In the theology of the Roman Catholic Church, "works of supererogation" (also called "acts of supererogation") are those performed beyond what God requires.
According to the classic teaching on indulgences, the works of supererogation performed by all the saints form a treasure with God that the Church can apply to exempt repentant sinners from the works of penitence that would otherwise be required of them to achieve full reconciliation with the Church.