Two owners sell identical businesses for $10 million. One closes in May and moves to Florida in November. The other completed a genuine move eighteen months before signing. The first writes a state check that can run to seven figures — top rates in New York, New Jersey, and California run roughly 10.9%, 10.75%, and 13.3% — and the second, on the same facts otherwise, may owe that state nothing on the gain. Florida taxes neither of them: it has no personal income tax, a fact the Florida calculator puts in dollars.
The mechanics are unglamorous. Gain on the sale of stock or membership interests is intangible income, and intangible income is generally taxed by the state where you are a tax resident when the gain is recognized — not where the company operates, not where the buyer sits, not where you built it. Which is why the sequence — sell first or move first — is usually the single largest tax decision of the entire exit, larger than any structuring cleverness inside the deal itself.
Why “move in March, close in May” is not a plan
Residency for this purpose is not a driver’s license. It is domicile — a facts-and-circumstances judgment about where your life is actually centered: where your primary home is, where your spouse and children live, where the items you would rescue from a fire are kept, where your days are spent, where your business ties remain. A move that happens weeks before a closing, with the old house kept and the family still in it, is not a change of domicile. It is an invitation.
And the invitation gets accepted. High-tax states audit the departure year of large gains as a matter of routine — New York’s residency audit program is the most aggressive in the country — and the burden of proving the move is on you. The practical standard is not “did you file a Florida declaration of domicile” but “would a stranger reviewing your calendar, your cell records, and your credit-card statements conclude your life had actually moved?”
The trap that survives even a real move
Statutory residency is the second test, and it catches people who pass the first. Keep a “permanent place of abode” in the old state — the apartment you held onto, the house that has not sold — and spend more than 183 days there in the tax year, and New York (among others) taxes you as a resident anyway, domicile notwithstanding. A sale year is exactly when deal meetings, board obligations, and transition work pull you back. The day count has to be managed like a budget, with records kept as they happen, not reconstructed for an auditor two years later.
The deals a move cannot save
The clean result — intangible gain follows the seller — belongs to stock and equity-interest sales. Three common structures behave differently, and owners find out late:
Asset sales. When the company sells its assets, the gain is business income of the entity, apportioned to the states where the business actually operates. If the operations are in New York, moving the owner to Florida does not move the gain.
Deemed asset sales. A stock sale with a 338(h)(10) or 336(e) election — which buyers of S corporations routinely request, because it steps up their basis — is taxed like an asset sale. Sellers sign these elections for a purchase-price bump without pricing the state-tax consequence of converting portable intangible gain into apportioned business income. The election has a price; know it before you agree.
Earnouts, deferred compensation, and consulting tails. Anything the contract characterizes as payment for services — employment-linked earnouts, transition consulting, deferred comp — is generally sourced to where the services were or are performed, and the old state keeps its claim no matter where you live when the check arrives. Installment payments, by contrast, generally keep the character they had at closing: installments on a true stock sale follow the seller; installments on an asset or deemed-asset sale keep the old state’s flag on them.
One federal note that moves in your favor: if the company is a C corporation and the stock qualifies under Section 1202 (QSBS), a substantial part of the gain may be excluded from federal tax entirely — and recent legislation expanded those limits for newly issued stock. State conformity varies; Florida, having no income tax, makes the question moot on arrival. It is worth checking years before it is worth anything.
The calendar that actually works
Everything above compresses into one planning rule: the move must be complete, documented, and lived-in before the gain is recognized — and the further before, the stronger the file. In practice:
Two to three years out is the comfortable window: establish the Florida home as the primary residence, move the family’s center of gravity, file the declaration of domicile, re-register to vote and drive, move the physicians, the advisors, the congregation — and start the day-count log. This is also when structure questions (stock vs. asset positioning, QSBS eligibility, charitable and estate moves that must precede a letter of intent) are still open.
Under a year out, with a letter of intent already signed, the options narrow sharply: the move can still be real, but every fact will be examined in the light of the pending sale, and the services-flavored pieces of the deal are already what they are. Under a signed purchase agreement, the sequencing decision has effectively been made — usually by default, usually expensively.
Where this fits in the larger picture
The state question is one lever inside the larger exit: what the after-tax number really is, what the proceeds have to earn, and what the family’s life looks like on the other side — the work described on the business-owners page. The residency mechanics — homestead, the 183-day ledger, what Florida actually asks of you — are laid out in the Florida transplant guide and the residency essay. None of this is tax or legal advice; the execution belongs with your CPA and counsel, coordinated — which is precisely the seat we occupy for clients in this window.