McCulloch v. Maryland — Implied Powers & Federal Supremacy

McCulloch v. Maryland, 17 U.S. (4 Wheat.) 316 (1819), is the foundational Supreme Court decision on two doctrines that define the scope of federal power: implied powers and federal supremacy over state interference. Written by Chief Justice John Marshall for a unanimous Court, McCulloch answered two questions that go to the heart of the constitutional design: Can Congress exercise powers not explicitly listed in the Constitution? And can states use their taxing authority to burden or destroy federal institutions? Marshall's answers — yes to the first, no to the second — established the constitutional framework that makes the modern federal regulatory state possible. The opinion's central passage — "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" — became the governing standard for Necessary and Proper Clause analysis for the next two centuries. And the opinion's other landmark line — "the power to tax involves the power to destroy" — permanently prevented states from using their taxing authority as an instrument of resistance against federal programs they disliked. Together, McCulloch's two holdings give Congress broad latitude to choose the means of executing its powers while insulating those means from state interference — the constitutional foundation for the Federal Reserve, federal regulatory agencies, federal grants, and the intergovernmental structure of American federalism.

Current Law (2026)

Legal Authority

• U.S. Const. art. I, § 8, cl. 18 — "The Congress shall have Power . . . To 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"
• U.S. Const. art. VI, cl. 2 — Supremacy Clause: "This Constitution, and the Laws of the United States which shall be made in Pursuance thereof . . . shall be the supreme Law of the Land; and the Judges in every State shall be bound thereby, any Thing in the Constitution or Laws of any State to the Contrary notwithstanding"
• U.S. Const. art. I, § 8, cls. 1–17 — Enumerated powers Congress may execute through Necessary and Proper means (commerce, taxing, spending, war, coinage, patents, etc.)
• 12 U.S.C. § 1 — Federal Reserve Act (1913): establishes the Federal Reserve System as a federal instrumentality — the direct institutional successor to the Bank of the United States whose constitutionality McCulloch upheld
• 31 U.S.C. § 321 — Treasury Department general authority: broad statutory powers derived from Congress's Article I authority, implemented through Necessary and Proper power
• Osborn v. Bank of the United States, 22 U.S. (9 Wheat.) 738 (1824) — Extended McCulloch: states may not sue the Bank of the United States (or tax its officers); affirmed federal judicial jurisdiction over cases to which the Bank is a party
• Collector v. Day, 78 U.S. 113 (1870) — Attempted to create a parallel state immunity: federal government may not tax state judges' salaries; this principle was subsequently limited by Graves v. New York ex rel. O'Keefe (1939), which held Congress may tax state employee salaries

Key Mechanics

McCulloch v. Maryland (1819) resolved two foundational constitutional questions: (1) Does Congress have the power to establish a national bank? and (2) Can Maryland tax it? Chief Justice Marshall answered yes to the first and no to the second. On the bank's constitutionality: although chartering a bank is not among Congress's enumerated powers, the Necessary and Proper Clause allows Congress to employ any means "plainly adapted" to executing its enumerated powers — taxing, borrowing, and regulating commerce all support a national bank. Marshall's interpretive method was expansive: "necessary" means "convenient, useful, or essential" — not "absolutely indispensable." This reading of the Necessary and Proper Clause has supported an enormous range of congressional legislation over two centuries, including the federal criminal code, the Social Security Act, and civil rights legislation. On Maryland's tax: the Supremacy Clause prohibits states from taxing federal instrumentalities because "the power to tax involves the power to destroy" — a state could effectively nullify federal programs by taxing them out of existence. This principle survives today, though it is limited: states may tax federal employees' income (Graves v. New York, 1939) and may impose non-discriminatory taxes on federal contractors (United States v. New Mexico, 1982). McCulloch also resolved the foundational question of constitutional interpretation: the Constitution is not a legal code to be read with the strictness of a tax statute, but "a constitution intended to endure for ages to come, and consequently, to be adapted to the various crises of human affairs."

