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@ErnieS0  My RSU vesting period is 4 years. I mean every year I get 25% of the stock. 

At present, my employer has withheld all the RSU related taxes with the state of Michigan. Is that right ? Or shall ask my employer to withheld my taxes with Colorado as well as with Michigan ?

Does it mean that I will need to pay some portion of my taxes to Colorado for 4 years ?