Flast v. Cohen, 392 U.S. 83 (1968), is the Supreme Court decision that lets a federal taxpayer sue the government over how it spends money, but only in a narrow set of cases. The Court held that taxpayer status alone can support standing when the lawsuit challenges a congressional spending program and alleges that the program violates a specific constitutional limit on the taxing and spending power. In practice, that has meant Establishment Clause challenges to federal appropriations that support religion. Chief Justice Warren wrote for the majority; Justice Harlan dissented. The case has never been overruled, but later rulings have shrunk the exception to something close to a keyhole.
The Default Rule Flast Carved Into
For more than forty years before Flast, the governing case was Frothingham v. Mellon (1923). A taxpayer had tried to block enforcement of the Maternity Act, which appropriated federal money to reduce infant mortality. The Supreme Court refused to hear it, reasoning that any one taxpayer’s interest in the federal treasury “is shared with millions of others; is comparatively minute and indeterminable, and the effect upon future taxation, of any payment out of the funds, so remote, fluctuating and uncertain, that no basis is afforded for an appeal to the preventive powers of a court of equity.”1Justia. Commonwealth of Massachusetts v. Mellon
The logic behind that rule is basic to federal jurisdiction. Article III courts hear “cases or controversies,” not general policy complaints.2Constitution Annotated. ArtIII.S2.C1.6.1 Overview of Standing If every taxpayer could sue over every expenditure, judges would end up running the federal budget. Standing keeps courtrooms focused on people with a concrete personal stake.
What Happened in Flast
Florence Flast and six other federal taxpayers sued Wilbur Cohen, then Secretary of Health, Education, and Welfare. They alleged that federal money was being spent under the Elementary and Secondary Education Act of 1965 to finance instruction and buy textbooks and instructional materials for use in religious schools.3Justia. Flast v. Cohen Their claim: Congress was using tax dollars to support sectarian education in violation of the First Amendment.
The lower court dismissed on Frothingham grounds, treating it as an absolute bar. The Supreme Court reversed. Frothingham, the Court said, was not a blanket prohibition. It described the ordinary difficulty a taxpayer faces in showing a personal stake, and left room for cases where the taxpayer’s connection to the spending is tight enough to matter.
The Two-Part Nexus Test
Flast set out a framework with two requirements. Both have to be met before taxpayer status alone will get a plaintiff into federal court.
First, the challenge must attack an exercise of Congress’s taxing and spending power. A statute that is primarily regulatory, with spending only incidental to it, will not do.3Justia. Flast v. Cohen
Second, the taxpayer must tie the challenge to a specific constitutional limit on that spending power. Arguing that Congress lacked general authority under Article I is not enough. The plaintiff has to point to a constitutional provision that operates as a direct restriction on how federal money can be spent.4Library of Congress. Flast v. Cohen
The difference matters. A structural argument about the scope of congressional power is the kind of generalized grievance any citizen could raise. A claim that Congress crossed a constitutional boundary specifically drawn around the government’s wallet gives the taxpayer a personal stake in the outcome.
Why the Establishment Clause Fits and Most Rights Don’t
The Court identified the Establishment Clause as the constitutional provision that satisfied the second prong. The Framers wrote it against a historical backdrop that included compulsory taxation to support churches and clergy, and the Clause is aimed squarely at government use of tax revenue to support religion. A taxpayer challenging appropriations that benefit religious institutions is invoking a constitutional limit tailored to protect them in that role.
Other constitutional rights don’t work the same way. Free speech, due process, and equal protection restrict how the government regulates people. They aren’t focused on the power of the purse. That is why the Flast exception has stayed narrow: it rests on a historical link between the Establishment Clause and taxpayer money that other provisions can’t replicate.
What Flast Does Not Reach
Later decisions have drawn tight boundaries around the exception. Reading them together is the fastest way to see what Flast will and will not do today.
Executive Branch Property Decisions
In Valley Forge Christian College v. Americans United (1982), taxpayers challenged the transfer of surplus federal property to a religious college. The Supreme Court held they had no standing. The transfer was an executive branch decision made under the Property Clause, not an exercise of the taxing and spending power, so the Flast framework did not apply.5Justia U.S. Supreme Court Center. Valley Forge Coll. v. Americans United
Executive Discretionary Spending
In Hein v. Freedom From Religion Foundation (2007), taxpayers challenged conferences run by the White House Office of Faith-Based and Community Initiatives, which they said promoted religion. The money came from general executive appropriations, not from any statute directing funds toward the challenged activity. The Court held Flast did not apply because the spending “was not expressly authorized or mandated by any specific congressional enactment” and the lawsuit was “not directed at an exercise of congressional power.”6Justia. Hein v. Freedom From Religion Foundation, Inc. When the executive branch decides on its own to spend general appropriations, taxpayers cannot use Flast to sue, even if the spending raises real Establishment Clause concerns.
Tax Credits
Arizona Christian School Tuition Organization v. Winn (2011) closed off another route. Arizona offered tax credits to individuals who donated to organizations that funded private school scholarships, including at religious schools. Taxpayers argued the scheme funneled public money into sectarian education. The Supreme Court disagreed. A tax credit is not a government expenditure. When the government spends, money passes through the treasury, and that is the link Flast recognized. With a credit, the money never enters the treasury; the taxpayer just keeps more of their own income. No treasury disbursement, no Flast standing.7Justia. Arizona Christian School Tuition Organization v. Winn That distinction shields a large set of programs, because many benefits to religious institutions run through the tax code rather than through appropriations.
State Taxpayers in Federal Court
Flast is about federal taxpayers and federal spending. In DaimlerChrysler Corp. v. Cuno (2006), the Supreme Court held that state taxpayers have no Article III standing in federal court to challenge state tax or spending decisions on the basis of their taxpayer status alone. The Frothingham reasoning, the Court said, “applies with undiminished force to state taxpayers.”8Justia U.S. Supreme Court Center. DaimlerChrysler Corp. v. Cuno State courts often apply more permissive standing rules under their own constitutions, so a state-level challenge may still be possible in state court, but the Flast exception does not carry over.
Where the Door Is Still Open: Grant Programs
Bowen v. Kendrick (1988) is the clearest example of Flast working as intended. Taxpayers challenged the Adolescent Family Life Act, arguing Congress was directing grants to religiously affiliated organizations in violation of the Establishment Clause. The government argued the constitutional problem, if any, was in how executive officials chose grantees, not in the statute itself. The Court rejected that framing. Because the taxpayers were challenging a congressionally authorized spending program on Establishment Clause grounds, both prongs of Flast were satisfied. Executive officials making individual grant decisions did not break the link back to congressional spending.9Justia U.S. Supreme Court Center. Bowen v. Kendrick
The Practical Bottom Line
Flast v. Cohen is still on the books, but taxpayer standing under it now depends on a specific combination of facts. The challenge has to target a spending program authorized by a specific act of Congress. The money has to flow from the federal treasury. And the alleged violation has to be of the Establishment Clause. Executive branch discretionary spending, property transfers, tax credits, and state-level fiscal decisions all fall outside. The cases where Flast actually delivers standing today tend to look like Bowen: Congress creates a grant program, federal money reaches religious organizations or activities through it, and a taxpayer argues the program crosses the line between church and state.