Permanent Indefinite Appropriation
A permanent indefinite appropriation occurs when Congress provides form of authorization and appropriation at once:
a “permanent indefinite” appropriation is open ended as to both period of availability and amount. Examples are 31 U.S.C. § 1304 (payment of certain judgments against the United States) and 31 U.S.C. § 1322(b)(2) (refunding amounts erroneously collected and deposited in the Treasury).
Source: GAO, Principles of Federal Appropriations Law, 4th ed., 2016 rev., ch. 2, GAO-16-464SP (Washington, D.C.: Mar. 2016), page 2-11.