011-2 Wyo. Code R. § 2-11
(a) Tax Rate for Purchases. The appropriate tax rate on the purchase of a motor vehicle shall be comprised of state sales or use taxes and applicable county option sales or use taxes. The appropriate tax rate shall be determined by the tax rate in effect in the county of the purchaser's principal residence on the date of the sale
(b) Any purchase option exercised at the end of a lease agreement is a separate taxable transaction.
(c) Wyoming Sales/Use Tax Statement. All vendors of motor vehicles shall provide purchasers with a copy of the original sales invoice and a copy of the form titled "Wyoming Sales/Use Tax Statement," as prescribed by the Department. To calculate the correct tax owed the vendor shall assess the rate in effect in the county of the purchaser's residence. An additional copy of the statement shall be furnished by the vendor to the County Clerk.
011-2 Wyo. Code R. § 2-11