Maine Estate
Tax Calculator

Maine imposes a state estate tax with an exemption of **$6.80 million**, indexed for inflation. The tax applies graduated rates from 8% to 12% on taxable estates above the exemption.

Unlike some states with a cliff effect, Maine taxes only the amount that exceeds the exemption, making the tax more predictable and proportional.

Maine's relatively generous exemption means the estate tax primarily affects larger estates — roughly those in the top 1-2% of Maine decedents. However, Maine's real estate values in coastal areas (York, Cumberland, and Hancock counties especially) push more estates into taxable territory than the state median would suggest.

The federal exemption of $15 million is approximately double Maine's **$6.80 million** exemption. Estates between these thresholds owe Maine estate tax but no federal estate tax.

Maine does not offer portability of its state exemption, so surviving spouses cannot claim the deceased spouse's unused Maine exemption.

For estates that owe both federal and Maine estate tax, the state tax paid is deductible on the federal estate tax return as a debt of the estate (though not as a credit). Model the interaction to determine optimal distribution between state and federal liability.

Maine does not impose a separate inheritance tax, so the estate tax is the only state-level transfer tax. Maine's income tax treatment of trusts is also relevant — Maine taxes trusts with a Maine resident trustee or Maine-source income, which can affect the overall tax efficiency of irrevocable trust strategies.

For those with seasonal residences in Maine, domicile analysis is critical. Maine will assert taxing jurisdiction over the full estate of anyone it considers a domiciliary.

Document objective indicators of domicile (voter registration, driver's license, time spent) to avoid double-state taxation disputes.

Estimate Maine estate tax liability using this calculator. Input estate value, applicable deductions, and marital status for a side-by-side federal and state projection.

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Maine 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 Maine estate tax (exemption of $6.80 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 Maine 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 Maine can exceed 45% on estates large enough to trigger both layers.

Planning for this interaction requires modeling both taxes simultaneously. Strategies that reduce the Maine 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 Maine estate tax calculator to model both layers side by side, and check the Maine 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 Maine, do not offer portability of the state exemption.

This asymmetry makes bypass trusts (also called credit shelter trusts or B trusts) essential in Maine. At the first spouse's death, funding a bypass trust up to the Maine 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 Maine exemption, effectively wasting the first spouse's.

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

For married couples with estates above $6.80 million but below $15 million, the bypass trust is the single most impactful planning tool available. Review your plan with the Maine estate tax estimator, and use the executor fee calculator to account for administration costs in your projections.

The $6.80 million Maine 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 Maine residents near the $6.80 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 Maine 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 Maine estate tax calculator or find a Maine estate planning attorney.