How McCulloch v. Maryland Shaped the Necessary and Proper Clause

In McCulloch v. Maryland (1819), Chief Justice John Marshall interpreted the Necessary and Proper Clause to mean that Congress may use any means that are appropriate and plainly adapted to carrying out its enumerated powers, so long as those means are not prohibited by the Constitution. “Necessary” does not mean absolutely essential. It means useful, conducive, or reasonably suited to a legitimate constitutional end. That reading gave the federal government room to act in ways the Constitution does not explicitly spell out, and it remains the foundation of federal power more than two centuries later.¹

The Clause and the Fight Over One Word

The Necessary and Proper Clause is the last item in Article I, Section 8, the section that lists Congress’s specific powers. After enumerating those powers, Clause 18 adds that Congress may “make all Laws which shall be necessary and proper for carrying into Execution the foregoing Powers, and all other Powers vested by this Constitution in the Government of the United States, or in any Department or Officer thereof.”²

The clause was contested from the beginning. Everyone agreed it let Congress do more than the bare minimum listed in Section 8. The disagreement was over how much more, and it turned on the word “necessary.” One reading held that Congress could reach only for tools without which an enumerated power would be meaningless. The other held that “necessary” covered anything reasonably suited to executing a granted power. The Constitution did not resolve the argument. McCulloch did.

How the Case Got to the Court

Congress chartered the Second Bank of the United States in 1816. The bank was unpopular in many states, which viewed it as federal overreach and as competition for state-chartered banks. In 1818, Maryland imposed a tax on any bank operating in the state that was not chartered by the state legislature. The tax was aimed at the Baltimore branch of the Second Bank.³

James William McCulloch, who ran the Baltimore branch, refused to pay. Maryland sued and won in state court. The Supreme Court took the appeal with two questions in front of it: whether Congress had the power to charter a national bank at all, and whether Maryland could tax that bank if it did.

Marshall’s Rule

Writing for a unanimous Court, Marshall rejected Maryland’s argument that “necessary” meant indispensable. He noted that the clause is placed among Congress’s granted powers, not among the limits on those powers. If the Framers had wanted to confine Congress to actions that were strictly essential, they would have said so. Instead, “necessary” should be read to mean useful, appropriate, or conducive to carrying out an enumerated power.¹

Marshall then set out what became the governing test: “Let the end be legitimate, let it be within the scope of the constitution, and all means which are appropriate, which are plainly adapted to that end, which are not prohibited, but consist with the letter and spirit of the constitution, are constitutional.”³ The structure is three-part. The goal Congress is pursuing must be one the Constitution authorizes. The means must be reasonably suited to that goal. And the means must not violate any other constitutional provision.

A national bank, Marshall concluded, was a reasonable means for carrying out several enumerated powers, including collecting taxes, borrowing money, regulating commerce, and supporting armies. That made the bank constitutional.¹

Implied Powers

Marshall’s opinion created what is now called the doctrine of implied powers. The federal government holds not only the powers the Constitution lists but also those reasonably necessary to make the listed ones work. Chartering a bank appears nowhere in Section 8. But taxing, borrowing, and regulating commerce do, and a bank is a practical tool for all of them. The power to create the bank is therefore implied by the powers that are enumerated.

Marshall added that the Constitution itself supports this reading. Unlike the earlier Articles of Confederation, the Constitution contains nothing that restricts Congress to only expressly stated powers.³ The Tenth Amendment reserves powers “not delegated” to the federal government, but Marshall treated the Necessary and Proper Clause as itself a delegation. Implied powers are delegated powers that simply are not spelled out word for word.

The clause also applies beyond Congress’s own list. Its text reaches “all other Powers vested by this Constitution in the Government of the United States, or in any Department or Officer thereof.” The Constitution assumes federal departments and officers will exist without expressly giving Congress power to create them. The clause fills that gap.²

The Second Holding: States Cannot Tax Federal Instruments

The tax question is often overshadowed by the implied-powers holding, but it was the other half of the decision. Marshall held that Maryland could not tax the Bank. His reasoning ran through the Supremacy Clause: federal law is supreme over state law, and if a state could tax a federal institution, it could tax that institution out of existence. “The power to tax involves the power to destroy,” he wrote, and one government cannot destroy the instruments of a government that is supreme over it.³

The ruling had a limit. States could still tax the real property of a federal bank located in the state and could tax income that state citizens earned from their bank investments, because those taxes applied to everyone alike. What a state could not do was single out a federal institution for a special tax designed to burden it.³ The Maryland tax was struck down unanimously.

How Modern Courts Apply the Clause

Marshall’s test has proved durable, but it is not unlimited. Two modern decisions show both sides.

The Reach: United States v. Comstock

In United States v. Comstock (2010), the Court upheld a federal law authorizing civil commitment of sexually dangerous federal prisoners beyond the end of their prison terms. The Constitution nowhere gives Congress explicit power over civil commitment. The Court sustained the statute anyway, reasoning that Congress has broad authority as custodian of federal prisoners and that civil commitment was a reasonable extension of that custodial role. The analysis looked at whether the statute had a rational connection to an enumerated power, whether the means were useful, whether it fit a history of related federal action, whether it respected state sovereignty, and whether it was narrow rather than sweeping.⁴ The framework is a modern version of Marshall’s question: is the law a reasonable means to a legitimate constitutional end?

The Limit: NFIB v. Sebelius

Two years later, the Court showed where the clause runs out. The Affordable Care Act’s individual mandate required people to buy health insurance, and the government defended it as a necessary and proper means of regulating the interstate insurance market. The Court disagreed. Chief Justice Roberts held that the clause does not permit Congress to create the very problem it then claims to be solving. Forcing people into a market so Congress can regulate them in it is not “derivative of, and in service to, a granted power.” It is a new, freestanding power the Constitution does not authorize.⁵

The decision leaned on the word Marshall paired with “necessary.” Even a means arguably necessary to make broader reforms work is not a “proper” means if it would hand Congress a power far beyond what the Constitution grants.⁵ Marshall’s test requires both words to be satisfied, and NFIB enforced the “proper” half as an independent limit.

The Enduring Framework

Marshall’s opinion set a default posture toward federal power that every generation of judges has worked within. Congress does not need a constitutional amendment each time it confronts a new problem; it needs a rational connection between the tool it chooses and a power the Constitution already grants. At the same time, Marshall never gave Congress a blank check. The end must be legitimate, the means must be appropriate, and neither can violate the rest of the Constitution. When modern courts push back on federal overreach, they are usually not rejecting Marshall. They are applying the other half of his test.

1
Constitution Annotated. Necessary and Proper Clause Early Doctrine and McCulloch v. Maryland
2
Constitution Annotated. Article I, Section 8, Clause 18
3
Justia. McCulloch v. Maryland, 17 U.S. 316 (1819)
4
Justia. United States v. Comstock, 560 U.S. 126 (2010)
5
Justia. National Federation of Independent Business v. Sebelius, 567 U.S. 519 (2012)