"Starting from the date you move to Maine, you are considered a Maine resident, and all your world-wide income is taxed proportionately."
That's true only if your income is evenly spread throughout the year.
Once you become a Maine resident, all your income from that date forward is taxable by Maine. For example, if you earn 30% of your income after becoming a Maine resident, then that 30% is taxable by Maine - even if you were a Maine resident only12.3% of the year.
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
