How has government spending changed over time? — Analysis and context

What we mean by government spending and why it matters

When people ask how government spending has changed, they often mean federal outlays, state and local expenditures, or both. For clarity, federal outlays are the totals the executive branch reports for the national budget and include mandatory programs, discretionary accounts, and interest on the debt; readers can consult the OMB historical tables for official totals and categories Historical Tables, Budget of the United States Government.

These categories matter because changes in the mix of spending affect policy debates differently than changes in raw totals. For example, growth in mandatory programs such as Social Security or Medicare shifts long-term budget pressures in different ways than short-term stimulus spending.

State and local finances use different accounting and responsibility lines than the federal government, which makes direct comparisons tricky. The U.S. Census Bureau’s government finance data explains why states and localities typically show larger shares for education and public services relative to federal accounts Annual Survey of State and Local Government Finances.

In short, credible comparisons require the right sources and consistent units, such as nominal dollars, inflation-adjusted dollars, or shares of GDP. That framing helps voters and readers evaluate spending changes in historical context.

Decade-by-decade federal spending trends: a high-level overview

Federal outlays have increased substantially in nominal terms across recent decades, but the interpretation depends on whether you look at inflation-adjusted values or spending as a share of GDP. The OMB historical tables are the baseline series most analysts use to compare decades and to convert nominal totals into real terms or GDP shares Historical Tables, Budget of the United States Government.

Major inflection points include the growth of entitlement programs in the late 20th century, large fiscal responses to recessions such as the 2008 crisis, and the expansive fiscal measures in the early 2020s. CBO outlooks are useful for showing how those past inflections feed into projected budgets and how different drivers push totals in varying directions The Budget and Economic Outlook: 2024 to 2034.

How mandatory programs and healthcare reshaped the federal budget

Mandatory programs, especially Social Security and Medicare, account for a growing share of federal outlays and explain much of the long-term increase in federal spending, according to OMB historical data Historical Tables, Budget of the United States Government.

Mechanically, mandatory spending rises through eligibility rules, demographic aging, and health-care price growth; these factors combine to push entitlement costs higher even when discretionary spending is stable.

Analysts at the Congressional Budget Office also document that nondefense mandatory spending has risen as a share of the budget while defense’s share has fallen relative to Cold War peaks, which changes where fiscal pressure appears in long-run outlooks The Budget and Economic Outlook: 2024 to 2034.

Readers interested in mandatory spending trends should examine program-level data for Social Security, Medicare, and Medicaid to see how demographic and price drivers operate differently across programs.

Defense and discretionary spending: long-term shifts

Nominal defense spending has grown in many periods, but its share of total federal outlays has declined since the Cold War-era peaks, a pattern highlighted in CBO analyses that compare program shares over time The Budget and Economic Outlook: 2024 to 2034.

Nondefense discretionary accounts have absorbed different priorities as mandatory programs expanded, which often forces trade-offs in budget debates between domestic programs and defense or other discretionary priorities.

It is important to distinguish between level increases, which may reflect inflation or programmatic additions, and share declines, which reflect relative changes across the whole budget.

Interest costs, federal debt, and recent fiscal pressure

Interest payments on the federal debt rose notably in the early 2020s as market interest rates increased, and that rise has been identified as a material contributor to projected deficits in recent CBO outlooks The Budget and Economic Outlook: 2024 to 2034.

Analyses from policy research organizations explain how higher interest costs squeeze the budget by increasing mandatory outlays for debt service and by reducing fiscal space for other priorities Rising Federal Interest Payments and Budget Implications.

When interest costs rise, projected deficits can grow even without new programs or tax changes because more revenue must go to debt service. That dynamic is central to near-term budget conversations and the CBO’s year-to-year outlooks.

State and local government spending: a different profile

State and local budgets differ from the federal budget in both responsibility and composition; Census finance data show that education and local public services typically make up much larger shares of state and local spending than they do at the federal level Annual Survey of State and Local Government Finances.

These differences arise because states and localities fund schools, local roads, police and fire services, and other direct public services, while the federal government focuses more on nationwide programs and transfers.

