About international reply coupons

When one writes to a stranger and requests a reply, it is considered polite to enclose a self-addressed stamped envelope. This works well when both persons live in the same country; however, if they are from different countries, the enclosed postage stamp will not be valid.

All member countries

This technical problem was solved in 1906 when the Universal Postal Union, during its Congress in Rome, introduced the International Reply Coupon service. As the service began before the days of airmail, the earliest coupons could only be redeemed for a single-rate ordinary postage stamp to a foreign country. In terms of today's UPU Convention, International reply coupons (IRC) are exchangeable in all member countries for the minimum postage of a priority item or an unregistered airmail letter sent to a foreign country.

Mandatory to exchange

The UPU's International Bureau processes several million coupons each year and deals with of all accounting aspects. The International Bureau does not sell IRCs directly to customers; they must buy them from their local post office. Although Posts are not obliged to sell IRCs, it is mandatory for Posts to exchange the coupons. If a Post does not sell IRCs, it is possible to purchase them in a post office located in a neighbouring country.