After you have fully filled in every scrap of income in the Federal section....you will need to go thru the Former state's, and Maine's "Part-Year" tax return Q&A. You should be able to "allocate" what $$ you received while you were a resident in each state.
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Note: that all dividends and interest you received yourself, or into your accounts, after you moved to Maine is considered Maine sourced income.
....all Retirement $$ you received yourself, or into your accounts, after you moved to Maine is considered Maine income.
.......all stock, bond capital gains, or capital gains distributions from mutual funds that you received yourself, or into your accounts, after you moved to Maine is considered Maine sourced income.
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Likewise for the former state...only the $$ you received yourself, or into your accounts, before you moved to Maine.
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......makes little to no difference what state the bank or brokerage is located in, all the investment income belongs to the state you actually lived in at the time you lived in that state. Same thing for 1099-R $$ from retirement pensions, 401k's, or IRAs.......those $$ may have to be divided up/allocated according to what state you lived in at the time the $$ were distributed.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
