When you complete your state tax returns you will be asked for the dates that you were in each state. These are the dates that TurboTax will use to apportion your income from each state. The date your employer changed your address is not reported to the states or the IRS. The dates of residency are the dates you provide. You are not doubled taxed on the same amount of income. Generally your new home state will give you credit for the portion of your income that you paid taxes on to your old state.
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