Massachusetts Estate
Tax Calculator

Massachusetts imposes a state estate tax with one of the lowest exemptions in the nation at **$2 million**. Like Illinois, Massachusetts uses a cliff structure: once an estate exceeds $2 million, the tax applies to the entire taxable estate, not just the excess above $2 million.

Effective rates range from approximately 0.8% to 16%.

The $2 million threshold has not been adjusted for inflation since it was established, meaning more estates become taxable each year as asset values appreciate. In the Greater Boston area especially, a single-family home plus retirement accounts and life insurance can easily push an estate past $2 million.

This makes Massachusetts estate tax planning relevant for a broader range of families than in most states.

The federal exemption of $15 million is nearly seven times the Massachusetts exemption. This gap means a large number of Massachusetts estates face state estate tax while owing nothing federally.

Massachusetts does not offer portability of its estate tax exemption, compounding the problem for married couples who fail to use both exemptions during the first spouse's lifetime.

The cliff effect magnifies the stakes. An estate of $1,999,999 owes zero Massachusetts estate tax.

An estate of $2,000,001 owes tax on the full amount — roughly $99,600 at the lowest bracket. This discontinuity creates strong incentives for precisely timed lifetime transfers and charitable planning.

Credit shelter trusts are essential for married Massachusetts couples. By funding a bypass trust at the first death up to $2 million, both spouses' exemptions are preserved.

An improperly structured estate plan can waste one entire Massachusetts exemption, resulting in an additional $99,600 to $300,000+ in state estate tax.

Massachusetts also imposes a separate generation-skipping transfer tax. Irrevocable life insurance trusts (ILITs) are heavily used in Massachusetts to exclude life insurance proceeds from the taxable estate, since even a modest policy can push an otherwise non-taxable estate over the $2 million cliff.

Also consider qualified personal residence trusts (QPRTs) given the high real estate values in eastern Massachusetts.

See how the Massachusetts cliff effect impacts your estate. This estimator models the full-estate taxation method used by Massachusetts, so you can compare scenarios on either side of the $2 million threshold.

Free for all states.

Massachusetts residents with taxable estates face a two-layer system: the federal estate tax (exemption of $15 million in 2025, top rate of 40%) and the Massachusetts estate tax (exemption of $2 million). The gap between these exemptions creates a range where only the state tax applies.

An estate valued at $8 million, for example, may owe Massachusetts estate tax while owing nothing at the federal level.

The federal return (Form 706) allows a deduction for state estate taxes paid, which partially offsets the double-taxation effect but does not eliminate it. The state tax is deductible on the federal return as an estate administration expense or under the state death tax credit rules, depending on the estate's circumstances.

The net result is that combined effective rates in Massachusetts can exceed 45% on estates large enough to trigger both layers.

Planning for this interaction requires modeling both taxes simultaneously. Strategies that reduce the Massachusetts taxable estate — such as lifetime gifts, charitable bequests, and irrevocable trusts — may also reduce federal exposure, but the relative benefit depends on where the estate falls within each jurisdiction's rate brackets.

Use our Massachusetts estate tax calculator to model both layers side by side, and check the Massachusetts probate cost calculator to estimate administration expenses.

Federal law permits a surviving spouse to use the deceased spouse's unused exclusion (DSUE) — commonly called portability — by timely filing Form 706 for the first-to-die spouse. This allows married couples to shelter up to $30 million federally without trust-based planning.

However, most estate-tax states, including Massachusetts, do not offer portability of the state exemption.

This asymmetry makes bypass trusts (also called credit shelter trusts or B trusts) essential in Massachusetts. At the first spouse's death, funding a bypass trust up to the Massachusetts exemption amount preserves that exemption for state tax purposes.

Without the trust, the unlimited marital deduction passes everything to the surviving spouse tax-free at the first death — but the surviving spouse's estate then has only one Massachusetts exemption, effectively wasting the first spouse's.

The bypass trust should be sized carefully. Overfunding it beyond the Massachusetts exemption wastes the marital deduction benefit; underfunding it fails to capture the full state exemption.

For married couples with estates above $2 million but below $15 million, the bypass trust is the single most impactful planning tool available. Review your plan with the Massachusetts estate tax estimator, and use the executor fee calculator to account for administration costs in your projections.

The $2 million Massachusetts exemption establishes a lower threshold than the federal exemption, making proactive estate reduction strategies more urgent. Irrevocable trusts are the primary vehicle: irrevocable life insurance trusts (ILITs) remove life insurance proceeds from the taxable estate, spousal lifetime access trusts (SLATs) allow married couples to remove assets while retaining indirect access, and qualified personal residence trusts (QPRTs) transfer a home at a discounted gift tax value.

Annual exclusion gifting — currently $19,000 per recipient (2025) — reduces the taxable estate dollar-for-dollar without consuming the lifetime gift exemption. For Massachusetts residents near the $2 million threshold, a sustained gifting program over several years can bring the estate below the state exemption entirely.

Charitable remainder trusts (CRTs) and charitable lead trusts (CLTs) offer additional reduction while generating income tax deductions.

GRATs (grantor retained annuity trusts) are particularly effective in low-interest-rate environments, transferring asset appreciation to beneficiaries with minimal or zero gift tax cost. For Massachusetts business owners, entity-level planning — family limited partnerships, LLCs with valuation discounts, and buy-sell agreements — can reduce the reportable value of closely held interests for both state and federal purposes.

Compare strategies using the Massachusetts estate tax calculator or find a Massachusetts estate planning attorney.