Massachusetts Estate Tax: $2M Exemption Planning

Massachusetts is one of 12 states (plus the District of Columbia) that impose a state-level estate tax. Its $2 million exemption threshold — unchanged since 2003 — is among the lowest in the country. With median home prices in Greater Boston exceeding $800,000 and 401(k) balances, life insurance proceeds, and taxable investment accounts adding up quickly, an increasing number of Massachusetts residents are crossing this threshold without any estate planning in place.

The Massachusetts estate tax is not a minor issue. On a $3.5 million estate, the state tax alone is approximately $182,000. And unlike the federal estate tax, Massachusetts offers no portability between spouses — if one spouse dies without using their $2 million threshold, it is gone. The planning strategies available to Massachusetts residents are well-established, but they require action before death, and the trade-offs are real.

The Massachusetts estate tax structure: how it actually works

Massachusetts computes its estate tax using a graduated rate table based on the old federal state death tax credit under IRC §2011 (repealed in 2005 but preserved by Massachusetts for its own tax calculation). The tax is applied to the entire taxable estate — not just the amount above $2 million. This creates the cliff effect that makes the $2 million threshold so punishing.

The rate structure is graduated, with effective rates roughly as follows:

• $2 million estate: approximately $99,600 (effective rate ~5.0%)
• $3 million estate: approximately $138,800 (effective rate ~4.6%)
• $4 million estate: approximately $218,000 (effective rate ~5.5%)
• $5 million estate: approximately $308,000 (effective rate ~6.2%)
• $10 million estate: approximately $940,800 (effective rate ~9.4%)
• Estates above $10.04 million: top marginal rate of 16%

The cliff effect at $2 million is the most critical planning point. An estate of $1,999,999 owes $0. An estate of $2,000,001 owes approximately $99,600. This is not a marginal rate — it is an all-or-nothing threshold. For estates within $200,000 to $300,000 of the $2 million line, the planning imperative is to get below $2 million by any available means.

No portability: why this matters for married couples

The federal estate tax system allows portability of the deceased spouse's unused exemption (DSUE) under IRC §2010(c)(4). If one spouse dies with a $5 million estate and a $13.61 million exemption, the surviving spouse can claim the unused $8.61 million, effectively giving them a $22.22 million exemption. This was enacted by the American Taxpayer Relief Act of 2012 and is one of the most powerful federal estate planning provisions available.

Massachusetts does not recognize portability. Each spouse gets a $2 million threshold, and if the first spouse to die leaves everything to the surviving spouse via the unlimited marital deduction, the first spouse's $2 million threshold is wasted. The surviving spouse then has a single $2 million threshold for the combined estate.

Example: Robert and Helen, married, live in Newton, Massachusetts. Their combined estate is $4 million — $2 million each. Robert dies first and leaves everything to Helen via his will. Robert's estate owes $0 in Massachusetts estate tax (unlimited marital deduction). Helen now owns $4 million. When Helen dies, her estate owes approximately $218,000 in Massachusetts estate tax. If Robert had instead funded a credit shelter trust with $2 million at his death, both spouses' $2 million thresholds would have been used, and the total Massachusetts estate tax would be $0.

A worked example: $3.5 million Massachusetts estate

Margaret, age 78, is a widow living in Wellesley, Massachusetts. Her estate consists of:

• Primary residence: $1,200,000 (purchased for $350,000 in 1995)
• Taxable brokerage account: $800,000 (cost basis $300,000)
• Traditional IRA: $900,000
• Life insurance death benefit: $400,000 (policy owned by Margaret)
• Bank accounts and personal property: $200,000
• Total gross estate: $3,500,000

Massachusetts estate tax

Margaret's $3.5 million estate exceeds the $2 million threshold. Using the Massachusetts estate tax table, her estate owes approximately $182,000 in state estate tax. This is due 9 months after death (same filing deadline as the federal estate tax return, Form 706, though Massachusetts uses its own Form M-706).

Federal estate tax

If Margaret dies in 2025 with the current $13.61 million federal exemption, her $3.5 million estate owes $0 in federal estate tax. If she dies in 2026 after the TCJA sunset and the exemption drops to approximately $7 million, she still owes $0 in federal estate tax — her estate is well below either threshold. The Massachusetts estate tax paid ($182,000) would be deductible on the federal return under IRC §2053 if federal tax were owed, but in this case there is no federal tax to offset.

Step-up in basis: the silver lining

Under IRC §1014(a), Margaret's heirs receive a full step-up in basis on her capital assets. The house basis resets from $350,000 to $1,200,000. The brokerage account basis resets from $300,000 to $800,000. If her children sell these assets immediately after inheriting them, they owe $0 in capital gains tax — the $1,350,000 in combined unrealized gains ($850,000 on the house + $500,000 on the brokerage) is eliminated.

