State Residency Change to Florida: The Domicile Framework and the Departing-State Audit

State residency is a state-law question separate from federal tax residency. Every state that levies an income tax defines its own resident, its own day counts, and its own factor test for whether a person is domiciled there, and no federal statute overrides that definition. Florida and Texas have no state income tax at all, so there is no Florida resident to become for income tax; the point of a Florida or Texas move is to STOP being a resident of the state left behind.

That framing matters because the audit risk is asymmetric. Florida will not question a move in; the departing state will. California, New York, and New Jersey run some of the most aggressive residency audit programs in the country, and their examiners look at physical presence, where the taxpayer's permanent home is, and where the family and personal center of life sit, all against records the taxpayer keeps in the ordinary course of life. For the planning side of that decision, see our advisory solutions.

The IRS decides one question: are you a US person for federal income tax. "You are a resident of the United States for tax purposes if you meet either the green card test or the substantial presence test for the calendar year (January 1 - December 31)."^[10] A citizen or green card holder is a US person regardless of which state carries the driver's license, and moving from Los Angeles to Miami does nothing to that status.

State residency is a different question with a different decider. Each state's tax agency runs its own test using its own statute and its own case law, and the federal answer is not binding on the state answer. A person can be a US resident for federal tax and a nonresident of the departing state at the same time, which is exactly the position a real Florida or Texas move puts a taxpayer in. What ties the two questions together is the concept of residency itself, and here the federal framework is instructive: it names the factors, and states largely reach for the same ones.

The substantial presence test is a day-count formula. The IRS test requires physical presence in the United States on at least 31 days during 2025 and 183 days across the 3-year period that includes 2025, 2024, and 2023, counting all current-year days, 1/3 of the days present in 2024, and 1/6 of the days present in 2023.^[1] The current year gets full weight, the prior year gets a one-third weight, and the second prior year gets a one-sixth weight, so a filer whose presence tapers off across three years passes out of residency gradually rather than at a stroke.

Days are counted at the calendar-day level, not the hour: "You are treated as present in the United States on any day you are physically present in the country at any time during the day."^[2] A morning arrival and a late-evening departure are each a full day. States that use day-count tests apply the same 24-hour convention, so a taxpayer who plans a move by hours or fractions of a day is planning against the wrong measure. The concept extends: every state that runs a day-count residency test measures physical presence, not tax intent.

Underneath the day count sits the concept of a tax home. "Your tax home is the general area of your main place of business, employment, or post of duty, regardless of where you maintain your family home. Your tax home is the place where you permanently or indefinitely work as an employee or a self-employed individual."^[3] The IRS uses this definition to decide who has ties strong enough to be treated as a US resident, and the same idea reappears in every state audit: where does the taxpayer actually work, indefinitely, and where does the professional life sit.

That is why a move only on paper rarely holds up. A California engineer who leases a Miami condominium but continues to report to a San Jose office, whose direct deposit still lands in a California branch, and whose team meetings are still on Pacific time has not moved a tax home; the tax home is still where the work is indefinitely rooted. Where the tax home is, is one of the two prongs of the federal closer connection test.^[4] A state auditor building the case that the move was a fiction reaches for the same evidence.

The IRS closer connection framework spells out the factors that measure where a person's life really sits, and this factor list is essentially the same list a state residency audit compiles. The publication lists the facts and circumstances include, but are not limited to, the following:^[5]

Every one of these factors also shows up on the departing state's residency-audit questionnaire, though the vocabulary differs. Permanent home becomes the state's statutory place-of-abode concept; business activities becomes the center of the taxpayer's active trade or business; family becomes the residence of the spouse and the minor children. The framework is the same because the underlying question is the same: is the person's life anchored here.

One detail is easy to underestimate: "It does not matter whether your permanent home is a house, an apartment, or a furnished room. It also does not matter whether you rent or own it. It is important, however, that your home be available at all times, continuously, and not solely for short stays."^[6] Keeping the old house available, empty, and furnished across the state line is exactly the fact pattern a state auditor cites as continued residency. If the old residence is retained for a spouse, an adult child, or a business use, the taxpayer's own presence in that residence any part of the year keeps it available.

