Signature of Seller. Customize and Download this "Bill Of Sale With Payment Plan".Vehicle Payment Plan Agreement. A vehicle payment plan agreement is a contract between a buyer and seller of a vehicle that agrees to installment payments. A HarrisWalz administration would introduce a "firstever tax incentive" for homebuilders who sell starter homes to firsttime homebuyers. BidenHarris Administration issues final guidance to help people with Medicare prescription drug coverage manage prescription drug costs.