Telephone Numbers: Colorado Department of Revenue. Colorado Department of Labor and Employment: (303) 318-9100 (Denver-metro area) or (800) 480-8299 (outside the Denver-metro area).

Form to print, complete, and mail in to register as a Colorado business and receive a Colorado UI Tax Employer Account number and a Department of Revenue account number.

Register online as a Colorado business and receive a Colorado UI Tax Employer Account number and a Department of Revenue account number. (New businesses only)

Change form for the Colorado Department of Revenue. Use for change of ownership, address, trade name, or closure of business or end of liability for withholding tax.

Change of address form for the Colorado Department of Labor and Employment.

Colorado Department of Revenue

Form DR 1094. Remit withholding tax with this form if you have not yet received your coupon book from the Colorado Department of Revenue.

Register to pay income tax withholding electronically.

Colorado Withholding Tax Requirements. An overview for employers. (3 pages)

Colorado business registration forms on the Department of Revenue website.

New hire reporting online.

Register to file UI wage reports and UI tax reports electronically.

Aurora Occupational Tax return.

Denver Tax Guide: Occupational Privilege Tax.

Denver tax registration form.

Glendale Occupational Tax Monthly/Annual Return. Glendale Occupational Tax Quarterly Return. File these returns even when no tax is due. Report changes of address, ownership, phone, or out of business on these forms.

Greenwood Village occupational tax form.

Sheridan Occupational Tax Monthly/Annual Return (10 or more employees). Sheridan Occupational Tax Quarterly Return (fewer than 10 employees). File these returns even when no tax is due.

Colorado Small Business Development Centers. Counseling, training, tools.

SCORE, Colorado chapter. "An all-volunteer, non-profit group of local active and retired male and female business people interested in helping you live your dreams -- to start up a business or make your existing small business more successful."