Colorado Revised Statutes Title 39. Taxation § 39-22-603.5. Frivolous returns

(a) Does not contain information on which the substantial correctness of the return may be judged; or

(b) Contains information that on its face indicates that the return is substantially incorrect; and

(c) The conduct described in either paragraph (a) or (b) of this subsection (1) is due to either:

(2)(a) If any person files a frivolous return, the executive director may calculate the person's Colorado taxable income and make an assessment based on such information as is available at the time the return is filed.

(b) If the tax calculated by the executive director is greater than the amount theretofore assessed or paid, a notice of deficiency shall be mailed to the taxpayer by first-class mail as set forth in section 39-21-105.5.