one more saying you do not have to file, unless is a taxable income
https://www.taxesforexpats.com/expat-tax-advice/statedocs/CO%20residency.pdf
Anyway I input the loss in the software for rental loss, and of course doesn't change anything.
I think you do not have to file it, it doesn't make any sense, I found 3 different sources from the State of Colorado, saying you do not have to file unless you have a taxable income.
