Wyoming Statutes Title 39. Taxation and Revenue § 39-15-110. Statute of limitations

(a) No credit or refund shall be allowed after three (3) years from the date of overpayment. The receipt of a claim for a refund by the department shall toll the statute of limitations.

(b) The department may bring an action to recover any delinquent taxes, penalty or interest in any appropriate court within three (3) years following the delinquency. In the case of an assessment created by an audit, the delinquency period is deemed to start thirty (30) days after the date the assessment letter is sent. Any tax penalty and interest related to the audit assessment shall be calculated from the filing period during which the deficiency occurred. In any such action a certificate by the department is prima facie evidence of the amount due.