CONTACT US

Employers are encouraged to communicate comments and questions regarding the solvency tax surcharge (STS) using one of the following methods.

MAIL

Unemployment Insurance Operations
P.O. Box 8789
Denver, CO 80201-8789

E-MAIL

unemp.tax@state.co.us (Please type “STS” in the subject line.)

TELEPHONE

303-318-9100 (Denver-metro area)
1-800-480-8299 (outside Denver-metro area)