You can give Maine Revenue Services a call at (207) 626-8475 to ask about individual income tax questions, but it might be posted somewhere on their website saying how many years back you can file if you don’t normally file.

http://www.maine.gov/revenue/about/taxpayer-rights

You can download the 1040ME back to 2012

http://www.maine.gov/revenue/tax-return-forms/individual-income-tax-2022