DOR Taxation web site

Mailing Addresses

Colorado Department of Revenue
1375 Sherman St.
Denver, CO 80261

Use the following "Plus-4" numbers to get returns and payments routed to the correct tax office within the department:


80261-0004 notice of deficiency, tax protests, delinquent tax payments
80261-0005 individual income tax, property tax/rent/heat rebate applications, amended income tax, real estate conveyance forms
80261-0006 partnership, corporation, fiduciary income tax
80261-0007 severance tax
80261-0008 estimated, extension and e-file income tax payment coupons/vouchers
80261-0009 withholding tax, annual withholding reconciliations and miscellaneous business taxes (e.g., waste tire, fuel, heavy truck sales, aviation, prepaid wireless E911 surcharge)
80261-0013 sales tax, use tax, county lodging, county short term rental, local marketing district tax, rural transportation authority