Due to issues caused by the Crowdstrike update, the Colorado Department of Revenue, Taxation Division is experiencing service disruptions. There currently is no timeline for when service levels are fully restored.


Contact the Collections Section

Phone: (303) 205-8291

Fax: (303) 866-2037

Hours of Operation:

  • Monday-Thursday: 8:00 a.m. to 4:30 p.m.
  • Friday: 9:00 a.m. to 4:30 p.m.

Mailing Address:

Colorado Department of Revenue
Attn: Collections
P.O. Box 17087
Denver, CO 80217-0087