How It Works

The Facts: A Bank, a Tax, and a Constitutional Crisis

The Second Bank of the United States was chartered by Congress in 1816, over fierce opposition from states' rights advocates who argued that the Constitution gave Congress no authority to create a bank. The Bank's Baltimore branch, operated by James McCulloch as cashier, became the flashpoint for a deliberate constitutional test case. Maryland had enacted a law imposing a tax of $15,000 per year (a substantial sum in 1819) on any bank operating in Maryland that was not chartered by the state — which meant, in practice, the Bank of the United States. McCulloch refused to pay, Maryland courts upheld the tax, and the Supreme Court granted certiorari to resolve what was then the most contested constitutional question in American politics.

The case was argued for nine days before the full Court — the greatest collection of legal talent of the era, including Daniel Webster and William Pinkney for the Bank and Luther Martin for Maryland. The constitutional stakes were enormous: if Maryland could tax the Bank, every state could, and the combined burden might destroy it. More broadly, if the Constitution's silence on "bank" meant Congress couldn't create one, then the scope of federal power was far more limited than the Federalists had assumed — and far more limited than what the country's economic development seemed to require. Marshall delivered the Court's unanimous opinion just three days after argument concluded, suggesting he (and probably his colleagues) had made up their minds before argument began.

The First Question: Congressional Power to Charter a Bank

Marshall began with what seemed like a threshold obstacle: the word "bank" appears nowhere in the Constitution. The Tenth Amendment reserves to the states powers not "delegated to the United States" — and there is no explicit delegation of bank-chartering authority. Maryland argued that "necessary and proper" meant truly indispensable: if Congress could achieve its enumerated ends without a bank, then a bank was not "necessary."

Marshall rejected this cramped reading at every level, starting with the nature of the Constitution itself:

The Constitution was ratified by the people, not the states. Maryland (and other opponents of federal power) advanced a "compact theory" — that the Constitution was an agreement among sovereign states who retained ultimate authority and could interpret (or even nullify) federal acts they deemed unconstitutional. Marshall flatly rejected this: "the government of the Union . . . is, emphatically, and truly, a government of the people. In form and in substance it emanates from them. Its powers are granted by them, and are to be exercised directly on them, and for their benefit." The Constitution was not a treaty among sovereign states; it was the supreme law enacted by the sovereign people.

A constitution, by its nature, cannot enumerate every means. Marshall observed: "A constitution, to contain an accurate detail of all the subdivisions of which its great powers will admit, and of all the means by which they may be carried into execution, would partake of the prolixity of a legal code, and could scarcely be embraced by the human mind." The Constitution's framers knew they were establishing a framework for a government that would need to adapt to circumstances they could not foresee. They chose to enumerate the great objects of government and leave the selection of means to Congress.

"Necessary" means useful, not indispensable. The word "necessary" in the Necessary and Proper Clause does not mean "absolutely indispensable" — if it did, the clause would be nearly useless, since a government can technically achieve almost anything through some combination of enumerated means without any particular instrument. In common usage and in the broader constitutional context, "necessary" means "useful," "conducive to," or "naturally related to" the legitimate end. The clause was placed in Section 8 (powers of Congress) rather than Section 9 (limits on Congress) — further evidence that it was intended to enlarge, not restrict, congressional power.

The governing standard: "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." A national bank is an appropriate, plainly adapted means of executing Congress's enumerated powers to tax, borrow, regulate commerce, coin money, and pay the national debt — all of which a bank facilitates. The bank is constitutional.

The Second Question: Maryland's Power to Tax the Bank

Having upheld the Bank's constitutionality, Marshall turned to Maryland's tax. The state argued it had sovereign power to tax all property and business within its borders — a general taxing power that could not be stripped by federal law without explicit constitutional authorization.

Marshall's response to this argument is one of the most important passages in American constitutional law:

"The power to tax involves the power to destroy." If Maryland can tax the Bank of the United States, so can every other state. The combined taxation of twenty-four states could destroy the Bank — and with it, a legitimate exercise of federal power that the Constitution authorizes. A state cannot constitutionally destroy what the Constitution authorizes the federal government to create.

