@DaveF1006 Thanks for replying. I read this document
Colorado Regulation 39-22-109 states:
Income from the exercise of employee stock options is Colorado-source income if such income is treated as compensation for federal tax purposes and to the extent the employee worked in Colorado during the period the employee was required to work for the employer prior to the exercise of the option.
Do you think it is applicable to me and I have to pay Colorado taxes for RSU since I was in Colorado when my employer granted me stocks