At a combined 23.8% federal rate (20% long-term capital gains + 3.8% NIIT) plus Massachusetts's 5% state capital gains rate on long-term gains, the step-up saves approximately $388,800 in income taxes ($1,350,000 × 28.8%). The $182,000 Massachusetts estate tax is painful, but the $388,800 in capital gains tax savings from the step-up more than offsets it.

The IRA: no step-up, ordinary income to heirs

Margaret's $900,000 traditional IRA does not receive a step-up in basis. Under the SECURE Act's 10-year rule (IRC §401(a)(9)(H)), her non-spouse beneficiaries must distribute the entire IRA within 10 years of her death. Distributions are taxed as ordinary income under IRC §691. If her children are in the 32% federal bracket and the 5% Massachusetts bracket, the $900,000 IRA generates approximately $333,000 in combined income taxes over the 10-year distribution period.

The IRA is included in Margaret's gross estate for Massachusetts estate tax purposes, contributing to the $3.5 million total. But when her children distribute it, they cannot deduct the Massachusetts estate tax attributable to the IRA. The IRA is effectively double-taxed: once by the Massachusetts estate tax (as part of the gross estate) and again by income tax (as IRD to the beneficiaries). IRC §691(c) allows a federal income tax deduction for federal estate tax attributable to IRD — but Massachusetts estate tax does not qualify for this deduction.

Planning strategies for Massachusetts residents

Strategy 1: Credit shelter trust (bypass trust)

For married couples, the credit shelter trust is the foundational Massachusetts estate tax planning tool. At the first spouse's death, up to $2 million is directed into an irrevocable trust for the benefit of the surviving spouse. The trust assets are not included in the surviving spouse's estate because they are held in trust, not owned outright. The surviving spouse can receive income from the trust and even principal distributions under an ascertainable standard (health, education, maintenance, support — the HEMS standard under IRC §2041(b)(1)(A)).

Result: both spouses' $2 million thresholds are used, sheltering up to $4 million from Massachusetts estate tax. For a couple with $4 million in combined assets, this eliminates the Massachusetts estate tax entirely. Without the trust, the surviving spouse's estate would owe approximately $218,000.

Trade-off: the trust is irrevocable after the first spouse's death. The surviving spouse loses direct control over the trust assets. The trust requires its own tax return (Form 1041) and may distribute income at compressed trust tax rates (37% on income above $15,200 in 2025) unless it distributes income to the surviving spouse.

Strategy 2: Irrevocable life insurance trust (ILIT)

Life insurance proceeds are included in the decedent's gross estate under IRC §2042 if the decedent owned the policy or had incidents of ownership. Margaret's $400,000 life insurance policy is inflating her gross estate from $3.1 million to $3.5 million, adding approximately $47,000 in Massachusetts estate tax.

By transferring the policy to an irrevocable life insurance trust (ILIT), the proceeds are removed from the gross estate. The ILIT must be established at least 3 years before death (the 3-year lookback rule under IRC §2035). Annual premium payments to the ILIT are structured as gifts qualifying for the annual gift tax exclusion ($18,000 per beneficiary in 2025) using Crummey withdrawal powers.

For Margaret, moving the $400,000 policy to an ILIT reduces her gross estate to $3.1 million and her Massachusetts estate tax from approximately $182,000 to $153,000 — a savings of roughly $29,000. For estates near the $2 million threshold, an ILIT can be the difference between owing estate tax and owing nothing.

Strategy 3: Lifetime gifting

Massachusetts does not impose a gift tax. The federal gift tax (IRC §2501) applies, but annual exclusion gifts ($18,000 per recipient in 2025) are completely free of gift tax and reduce the gross estate dollar-for-dollar. A couple with three children and six grandchildren can give away $324,000 per year ($18,000 × 9 recipients × 2 spouses) without touching their lifetime gift tax exemption.

For estates near the $2 million cliff, annual gifting over 5-10 years can move the estate below the threshold. Margaret, with a $3.5 million estate, could reduce her estate by $162,000 per year (assuming 9 recipients at $18,000 each). In 5 years, that is $810,000 removed from the estate — bringing it down to $2.69 million and reducing the Massachusetts estate tax from $182,000 to approximately $106,000.

Critical caveat: gifts of appreciated assets carry over the donor's cost basis under IRC §1015 — the recipient does not get a step-up. If Margaret gifts $100,000 of stock with a $20,000 basis, her child inherits the $20,000 basis and will owe capital gains tax on the $80,000 gain when they sell. If Margaret had held the stock until death, the child would have received a stepped-up basis of $100,000. The trade-off between estate tax savings and lost step-up must be calculated for each asset.

Strategy 4: Roth conversions

Converting traditional IRA assets to Roth IRA assets does not reduce the gross estate for estate tax purposes — the Roth IRA is still included in the estate at the same value. However, the income tax paid on the conversion does reduce the estate (the tax payment leaves the estate and is not a gift). More importantly, Roth conversions shift the character of the inherited retirement account from ordinary-income taxable (traditional IRA) to tax-free (Roth IRA under IRC §408A(d)(1)).

