What Is the Estate Tax Rate in Massachusetts?

The Massachusetts estate tax rate runs on a graduated schedule from 0.8% up to 16%, applied to estates worth more than $2 million. A fixed $99,600 credit cancels the tax entirely at $2 million, but once an estate crosses that line, the credit stays flat while the tentative tax keeps climbing, so liability appears abruptly and grows quickly.

The $2 Million Threshold and the Cliff

A Massachusetts estate tax return is required when the gross estate plus adjusted taxable gifts exceeds $2 million. The threshold took effect on January 1, 2023, when the state enacted the $99,600 credit that effectively eliminates the tax at or below $2 million.1Mass.gov. FAQs: New Estate Tax Changes Before that date, the filing threshold was $1 million.

The $99,600 credit equals the full tentative tax on a $2 million taxable estate, which is why an estate at that size owes nothing.2General Court of Massachusetts. Massachusetts General Laws Chapter 65C Section 2A The credit does not grow with the estate. For an estate worth $2.5 million, the tentative tax jumps to $138,800, leaving $39,200 due after the credit. This pattern is often called the cliff effect: zero tax at $2 million, then meaningful tax from small increases above it. The cliff is sharpest between $2 million and roughly $3 million. Above that range, the tax still rises, but more smoothly.

The Full Rate Schedule

Massachusetts calculates its estate tax from a rate table originally designed for the now-repealed federal credit for state death taxes. The executor subtracts $60,000 from the taxable estate to get the adjusted taxable estate, then applies the following brackets:

  • $0 – $40,000: 0%
  • $40,000 – $90,000: 0.8%
  • $90,000 – $140,000: 1.6%
  • $140,000 – $240,000: 2.4%
  • $240,000 – $440,000: 3.2%
  • $440,000 – $640,000: 4.0%
  • $640,000 – $840,000: 4.8%
  • $840,000 – $1,040,000: 5.6%
  • $1,040,000 – $1,540,000: 6.4%
  • $1,540,000 – $2,040,000: 7.2%
  • $2,040,000 – $2,540,000: 8.0%
  • $2,540,000 – $3,040,000: 8.8%
  • $3,040,000 – $3,540,000: 9.6%
  • $3,540,000 – $4,040,000: 10.4%
  • $4,040,000 – $5,040,000: 11.2%
  • $5,040,000 – $6,040,000: 12.0%
  • $6,040,000 – $7,040,000: 12.8%
  • $7,040,000 – $8,040,000: 13.6%
  • $8,040,000 – $9,040,000: 14.4%
  • $9,040,000 – $10,040,000: 15.2%
  • Over $10,040,000: 16.0%

The brackets are cumulative. Each layer of the estate is taxed at its own rate, and the 16% top marginal rate applies only to the portion of the adjusted taxable estate above $10,040,000.3Mass.gov. Massachusetts Estate Tax Guide Once the tentative tax is computed from the table, the $99,600 credit is subtracted to arrive at the tax owed.

What the Tax Actually Costs at Common Estate Sizes

Rate tables are easier to read as dollar figures. These examples follow the method published by the Massachusetts Department of Revenue:

  • A $2 million taxable estate produces a $99,600 tentative tax. The credit wipes it out. Tax owed: $0.
  • A $2.5 million taxable estate has an adjusted taxable estate of $2,440,000 and a tentative tax of $138,800. After the credit, $39,200 is due, an effective rate of about 1.6%.3Mass.gov. Massachusetts Estate Tax Guide
  • A $5 million taxable estate has an adjusted taxable estate of $4,940,000 and a tentative tax of $391,600. After the credit, $292,000 is due, an effective rate of about 5.8%.

The effective rate climbs steadily as the estate grows, but it never reaches the 16% top marginal rate because the lower brackets absorb the first several million dollars at lower rates.

Why a Massachusetts Estate Can Owe Tax When the Federal Return Shows Zero

The gap between the state and federal systems is large. For 2026, the federal basic exclusion is $15 million per person, with a top rate of 40%.4Internal Revenue Service. What’s New — Estate and Gift Tax Massachusetts starts taxing at $2 million with a top rate of 16%. A $10 million Massachusetts estate owes nothing to the IRS and a substantial amount to the state.

