A tax based on the assessed value of an object, such as real estate or personal property, is known as an ad valorem tax. Property taxes are the most frequent ad valorem taxes imposed on real estate. Ad valorem taxes, on the other hand, can be used in a variety of tax situations, including import duty taxes on items from other countries. Ad valorem taxes are imposed on both real estate (land, buildings, and other structures) and significant personal items (cars and boats).