Broad responsibility by Congress that government agencies have the power to spend federal funds. Congress can specify criteria for the spending of these funds. For example, it may stipulate that a given agency must spend within a specific year, number of years, or any time in the future. The basic forms of budget authority are; appropriations, authority to borrow, contract authority, and authority to obligate and expend offsetting receipts and collections. The period of time during which Congress makes funds available may be specified as one-year, multiple years or no year. The available amount may be classified as either definite or indefinite; a specific amount or an unspecified amount can be made available. Authority may also be classified as current or permanent. Permanent authority requires no current action by Congress.