Guidelines and the Tax Department's own analysts weigh five primary factors: the size, cost, and use of the home in each location; time spent in each location; the location of active business involvement; the location of near and dear personal items; and where family (spouse and minor children) live. No single factor controls; the inquiry is a facts-and-circumstances read on genuine intent, per Hodgson Russ's published residency audit guidance. |
| Day Count Threshold | 270 days | 183 days |
| Any Part of a Day Rule | Yes. Idaho Code §63-3013(1)(b) explicitly states that presence within the state for any part of a calendar day counts as a full day toward the 270-day aggregate threshold, the strict any-part-of-a-day standard. | Yes. Under 20 NYCRR 105.20, presence in New York for any part of a calendar day counts as a full day, including a layover, a lunch meeting, or landing after midnight. Narrow exceptions exist for people in New York solely for medical treatment or solely passing through en route to somewhere outside the state, but there is no general travel-through carve-out. |
| Presumptions | None published as a separate presumption distinct from the domicile-plus-270-day statutory test; Idaho instead runs its 445-day absence safe harbor (below) as the primary mechanism for domiciled Idahoans to be treated as nonresidents. | There is no separate day-count presumption beyond the two-prong statutory test itself. Since 2022, Tax Department audit guidelines define 'substantially all of the taxable year' for the permanent-place-of-abode prong as a period exceeding 10 months (previously 11 months), which makes it slightly easier for a part-year abode to fall outside the test. |
| Safe Harbors | 445-day absence exception | 548-day rule |
Leaving Idaho
Idaho is not commonly named among the states practitioners flag as aggressive on residency (California, New York, New Jersey, Connecticut, Maryland, Minnesota), but its 445-day absence exception has built-in disqualifiers that create real exposure for people who assume a long posting abroad or out of state automatically converts them to nonresident status. The exception is unavailable if a spouse or minor children keep living in an Idaho home more than 60 days a year, if the person claims Idaho as their federal tax home for away-from-home expense deductions, or in specific federal-employment situations, which means a family that stays behind in Idaho while one spouse works elsewhere does not get the safe harbor even after a long absence.
Trailing Income
Idaho-source income, including income from Idaho real property, an Idaho business, or work physically performed in Idaho, remains taxable to nonresidents after departure. Idaho has no convenience-of-employer rule reaching remote workers who have genuinely relocated, and interstate rail and motor carrier employees with regularly assigned duties in more than one state are, by federal law, taxable only in their state of residence rather than every state they pass through.
Part-Year Filing
Form 43, the Idaho Part-Year Resident & Nonresident Income Tax Return, used to report income while an Idaho resident plus any Idaho-source income earned before arriving or after leaving; spouses with different residency status who file a joint federal return must also file a joint Idaho Form 43.
Enforcement Methods
Common Exit Mistakes
Establishing New York Residency
| Action | Agency | Deadline |
|---|---|---|
| Exchange out-of-state driver license for a New York license | DMV | within 30 days of becoming a resident |
| Register any vehicle kept in New York | DMV | within 30 days |
| Register to vote | New York State Board of Elections | must be a resident of the county for at least 30 days before Election Day; online registration deadline is set 10+ days before each election |
Declaration of Domicile
New York has no formal declaration-of-domicile filing comparable to Florida's county-level process. Domicile is established purely through conduct: home purchase or lease, DMV registration, voter registration, and the pattern of time actually spent, all assessed later under the same five-factor test used to challenge an exit.
Homestead
New York's STAR (School Tax Relief) program reduces school property tax on an owner-occupied primary residence. It is not an asset-protection homestead in the Florida sense, but it functions as strong domicile evidence because enrollment requires attesting the property is the owner's primary residence. The cross-check risk runs both ways: claiming STAR on a New York home while filing a nonresident return elsewhere invites Tax Department scrutiny, and applying for STAR on a newly acquired New York home is a data point supporting a claim of New York domicile.
Voter Registration
Register online, by mail, or in person at a county Board of Elections or the DMV at least 10 days before an election; New York requires county residency of at least 30 days before Election Day. https://elections.ny.gov/register-vote
Vehicle Registration Deadline
30 days
New Resident Tax Traps
A new full-year resident is taxed on worldwide income starting the date New York residency begins; a mid-year move is handled on Form IT-203 by allocating income to the resident and nonresident periods. Anyone moving into the five boroughs should also plan for the added NYC resident income tax, which applies to domiciliaries and statutory residents of the city, not just the state.