International context: how the United States compares

Cross-country indicators help place U.S. spending levels and composition in an international frame, with OECD data providing normalized series for general government spending and sector shares such as health and pensions General government spending (indicator).

Those international comparisons show that countries vary in how much they spend on health and pensions, and that composition often reflects demographic patterns and policy choices rather than a single spending logic.

When using OECD or OMB tables for international comparison, normalize by GDP and check population structure to avoid misleading contrasts based purely on headline totals.

How economic cycles and recessions change spending and revenues

Automatic stabilizers such as unemployment insurance and safety-net transfers increase outlays during downturns while tax receipts fall, which produces a countercyclical fiscal response without new legislation in many cases; CBO materials describe these dynamics in budget projections The Budget and Economic Outlook: 2024 to 2034.

Recessions therefore raise certain categories of spending and lower revenues at the same time, which can create sharp but often transitory increases in deficits until recoveries restore tax collections.

Understanding short-term fiscal volatility requires tracking both cyclical components and the underlying structural drivers that determine persistent spending trends.

What polling shows about public trust in government over time

Pew Research Center polling indicates that public trust in government has remained low through the mid-2020s and that trust levels move around major fiscal events and policy controversies, though polling alone does not establish causal links between spending changes and trust Public Trust in Government, 1958-2024.

Polling trends show long-term fluctuations tied to political and economic cycles, and analysts caution that timing correlations do not prove that spending levels directly cause trust shifts.

For voters and readers, the polling record is useful for seeing how public perceptions track with fiscal episodes, but it must be read alongside policy and media contexts to understand the broader drivers of opinion.

Does government spending drive public trust? Limits of the evidence

While timing correlations exist between major fiscal events and changes in trust, the evidence does not establish that spending levels alone drive public trust; CBO and Pew materials underscore that multiple factors shape public opinion and that correlation does not equal causation Public Trust in Government, 1958-2024.

Other plausible influences on trust include political polarization, media coverage, government performance in delivering services, and major nonfiscal crises, which can interact with fiscal issues in complex ways.

Given these limits, commentators and policymakers should use cautious language when linking fiscal metrics to public opinion and avoid attributing opinion changes to single causes.

Common mistakes when reading historical spending data

A frequent error is mixing nominal and real dollars; nominal growth can look large while inflation-adjusted growth is modest, so always check whether a table uses current dollars or is adjusted for inflation with a clear base year, which OMB tables provide Historical Tables, Budget of the United States Government.

Another common mistake is confusing levels with shares: a program can increase in dollars but decline as a share of GDP or the total budget, so check both series before drawing conclusions.

Quick validation checks include verifying the source, the units, and whether series have been seasonally adjusted or combined across different accounting systems.

Practical examples: interpreting three recent episodes

The 2008 financial crisis led to higher deficit figures and policy responses that raised discretionary and certain mandatory outlays; CBO outlooks and OMB tables allow readers to compare pre-crisis and post-crisis levels and shares to see the budgetary impact The Budget and Economic Outlook: 2024 to 2034.

The COVID-19 pandemic prompted large federal responses and support measures in 2020 and 2021, which show up in nominal outlays and in shifts to certain program categories; OMB historical tables and CBO analyses document those changes and the subsequent fiscal implications Historical Tables, Budget of the United States Government.

More recently, the early 2020s rise in market interest rates increased federal interest payments and therefore affected near-term budget outlooks; policy research explains how higher federal interest payments can crowd out other spending priorities in projection scenarios Rising Federal Interest Payments and Budget Implications.

What to watch next: open questions for 2026 and beyond

Key open questions include the durability of interest-rate-driven budget pressures and how persistent higher interest costs will be a factor in future outlooks; readers should monitor CBO outlooks for updates on projected debt service and deficits The Budget and Economic Outlook: 2024 to 2034.

Another question is how state and local finance trends will adapt to post-pandemic demands and whether those governments will face persistent revenue constraints that reshape service delivery, which the Census Bureau’s finance data can illuminate Annual Survey of State and Local Government Finances.

Finally, keep an eye on demographic and health-cost trends that drive mandatory spending and on international comparisons that contextualize U.S. choices, using OECD indicators to compare composition across peers General government spending (indicator).