Massachusetts Estate Tax for Married Couples and the $2M Cliff

What Is the Massachusetts Estate Tax Threshold for 2026?

Massachusetts taxes estates valued above $2 million per individual in 2026, at graduated rates from 0.8% to 16%, entirely separate from the $15 million federal estate tax exemption. The state's threshold has nothing to do with what happens in Washington, D.C.

The $2 million exemption took effect on January 1, 2023, when Governor Healey signed a $1 billion tax relief package that doubled the old $1 million threshold and introduced a $99,600 credit. Before that date, Massachusetts had one of the most punishing estate tax structures in the country.

Massachusetts is one of only 12 states plus the District of Columbia that still imposes a separate state-level estate tax. More importantly for couples doing long-term planning, the state's estate tax calculation is frozen to the Internal Revenue Code as it existed on December 31, 2000. That means the One Big Beautiful Bill Act signed on July 4, 2025, which made the federal exemption permanent at roughly $15 million per person, has zero effect on what your estate owes Massachusetts.

The practical takeaway: a married couple with a combined estate of $4 million will owe nothing to the IRS but could face a meaningful state tax bill. If your family's net worth sits anywhere near the $2 million line per person, state-level planning matters.

How Does the $2 Million Cliff Work Now That the Credit Replaced It?

The old dollar-one cliff is gone. A $99,600 credit now shields the first $2 million, and only the amount above $2 million is subject to Massachusetts estate tax.

Before 2023, the cliff was brutal. An estate valued at $999,999 owed nothing. An estate at $1,000,001 owed tax computed on the entire value from the first dollar, with no offsetting credit. That meant a $2 difference in estate value could trigger tens of thousands in tax. The 2023 reform addressed this by both raising the threshold and adding the flat credit.

Here's how the credit works mechanically: the state calculates a preliminary tax using graduated rate brackets on your adjusted taxable estate (the federal taxable estate minus $60,000). Then it subtracts the $99,600 credit. If your estate is at or below $2 million, the credit wipes the tax to zero. If you're just above $2 million, the credit substantially reduces the bill.

Worked Example: A $3 Million Estate in 2026

Suppose a Massachusetts resident dies in 2026 with a federal taxable estate of $3 million. The adjusted taxable estate is $2,940,000 ($3,000,000 minus $60,000). Using the state's rate table, that falls in a bracket with a base tax of $146,800 and a marginal rate of 8.8% on the excess over $2,540,000. The excess is $400,000, and 8.8% of that is $35,200. The preliminary tax comes to $182,000. After subtracting the $99,600 credit, the estate owes $82,400.

The math is not intuitive. Rates look modest at the lower brackets (0.8% on the first $40,000 of adjusted taxable estate), but they compound quickly. Professional calculation by an estate attorney or CPA is well worth the investment.

Simplified Massachusetts Estate Tax Rate Brackets (2026)

After calculating the gross tax from these brackets, subtract the $99,600 credit to determine the net tax owed.

What Counts Toward Your Gross Estate in Massachusetts?

The gross estate includes nearly everything you own at death, valued at fair market value: real estate, retirement accounts, life insurance you control, business interests, and personal property.

Here are the major asset categories the Massachusetts Department of Revenue considers:

• Real estate: Your primary home, vacation properties, rental properties, and commercial buildings. As of the September 2024 amendment (St. 2024, c. 206), real estate and tangible personal property located outside Massachusetts is excluded from the state calculation for residents.
• Financial accounts: Bank accounts, brokerage accounts, stocks, bonds, mutual funds, and CDs.
• Retirement accounts: IRAs, 401(k) plans, pensions, and annuities. These count regardless of named beneficiaries.
• Life insurance: Proceeds from policies where the deceased owned the policy or held incidents of ownership (like the right to change beneficiaries or borrow against cash value).
• Business interests: Ownership stakes in closely held businesses, partnerships, and LLCs.
• Personal property: Vehicles, jewelry, art, collectibles, and household items.

Every asset must be appraised at fair market value, and professional appraisals are commonly needed for real estate, business interests, and unique personal property.

Many couples are surprised by how quickly they cross $2 million. A home worth $800,000, combined retirement accounts of $900,000, a $500,000 life insurance policy, and $200,000 in savings and personal property adds up to $2.4 million. That's a taxable estate, even though it might not feel like "wealth."

