Tax Calculator Disclaimer: This estimator is designed to give the taxpayer or prospective buyer an estimate of property taxes for a parcel of real estate or a motor vehicle. The results will be based on a few parameters the user enters. SC Vehicle Property Tax. Although SC ranks as one of the lowest states for property taxes, according to Wallethub, it is on the high side for vehicle taxes in relation to income.But, the taxes are pretty reasonable overall. The Auditor's office calculates millage to satisfy annual budget requirements for Charleston County, including 41 municipalities and other taxing authorities. In addition, this office calculates, creates and mails tax bills for real estate, mobile homes, motor vehicles, watercraft, aircraft and business-owned personal property.