When you move to CO your employer needs to stop withholding NY tax and start withholding CO tax. Make sure that the payroll department knows to do that. You will prepare and file a federal return and two state returns--one for NY and one for CO. When you prepare your federal return you will be able to enter the information that you lived in two different states and earned income in two different states in 2020. You will indicate the dates that you lived and earned income in each of the states. Then you will end up preparing and filing partial year returns for each state.
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