States cannot use state powers to resist legitimate federal authority. The relationship between federal authority and state authority is resolved by the Supremacy Clause: where there is a genuine conflict, federal law prevails. A Maryland tax specifically designed to burden the Bank — an institution created pursuant to valid federal law — is precisely the kind of state interference the Supremacy Clause prohibits. The states retain their taxing power for their own purposes and over their own institutions; they cannot deploy that power against federal instrumentalities.

Constitutional limits run in both directions. Marshall acknowledged that the federal government similarly cannot use its taxing or regulatory power to destroy state institutions — a principle that led to the intergovernmental tax immunity doctrine (Collector v. Day, 1870, later limited). The Constitution creates a balance: neither sovereign can use its powers to obliterate the other's essential functions.

The Opinion's Broader Constitutional Vision

McCulloch is more than a decision about banks. It is Marshall's fullest statement of constitutional nationalism — his vision of a robust federal government capable of addressing national problems:

• The Constitution grants the spirit of the enumerated powers, not merely their technical letter
• Congress has broad discretion in choosing means to achieve constitutional ends
• Federal institutions are shielded from state interference by the Supremacy Clause
• The Constitution is not a compact among states but a law enacted by the sovereign people

This vision was contested in Marshall's own time — Jefferson, Madison, and Spencer Roane criticized the opinion sharply — and remains contested today in debates about the scope of federal power. But as constitutional doctrine, it has held firm for over two centuries.

Legacy: The Foundation of the Modern Federal State

McCulloch's implied powers holding is the constitutional foundation for virtually every federal institution that was not explicitly mentioned by the founders: the Federal Reserve, the FDA, the EPA, the SEC, the FBI, the Social Security Administration, the IRS, and the vast network of federal regulatory agencies. None of these appear in the Constitution's text; all are justified as appropriate means of executing enumerated powers. The Necessary and Proper Clause, as interpreted in McCulloch, is what transforms the Constitution's short list of enumerated powers into the authority for a modern national government.

The intergovernmental tax immunity doctrine from McCulloch's second holding has been significantly modified over time. Graves v. New York ex rel. O'Keefe (1939) held that the federal government can tax state employees' salaries, largely overruling Collector v. Day's reciprocal immunity. Modern doctrine allows both the federal government and states to impose non-discriminatory taxes on each other's employees and activities, but prohibits taxes that discriminate specifically against federal instrumentalities or directly interfere with federal functions — consistent with McCulloch's core holding.

The most significant modern application of McCulloch's framework comes in Commerce Clause and Necessary and Proper Clause analysis, where the Court asks whether challenged legislation is an appropriate means to execute an enumerated end. After United States v. Lopez (1995) reintroduced real limits on Commerce Clause power, the Necessary and Proper Clause became even more important as an independent basis for federal legislation — the ACA's individual mandate was upheld as within the Necessary and Proper Clause even as the Commerce Clause ground failed (NFIB v. Sebelius, 2012). See the Necessary and Proper Clause page for the full modern doctrine.

How It Affects You

If you are an ordinary citizen: McCulloch is the reason you have a federal government capable of addressing national problems — from financial crises to pandemics to environmental degradation. Without implied powers, Congress could only do what the 1787 Constitutional Convention explicitly authorized, with no flexibility to adapt to two centuries of change. The Social Security system, Medicare, the Federal Deposit Insurance Corporation, the Consumer Financial Protection Bureau, and federal food safety regulation all rest ultimately on McCulloch's expansive reading of Congress's power to choose means for executing enumerated ends. The intergovernmental immunity principle also affects you directly: federal benefits (Social Security payments, VA benefits, federal employee salaries) are protected from discriminatory state taxation by the principle McCulloch established.

