Why the US federal budget operates largely on autopilot
In short: When we discuss federal spending, we often focus on what Congress debates annually. However, a massive portion of the US budget bypasses the yearly approval process entirely, driven by permanent laws rather than annual appropriations, leaving much of the nation's fiscal trajectory set by long-standing entitlement programs.
The US federal budget is divided into two primary categories: discretionary and mandatory spending. Discretionary spending requires Congress to approve specific funding levels every year. In 2022, this category accounted for just over a quarter of all federal outlays, covering everything from infrastructure and education to the salaries of federal employees. Within this slice, defense spending represented roughly 45 percent, or $750 billion, while non-defense outlays comprised about 55%, or $910 billion.
In contrast, mandatory spending—often referred to as entitlement spending—functions on 'autopilot.' Programs such as Social Security, Medicare, and Medicaid do not require annual congressional approval; instead, the government is legally obligated to provide benefits to anyone who meets the eligibility criteria. This category is significantly larger, representing approximately two-thirds of all federal spending. The remaining portion of the budget, roughly 8 percent as of 2022, is dedicated to paying interest on the federal debt.
The composition of discretionary spending has shifted significantly over the decades. In 1973, discretionary outlays were 9.6 percent of GDP, with 60 percent allocated to defense. By 2022, this had fallen to 6.6 percent of GDP, with defense making up a little under half of that amount. While defense spending has fluctuated with global conflicts—peaking at 9.2 percent of GDP during the Vietnam War in 1968—non-defense discretionary spending has remained relatively stable, generally hovering between 3 and 4 percent of GDP.
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Sources
- Summary by Intellect · source: Discretionary and mandatory outlays of the US federal government | Khan Academy
- Also: Understanding Discretionary Spending in the Federal Budget
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