Key Deductions That Reduce Your Taxable Estate

• Debts and mortgages owed at death
• Funeral and administrative costs (legal fees, accounting, executor compensation)
• Charitable bequests to qualifying organizations (fully deductible)
• Marital deduction for property passing to a surviving spouse outright or through a qualifying trust

The marital deduction is especially important for couples. Property passing to a surviving spouse can be fully deducted, which eliminates the tax at the first death. But it creates a different problem, which we'll cover next.

Does Massachusetts Have Estate Tax Portability for Married Couples?

No. Massachusetts does not offer portability. A surviving spouse cannot inherit the unused $2 million exemption of the first spouse to pass away. This is the single biggest planning gap for married couples in the Commonwealth.

Under federal law, portability allows a surviving spouse to add the deceased spouse's unused exemption to their own. In 2026, that means a married couple can effectively combine exemptions for up to roughly $30 million in federal coverage. Massachusetts offers nothing equivalent.

Here's why this matters practically. Many couples leave everything to the surviving spouse using the unlimited marital deduction. That eliminates any tax at the first death, which sounds great. But it also means the first spouse's $2 million Massachusetts exemption goes completely unused. When the surviving spouse later dies with the combined estate, only their single $2 million exemption applies. An estate that could have passed $4 million tax-free instead passes only $2 million tax-free.

Massachusetts vs. Federal Estate Tax: Side-by-Side Comparison (2026)

The absence of portability isn't a crisis. It's a planning opportunity. Couples who address it together, ideally with an estate attorney, can capture both exemptions through trust-based strategies and keep up to $4 million out of the taxable estate.

How Can Married Couples Plan for the Massachusetts Estate Tax Together?

Couples commonly use a credit shelter (bypass) trust to capture both spouses' $2 million exemptions, alongside lifetime gifting and marital deduction planning coordinated by professionals. These strategies work best when built as a team.

The Credit Shelter Trust: Using Both Exemptions

A credit shelter trust (also called a bypass trust or family trust) is the most direct solution to the portability gap. Here's how it works:

1. When the first spouse dies, up to $2 million of their assets fund the credit shelter trust instead of passing outright to the surviving spouse.
2. The surviving spouse can still receive income from the trust, and principal distributions if needed, throughout their lifetime.
3. Because the assets are held in trust (not owned outright by the survivor), they're excluded from the surviving spouse's taxable estate at their later death.
4. The surviving spouse also retains their own $2 million exemption for assets they own individually.

The result: up to $4 million passes to heirs free of Massachusetts estate tax, compared to just $2 million without the trust.

Setting up a credit shelter trust requires careful drafting by a qualified estate planning attorney. The trust language must comply with Massachusetts law and coordinate with federal provisions. This is not a DIY project.

Lifetime Gifting

Massachusetts has no state-level gift tax (though gifts made within three years of death can sometimes be pulled back into the estate under certain federal rules). Couples can use the federal annual gift tax exclusion ($19,000 per recipient in 2025) to gradually reduce the size of their estates over time. A married couple giving to two children, for example, can transfer $76,000 per year without touching their lifetime exemptions.

Charitable Planning

Charitable bequests are fully deductible from the Massachusetts taxable estate. Charitable remainder trusts and donor-advised funds can reduce the estate while supporting causes you care about and, in some cases, providing income during your lifetime.

Coordinating the Full Picture

Estate tax planning doesn't happen in a vacuum. It intersects with your prenup (which may address how assets are titled and what happens to pre-marriage property), your tax filing strategy, your retirement account beneficiary designations, and your insurance ownership structure. Getting one piece right while ignoring another can create gaps.

This is exactly the kind of coordination Neptune was built for. Neptune pairs couples with experienced estate planning attorneys (20+ years), CFPs, and CPAs who work together on the full picture. Rather than bouncing between separate professionals who don't communicate, you get a team that shepherds the process from start to finish.

As Michael C. Cotugno, Esq., Managing Partner, Neptune Legal, puts it: "Understanding a partner's relationship with money, their historical experiences of abundance or scarcity, their anxieties tied to financial stability, or their personal definitions of success, allows for a deeper, more empathetic understanding of them as a whole individual."

Estate planning is one of the clearest expressions of that understanding. When you and your partner sit down to build a credit shelter trust or map out a gifting strategy, you're not preparing for a worst case. You're creating alignment around shared goals and making sure the financial structure of your partnership reflects what matters to both of you.

If you're a Massachusetts couple exploring how a prenup fits in with broader estate and tax planning, Neptune's lawyer-led online prenup process can serve as the starting point for a coordinated plan that grows with you.