War tax

A war tax stamp is used to offset governmental costs incurred during wartime. It is usually a required/obligatory stamp that was added to all letters, so it is a type of postal tax. They are typically used for a limited time.

Many British colonies used these during World War I often definitives overprinted WAR STAMP. See: WAR STAMP.

 File:Canada 1c war tax.jpg|One of Canada's war tax stamps. File:Stamp Spain 1875 5c war tax.jpg|Spain 5c value of 1875. File:Port cols war tx.A.webp|Portuguese Africa issue 

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