US Federal Budget Structure: Where Citizens’ Taxes Go
US Federal Budget Structure: Where Citizens' Taxes Go — 2025 Analysis
The federal budget is the most comprehensive expression of national priorities. In fiscal year 2023 (the most recently finalized full-year data), the US government spent $6.16 trillion while collecting $4.47 trillion in revenue, leaving a deficit of $1.69 trillion. This analysis examines every major spending category, explains the structural forces behind the numbers, and puts them in context for any reader who pays federal taxes.
Revenue: Where the Money Comes From
Federal revenues in FY2023 totalled $4,447 billion. Over 85% comes from taxes levied directly on individuals — either as income tax or as payroll contributions funding Social Security and Medicare. Corporate taxes, customs duties and excise taxes make up the remainder.
Progressive rate structure. Top 10% of earners pay ~76% of all income taxes.
6.2% SS + 1.45% Medicare, split equally between employer and employee.
Down 9.7% YoY; reflects base erosion and profit-shifting dynamics.
Trade tariffs, including Section 301 duties on Chinese imports.
Fuel, tobacco, alcohol, and aviation taxes earmarked for trust funds.
Federal Reserve remittances, user fees, estate taxes, and miscellaneous receipts.
Federal Spending Allocation, FY2023
The table below shows all 11 major spending categories. Use the toolbar to search, filter by spending type, adjust the visible rows, or switch between dollar values and share of total outlays.
Total federal outlays (FY2023): $6,163 billion. Share (%) = category amount ÷ $6,163B × 100.
| # | Category | Type | Amount ↕ | YoY ↕ | % Budget |
|---|---|---|---|---|---|
| 1 | Social Security | Mandatory | $1,354B | +8.3% | 22.0% |
| 2 | Medicare | Mandatory | $848B | +5.2% | 13.8% |
| 3 | National Defense | Discretionary | $816B | +3.4% | 13.2% |
| 4 | Income Security | Mandatory | $802B | −14.8% | 13.0% |
| 5 | Net Interest on Debt | Interest | $659B | +34.8% | 10.7% |
| 6 | Medicaid & CHIP | Mandatory | $608B | +9.7% | 9.9% |
| 7 | Education | Discretionary | $309B | +7.6% | 5.0% |
| 8 | Veterans' Benefits & Services | Discretionary | $308B | +10.4% | 5.0% |
| 9 | Other Mandatory Programs | Mandatory | $192B | −2.3% | 3.1% |
| 10 | Other Non-Defense Discretionary | Discretionary | $141B | +2.1% | 2.3% |
| 11 | Transportation & Infrastructure | Discretionary | $126B | +14.5% | 2.0% |
| Total federal outlays, FY2023 | $6,163B | 100% | |||
Sources: Congressional Budget Office, US Treasury Fiscal Data, OMB Historical Tables. Values in current USD billions; rounded. Last updated: FY2023 actuals (published 2024). YoY compares FY2022 to FY2023.
Chart 1. Spending by Category
The horizontal bar chart below shows all 11 spending categories in descending order. Social Security and Medicare combined represent more than a third of the entire federal budget; net interest — the fastest-growing item — now rivals the defense budget and is rising much faster.
Values in USD billions, FY2023 actuals. Bars colored by category type: blue = Mandatory, green = Discretionary, red = Interest.
Chart 2. Mandatory vs Discretionary vs Interest
Three-way split of federal outlays. Mandatory spending has grown from 45% of the budget in 1980 to 61% today. Discretionary spending — the part Congress actively votes on each year — has shrunk correspondingly, leaving policymakers with less effective control over the budget's trajectory.
Outer ring: FY2023 actual split. Inner ring: FY1980 for comparison. Source: OMB Historical Tables.
Where Each Dollar of Federal Tax Goes
For a taxpayer who pays $10,000 in total federal taxes (income tax + payroll), the approximate allocation across spending categories based on FY2023 data is shown below.
Adds to 100¢. Since the government borrows ~27 cents per dollar of spending (the deficit), a portion of future taxes is committed to repaying today's spending. The 11¢ for net interest is already the cost of past borrowing.
Methodology
This analysis consolidates official US government budget data into 11 functional categories, following the OMB's Budget of the United States functional classification with minor adjustments for clarity.
Limitations and caveats
- No inflation adjustment: Comparisons across years should account for CPI changes. FY2023 CPI was elevated, so real spending growth was lower than nominal figures suggest.
- Transfers to states: Medicaid, education grants and transportation block grants flow through states, so the federal line-item does not capture where funds ultimately reach citizens.
- "Other Mandatory" and "Other Non-Defense Discretionary" are residual categories covering dozens of smaller programs. Consult the OMB Historical Tables for disaggregation.
- Off-budget items: Social Security's Old Age and Disability trust funds are technically "off-budget" but are included here for a complete picture, consistent with CBO practice.
- Forward projections cited in the text (debt ratios, trust fund exhaustion dates) are from CBO's 2024 Long-Term Budget Outlook and may be revised with new macroeconomic assumptions.
Analytical Insights: What the Numbers Actually Tell Us
The single most consequential trend in FY2023: the explosion of interest payments.
