C.R.S. § 39-27-305
39-27-305. Credit for purchases
39-27-305. Credit for purchases. Any licensee purchasing more tax-paid and fee-paid motor fuel in this state than the licensee uses in this state during the course of a reporting period shall be permitted a credit against future tax and fee liability for the excess tax-paid and fee-paid fuel purchased. Upon request, this credit may be refunded to the licensee by the department in accordance with the agreement.