What was McCulloch v. Maryland?

McCulloch v. Maryland was an 1819 Supreme Court case establishing federal supremacy over state laws and the doctrine of implied powers under the Necessary and Proper Clause, decided unanimously on March 6, 1819 with Chief Justice John Marshall delivering the opinion of the Court. The case arose from the Second Bank of the United States, chartered by Congress on April 10, 1816 over Republican objections that Congress lacked constitutional authority to charter a national bank. The bank's Baltimore branch made loans on lax terms during the Panic of 1819, and Maryland's General Assembly passed a tax on banknotes issued by banks not chartered by the state.

Maryland aimed the tax squarely at the Bank's Baltimore branch. James William McCulloch, the cashier of the Baltimore branch, refused to pay the tax. Maryland sued McCulloch in state court for the unpaid taxes plus penalties, and Maryland courts ruled for the state. The Bank appealed to the Supreme Court.

The case raised two questions. First, did Congress have the power to charter a national bank, since no enumerated power explicitly authorizes incorporation? Second, could a state tax an instrument of the federal government? Marshall's opinion answered both questions decisively in favor of federal power.

On the first question, Marshall held that the federal government, although limited to enumerated powers, possessed implied powers necessary to effectuate those enumerated powers. He invoked the Necessary and Proper Clause of Article I, Section 8 to support the doctrine: 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. The Bank, although not enumerated, was a reasonable means of executing enumerated powers including taxation, borrowing, regulation of commerce, and management of public lands.

On the second question, Marshall held that the Maryland tax was unconstitutional because the power to tax involves the power to destroy and a state could not be permitted to destroy or impede a legitimate federal instrumentality. The Supremacy Clause of Article VI made federal law supreme over conflicting state laws.

The case had enormous consequences. It validated the doctrine of implied powers that has been used to support a broad range of federal authority including federal regulation of commerce, civil rights legislation, environmental law, and modern administrative agencies. It established the Supremacy Clause as a real check on state interference with federal operations. Marshall's opinion in McCulloch is widely considered one of the greatest in Supreme Court history.

The Bank itself was destroyed by President Andrew Jackson's veto of the Bank's recharter on July 10, 1832 and his transfer of federal deposits in 1833, but the constitutional doctrines from the case have endured.