Short answer: if you are moving to Miami from Massachusetts, what the millionaire tax changed is this: Massachusetts still taxes most income at a flat 5%, but since 2023 the Fair Share Amendment adds a 4% surtax on taxable income above US$1,107,750 (the 2026 threshold) — 9% in total, and 12.5% on short-term capital gains above the line. Florida taxes the same income at US$0. So the saving from moving to Florida from Massachusetts is US$7,500 a year at US$150,000 of taxable income, US$25,000 at US$500,000, and US$90,690 at US$1,500,000. The part almost nobody plans for: the surtax does not need a million-dollar salary — one big year, like selling a business, can push a household that never felt rich over the line exactly once, at the worst possible moment. This is the cost of living Miami ledger I run for Massachusetts clients, line by line.
Updated: October 21, 2026.
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Moving to Miami from Massachusetts: what the millionaire tax actually changed
Before 2023, Massachusetts was a simple flat-tax state: 5% on wages, interest, dividends and long-term capital gains, 8.5% on short-term gains, end of story. Voters changed that in November 2022. The Fair Share Amendment — a constitutional amendment, so the legislature cannot quietly repeal it — adds 4% on the slice of taxable income above an inflation-indexed threshold: US$1,000,000 in 2023, US$1,053,750 in 2024, US$1,083,150 in 2025 and US$1,107,750 in 2026. Only the income above the line pays the extra 4%; the first US$1,107,750 still pays 5%. The Massachusetts Department of Revenue certified US$2.987 billion of surtax revenue for fiscal 2025 alone — well above the roughly US$2 billion a year projected when it was sold to voters — and the money is constitutionally earmarked for education and transportation.
| The line (2026) | Massachusetts | Florida / Miami |
|---|---|---|
| State income tax on US$150,000 of taxable income | US$7,500 a year | US$0 |
| On US$300,000 | US$15,000 a year | US$0 |
| On US$500,000 | US$25,000 a year | US$0 |
| On US$1,500,000 (5% + 4% surtax on US$392,250 above the threshold) | US$90,690 a year | US$0 |
| On US$2,000,000 | US$135,690 a year | US$0 |
| Short-term capital gains rate above the threshold | 12.5% (8.5% + 4%) | 0% |
| One-bedroom median rent — Boston vs. Miami (Zumper, 2026) | US$3,000 | US$2,590 |
| State estate tax | Yes — filing from US$2,000,000, rates 0.8%–16% | None |
Two honest notes on that table. First, my Massachusetts figures are the straight rate arithmetic on taxable income, before the personal exemption (US$4,400 single) — the exemption trims a few hundred dollars, not the story. Second, the rent line is real but small: Boston to Miami saves about US$410 a month on a one-bedroom, roughly US$4,920 a year. Unlike the cost of living in Miami vs New York comparison, where rent does heavy lifting, the Massachusetts case is a tax case first and a rent case second — which is why the next section matters more than any neighborhood list. If your reference point is the bigger northern ledger, compare moving to Miami from New York: new york vs florida taxes reach about US$13,971 a year at just US$150,000, because New York stacks a city tax on top. Massachusetts has no city income tax — its sting is concentrated at the top, and on one-time events.
Cost of living in Miami vs Massachusetts: the one-time year is the expensive one
The scenario I see most: a couple in their fifties sells the business they built over twenty years. In the sale year their taxable income is, say, US$800,000 of salary and other income plus a US$700,000 long-term gain — US$1,500,000 in one year, and never again. Massachusetts taxes that year at US$90,690. The surtax slice alone is US$15,690 — money that exists only because the gain landed while they were still Massachusetts residents. Closed after a genuine change of domicile to Florida, the same sale owes Massachusetts nothing on the gain (a Florida resident’s sale of their own business interests is generally not Massachusetts-source income; a sale of Massachusetts real estate, or income from a business still operating there, is a different and fact-specific question — this is exactly the line to clear with a tax advisor before signing, not after).
