An ad valorem tax is a tax whose amount is based on the value of a transaction or of a property. It is typically imposed at the time of a transaction, as in the case of a sales tax or value-added tax (VAT). An ad valorem tax may also be imposed annually, as in the case of a real or personal property tax, or in connection with another significant event. In some countries, a stamp duty is imposed as an ad valorem tax.

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