The Massachusetts estate tax has the lowest exemption threshold in the United States — $2 million in 2026, unchanged from 2023, with no portability between spouses and no inflation adjustment baked into the statute. A retired schoolteacher in Newton with a paid-off colonial and a $400,000 403(b) clears the line easily. So does a longtime Cape resident whose house has appreciated past the cottage it was in 1990.

For most of the past two decades, this was even worse than it sounds. Before October 2023, Massachusetts ran a “cliff” structure: an estate of $1,000,001 paid tax on the entire $1,000,001, not just the dollar over. The marginal rate at the cliff was effectively infinite. The 2023 reform fixed that — the new $2 million threshold is a true exclusion — but the underlying tax remains, and the exemption is still by far the lowest in the country.1 This piece walks through what the 2023 reform actually did, why a married couple with a paid-off house in Wellesley should be paying attention, and the planning moves still available before the next tax year closes.

What “the cliff” used to mean

Until October 2023, MA estate-tax statute applied a brutal binary. An estate at $999,999 owed no Massachusetts estate tax at all. An estate at $1,000,001 owed tax computed on the entire $1,000,001 — roughly $36,500. The marginal rate at the threshold was, mathematically, infinite. The structure had been in place since 2006 and was a perennial target of reform bills that consistently failed in committee.

The political problem was straightforward. The MA estate tax generates approximately $400–$500 million in annual revenue, and the threshold caught a meaningful number of middle-class estates — particularly in the high-cost eastern half of the state. Estate-planning attorneys built entire practices around the cliff. The most common workaround — aggressive lifetime gifting to push the estate under $1 million — was effective but required planning years in advance. Families that found out about the cliff at probate had no good options.

What the 2023 reform actually changed

Chapter 50 of the Acts of 2023, signed by Governor Healey on October 4, 2023, made two structural changes:

1. The threshold doubled to $2 million

Effective for decedents dying on or after January 1, 2023, the filing and tax threshold is $2 million. Estates below $2 million owe no MA estate tax and have no MA estate-tax filing obligation.1

2. The cliff became a true exclusion

More important than the threshold change: the new statute treats $2 million as an exclusion amount, not a binary trigger. An estate of $2,500,000 in 2026 pays tax computed on the $500,000 that exceeds the threshold — not on the full $2,500,000. The graduated rate table from M.G.L. c. 65C § 2A applies to the excess only, producing tax of roughly $35,000–$40,000 on a $500,000 excess rather than the $138,000 the pre-reform cliff structure would have imposed.2

What the reform did not change

Three structural problems with the MA estate tax survived the 2023 reform untouched. For families planning around the $2 million threshold, these are the constraints that shape everything else:

No portability between spouses

Unlike the federal estate tax, Massachusetts does not allow the unused exemption of the first spouse to die to be transferred to the surviving spouse.3 The default outcome — an estate that passes entirely to the surviving spouse under the marital deduction — wastes the first spouse’s $2 million exemption entirely. The surviving spouse then dies with the full combined estate and only their own $2 million exemption to apply.

For a married Massachusetts couple with $4 million in combined assets and a standard “everything-to-spouse” will, the eventual MA estate tax can be $200,000 or more. The same couple with a properly-funded credit-shelter trust at the first death pays zero. The math is so consequential that any married couple with combined assets approaching $2 million should have the credit-shelter conversation with counsel, full stop.

No inflation indexing

The $2 million threshold is statutory and fixed. There is no CPI adjustment, no annual indexing, no automatic step-up. The federal estate-tax exemption ($13.99 million in 2026) is inflation-indexed; the Massachusetts threshold is not. What this means in practice: each year that passes, more families cross the threshold without anything in their financial picture changing.

Out-of-state real estate affects the rate

A wrinkle that consistently surprises snowbirds: the “Massachusetts taxable estate” includes out-of-state real estate for purposes of determining the applicable rate, then the actual tax is apportioned to the MA share.4 A Newton resident with a $1.6 million MA home, a $700,000 Florida condo, and $500,000 in investments has an estate of $2.8 million for rate purposes, with the rate applied to the $1.8 million in MA-sited assets after apportionment. A family that thought they were under the threshold because their MA assets alone were under $2 million can be unpleasantly surprised.

What a MA estate of $2 million actually looks like

Most adult children underestimate how easily their parent’s estate crosses the line. The $2 million threshold is reached by:

The total clears $2 million without any of the markers that typically signal “estate planning matters” — no business interests, no second home, no investment portfolio of unusual size. For a retired teacher, firefighter, nurse, or state employee in a Boston-area suburb, the typical asset mix at death routinely crosses the threshold by $200,000–$600,000.

The planning moves that still work in 2026

For families approaching or over the $2 million line, four strategies do the bulk of the planning work in MA. None is new, but each becomes more or less appropriate depending on the family’s specific circumstances.