Short-term gains are the rush penalty. Massachusetts taxes gains on assets held a year or less at 8.5%, not 5%. Above the surtax threshold that becomes 12.5% — the highest combined rate on this page. Selling an asset at month eleven instead of month thirteen, in a year you are already over the line, is a 7.5-point mistake against the long-term-plus-nothing you would pay as a Florida resident. Timing a sale around a move is not a loophole; it is the whole game, and it only works if the domicile change is real and documented before the event.
Sequence, then, is everything: domicile first (home, license, voter registration, the first-30-days domicile checklist), day-count discipline second, and only then the liquidity event. Reverse the order and you have simply donated the surtax. The proof standard is the same one in the 183-day rule and how to prove Florida domicile — and Massachusetts runs its own version of that test, below.
What most people don’t know
1. The threshold is the same for a married couple as for a single person — a built-in marriage penalty. In 2026 the surtax line is US$1,107,750 whether you file single or married filing jointly. Two unmarried partners earning US$900,000 each pay no surtax; married, their combined US$1,800,000 pays 4% on US$692,250 — US$27,690. Massachusetts practitioners therefore model married-filing-separately for some couples, because each spouse filing separately gets their own threshold (the trade-offs against other provisions are real, so it has to be modeled, not assumed). In Florida the entire question evaporates: there is no state return to file jointly, separately, or at all.
2. Massachusetts has its own 183-day trap, and keeping the house can spring it. You are a Massachusetts resident if you are domiciled there, or if you keep a permanent place of abode in Massachusetts and spend more than 183 days in the state in a year — even with a genuine Florida domicile. Keep the Boston-area house “for summers,” spend June through December there, and Massachusetts taxes your worldwide income for that year, surtax included. And income with a Massachusetts source — days you physically work there, a Massachusetts rental, a business operating there — stays taxable even to a true nonresident. The exit has to be an exit.
3. The estate tax starts at US$2 million — far below the federal line. For 2026 the federal estate exemption is US$15,000,000 per person. Massachusetts requires an estate tax return once the gross estate plus adjusted taxable gifts passes US$2,000,000, with rates from 0.8% to 16% and a US$99,600 credit — and, unlike the federal system, no portability of the exemption between spouses. A Boston-area house, retirement accounts and a life insurance policy reach US$2 million without anyone feeling like an estate-tax family. Florida has no estate tax at any level. For households anywhere near that line, the domicile change is worth more than the income-tax saving — and it only counts if it is done while it can still be documented.
4. You do not need to be a millionaire every year — just once. The surtax is assessed year by year, on that year’s taxable income. A US$450,000 earner who sells a rental property, exercises concentrated stock or converts a large IRA balance in one year can cross US$1,107,750 exactly once and pay five figures of surtax on the crossing. That is why I plan Massachusetts moves backwards from the client’s next big taxable event, not from their salary. One more honest line in the other direction: Social Security is exempt in Massachusetts too — that line, at least, does not change with the move. Households coming from the state next door should also read moving from Connecticut to Miami, where the trap is different — a 30-day rule and a New York job.
Leaving Massachusetts cleanly: the order I use
Before the move: list every taxable event expected in the next 24 months — business sale, property sale, vesting, conversion — and put a date next to each. That list, not the moving truck, sets the calendar. If an event can genuinely close after the domicile change, model both years side by side; the difference at US$1,500,000 of taxable income is US$90,690 against US$0.
The Massachusetts home: sell it, rent it long-term to unrelated tenants, or accept that keeping it available plus more than 183 days in the state keeps you a statutory resident. A house kept “just in case” is the most expensive souvenir in this niche.
The first 30 days in Florida: Florida driver’s license within 30 days of establishing residency, vehicle titled and registered in Florida, voter registration moved, and — if you buy — occupy by January 1 and file homestead by March 1. File the move year on Form 1-NR/PY as a part-year Massachusetts resident, keep withholding aligned with your actual work state from the first Florida paycheck, and keep the day-count records that prove the year. Dated documents are the evidence file if the DOR ever asks.