If you are a state or local government official: McCulloch sets the boundary between what your state can do to federal institutions and what it cannot. States retain robust taxing authority over private property and business within their borders. But discriminatory taxation that specifically targets federal instrumentalities — agencies, contractors, federally chartered banks — violates the Supremacy Clause principle McCulloch established. The flip side: federal law cannot discriminate against state instrumentalities in a way that destroys their essential governmental functions. Modern preemption doctrine — when federal law displaces state law — is built on the Supremacy Clause framework McCulloch articulated. When your state law conflicts with a validly enacted federal statute or regulation, the federal law controls. See Federal Preemption Doctrine and Supremacy Clause for how that plays out in practice.

If you are a business in the financial or regulated industry: The Federal Reserve System — the central bank of the United States, with authority over monetary policy, bank supervision, and financial stability — is the direct institutional successor to the Bank of the United States whose constitutionality McCulloch upheld. The Federal Reserve's constitutionality rests entirely on McCulloch: nowhere does the Constitution mention a central bank, a lender of last resort, or monetary policy. The same implied powers framework authorizes the FDIC (protecting deposits through federal insurance), the OCC (chartering national banks), and federal preemption of state banking law (federally chartered banks operate under federal law that preempts many state consumer protection and usury laws). For any business navigating the intersection of federal regulatory authority and state law, McCulloch's framework — federal ends legitimate, means appropriate and plainly adapted, Supremacy Clause displaces conflicting state law — is the structural foundation.

If you are a lawyer or constitutional scholar: McCulloch is the second foundational pillar of American constitutional law alongside Marbury v. Madison (1803). Together they establish judicial review (Marbury) and the scope of Congress's implied legislative authority (McCulloch). For litigation involving the Necessary and Proper Clause, the governing test is still Marshall's: legitimate constitutional end + appropriate, plainly adapted means + not prohibited = constitutional. Post-Lopez and Morrison limits on Commerce Clause power have made the Necessary and Proper Clause analysis more important, because legislation that is not itself within the Commerce Clause may nonetheless be constitutional as a necessary and proper means of executing Commerce Clause authority. NFIB v. Sebelius (2012) demonstrated both: the individual mandate failed Commerce Clause analysis (you can't regulate inactivity) but was upheld as a necessary and proper means of making the guaranteed-issue and community-rating provisions of the ACA effective. Understanding the relationship between McCulloch's implied powers doctrine and the enumerated power being executed is essential for any federal regulatory or congressional authority analysis.

State Variations

McCulloch v. Maryland operates at the federal level, establishing the relationship between federal implied powers and the Supremacy Clause. Its direct impact on states comes through two channels:

State attempts to regulate or tax federal instrumentalities are constrained by McCulloch's Supremacy Clause holding. States may impose non-discriminatory, generally applicable taxes on federal contractors, federal employees (as of Graves, 1939), and property used in commerce that happens to involve federal programs. But states may not impose discriminatory taxes specifically targeting federal institutions, may not require federal agencies to obtain state permits as a precondition to performing federal functions, and may not impose regulations that "stand as an obstacle to the accomplishment and execution of the full purposes and objectives of Congress" (Hines v. Davidowitz, 1941).

State implied powers doctrine: State constitutions generally give their legislatures plenary (general) police powers — authority to legislate for health, safety, morals, and general welfare — without the enumeration limitation that McCulloch interprets for the federal government. State legislatures don't need an "implied powers" doctrine because they start with general authority, not limited enumerated powers. When states face constitutional limits, those limits come from their own state constitutions (express prohibitions) and from federal constitutional requirements — the Bill of Rights (as incorporated through the Fourteenth Amendment), the Commerce Clause (dormant), the Equal Protection and Due Process Clauses, and preemption by valid federal law under the Supremacy Clause McCulloch articulated.

Intergovernmental immunity in practice: States impose income taxes on federal employees, require federal contractors to comply with state labor and environmental laws, and regulate federal land lessees under general state law. The Supremacy Clause prohibits only discriminatory state regulation specifically targeting federal authority — what Marshall called using state power "to retard, impede, burden, or in any manner control, the operations of the constitutional laws enacted by congress." The line between permissible general state regulation affecting federal operations and impermissible discriminatory targeting is frequently litigated.

