Maine recently published updated Specifications & Instructions for 1099/W-2G forms and W-2 forms. These specifications are used by filers to transmit withholding reporting data to the Maine Revenue Services (MRS) using the MEETRS filing portal.
The most notable update is the due date for both 1099s and W-2 forms: MRS has advanced their due date for 1099 and W-2 reporting to January 31, 2018 for tax year 2017. This brings Maine in line with the federal standard by advancing the due date for these forms.
The specifications themselves remain largely unchanged. The only edits made to either specification format is the tax year was adjusted to 2017.