What Changes on Tax
Idaho Top Rate
5.30%
New York Top Rate
10.9% (state); NYC residents add up to 3.876% city tax
Moving from Idaho to New York raises the top marginal income tax rate from about 5.3% to about 10.9%, an increase of roughly 5.6 percentage points.
Withholding Reciprocity
Idaho and New York 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
Idaho is a community property state and New York uses common law marital property rules. Property already characterized as community property generally keeps that character after the move, subject to the destination state's quasi-community-property treatment, while future acquisitions follow New York's common law rules.
Beyond Income Tax
Idaho
Capital gains: Taxed as ordinary income at the flat rate, but Idaho allows a deduction of 60% of the net capital gain from the sale of qualifying Idaho property under Idaho Code §63-3022H. Qualifying property generally means Idaho real property held at least 12 months (18 months if sold before January 1, 2005), or certain business assets, cattle, and horses held for the required period; the deduction is claimed on Form CG and does not apply to gains on out-of-state property or most financial assets.
Estate or inheritance tax: None. Idaho has no estate tax and no inheritance tax.
Property tax: Effective rate is roughly 0.50% of value. Idaho's Homeowner's Exemption exempts 50% of a primary residence's assessed value up to a $125,000 cap (Idaho Code §63-602G), but unlike an automatic homestead protection this requires an affirmative application with the county assessor and lasts only until ownership changes or the home stops being the owner's primary residence, making it an easy domicile cross-check point.
Sales tax: 6.00% state rate, with a low average combined state-and-local rate of about 6.03%, since Idaho has very limited local-option sales taxes (mostly a handful of resort cities).
New York
Capital gains: No preferential rate. Capital gains are taxed as ordinary income at the same graduated brackets, so a New York City resident in the top brackets can face a combined state and city rate approaching 14.8% on gains before federal tax.
Estate or inheritance tax: New York has an estate tax but no inheritance tax. The 2026 basic exclusion amount is $7,350,000. New York uses a cliff: once a taxable estate exceeds about 105% of the exclusion ($7,717,500 in 2026), the exclusion disappears entirely and the full estate value is taxed, not just the excess.
Property tax: Effective rates vary enormously by locality, from under 1% in parts of New York City (where assessment caps suppress bills) to over 2% in many upstate counties. The STAR program reduces school-tax liability on an owner-occupied primary residence and is one of the first places auditors look when a taxpayer claims nonresident status while still benefiting from it.
Sales tax: State rate is 4%, and combined state-plus-local rates average around 8.5% statewide; New York City's combined rate is 8.875%.
Who This Move Applies To
Travel Nurses
In Idaho
Boise's hospital systems and Idaho's rural-hospital travel contracts make the state a modest but real travel-nurse market. A nurse genuinely domiciled in Idaho who takes Idaho contracts is simply taxed as a resident. A nurse claiming an Idaho tax home while working elsewhere needs a real, regularly used, duplicated-expense Idaho residence; claiming Idaho as a federal away-from-home tax home while also trying to use the 445-day absence exception for Idaho state tax purposes is explicitly disqualifying under Idaho's own rule, so the two claims cannot be made consistently.
In New York
New York applies its statutory residency test the same way to a travel nurse as to anyone else: a nurse on assignment who is not domiciled in New York but keeps a New York abode for substantially all the year and works more than 183 days in the state becomes a statutory resident taxed on worldwide income. The more common New York exposure runs the other direction, when a nurse claims a Florida or Texas tax home but the facts show the real permanent place of abode is the New York apartment they actually live in during assignments; auditors look at lease length, utility bills in the nurse's name, and whether the claimed home state was ever actually occupied.
Professional Athletes
In Idaho
Idaho has no major professional sports franchise in the four big US leagues, so jock-tax exposure runs almost entirely one direction: Idaho-domiciled or Idaho-resident athletes are taxed on income earned while playing in other states under those states' own apportionment rules, and nonresident athletes visiting Idaho for occasional events owe Idaho tax on Idaho-source duty days under the state's standard nonresident income sourcing.
In New York
New York originated the modern jock tax, and both the state and New York City tax nonresident athletes on a duty-days basis: New York-source income equals total compensation multiplied by the ratio of duty days spent in New York (games, practices, mandatory appearances, and required travel) to total duty days for the season. New York City separately taxes nonresident athlete earnings at up to 3.876%. This applies to visiting players at Yankee Stadium, Citi Field, Madison Square Garden, and Barclays Center, as well as to the home-team rosters of the Yankees, Mets, Knicks, Nets, Rangers, Islanders, Bills, Giants, and Jets.