Pending Legislation

No federal legislation is pending to modify McCulloch v. Maryland's constitutional holdings — they are embedded in constitutional law and cannot be changed by statute. The implied powers framework McCulloch established operates through Congress's exercise of its Article I authority, and each new exercise of that authority implicitly reaffirms the doctrine.

Ongoing debates about federal implied powers surface in several legislative contexts:

• Federal agency authority: Every major regulatory statute is an exercise of Congress's implied powers to choose means (federal agencies with rulemaking authority) for executing enumerated ends (regulate interstate commerce, provide for the general welfare, coin money). Legislative debates about agency authority — including proposals to codify the major questions doctrine post-Loper Bright — are in part debates about the appropriate scope of McCulloch's implied powers holding.
• Federal preemption scope: When Congress legislates in a field, the Supremacy Clause's preemptive effect (rooted in McCulloch) displaces state law to the extent of any conflict. The scope of preemption is contested in many regulatory areas — food safety, financial regulation, pharmaceutical labeling — generating ongoing legislative debates about whether federal statutes should expressly preempt state law or leave states room to regulate more strictly.
• Cryptocurrency and central bank digital currency (CBDC): Congressional debates about whether to authorize a Federal Reserve-issued digital dollar implicate McCulloch: the authority to create a digital currency would rest on the same constitutional foundation (McCulloch's implied powers applied to Congress's enumerated power to coin money and regulate its value) as the original Bank of the United States.

Recent Developments

• 2024 — Loper Bright Enterprises v. Raimondo: The overruling of Chevron deference reinforces McCulloch's framework in a counterintuitive way: while McCulloch broadly empowers Congress to delegate authority to agencies, Loper Bright requires courts to independently review whether agencies have acted within their McCulloch-grounded statutory authority. The combination means Congress must clearly grant the authority it wants agencies to exercise — the implied powers remain broad, but their statutory implementation requires clear expression to survive judicial review.
• 2012 — NFIB v. Sebelius: The ACA case applied McCulloch's Necessary and Proper Clause analysis to uphold the individual mandate as a necessary and proper means of making the ACA's guaranteed-issue and community-rating provisions function effectively — even after finding the mandate exceeded Commerce Clause authority. The Court's N&P analysis followed Marshall's framework directly: is the mandate plainly adapted to a legitimate constitutional end (regulating the interstate health insurance market)? Yes. Is it prohibited? No. Is it within the letter and spirit of the Constitution? Yes (as tax). This is McCulloch applied two centuries later to a national healthcare system Marshall could never have imagined.
• 2022 — West Virginia v. EPA and Major Questions Doctrine: The Court held that EPA's Clean Power Plan exceeded its statutory authority — not because Congress lacks implied power to regulate carbon emissions (it clearly does, through the Commerce Clause and N&P), but because Congress must clearly delegate that specific consequential authority to agencies. The major questions doctrine is a constraint on agency interpretation of delegated authority, not on Congress's underlying implied powers. McCulloch's framework is unchanged; what has changed is how courts review whether agencies have been clearly authorized to exercise a particular slice of Congress's broad implied authority.
• 2010-2025 — Anti-Commandeering and Federal-State Balance: The Supreme Court's anti-commandeering doctrine (New York v. United States, 1992; Printz v. United States, 1997; Murphy v. NCAA, 2018) represents the most significant modern limit on how the federal government can use its McCulloch-derived implied powers: Congress may establish federal programs but may not commandeer state legislatures or executive officials to administer them. This doctrine sits in tension with McCulloch's broad federal authority — the government has the power to act, but must implement its programs through federal officers, not by conscripting state officials. The balance between federal implied power and state anti-commandeering protection continues to define the structure of cooperative federalism programs in healthcare, environmental regulation, and immigration enforcement.