Plenty of New Englanders own a house up here and a house down south. Sometimes the reason is the weather. Often the reason is taxes. And a decision the Connecticut Supreme Court handed down on June 16, 2026 just made the tax side of that equation a little friendlier for the snowbird crowd.

Why Florida is a retirement mecca

Florida has no estate tax. None. When you die a Florida resident, your wealth passes to your heirs without the estate—or the people you leave it to—paying a state-level death tax on it. That’s a big part of why so many retirees plant a flag in the Sunshine State.

Connecticut is different. We do have an estate tax. The good news is that there’s a lot of cushion built in: for 2026 the Connecticut exemption is $15 million per person, matching the new federal number. If your estate comes in under that, Connecticut takes nothing. Above it, the state takes a flat 12% on the excess.

So for most families, the Connecticut estate tax never enters the picture. But if you’re sitting on more than $15 million, the math changes, and suddenly where you legally lived when you died becomes a multimillion-dollar question.

This isn’t just a problem for the ultra-wealthy

Here’s the thing people miss. The same logic applies—and bites much harder—in low-threshold states. Take Massachusetts, where my office sits. The Massachusetts estate tax kicks in at just $2 million. There’s no portability between spouses, and once you cross the line, Massachusetts taxes a large chunk of the estate, not just the slice above $2 million.

Two million dollars is not a yacht-and-private-jet number. Add up a paid-off house in Greater Boston, a retirement account, some life insurance, and a brokerage account, and a perfectly ordinary family can land over that mark without ever feeling rich. So the question—is my estate “located” in Massachusetts, or somewhere with no estate tax?—reaches a lot more people than you’d think.

And the answer to that question is: it depends on where you were domiciled.

Domicile is a legal term, not a common-sense one

This is where people get tripped up. “Domicile” sounds like a fancy word for “where you live,” but in the law it means something more specific.

Your domicile is your one true, permanent home—the place you intend to return to whenever you’re away. Its whole job is to tie you to a single place. You can have as many residences as you can afford, but you can only have one domicile at a time.

Legally, domicile comes down to two things happening together: (1) you’re actually present in the place, and (2) you intend to stay there indefinitely. Classic example: if you leave Pennsylvania for a temporary job in New York but plan to head home to Pennsylvania when it ends, you stay a Pennsylvania domiciliary the whole time. Your body is in New York; your domicile never left Pennsylvania.

Because intent is invisible, courts figure it out by looking at the totality of the circumstances—the whole picture of how you actually live. They’ll look at things like:

• Where your primary residence is
• Where you’re registered to vote, and where you actually vote
• Where you pay taxes
• Where your real estate and personal property are located
• Your driver’s license and vehicle registrations
• Where your bank and brokerage accounts are held
• Where you work
• Where your spouse and family are
• What clubs, churches, and organizations you belong to

And critically: these factors don’t all count equally. Where you spend the majority of your time and where you vote tend to carry more weight than a piece of paper. A formal declaration of domicile—the “I hereby declare I’m a Floridian” form—gets considered, but it isn’t the final word. If your declaration says Florida but your conduct says Connecticut, conduct usually wins.

That’s the part to sit with: proving domicile is not as simple as “I pay taxes here” or “my family is here.” Those are factors used to prove domicile in a courtroom—not the whole answer.

Why this turns into a fight

Domicile becomes a battlefield when the government suspects you’re gaming the system. Say you claim Florida, but Connecticut looks at your large estate and figures it can collect a meaningful tax. The state isn’t going to take your word for it. It will haul the estate into court and make it prove the decedent was really a Floridian.

That’s exactly what happened in the case the Supreme Court just decided. A wealthy man died with homes in Connecticut, Arizona, and Florida. He’d filed a Florida domicile declaration, held a Florida license, registered to vote in Florida, and kept a Florida bank account—but he actually spent more of his year in Connecticut than anywhere else. The state declared him a Connecticut resident and hit his estate with a roughly $13.2 million tax bill. The estate said: no, he lived in Florida. And the courts had to sort it out.

Where Connecticut just helped the snowbirds

Here’s the win. When domicile is contested, the court has to decide how hard the estate has to work to prove its case. That’s a question of the standard of proof—and the Connecticut Supreme Court just set it at the most forgiving level available: preponderance of the evidence.

If you’re not steeped in this stuff, here’s the quick version. The law uses three main burdens of proof, from easiest to hardest:

1. Preponderance of the evidence — the lowest bar. You only have to show your version is more likely than not—essentially tipping the scale past 51%. This is the everyday civil standard.
2. Clear and convincing evidence — a tougher, middle standard. This is the bar for serious matters like terminating a parent’s rights. You have to show your position is highly probable.
3. Beyond a reasonable doubt — the highest, reserved for criminal convictions.

These standards aren’t airtight scientific instruments, but the practical difference is enormous. Under a preponderance standard, your case is held to much less scrutiny than under clear-and-convincing. It is dramatically easier to win when you only need to nudge past 50% than when you need to show something is “highly probable.”

For years, Connecticut trial courts had been borrowing the tougher clear-and-convincing standard from an old sales-tax case and applying it to estate-tax domicile fights. The Supreme Court said that was wrong. Because the estate tax statute is silent on which standard to use, the default—preponderance—governs. The Court’s reasoning was sensible: figuring out where someone considered “home” is a question about a person’s intent, not the kind of hard accounting data where the tax department deserves extra deference. So it doesn’t justify a heightened burden.

The practical upshot: an estate trying to prove the decedent was a Floridian now has a meaningfully lighter lift. In the case itself, the trial judge had called the evidence essentially a tie. Under the old standard, a tie means the estate loses. Under the new standard, a tie is winnable. That’s the whole ballgame.

What this means for you

A lower burden of proof is good news, but it doesn’t change the underlying game—it just makes a well-built case easier to win. Connecticut still presumes you were a resident here, and your estate still has to overcome that. The shift makes the hill shorter; it doesn’t remove it.

What still matters—and now matters more, because a clean record can actually carry the day—is the everyday conduct that backs up your claimed home while you’re alive:

• Watch the calendar. Time spent is one of the most heavily weighted factors. The man in this case undercut his own Florida story by spending most of the year in Connecticut.
• Make your paperwork consistent. License, voter registration, vehicle registrations, declaration of domicile—get them all pointing at the same state.
• Move the substance, not just the forms. Where’s your primary doctor? Your closest friends? Your house of worship? The possessions you actually care about? Align the real-life details with the legal claim.
• Don’t let it look like a pure tax dodge. Courts discount paperwork that has no real life behind it. Substance beats a signature.

If you split your year between New England and Florida and your estate is anywhere near these thresholds—$15 million in Connecticut, or a much more reachable $2 million in Massachusetts—this is the moment to make sure your records, your habits, and your estate plan all tell the same story about where home really is. The cleaner that story is while you’re living, the easier you make it on the people you leave behind.

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