Snowbirds, Long Visitors, and RVers
In Idaho
Idaho's 270-day statutory threshold is unusually generous compared to the 183-day standard most states use, but it comes paired with the strict any-part-of-a-day counting rule, so a snowbird or long-term visitor who owns or leases an Idaho home needs to track every day with any Idaho presence, not just overnight stays, against that 270-day ceiling. Idaho's own seasonal-worker example (a couple splitting time between an Alaska fishing operation and an Idaho off-season home) shows the state applies the ordinary domicile-or-270-day test to seasonal residents just as it would to anyone else, with no special seasonal carve-out.
In New York
The classic New York snowbird risk is keeping a New York co-op or house while wintering in Florida. Under the post-2022 guidelines, an abode used for more than 10 months of the year can satisfy 'substantially all of the taxable year,' and Obus and its Appellate Division reversal show that even a vacation home used only two or three weeks a year can be argued either way depending on whether the taxpayer has genuine, continuous access and uses it as a residence rather than merely maintaining it. Combine that abode with more than 183 days physically in New York across the year, counting any part of a day, and statutory residency attaches regardless of where the person considers home.
Remote Workers
In Idaho
Idaho has no convenience-of-employer rule: a nonresident performing all work physically outside Idaho for an Idaho-based employer is not Idaho-taxed on those wages. Idaho, particularly the Boise metro area, has drawn a steady stream of remote workers relocating from higher-cost West Coast states since 2020; because Idaho and Washington are both community property states, a remote-working couple split between the two needs to account for the community-property income-sharing rule on their Idaho return, not just source-based sourcing.
In New York
New York's convenience of the employer rule is the single biggest trap for remote workers with a New York-based employer. If a nonresident employee works from home in another state for their own convenience rather than the employer's necessity, New York treats those days as New York workdays and taxes the income, frequently creating double taxation with the employee's home state. The Tax Appeals Tribunal reaffirmed the rule again in Matter of Zelinsky (2025); the only real escape is documenting a bona fide employer necessity, such as the employer having no New York office to work from.
Military
In Idaho
Idaho follows the federal Servicemembers Civil Relief Act and Military Spouses Residency Relief Act, and Idaho's own guidance walks through the distinction between military home of record and state of legal residence/domicile: a service member stationed in Idaho under orders (for example, at Mountain Home Air Force Base) is taxed based on domicile, not the posting, active-duty military pay is not Idaho-taxed for nonresident service members, and a nonmilitary spouse can independently be a resident, part-year resident, or nonresident depending on their own domicile and MSRRA elections.
In New York
New York generally follows the federal Servicemembers Civil Relief Act and Military Spouses Residency Relief Act: a servicemember stationed in New York on orders does not become a New York domiciliary solely because of the duty station, and military pay is exempt from New York tax for a nonresident servicemember stationed there. A servicemember who was domiciled in New York before enlisting remains a New York domiciliary unless they affirmatively change domicile.
Airline Crew
In Idaho
Boise Airport is not a major airline crew base, so Idaho's most relevant federal transportation carve-out runs to interstate rail and motor carrier employees rather than airline crew specifically: Idaho's guidance confirms that employees of interstate rail or motor carriers with regularly assigned duties in more than one state are, under federal law, taxable only in their state of residence, with the Idaho-earned portion of a nonresident's income remaining Idaho-taxable.
In New York
Federal law (49 U.S.C. §40116) limits states to taxing air carrier employee compensation only in the employee's state of residence and any state where the employee earns more than 50% of their pay. This protects flight crew based at a New York hub, such as JFK or LaGuardia, who are domiciled elsewhere from having their full income pulled into New York taxation solely because their duty station is there.
Tools for This Move
Idaho to New York FAQ
Does Idaho use the 183-day rule?+
No. Idaho's statutory residency threshold is 270 days, not 183, and any part of a calendar day with Idaho presence counts as a full day toward that total under Idaho Code §63-3013(1)(b). You're a statutory resident if you maintain a place of abode in Idaho for the entire year and hit that 270-day aggregate, independent of domicile.
If I rent apartments in both New York and Florida and go back and forth all year, how could the state ever prove I was in New York more than 183 days?+
New York's audit program is built for exactly this pattern. Auditors reconstruct day counts from cell phone location data, EZ-Pass toll records, credit and debit card statements, and even medical or veterinary appointments, then compare that reconstruction against your own return. Because any part of a calendar day in New York counts as a full day under 20 NYCRR 105.20, a single afternoon meeting can move the count. The burden of proof is on you, not the state, so the absence of your own contemporaneous records is itself a disadvantage in an audit.
