America is now paying more to service its past borrowing than it spends on national defense, and within a generation, interest payments alone will eclipse every other line item in the federal budget.
Story Snapshot
- Interest on the national debt surpassed $1 trillion annually in fiscal 2026, becoming the fastest-growing federal expense and outpacing Medicare by 2028
- The debt burden has reached 99% of GDP in 2025 and will climb to 120% by 2036, driven primarily by compounding interest rather than new spending programs
- By 2056, interest costs are projected to consume 6.9% of GDP and $6.6 trillion yearly, more than the government will spend on Social Security, defense, and all discretionary programs combined
- Unlike past debt spikes tied to wars or recessions, this crisis stems from structural forces where borrowing costs compound faster than economic growth can offset them
The Bill for Yesterday’s Spending Comes Due
The federal government crossed a grim threshold in fiscal 2026 when net interest payments topped $1 trillion for the first time, representing 3.3% of the entire economy. This expense dwarfs what Washington allocates for veterans’ benefits, food assistance, or housing combined.
The Congressional Budget Office’s latest baseline reveals interest costs nearly tripled from $352 billion in 2021 to $970 billion in 2025, a surge driven by twin forces: massive pandemic-era borrowing that pushed debt to 99% of GDP and Federal Reserve rate hikes that made servicing that debt far more expensive.
The Committee for a Responsible Federal Budget warns this expense will double again over the next decade to $2.1 trillion by 2036, consuming 4.6% of GDP.
Interest on US debt is becoming a top driver of future deficits, as the sheer size of past borrowing overwhelms the fiscal outlook https://t.co/vhDqXqtGfg
— Scott Odenbach (@ScottOdenbach) May 3, 2026
What distinguishes this crisis from past deficit scares is its structural permanence. Post-World War II debt peaked at 106% of GDP in 1946 but melted away through economic growth and fiscal discipline. The 1991 interest peak of 3.2% of GDP reversed when Congress and the White House struck budget deals.
Today’s trajectory assumes no recessions, no new wars, and no additional spending beyond current law, yet debt still accelerates toward 120% of GDP by 2036. The American Action Forum calculates interest will grow 106% between 2026 and 2036, then another 538% through 2056, far outstripping the 1.8% to 2.2% GDP growth rates forecasters expect.
How Borrowed Money Eats Future Generations
The math behind the spiral is brutally simple. The Treasury now pays an average interest rate that will rise roughly 0.5 percentage points by 2036, a modest bump that nonetheless translates to $16.2 trillion in additional interest over the decade due to the sheer volume of outstanding debt.
The Bipartisan Policy Center’s Deficit Tracker highlights a critical inflection point approaching by fiscal 2031: the average cost of servicing debt will likely exceed the economy’s growth rate, triggering a self-reinforcing cycle where deficits balloon independently of policy choices. Each dollar borrowed to cover interest requires more borrowing, which generates more interest, ad infinitum.
This compounding effect explains why interest is projected to overtake Medicare spending by 2028, exceed all discretionary spending combined by 2038, and become the single largest federal expenditure by 2048.
The Peter G. Peterson Foundation underscores that lawmakers added $3.4 trillion to deficits through recent legislation like tariffs and the One Big Beautiful Bill Act, worsening an already precarious outlook. Primary deficits, which exclude interest, remain elevated above 50-year averages but shrink relative to total deficits as interest devours an ever-larger share.
Taxpayers fund this expansion not through visible benefit checks but through invisible transfers to bondholders, foreign and domestic, with no infrastructure, no security enhancement, and no social program to show for it.
The Crowding Out Effect Nobody Wants to Acknowledge
Every billion spent on interest is a billion unavailable for roads, research, or readiness. The CBO projects deficits will climb from $1.9 trillion in 2026 to $3.1 trillion by 2036, with interest accounting for the lion’s share of growth. Defense hawks worry that ballooning interest costs will force cuts to military modernization at a time of strategic competition.
Entitlement advocates fear Medicare and Social Security will face rationing as interest crowds out health and retirement spending. The Peterson Foundation warns that future generations will inherit a government that spends more servicing past obligations than investing in their prosperity, a fiscal legacy that undermines American competitiveness and living standards.
Higher government borrowing also ripples through private markets. As the Treasury competes for capital, businesses and households face elevated borrowing costs for mortgages, auto loans, and corporate expansions. The Federal Reserve’s rate hikes, designed to tame inflation, exacerbated debt service costs by raising term premiums and short-term rates simultaneously.
This dynamic squeezes both sides of the ledger: revenues lag due to slower growth, while interest expenses accelerate, widening deficits further. The Committee for a Responsible Federal Budget labels this the “debt spiral,” where fiscal policy loses the ability to stabilize the economy because every countercyclical measure adds fuel to the interest fire.
Why Fiscal Restraint Remains the Only Path Forward
INTEREST ON US DEBT IS BECOMING A TOP DRIVER OF FUTURE DEFICITS, AS THE SHEER SIZE OF PAST BORROWING OVERWHELMS THE FISCAL OUTLOOK
U.S. debt is expected to continue soaring in the coming decades not because of excesses committed by future lawmakers, although that’s certainly… pic.twitter.com/loaOEbFZtv
— FXHedge (@Fxhedgers) May 2, 2026
The consensus among nonpartisan budget analysts is unambiguous: without reform, the debt trajectory is unsustainable. The American Action Forum projects that by 2056, interest will reach $6.6 trillion annually and 6.9% of GDP, a level unprecedented in peacetime.
The Bipartisan Policy Center and Peterson Foundation both call for urgent legislative action to rein in primary deficits before interest costs metastasize beyond control. Yet political incentives run counter to fiscal discipline. Spending constituencies resist cuts, tax lobbies oppose revenue increases, and both parties prefer short-term fixes to long-term solutions.
The CBO’s baseline incorporates current law, meaning it assumes no future tax cuts or spending hikes, a rosy scenario given recent legislative track records.
Sources:
An Update to the Budget and Economic Outlook: 2026 to 2036 – Congressional Budget Office
Deficit Tracker – Bipartisan Policy Center
Interest Payments on the National Debt: The Near and Long-Term Outlook – American Action Forum
Interest on US debt is becoming a top driver of future deficits – Fortune