1. Credit-shelter trust for married couples

The single highest-leverage move for married MA couples with combined assets between $2 million and $4 million. At the first spouse’s death, $2 million of assets fund a credit-shelter (or “bypass”) trust that uses the deceased spouse’s exemption. The surviving spouse has lifetime access to income and reasonable principal but the trust assets don’t enter their taxable estate at the second death. The structure preserves both $2 million exemptions and saves the family roughly $150,000–$200,000 in MA estate tax at the second death.

2. Lifetime gifting

Massachusetts imposes no state-level gift tax. Lifetime gifts drop out of the MA taxable estate entirely — not subject to a three-year add-back like New York’s, and not subject to a state gift-tax computation like Connecticut’s.5A parent making annual federal-exclusion gifts ($19,000 per donee in 2026) to children and grandchildren can move meaningful assets out of the MA estate over time without any state tax consequence. For larger gifts, the federal lifetime exclusion ($13.99 million) is generally available; the federal gift tax doesn’t typically bind on gifts MA residents are likely to make.

The practical implication: a parent at $2.5 million who gives $50,000 to each of three children annually for three years has moved $450,000 out of the MA estate and saved approximately $30,000–$40,000 in eventual MA estate tax. The federal gift-tax return (Form 709) is required when gifts exceed $19,000/donee/year, but no federal tax is owed.

3. Title planning for out-of-state real estate

If the family owns a vacation home in Florida, Maine, or New Hampshire, the title structure matters. Real estate owned directly by an MA resident is included in the MA-taxable-estate rate calculation. Real estate owned by an out-of-state LLC, transferred to a grantor trust during life, or otherwise restructured may receive different treatment. The Department of Revenue’s position on various restructuring strategies is technical and evolves; counsel familiar with both states’ rules is essential.

4. Irrevocable life insurance trust (ILIT)

For families holding life insurance with a face value that would push the estate over the threshold, an ILIT keeps the insurance proceeds outside the taxable estate entirely. A $1 million life-insurance policy owned personally by the insured is included in the estate at face value; the same policy owned by an ILIT funded with annual gift exclusions is not.

The four decisions to make this year

For families approaching or over the $2 million line, these are the questions worth working through with Massachusetts counsel in 2026:

  1. Get an actual current estate valuation. Most families underestimate their parent’s estate by $200,000–$500,000 because they net out anticipated income tax on retirement accounts (which the MA computation doesn’t allow) or forget that life-insurance face value counts. A real number, not an estimate, is the starting point.
  2. For married couples: is there a credit-shelter structure in the will?If the existing documents say “everything to spouse,” the first exemption is going to be wasted unless the documents are updated or the surviving spouse makes a qualified disclaimer at the first death. Disclaimers work but require preparation; the cleaner move is updating the documents.
  3. For estates already over $2 million: is an annual gifting program in place? The federal annual exclusion is use-it-or-lose-it. A parent at $2.5 million who never gifts during life will eventually pay roughly $40,000 in MA estate tax on the excess; the same parent who gifts $40,000/year ($20K to each of two children) for five years pays nothing.
  4. For snowbirds with out-of-state property: is the title structure intentional?The apportionment rule means out-of-state real estate affects the MA rate even though only MA-sited assets are taxed. A Florida condo titled directly in the MA resident’s name produces a different outcome than the same condo held in an FL-resident family LLC.6

The legislative outlook

Reform pressure on the MA estate tax did not end with the 2023 amendment. Bills introduced in the 2025–26 legislative session have proposed further increases (to $3 million or $5 million) and the introduction of spousal portability. None has cleared committee as of this writing. The 2023 reform softened the worst of the pre-existing structure but did not bring MA into line with either federal practice or with any other state’s exemption level. Connecticut, the next-lowest, sits at $13.99 million in 2026 — matching the federal number.

Families should plan as if the $2 million threshold will remain in place, with no portability and no indexing, for the foreseeable future. The cost of planning is small. The cost of not planning — for a married couple with $4 million in combined assets — is in the $150,000–$200,000 range. A two-hour estate-planning consultation pays for itself many times over.

The bottom line

Massachusetts is the most aggressive estate-tax state in the country measured by exemption level, and the 2023 reform did not change that. What it did change was the worst feature of the prior regime — the cliff — and that change matters for families that were caught between $1 million and $2 million and have now stepped back from the edge. For families above $2 million, the planning toolkit is the same it’s always been: a credit-shelter structure for married couples, lifetime gifting where the cash-flow permits, careful title planning for out-of-state real estate, and an ILIT where life insurance is part of the picture. The expensive mistake is the one most MA families make: assuming the threshold doesn’t apply to them because they don’t feel wealthy. The house, the IRA, and a few good decades of appreciation get there on their own. Plan as though it will, because it probably already does. The probate process is where families discover, too late, that the planning window closed at death. A workingPOA and a current set of documents that reflect the 2023 reform should be the minimum baseline for any MA family in this zone.