For Margaret, converting $200,000 of her traditional IRA to a Roth costs her approximately $74,000 in income taxes (37% federal + 5% Massachusetts, assuming she is in the top bracket). Her gross estate is reduced by the $74,000 tax payment (from $3.5 million to $3.426 million), saving roughly $5,000 in Massachusetts estate tax. But the real benefit is to her heirs: the $200,000 in the Roth IRA distributes tax-free over 10 years, saving her children approximately $74,000 in income taxes they would have owed on the traditional IRA distributions.

Strategy 5: Qualified personal residence trust (QPRT)

For Massachusetts residents whose home represents a large share of their estate, a qualified personal residence trust under IRC §2702 can freeze the value of the home for estate tax purposes. Margaret transfers her $1.2 million home to a QPRT, retaining the right to live in it for a specified term (e.g., 10 years). If she survives the term, the home is removed from her estate at its value on the date of transfer, not the date of death. If the home appreciates to $1.5 million over 10 years, $1.5 million is excluded from her estate.

Risk: if Margaret dies during the QPRT term, the home is pulled back into her estate at full date-of-death value under IRC §2036. The strategy works only if the grantor outlives the trust term. For a 78-year-old, the actuarial risk makes a QPRT less attractive than for someone in their 60s.

SECURE Act 2.0 and Massachusetts estate planning

SECURE 2.0 reinforced the 10-year distribution rule for inherited retirement accounts and introduced provisions that interact with Massachusetts estate tax planning:

• Required minimum distributions for non-spouse beneficiaries: The IRS finalized regulations in 2024 confirming that non-spouse beneficiaries of account owners who died after their required beginning date must take annual RMDs within the 10-year window. This accelerates the income recognition for heirs of Massachusetts residents who die with large traditional IRAs.
• Roth 401(k) RMDs eliminated: Starting in 2024, Roth 401(k) participants no longer face lifetime RMDs. For Massachusetts residents, this means more Roth assets remain intact at death — reducing future income tax burden for heirs even though the estate tax calculation is unchanged.
• 529-to-Roth rollovers: Unused 529 plan funds can be rolled into a Roth IRA (subject to limits). While the amounts are modest, this creates another path to shift assets from taxable inheritance to tax-free Roth distributions.

The strategic implication for Massachusetts residents: the combination of a low estate tax threshold and the 10-year rule on inherited retirement accounts creates a double hit. Traditional IRAs are included in the gross estate (contributing to the estate tax), and then taxed again as ordinary income to heirs. Roth conversions during life reduce the income tax hit for heirs. Lifetime gifting of non-retirement assets reduces the estate tax hit. The optimal strategy usually involves both — converting some traditional IRA to Roth while simultaneously gifting appreciated assets (accepting the lost step-up trade-off when the estate tax savings exceeds the capital gains cost).

The federal estate tax sunset and Massachusetts

If the TCJA sunsets after 2025 and the federal exemption drops to approximately $7 million per person, more Massachusetts estates will face both state and federal estate tax. A Massachusetts resident with a $10 million estate would owe approximately $940,800 in Massachusetts estate tax and approximately $1,200,000 in federal estate tax (after the $7 million exemption, at a 40% marginal rate, minus the Massachusetts tax deduction under IRC §2053). The combined estate tax burden on a $10 million estate could exceed $2 million.

For estates in this range, the credit shelter trust becomes even more important — it shelters assets from both state and federal estate tax. Portability handles the federal side, but because Massachusetts does not recognize portability, the credit shelter trust is the only way to use both spouses' $2 million Massachusetts thresholds.

Key takeaways

• Massachusetts imposes an estate tax on estates exceeding $2 million. The tax applies to the entire estate from dollar one, not just the excess — creating a cliff where an estate of $2,000,001 owes approximately $99,600.
• Massachusetts does not recognize estate tax portability. Married couples must use a credit shelter trust to preserve both spouses' $2 million thresholds — without one, the first spouse's threshold is wasted.
• The federal step-up in basis under IRC §1014(a) applies to all assets in the gross estate regardless of whether federal estate tax is owed. Heirs receive a new cost basis at fair market value, eliminating unrealized capital gains. This does not apply to retirement accounts.
• Traditional IRAs are double-taxed in Massachusetts estates: included in the gross estate for estate tax purposes and taxed as ordinary income to heirs under the SECURE Act 10-year rule. Roth conversions mitigate the income tax side of this problem.
• For estates near the $2 million cliff, prioritize ILITs (to remove life insurance proceeds), annual gifting ($18,000 per recipient in 2025), and QPRTs (for homeowners with long time horizons). The goal is to get below $2 million, where the tax drops to $0.
• If the TCJA sunsets after 2025, more Massachusetts estates will face both state and federal estate tax. The credit shelter trust is the only tool that addresses both simultaneously.
• Every gifting decision involves a trade-off: estate tax savings vs. lost step-up in basis. Run the numbers for each asset before gifting appreciated property.