Net interest surged 34.8% year-over-year, reaching $659 billion — more than the entire defense budget when measured against non-mandatory discretionary priorities. This reflects both the rapid rise in Fed funds rate from near-zero to 5.25–5.5% and the accumulating stock of debt. At $949 billion in FY2024, interest payments now represent the second-largest single line item after Social Security. Unlike all other categories, interest costs cannot be legislated away: they compound automatically as long as the deficit persists.
Insight 1 — Healthcare is the budget's structural core
Medicare ($848B), Medicaid & CHIP ($608B) and health-related income security programs collectively exceed $1.5 trillion — nearly one quarter of total federal outlays. These programs are driven by three forces that do not reverse easily: an aging population (the 65+ cohort is growing at roughly 3% per year), rising per-beneficiary costs in a healthcare system where prices consistently outpace general inflation, and expanded eligibility that followed the ACA. The Medicare hospital trust fund faces insolvency by 2036 without legislative changes; the Social Security combined trust fund by 2035. These are not distant horizons — they fall within the horizon of ordinary budget planning.
Insight 2 — Post-pandemic normalization masked underlying trends
The headline FY2023 spending decline of 8% compared to FY2022 reflects the unwinding of emergency programs (expanded Child Tax Credits, rental assistance, COVID-era Medicaid enrolment protections) rather than any genuine fiscal consolidation. Income Security spending dropped 14.8% year-over-year precisely because pandemic transfer payments expired — not because the underlying eligible population shrank. Strip out the pandemic distortions and the structural budget trajectory is one of sustained primary deficits driven by healthcare and interest costs, with defense and non-defense discretionary spending declining as a share of GDP.
Insight 3 — Defence spending is historically moderate relative to GDP
At $816 billion (3.0% of GDP in FY2023), US defense spending is large in absolute terms but lower relative to GDP than at any point during the Cold War (when it reached 9–10% of GDP). The challenge is not the defense budget in isolation but its competition with mandatory programs and interest for a share of total outlays. In dollar terms, defense spending has grown steadily but as a fraction of the budget has declined from over 25% in the 1970s to 13% today.
Insight 4 — Revenue fell even as spending remained elevated
Federal revenues dropped 9% in FY2023 (to $4.47T from $4.9T in FY2022), largely because capital gains realizations and corporate profits — both highly sensitive to market conditions — fell sharply after the equity market correction. This asymmetry — revenues cyclically volatile, mandatory spending structurally rising — is a core driver of deficit persistence. It also means revenue projections based on peak-year collections overstate the sustainable fiscal position.
The compounding dynamic: A $1.69 trillion deficit in FY2023 added to a $32+ trillion debt stock. Interest payments on that stock grew 34.8%. The resulting higher interest payments will themselves add to future deficits, requiring either larger borrowing or cuts to other programs. CBO projects the debt-to-GDP ratio reaching 116% by 2034 under current law — a level with no precedent in US peacetime history.
What This Means for You
For a typical employed American, the federal budget is not an abstract document — it determines the value and stability of the programs your taxes fund, the trajectory of the national debt that future generations will service, and the fiscal space available for investment in things that grow the economy.
If you are a working taxpayer (under 65)
The majority of your federal tax dollar — roughly 47 cents of every dollar combining income and payroll taxes — goes to Social Security and Medicare, programs you will not draw on for decades. This is not necessarily a problem: these are largely pay-as-you-go social insurance systems backed by trust funds. The risk is that trust fund depletion triggers automatic benefit cuts (projected at ~23% for Social Security) before legislative fixes are enacted. Your payroll contributions are currently supporting existing beneficiaries, not accumulating a personal account.
If you are approaching or in retirement (65+)
Social Security and Medicare are the most significant financial commitments the federal government makes to you. Both face solvency questions within the next decade. Reforms — whether through premium adjustments, means-testing enhancements, payroll tax changes, or benefit-formula revisions — are increasingly likely. The political calculus makes large immediate cuts improbable, but gradual adjustments are highly plausible in any bipartisan fiscal deal. Understanding the trust fund mechanics helps you plan appropriately.
If you care about economic growth and public investment
The compression of discretionary spending (now only 26% of the budget) means that areas most directly linked to long-run productivity — R&D, infrastructure, education — are in structural decline as a share of GDP. Transportation and infrastructure represent just 2 cents per dollar of federal spending despite the IIJA boost. As mandatory spending and interest costs continue crowding out discretionary priorities, the federal government is progressively transforming from an investor in the future into a transfer-payment system with a large interest burden.
If you are a business or investor
Persistent deficits of 5–7% of GDP in a non-recessionary environment are historically unusual for advanced economies. The combination of high nominal interest rates and large Treasury supply creates a structurally elevated risk-free rate, raising the cost of capital for private investment. The CBO's projection of 116% debt-to-GDP by 2034 implies continued large Treasury issuance, reinforcing upward pressure on the term premium in bond markets.
Frequently Asked Questions
Primary Data Sources
All data in this article derive from official US government and nonpartisan policy sources. Values are lightly rounded for readability; for formal statistical or policy work, always consult the original databases.
Article by StatRanker · Data: FY2023 actuals · Published 2025.
