Power of the Purse in AP US Government

Where the purse sits in the Constitution and in Congress

Three pieces of Article I build this power. Section 8 gives Congress the power to lay and collect taxes and spend for the general welfare. Section 9 requires appropriations by law before money leaves the Treasury. Section 7 says revenue bills have to start in the House, the chamber elected every two years and closest to voters.

That last detail is the version that shows up in Topic 2.2: Structures, Powers, and Functions of Congress, in Unit 2: Interactions Among Branches of Government. The bigger question there is how the different structures of the House and Senate shape lawmaking. The House originates revenue bills, but the Senate can still amend them, so both chambers end up shaping tax policy.

The purse also runs through the budget process. Congress has to pass a budget covering two kinds of spending:

• Mandatory spending is set by existing law and funds entitlements like Social Security, Medicare, and Medicaid. It flows automatically unless Congress changes the underlying law.
• Discretionary spending is approved every year through appropriations bills for things like defense, education, and infrastructure.

Since discretionary money is voted on annually, that's where Congress uses the purse most directly. As entitlement costs grow, the discretionary share shrinks unless taxes go up or the deficit grows. That squeeze is a pattern worth recognizing in a budget chart.

How Congress uses funding to check the executive and the courts

The clearest use is oversight of the bureaucracy, covered in Topic 2.14: Holding the Bureaucracy Accountable. Congress can appropriate money to an agency or hold it back, and it can attach conditions to funding through rider amendments. An agency that ignores what lawmakers intended risks a smaller budget next year, which is a strong incentive to carry out laws as written.

The Budget and Impoundment Control Act (1974) is a good example here. It came after President Nixon refused to spend money Congress had appropriated. The act created the House and Senate Budget Committees and the Congressional Budget Office, and it limited the president's ability to impound (refuse to spend) funds. In effect, Congress reinforced its own control over the purse.

The connection to Topic 2.11: Checks on the Judicial Branch is real but narrower. Congress can pass new laws that change the effects of a Supreme Court ruling, including rulings about taxes. A constitutional amendment is a separate check, since Congress proposes it and the states ratify it.

The Sixteenth Amendment shows that second check at work. In Pollock v. Farmers' Loan & Trust Co. (1895), the Court struck down a federal income tax. Congress later proposed the Sixteenth Amendment, and the states ratified it in 1913. That overcame the effect of Pollock on federal taxation of income and widened Congress's taxing power at the same time.

Funding isn't a direct lever over justices, though. Article III bars Congress from cutting a federal judge's salary while they're in office.

Mix-ups that cost points with the purse

The most common wrong answer hands the power of the purse to the president. The president proposes a budget, and agencies spend money, but only Congress taxes and appropriates. If a multiple-choice stem asks how Congress can use funding to respond to a president or an agency, look for appropriating, withholding, or conditioning funds.

A second error stretches the origination rule. The Constitution requires that revenue bills start in the House. It doesn't say all spending bills must, and it doesn't stop the Senate from amending revenue bills.

A third error treats all spending as up for a vote each year. Congress can't simply skip Social Security payments in an annual appropriations bill. That spending is mandatory until the law creating it is changed.

Writing the purse into a Concept Application or Argument Essay

On Question 1 (Concept Application), a typical scenario describes Congress cutting an agency's budget, attaching conditions to a spending bill, or clashing with the president over appropriations. A strong answer names the power of the purse, ties it to the specific branch being checked, and explains the effect (the agency changes course, the program shrinks, the president negotiates). Saying "Congress has power" without the mechanism won't earn the explanation point.

On Question 4 (Argument Essay), the power of the purse works as specific evidence in prompts about separation of powers or whether Congress can rein in the executive. It pairs well with the principle in Federalist 51, a required document, that each branch needs the means to resist the others. The 1974 Impoundment Control Act is a concrete example for showing that check in action. For the rebuttal, you can point out that mandatory spending and growing entitlement costs limit how much of the budget Congress actually controls year to year.

In the multiple-choice section, look for the purse in budget pie charts or spending-over-time graphs, where you'd need to tell mandatory from discretionary spending and explain what the trend means for congressional control.