State
DR 0160: Certificate of Exemption for Colorado State Sales/Use Tax Only
DR 0563: Colorado Sales Tax Exemption Certificate — Multi-Jurisdiction
DR 0240: Colorado Fuel Tax Exemption Certificate
City and County of Denver
City and County of Denver: Retail Sales/Use/Lodger’s Tax License
City and County of Denver: Sales Tax Exemption
Federal
W-9: Request for Taxpayer Identification Number and Certification