Contact the Collections Section

    Phone: (303) 205-8291

    Fax: (303) 866-4771

    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