"I did take an IRA distribution in which Colorado tax was withheld and Colorado did refund"
Then Line 18 of your MI-1040 should be zero, since in fact you paid no tax to CO.
In the Personal Info section of TT, did you and your wife both indicate that you had no "Other State Income"? And did you each enter your "State of Residence" correctly?
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
