Where the sum of the federal gross estate and adjusted taxable gifts exceeds the Maine exclusion or if the estate contains Maine elective property or Maine qualified terminable interest property and where the estate includes property sourced to Maine, a personal representative must file a Maine Estate Tax return (Form 706ME) with required attachments within nine months of the decedent's date of death, unless an extension of time to file has been granted. If the estate is required to file a federal Form 706, a copy of that form, including all schedules and attachments (including Worksheet 706C) must be filed with Form 706ME. If the estate is not required to file federal Form 706, a pro forma federal Form 706 must be attached to Form 706ME and must include all of the information, schedules and attachments that would be required if a federal return was required to be filed.
18- 125 C.M.R. ch. 601, § 03