If you’re handling an estate for someone who lived in Maine, you might need to file a Maine inheritance tax return. Unlike federal estate tax or Maine’s own estate tax, the inheritance tax applies to what certain beneficiaries receive and only if the deceased was a Maine resident at death. It’s not common for most estates, but when it applies, missing the filing deadline or misclassifying a beneficiary can lead to penalties or delays in distributing assets.

Who actually has to file a Maine inheritance tax return?

Maine does not have a general inheritance tax. That’s important: Maine repealed its inheritance tax in 1998. What people often confuse with “Maine inheritance tax” is either the Maine estate tax (which still exists) or the federal estate tax. If you’re looking up “Maine inheritance tax filing requirements,” you’re likely dealing with the Maine estate tax instead especially since Maine’s estate tax applies to estates valued over $6.4 million (2024), and the executor must file Form 706ME even if no tax is due.

What triggers a Maine estate tax filing?

You must file Form 706ME if the decedent was a Maine resident at death and the gross estate exceeds the state’s exemption amount. For 2024, that’s $6.4 million. The value includes real estate, bank accounts, retirement accounts, life insurance proceeds payable to the estate, and jointly held property where the decedent contributed funds. It doesn’t matter whether the estate owes tax the filing itself is required if the threshold is met.

When is the Maine estate tax return due?

The deadline is nine months after the date of death. You can request a six-month extension by filing Form 4768ME before the original due date but interest accrues on any unpaid tax from the original due date, even with an extension. No extensions are available for the filing requirement itself if the estate meets the threshold.

What paperwork do you need to gather?

Start with the decedent’s death certificate and a complete list of assets as of the date of death. You’ll also need appraisals for real estate and business interests, statements for financial accounts, and documentation showing how joint accounts or payable-on-death accounts were held. If the estate includes out-of-state property, you may need to coordinate with those states’ rules too. All of this fits into the broader set of estate settlement paperwork for Maine residents.

Common mistakes people make

  • Filing Form 706ME only when tax is owed not realizing the form is due regardless of tax liability.
  • Misclassifying the decedent’s residency Maine looks at domicile, not just where someone died or owned a vacation home.
  • Leaving out assets like digital accounts, cryptocurrency holdings, or small business interests because they’re hard to value.
  • Assuming life insurance proceeds aren’t part of the estate they are, if payable to the estate or if the decedent owned the policy.

How does this connect to estate planning documents?

Having clear, up-to-date estate planning documents makes tax compliance easier later. A well-drafted will, trust, and beneficiary designations help avoid ambiguity about who inherits what and whether assets pass outside probate (and potentially outside the taxable estate). Reviewing those documents ahead of time is part of preparing for tax compliance in Maine.

Where do you file and what forms are involved?

Form 706ME and all supporting schedules go to the Maine Revenue Services, Estate Tax Unit, PO Box 1075, Augusta, ME 04332-1075. You’ll also need to file federal Form 706 if the estate exceeds the federal exemption ($13.61 million in 2024). Maine requires a copy of the federal return if one is filed even if it’s not required federally. More details on required forms and timing are covered in our guide to estate administration tax forms in Maine.

For official guidance, Maine Revenue Services publishes the Estate Tax page, which includes current forms, instructions, and updates to exemption amounts.

Next step: If the decedent was a Maine resident and the estate includes more than $6.4 million in assets, gather asset valuations and begin completing Form 706ME. Even if you’re unsure whether the estate hits the threshold, review the Maine inheritance tax filing requirements page it walks through the residency test, valuation rules, and deadlines with plain-language examples.