Frequently asked questions
What exactly did the Massachusetts millionaire tax change?
Since 2023, the Fair Share Amendment adds a 4% surtax on taxable income above an inflation-indexed threshold — US$1,107,750 for 2026 — on top of the flat 5%. Income above the line pays 9%, and short-term capital gains above the line pay 12.5%. It raised US$2.987 billion in fiscal 2025 (Massachusetts DOR), and because it is a constitutional amendment, it cannot be repealed by an ordinary vote of the legislature.
How much do I save moving from Massachusetts to Florida?
On state income tax alone: about US$7,500 a year at US$150,000 of taxable income, US$15,000 at US$300,000, US$25,000 at US$500,000, US$90,690 at US$1,500,000 and US$135,690 at US$2,000,000 — Florida’s figure is US$0 at every level. Add roughly US$4,920 a year if you rent a one-bedroom (Boston median US$3,000 vs. Miami US$2,590, Zumper 2026), and subtract whatever Florida homeowners insurance costs you on the other side if you buy; get that quote on the actual address before you celebrate.
Do I have to earn over a million in salary to pay the surtax?
No. The test is total taxable income in a single year, from all sources combined. One large long-term gain — a business sale, a property sale, a concentrated stock position — stacked on an ordinary salary is the most common way households cross US$1,107,750, and they usually cross it exactly once. That is why the timing of the event relative to a genuine domicile change is worth more than any annual salary saving.
Can Massachusetts still tax me after I move to Miami?
Yes, in defined cases: if you keep a Massachusetts home and spend more than 183 days a year there (statutory residency), and on Massachusetts-source income even as a nonresident — days worked in Massachusetts, Massachusetts rentals, a business still operating there. A clean break — real Florida domicile, day-count discipline, and advice on any Massachusetts assets you keep — is what ends the relationship. This page is information, not tax advice; a move at these income levels should be modeled by a tax professional before the event, not after.
Yara Coker — SETTLE, relocation services in Miami.
Want help with your move to Miami?
Tell me your income range and — more important — your next big taxable event and its likely date, and I will run this same ledger with your real numbers, including the surtax year, the 183-day question and the estate line most comparisons never mention, and tell you honestly whether the tax case carries your move. First call is free and there is no obligation.
Sources: Massachusetts Department of Revenue — Fair Share surtax guidance (4% surtax on taxable income above the inflation-indexed threshold: US$1,000,000 in 2023, US$1,053,750 in 2024, US$1,083,150 in 2025, US$1,107,750 in 2026; same threshold for single and married filing jointly) and fiscal year 2025 revenue release (mass.gov, August 8, 2025: preliminary surtax revenue certified at US$2.987 billion). Massachusetts base rates: 5% on wages and long-term capital gains, 8.5% on short-term capital gains. Massachusetts residency (domicile, or permanent place of abode plus more than 183 days in the state) and part-year filing on Form 1-NR/PY: Massachusetts DOR and TIR 95-7 as summarized in practitioner references consulted October 2026. Massachusetts estate tax: filing required above US$2,000,000 including adjusted taxable gifts, credit US$99,600, rates 0.8%–16%, no portability (Massachusetts DOR estate tax guide). Federal estate exemption US$15,000,000 per person for 2026. Florida Department of Revenue, Tax Information for New Residents (Florida does not impose personal income tax); Florida Constitution, Article VII, Section 5. Zumper national rent report 2026, as reported by USA Today (Boston one-bedroom median US$3,000; Miami one-bedroom US$2,590; Miami two-bedroom US$3,300). New York state and city tax of about US$13,971 at US$150,000: SETTLE arithmetic on New York Tax Department tables, as published in this site’s New York tax-savings guide. All income-tax dollar figures and the one-time-event model are SETTLE arithmetic on the sources above, computed on taxable income before personal exemptions; individual circumstances vary and this page is not tax advice.
Versión en español: Vivir en Miami desde Massachusetts: la venta única que ahora paga 9% — y 12,5% si la apuras
