You were a part-year resident of 2 states during 2020, so you have to file a resident state return in both states - if required. Each state of different rules for income taxes. The state of Michigan states the requirements to file a MI state tax return as - Individuals must file if they owe Michigan tax, if they are due a refund, or if their federal AGI exceeds the exemption allowance. Residents are allowed $4,750 for each exemption, plus various special exemptions. Part-year residents must prorate the exemption allowance. TurboTax will transfer your federal AGI over to your state returns. If your exemption allowances exceed your federal AGI, you won't be required to file the state return.
Most states divide the income earned in that state by the total annual income to come up with a percentage. That percentage is then applied to the state tax on the entire year's income—no matter where it was earned—to prorate the tax liability. TurboTax follows the rules for each state.
How do I file a part-year state return? The link has links at the bottom that explain in greater detail how the taxes are calculated and how to allocate your income between states. @Saugatuck71
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