The three buckets of federal spending
Each year the federal government spends trillions of dollars, and budget analysts typically sort that spending into three categories. Mandatory spending covers programs whose payouts are set by existing law, including Social Security, Medicare, and Medicaid. Discretionary spending is the portion Congress sets annually through appropriations bills, covering things like defense, education, transportation, and scientific research. The third bucket is interest paid to holders of U.S. Treasury debt.
Where most of the money goes
A relatively small number of categories account for the bulk of the federal budget. Health programs (chiefly Medicare and Medicaid), Social Security, national defense, and interest on the national debt together make up the large majority of annual outlays. Everything else — from federal courts and national parks to foreign aid, housing assistance, and farm programs — fits into the remainder.
Who checks the books
Several offices are tasked with examining how money is spent. The Government Accountability Office, an independent arm of Congress, audits agencies and publishes reports on performance, mismanagement, and improper payments. Each major agency also has an inspector general who investigates waste, fraud, and abuse inside that department. The Congressional Budget Office provides nonpartisan cost estimates and budget projections, and the Office of Management and Budget oversees spending from inside the executive branch.
What "waste" usually means
In federal reports, "waste, fraud, and abuse" generally refers to things like improper payments, duplicative programs, contracts that exceed their value, or benefits paid to ineligible recipients. The GAO publishes a recurring list of programs at high risk for such problems. Even when audits identify large dollar figures, those amounts are typically a fraction of total spending, and reasonable people disagree about how much is realistically recoverable.
Why the debate often centers on a small slice
Because mandatory programs and defense dominate the budget, political fights over "cutting waste" often focus on smaller discretionary line items, such as specific grants, agencies, or earmarks. Critics argue that scrutinizing small programs is worthwhile because savings add up and signal accountability. Others counter that meaningful change to long-term spending requires addressing the largest categories, which is politically difficult because they include popular benefits and core government functions.
Competing views on "wise" spending
There is no neutral formula for what counts as wise spending; it depends on what a voter values. Some Americans prioritize lower taxes and a smaller federal footprint, viewing many programs as inefficient or beyond the government's proper role. Others see federal spending on health care, retirement, infrastructure, or defense as essential investments and worry more about underfunding than overspending. Still others focus less on the total and more on whether specific dollars are managed competently.
How to look at the numbers yourself
The Treasury Department's USAspending.gov, the CBO's annual budget outlook, and GAO and inspector general reports are all publicly available. They allow voters to see how much is spent in each category, how spending has changed over time, and what auditors have flagged. Reading these sources alongside one another can help separate the size of a program from questions about how well it is run.