Colorado use tax is calculated by adding up all purchases you made from out of state (or online from a state other than CO) while a resident in Colorado and multiplying that by your 2.9% sales tax rate or if you are in a district with special district taxes then you will use that rate. There is a credit available for sales tax paid to another state on the purchases.
https://www.colorado.gov/pacific/tax/use-tax-file
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