Federal residency has a default end date and an earlier-end alternative. The IRS says the residency termination date is December 31 unless the taxpayer qualifies for an earlier date.^[7] The earlier date is available where the taxpayer's presence and closer contacts have shifted before year end, and "You can use this date only if, for the remainder of 2025, your tax home was in a foreign country and you had a closer connection to that foreign country."^[7] The federal framework, in other words, refuses to accept a mid-year departure that is not paired with an actual mid-year shift of the tax home and the personal center of gravity.

States apply the same logic to a state move. The default assumption is a full-year residency of the departing state; a partial-year residency ends only if the taxpayer can show that the tax home and the personal center of life moved to the new state on a specific date, and that everything after that date was consistent with residency in the new state. A move-out date has to have real facts under it, and one weekend in a Florida rental followed by six months of Manhattan Zoom calls is not one of them.

The departing state does not need to prove a move was fake. It only needs the taxpayer to fail to prove a move was real, and the burden of proof sits on the taxpayer. That inversion is what makes residency audits so grinding: the state issues an information request, the taxpayer has to produce documented evidence for the year of the move and often for the year after, and every gap in the record is a fact the auditor gets to construe against the change.

What the auditor typically asks for is the record every one of the closer connection factors leaves behind: airline itineraries and boarding passes, credit-card statements showing where transactions were incurred, EZ-Pass and toll records, cellular tower data, utility bills at both residences, medical and dental appointments and their locations, gym check-ins, lease or deed on the new residence, driver's license and voter registration dated by issuance, professional license changes, and the location of the spouse and any dependents. A residency audit is a records audit; the answer is decided by what the paper trail shows, not by the taxpayer's testimony about intent. Household filers approaching this level of scrutiny for the first time often bring the file to our individual tax return preparation team along with the return.

The direct cost is the tax on all of the year's income, computed as if the taxpayer never left, plus interest from the original due date. Investment income and capital gains realized after the purported move date are taxed by the departing state, which for a large exit realization can dwarf the tax on wages. On top of the tax and interest, the state can assess accuracy-related and negligence penalties where its examiners conclude that the residency position on the return was not supportable, and civil fraud penalties in extreme cases where the record shows willful misstatement.

A second cost is that a lost audit opens the door to earlier and later years. States generally have a three-year statute for a correctly filed nonresident return, but if the state's finding is that the taxpayer was actually a resident and either failed to file a resident return or filed the wrong one, the statute may not have started at all, and every open year is on the table. A single lost audit can turn one year of tax into three or four. A high earner whose sale of a business or a large stock position was timed for the year after the move has the most exposure, because it is the sale that pays for the audit. Households modeling a large gain around a move should read our the Section 121 home sale exclusion before assuming state timing works out.

The failure patterns are consistent. The taxpayer keeps the old residence available: unsold, unrented, or rented back for periodic stays. The spouse or a dependent child remains in the old state for schooling or work, and the taxpayer visits every month. The driver's license, voter registration, or vehicle registration is not switched, or is switched months late, so the paper trail says the move happened in November when the tax position claims April. The taxpayer maintains the same medical, dental, and personal-services providers in the old state, and the appointments are in the audit record. The primary bank account keeps its old-state branch, and the direct deposit goes there. The move is announced to friends but not to any of the institutions that keep records.

The subtler failure is professional: the taxpayer continues to serve clients, sit on boards, or manage a business physically located in the old state. The federal factor list is explicit that business activities other than those that constitute the tax home count as ties.^[5] A move that is real for personal life but not for business ties frequently loses on the business half of the record, because the business is where the audit's paper trail is richest. This is often the deciding factor in a Florida or Texas move for a founder or an executive, and a case our professional services tax help team sees regularly.

In the year of a move, the taxpayer often owes a partial-year resident return to the departing state and, if the destination has a state income tax, a partial-year resident return there. A Florida or Texas destination removes the second return, but the departing-state return still has to allocate the year's income between the two halves. Wages earned before the move date are sourced to the old state; wages earned after are not. Investment income is generally sourced to the state of residence at the time the income was realized, which is where the move date matters most.

Dual residency is the harder scenario: two states each claim residency for the full year. This happens when the departing state's statute treats the taxpayer as a resident by domicile while the destination state's statute treats the taxpayer as a resident by physical presence. Federal law provides no tie-breaker, and the taxpayer can end up owing two full-year resident returns with limited credit for taxes paid to the other state. Households moving into that risk are exactly where planning belongs, not compliance. Anyone unwinding an unfiled prior year alongside a move should also read our how to file back taxes and unfiled returns.