Odometer Declaration. A confusing and convoluted document that outlines the selling price, fees, taxes, your trade in, and more.Use this car purchase agreement template to customize the financing information for your car along with other required details. How to submit this form: Submit this form along with required documents and applicable tax to the county tag office in the county where the primary purchaser. If you are in doubt concerning the transferring, buying, selling or mortgaging of a motor vehicle, always call your Clerk of Courts for complete information. It's a general agreement that is designed to meet the needs of most real estate transactions through customization.