Updated September 4, 2026. Quick answer: Massachusetts taxes estates above a $2,000,000 threshold: the tax is computed on the entire taxable estate at graduated rates of 0.8% to 16%, then reduced by a credit of up to $99,600, so an estate valued at exactly $2,000,000 owes nothing. For deaths on or after January 1, 2023 this replaced the old rule where crossing $1,000,000 by even a dollar taxed the whole estate from dollar one. A $3,000,000 estate owes $82,400, not tax on the full $3,000,000.
2026 exemption: $2,000,000 (via a $99,600 credit; not indexed, no change for 2026) · Top rate: 16% (graduated 0.8% to 16%) · Key statute: M.G.L. c. 65C, sec. 2A, subsections (f) and (g), added by St. 2023, c. 50, sec. 48
How the $99,600 credit actually ended the cliff
A credit is allowed against the tax equal to the amount of the tax, not to exceed $99,600, and estates of decedents dying on or after January 1, 2023 are not required to pay any tax if the value of the federal taxable estate is not more than $2,000,000. Massachusetts still computes tax on the decedent’s whole taxable estate using the graduated schedule, then subtracts a flat credit capped at $99,600; because $99,600 is precisely the tax on a $2,000,000 taxable estate, tax rises smoothly above $2,000,000 with no jump.
Filing deadline: nine months, with a conditional six-month extension
The Massachusetts estate tax return, with all required documents and payment, must be filed within nine months after the date of the decedent’s death, the same period as the federal deadline. An extension of time to file is void if the total amount paid before the due date is less than 80% of the tax finally determined to be due, unless the estate was separately granted an extension of time to pay.
No portability of a deceased spouse’s unused exemption
The statute defines the $99,600 credit and $2,000,000 threshold entirely in terms of a single decedent’s own estate, with no language allowing a surviving spouse to claim any unused portion of a predeceased spouse’s threshold or credit, unlike the federal DSUE election. Each spouse’s $2,000,000 threshold must be used through that spouse’s own estate, commonly via a credit-shelter or bypass trust, or it is permanently lost.
The credit ended the cliff, but $2,000,000 is still a low threshold.
A $3,000,000 estate owes $82,400 rather than tax on the full amount, and an estate at exactly $2,000,000 owes nothing. At a threshold this low a house and a retirement account can reach it between them, without anyone involved having thought of the estate as large.
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Nonresident decedents: Massachusetts taxes only Massachusetts-situs property, apportioned
For nonresident decedents, tax applies only to the transfer of real and tangible personal property having an actual situs in Massachusetts, and the amount owed bears the same ratio to what a resident would owe as the value of Massachusetts-situs property bears to the decedent's total federal gross estate. The state's own return computes this to six decimal places and specifies that the value of Massachusetts property should not be reduced by the amount of any mortgage or lien when computing the numerator.
The math on a $3,000,000 estate
Tax owed: $82,400. Adjusted taxable estate equals $3,000,000 minus $60,000 equals $2,940,000. That falls in the bracket over $2,540,000 but not over $3,040,000, taxed at $146,800 plus 8.8% of the excess over $2,540,000. Excess equals $400,000; 8.8% of $400,000 equals $35,200. Pre-credit tax equals $146,800 plus $35,200 equals $182,000. Subtracting the $99,600 credit, since $182,000 exceeds it, leaves $182,000 minus $99,600 equals $82,400 owed. Cross-check: an estate of exactly $2,000,000 computes to $99,600 of pre-credit tax, which the credit exactly zeroes out, confirming why that specific credit amount was chosen.
Honest gaps
mass.gov/dor, the specified primary source, was unreachable on every direct attempt this session, so quotes above come from Department of Revenue-authored Form M-706 return and instructions text reproduced on third-party form-hosting mirrors, not fetched live from mass.gov itself. The core exemption, credit, rate-table, and no-portability facts were verified against the actual statutory text of M.G.L. c. 65C sec. 2A at malegislature.gov, which was fetched successfully.
Source note. Read from https://malegislature.gov/Laws/GeneralLaws/PartI/TitleIX/Chapter65C/Section2A; https://formfiles.justia.com/pdf/massachusetts/0703/51.pdf on 2026-09-04.
Related: estate tax by state · who actually pays the estate tax · the lifetime gift and estate tax exemption.
Statutory text read at each state's own department of revenue or legislature. General information, not legal or tax advice; exemptions, rates and filing rules change, and a qualified estate or tax professional should confirm the current figures before you rely on them.