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Surtax: The portion of a semipostal stamp purchase price exceeding the postage value. The surtax is designated for donation to a charity or some other purpose.
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Originally, the 40¢ paid for the nondenominated stamp included 32¢ of postage and 8¢ of charity surtax. When the 1-ounce first-class domestic letter rate went up to 33¢ on Jan.
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See also: Used, Catalog, Catalogue, Stamp, Cover

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