require that county treasurers calculate excise tax using the amount shown on a bill of sale for a used vehicle sold, leased, or transferred by a person other than a licensed motor vehicle dealer.

HB 1321 requires county treasurers to calculate excise tax on used vehicles sold by private individuals (not licensed dealers) using the amount listed on the bill of sale, rather than the vehicle's retail value from a dealer guide. It directly affects private sellers and buyers of used vehicles, as well as county tax offices responsible for collecting the tax. The bill mandates that both parties submit a bill of sale to the treasurer; if missing, tax is assessed based on the dealer guide value. This change replaces the previous default method for private sales, ensuring tax is calculated from the actual transaction amount documented on the bill of sale.