Colorado does tax retirement income, however a hefty exclusion is given for retirement and pension income.
Here is the link to the Colorado retirement exclusion:
https://www.colorado.gov/pacific/sites/default/files/Income25.pdf
Since you have to put your Social Security, Retirement and Pension income in the Federal return, you can go ahead and add Colorado. The figures will automatically flow over to the state return. See how the exclusions work out for you. You can either delete the state or choose not to file your state.
You do not have to pay for Colorado until you decide to file.
