State sales tax return historical report.
Colorado Department of Revenue
REV1/30.23/INTERNETLibrary has January 2021 - December 2021
2021
| January (PDF) | February (PDF) | March (PDF) | April (PDF) |
| May (PDF) | July (PDF) | August (PDF) | |
| September (PDF) | October (PDF) | November (PDF) | December (PDF) |