A bill of sale or invoice may be used in lieu of the seller(s) completing the Tax Affidavit and signing this section. The form consists of the significant vehicle, buyer, seller, and sale data, along with affirming signatures from both parties.The completed form includes the purchase price, date of sale, a description of the boat, and the signatures of the buyer and seller. You need the original boat title, a bill of sale, and the Application for Texas Title (Form 130U). This form below is designed for use on upon the sale of a boat or vessel.