Updated September 4, 2026. Quick answer: Maine taxes estates above a $7,160,000 exclusion for deaths in 2026, at marginal rates of 8%, 10%, and 12% under 36 M.R.S. sec. 4103. Unlike the federal estate tax, Maine does not allow a surviving spouse to inherit a deceased spouse’s unused exclusion, so each spouse’s exclusion is use it or lose it.
2026 exemption: $7,160,000 · Top rate: 12% · Key statute: 36 M.R.S. sec. 4102(5); 36 M.R.S. sec. 4103; 36 M.R.S. sec. 4119
Filing deadline and extensions for Form 706ME
Maine Revenue Services’ Estate Tax FAQ states the Maine estate tax return must be filed within nine months of the date of death, the same nine-month window as the federal Form 706. Maine grants an automatic extension of time to file equal to any federal extension or six months, whichever is longer, with a maximum total extension period of eight months. An extension of time to file is not an extension of time to pay the tax due.
No portability of a deceased spouse’s unused exclusion
Maine does not adopt the federal DSUE portability rule. For the purposes of computing the Maine exclusion, the federal applicable exclusion amount does not include any deceased spousal unused exclusion amount under the Code, Section 2010. Maine’s exclusion cannot be carried over to a surviving spouse; each spouse gets one exclusion at their own death, and any unused portion simply disappears, which argues for credit-shelter or bypass-trust planning rather than relying on a second exclusion later.
True marginal brackets, with exact dollar thresholds
36 M.R.S. sec. 4103 is a genuine marginal-bracket system, not a cliff: for value up to the exclusion amount plus $3,000,000, the tax is 8% of the excess over the exclusion; for the next tier, the tax is $240,000 plus 10% of the excess over the exclusion plus $3,000,000; above the exclusion plus $6,000,000, the tax is $540,000 plus 12% of the excess over that mark. Applied to the 2026 exclusion of $7,160,000, that puts the 8% bracket at $7,160,000 to $10,160,000, the 10% bracket at $10,160,000 to $13,160,000, and the 12% bracket above $13,160,000.
Each spouse’s $7,160,000 exclusion is use it or lose it.
Maine allows no portability, so an exclusion that goes unused at the first death is gone rather than inherited. Whether a married couple’s plan actually uses both exclusions is settled by the structure of the documents, long before either return is filed.
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Nonresidents owning Maine real estate or tangible property
Nonresidents are not exempt from Maine estate tax if they own Maine-situs assets. Maine imposes tax on the Maine taxable estate of every nonresident, computed as the full resident tax multiplied by the ratio of the value of the decedent's real and tangible personal property located in Maine to the value of the decedent's adjusted federal gross estate. Maine can also disregard a pass-through entity holding that property in cases lacking a genuine business purpose or adequate consideration, to stop entity structuring from defeating the apportionment.
The math on a $8,160,000 estate
Tax owed: $80,000. The 2026 Maine exclusion is $7,160,000. Excess over the exclusion equals $8,160,000 minus $7,160,000, which is $1,000,000. That excess falls entirely inside the first bracket (exclusion up to exclusion plus $3,000,000, i.e. $7,160,000 to $10,160,000), taxed at 8% of the excess over the exclusion. Tax equals 8% times $1,000,000, which is $80,000.
Honest gaps
The administrative Rule 603, Maine Estate Tax After 2012, referenced on the 706ME page was not independently fetched, so procedural detail beyond what the FAQ and statute text state directly, such as the specific extension-request form number, is unverified here.
Source note. Read from https://www.maine.gov/revenue/faq/estate-tax; https://www.mainelegislature.org/legis/statutes/36/title36sec4102.html; https://www.mainelegislature.org/legis/statutes/36/title36sec4103.html; https://www.mainelegislature.org/legis/statutes/36/title36sec4104.html 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.