South Carolina law requires that you register your newly purchased vehicle within 45 days of the purchase date. Use our templates to draft South Carolina bills of sale.Motor Vehicle Bill of Sale – This document will provide information regarding the identification, sale, purchase, and change of ownership of a motor vehicle. How do I fill this out? To fill out the South Carolina Bill of Sale Affidavit, you need to gather detailed information about the seller, buyer, and vehicle. South Carolina Bill of Sale Form ✓ easily fill out and sign forms ✓ download blank or editable online.