Also known as: necessary & proper · necessary-and-proper · elastic clause · sweeping clause
Written by attorneys · grounded in primary & secondary sources — see below
A constitutional grant of authority that permits Congress to enact laws appropriate for carrying into execution its enumerated powers. The clause supplies auxiliary power to select convenient means rather than an independent source of substantive legislative authority.
Congress enacts a statute creating the Federal Investment Bank to centralize bond issuance for the Treasury and to standardize credit facilities for banks engaged in interstate lending. Riverbend Community Bank challenges the charter as exceeding enumerated authority. The statute qualifies as a permissible means because it directly implements Congress's powers to tax, borrow, and regulate commerce.
Congress creates FedRetail Clear to process all interstate retail transactions and share data with federal tax authorities. MetroMart sues, claiming the entity lacks constitutional foundation. The clearinghouse functions as an appropriate instrument because it facilitates collection of taxes and regulation of interstate commerce.
Select any source to read its text and confirm it supports the definition.
Congress creates a national repository to compile and transmit commercial records needed for uniform bankruptcy administration. A state agency refuses to supply data, asserting local control. The repository statute is valid because it selects a convenient means to execute the bankruptcy power.
Congress charters an entity to finance and coordinate improvements to roads and ports used in interstate trade. A municipality attempts to block the entity's projects with local permitting rules. The charter is a permissible auxiliary measure because it executes the commerce power through convenient fiscal means.
Congress establishes an office to gather and transmit proof required for enforcement of federal criminal statutes on the high seas. A defendant objects that the office exceeds enumerated authority. The statute is valid because the office supplies an appropriate instrument for executing the piracy power.
Congress directs creation of a central registry of militia officers and armaments to facilitate rapid federalization during invasion threats. A state withholds records, claiming exclusive authority. The registry qualifies as a proper means because it directly aids execution of the militia powers.
No. The clause authorizes Congress to select appropriate means for executing enumerated powers such as taxing, borrowing, and regulating commerce. It does not create independent substantive authority to legislate on any subject.
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A statute qualifies when it is plainly adapted to a legitimate end under an enumerated power, is not prohibited by the Constitution, and is consistent with its letter and spirit. Chartering a corporation to facilitate fiscal or commercial operations satisfies the test.
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No. The clause cannot convert noneconomic local conduct into a proper subject of federal regulation merely by asserting downstream effects on markets. Aggregation applies only to economic activity.
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Yes. A state law that singles out a federally chartered entity for unfavorable treatment burdens the execution of enumerated powers and violates intergovernmental immunity.
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No. The clause permits implementation of enumerated powers but does not authorize Congress to transfer fundamental legislative determinations to the executive branch.
…law is hazy but no one doubts federal power over procedure. Wayman v. Southard , 10 Wheat. 1. The Judiciary Article and the “necessary and proper” clause of Article One may fully authorize legislation, such as this section of the Judiciary Act. In this Court, stare decisis , in statutory construction, is a useful rule, not an…