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in proportion to the value (used especially of duties on imports that are fixed at a percentage of the value as stated on the invoice).
Historical Examples

Bicycles entering Belgium pay an ad valorem duty of 12 per cent.
Belgium George W. T. (George William Thomson) Omond

There is an ad valorem duty of 8% on imports and of about 1% on exports.
Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 1 Various

The war introduced new considerations into the problems of ad valorem valuation.
The Economic Aspect of Geology C. K. Leith

Down to the year 1834 the duty was an ad valorem one of 96 per cent.
The Commercial Products of the Vegetable Kingdom P. L. Simmonds

ad valorem duties are levied at a certain rate per cent on the value of the articles taxed.
Citizenship Emma Guy Cromwell

The enumerated articles were not to be subject to the ad valorem duty of five per centum.
Abridgment of the Debates of Congress, from 1789 to 1856, Vol. I (of 16) Thomas Hart Benton

But he would only vote for the ad valorem system of duties, which he deemed the most beneficial and the most equitable.
Thirty Years’ View (Vol. I of 2) Thomas Hart Benton

Revenue is raised chiefly by customs dues on spirits and tobacco and a general 10% ad valorem duty on most goods.
Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 1 Various

To protect this industry Congress put on a specific duty of five cents a pound and an ad valorem duty of 30 per cent.
Creative Chemistry Edwin E. Slosson

The essence of the ad valorem method of valuation above described is income-producing capacity.
The Economic Aspect of Geology C. K. Leith

adjective, adverb
(of taxes) in proportion to the estimated value of the goods taxed Abbreviation ad val, a.v., A/V

type of customs duties, 1711, Latin, “in proportion to the value” (see value).