I'm domiciled in Idaho but working out of state for years. Am I still an Idaho resident?+
Not necessarily, if you qualify for Idaho's 445-day absence exception: being out of Idaho for at least 445 days within a 15-month period lets a domiciled Idahoan be treated as a nonresident. But the exception doesn't apply if your spouse or minor children keep living in your Idaho home more than 60 days a year, or if you claim Idaho as your federal tax home for away-from-home expenses.
Does keeping an empty apartment in New York count against me if I've moved to Florida?+
It can, but it isn't automatic. Under Matter of Gaied, the Court of Appeals held that merely owning or holding the keys to a New York dwelling isn't enough to make it a permanent place of abode; there has to be evidence you actually use it as a residence. An apartment sitting genuinely empty and unused cuts against a permanent-place-of-abode finding. An apartment you or your family still stay in, even occasionally, is a much harder sell as abandoned.
How many months can I spend in Idaho as a snowbird before I owe Idaho income tax?+
Up to 270 days in the aggregate during the year, since Idaho's statutory residency test kicks in above that threshold for anyone maintaining an Idaho place of abode. But Idaho counts any part of a day as a full day, so short visits add up faster than in states with a majority-of-day rule.
Can I still visit my parents in New York after I claim residency somewhere else without it hurting my case?+
Visiting itself isn't the problem; day counting is. Every day you spend any part of in New York, including a day trip to see your parents, counts toward the 183-day statutory residency threshold if you also maintain a New York abode for substantially all the year. Occasional visits without a New York home available to you are lower risk. The combination of frequent visits and a place to stay, like a childhood bedroom you still use, is what auditors look for.
What form do I file if I only lived in Idaho part of the year?+
Form 43, the Idaho Part-Year Resident & Nonresident Income Tax Return. If you and your spouse have different residency statuses and file a joint federal return, you must also file a joint Idaho Form 43, with each spouse's status listed separately.
My employer won't update my payroll state after I moved out of New York. Am I stuck paying New York tax?+
Withholding address alone doesn't establish tax residency, but it does create a paper trail that contradicts your claimed move and can trigger a notice. More importantly, if you continue working remotely for a New York-based employer, New York's convenience of the employer rule can independently tax those wages as New York-source income unless the remote arrangement is a bona fide necessity of the employer, not just your own preference. Fixing the payroll address doesn't fix the convenience rule exposure; those are two separate problems.
Does Idaho tax Social Security?+
No. Idaho fully exempts Social Security benefits from state income tax. Other retirement income like pensions, 401(k), and IRA withdrawals is generally taxed at the flat 5.30% rate, though a separate Retirement Benefits Deduction covers qualifying public-system pensions for taxpayers 65 and older or 62 and disabled.
How does New York's convenience of the employer rule actually work for remote workers?+
If you're a nonresident who works from home for a New York-based employer, New York treats your home-office days as New York workdays, and taxes that income, unless you can show the remote work was a necessity for the employer rather than your own convenience. The Tax Appeals Tribunal reaffirmed this again in Matter of Zelinsky in 2025. The practical effect is that many remote employees of New York companies owe New York tax on nearly all of their income even though they never set foot in the state, which can also create double taxation with their home state.
Does Idaho have a capital gains tax break?+
Idaho taxes capital gains as ordinary income but allows a 60% deduction on net gains from qualifying Idaho property, generally real property held at least 12 months, claimed on Form CG. The deduction is specific to Idaho property; gains on out-of-state real estate or most stocks and financial assets don't qualify.
Is it true a New York residency case once turned on where a guy's dog lived?+
Yes. In Matter of Blatt, a CEO who relocated from New York City to Dallas for a new job won his residency case largely because he finally moved his elderly rescue dog to Texas, which the administrative law judge treated as the clearest evidence of genuine intent to relocate. It outweighed the Manhattan apartment he still owned and the boat he kept in the Hamptons, and it landed months before he got a Texas driver's license or registered to vote there. It's a real illustration of how New York's domicile test looks past paperwork to small, honest signals of where someone actually built their life.
Considering the reverse move?
New York to Idaho
Moving the other direction is a different fact pattern, not a mirror image: exit risk and establishment mechanics both flip.
View the New York to Idaho guideAlso Consider, Leaving Idaho
Idaho to New York Reading
Reviewed Against 36 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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