A tax which is proportional to the price of the item being taxed. This type of tax is often preferred since it is based on the value of the item being purchased.

Property tax is an ad-valorem tax, meaning the amount owed ... "26 CFR § 1.856-10 - Definition of Real Property." Tax Foundation. "Glossary: Property Tax." Tax Foundation. "States Should Continue ...

In the U.S., the concept of sin tax traces its roots to 17th-century Massachusetts, which levied an ad valorem tax—tax based on fractional wholesale or retail price—on imported goods such as ...