How do semipostal stamps raise money for charity?

Semipostal stamps, also known as charity stamps, raise money for humanitarian or charitable causes through their unique pricing structure. These stamps are sold at a premium over their standard face value.12

When a collector or member of the public purchases a semipostal stamp, the additional amount paid—the overage—is directed toward a specific charitable organization or cause rather than solely covering the cost of postal services. This mechanism allows postal authorities to facilitate public support for various social or humanitarian initiatives through the hobby of philately.12