Massachusetts also computes its tax using the Internal Revenue Code as it existed on December 31, 2000, not the current federal code.5Mass.gov. TIR 02-18: Tax Changes Contained in An Act Enhancing State Revenues and Related Acts Future federal changes do not flow through automatically. In practice, executors preparing Form M-706 use a July 1999 revision of federal Form 706 as the computational backbone.

What Goes Into the Taxable Estate

The number that drives the whole calculation starts with the gross estate: the fair market value of everything the decedent owned or had an interest in at death. That includes real estate, bank and investment accounts, business interests, and personal property. Assets that pass outside of probate still count. Life insurance proceeds where the decedent held ownership rights, IRAs, 401(k)s, and payable-on-death accounts all get swept into the gross estate regardless of who the beneficiary is.

Deductions then reduce the gross estate to the taxable estate. Property passing to a surviving spouse who is a U.S. citizen qualifies for an unlimited marital deduction and is fully excluded.6Mass.gov. Directive 95-1: The Massachusetts Unlimited Marital Deduction Bequests to qualified charities are deductible with no cap. Funeral costs, administration fees, and debts owed by the decedent at death also reduce the taxable estate.

Massachusetts does not have its own gift tax, but lifetime gifts still matter. Gifts made after 1976 that exceeded the annual federal gift tax exclusion ($19,000 per recipient in 2026) are added back when testing whether the $2 million filing threshold is met.3Mass.gov. Massachusetts Estate Tax Guide This prevents someone from giving away assets late in life to slip under the threshold.

Married Couples and the Portability Gap

At the federal level, a surviving spouse can inherit the deceased spouse’s unused exemption, effectively doubling a couple’s combined exclusion to $30 million. Massachusetts offers no equivalent. When the first spouse dies, any unused portion of that spouse’s $2 million threshold is gone.

A married couple that leaves everything to the survivor shelters nothing at the first death because of the unlimited marital deduction, but inflates the survivor’s estate. If the combined estate then exceeds $2 million at the second death, the first spouse’s exemption was wasted. The usual workaround is to direct up to $2 million into a credit shelter trust at the first death, using that spouse’s Massachusetts exemption so the amount is not included in the survivor’s taxable estate later. A Massachusetts-only QTIP election is also available and can be made independent of any federal QTIP election.7Mass.gov. TIR 86-4: MGL c. 65C Massachusetts Estate Tax The election must be made on the Massachusetts return by the filing deadline and cannot be revoked.

If You Live Out of State but Own Property in Massachusetts

Massachusetts also taxes non-residents who die owning real estate or tangible personal property physically located in the state, if their total worldwide estate exceeds $2 million.3Mass.gov. Massachusetts Estate Tax Guide The filing test looks at the entire estate, not just the Massachusetts property. A Florida resident who dies with a $5 million estate that includes a $300,000 vacation home on Cape Cod would need to file Form M-706.

The tax is prorated. Massachusetts first computes the tax as if the decedent were a resident, then multiplies by the ratio of Massachusetts-situs property to the total gross estate.8Justia Law. Massachusetts Code Chapter 65C Section 4 – Nonresident Decedents; Tax on Certain Property Located in Commonwealth Tangible personal property with a Massachusetts situs generally means physical items located in the state, such as vehicles, art, or furnishings in a Massachusetts home. Intangible assets like out-of-state stocks or bank accounts are not included.

Deadlines, Extensions, and the Cost of Missing Them

The return and any tax payment are due within nine months of the date of death.9Commonwealth of Massachusetts Department of Revenue. Instructions for Massachusetts Estate Tax Return Form M-706 An automatic six-month extension to file is available if the estate pays at least 80% of the tax ultimately determined to be due within the original nine-month window, requested on Form M-4768 before the original due date.10Mass.gov. Request an Extension to File and Pay Your Massachusetts Estate Tax A separate extension of time to pay is granted only for undue hardship and can run up to three years from the original due date. Interest on any unpaid tax accrues from the original nine-month deadline whether or not an extension is in place.

Late filing and late payment carry separate penalties, and they stack:

Interest runs from the original due date at the federal short-term rate plus four percentage points, compounded daily. For the first quarter of 2026, the underpayment rate is 8%.12Mass.gov. TIR 25-8: Interest Rate on Overpayments and Underpayments At that rate, an unpaid $50,000 balance accumulates roughly $4,000 in interest in a single year before penalties are added.