US Debt at $36 Trillion: The Bond Market Breaks

Key Findings

• The US national debt reached $36.2 trillion in June 2026, with a debt-to-GDP ratio exceeding 127%—a postwar record and surpassing the IMF's 2023 advanced economy average of 112%.
• Federal interest payments are projected to reach $1.16 trillion in FY2026, eclipsing annual defense spending ($912 billion) and rivaling Medicare outlays ($1.3 trillion).
• Foreign holders own approximately $7.8 trillion (21.5%) of US Treasuries, with Japan ($1.16 trillion) and China ($780 billion) as the largest holders as of March 2026.
• The Congressional Budget Office (CBO) forecasts debt rising to $45 trillion by 2033 unless significant fiscal reforms occur, with gross interest payments consuming 3.8% of GDP by 2028.
• A sustained 10-year Treasury yield above 5.5%—last seen in 2000—would likely trigger a bond market crisis, based on historical analogues (UK 1976, Greece 2010) and current federal refinancing needs.

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Debt Overview: Size, Structure, and Trajectory

The US national debt hit $36.2 trillion on June 11, 2026, according to TreasuryDirect data. This figure includes both public debt ($26.9 trillion) and intragovernmental holdings ($9.3 trillion). The debt stands at 127.2% of US GDP, which was $28.5 trillion (Q1 2026, BEA). For comparison, the debt-to-GDP ratio was 106% in 2019 and 120% during the COVID-19 fiscal response in 2020.

Debt has grown by $11.4 trillion since January 2020, reflecting both pandemic stimulus packages and structural deficits. The CBO’s May 2026 Budget and Economic Outlook projects continued expansion, forecasting $45 trillion in gross federal debt by 2033 if current policies persist.

Debt Maturity Profile

As of March 2026, the average maturity of marketable US debt is 71 months (5.9 years, Treasury Quarterly Refunding Statement). Short-term debt (maturities under 3 years) comprises 31% of the total, exposing the US to significant rollover risk if interest rates rise.

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Interest Payments Outpacing Core Spending

Interest on the national debt is now the fastest-growing federal expenditure. Outlays are on course to hit $1.16 trillion for FY2026 (CBO, May 2026), up from $659 billion in FY2023—a 76% increase in three years. Interest costs have overtaken annual defense spending ($912 billion, FY2026 NDAA) and are closing in on Medicare ($1.3 trillion, CMS projections).

This shift in budget composition is unprecedented. In FY2022, interest consumed 8.6% of federal outlays; by FY2026, this ratio is projected to reach 15.2%. If yields on new and refinanced debt increase by just 100 basis points, annual interest costs would rise by an additional $280 billion, according to the CBO.

Budgetary Crowding-Out

Rising debt service compresses fiscal space for discretionary spending and safety net programs. Historically, when interest costs breached 3% of GDP (UK 1976, Greece 2010), investors demanded higher risk premia or external intervention. The US is projected to reach this threshold in 2027.

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Who Holds the Debt: Foreign vs. Domestic Breakdown

Foreign investors hold $7.8 trillion in US Treasuries as of March 2026 (Treasury International Capital, TIC data), down from a peak of $8.4 trillion in 2022. The top foreign holders are:

• Japan: $1.16 trillion
• China: $780 billion
• United Kingdom: $710 billion
• Luxembourg, Switzerland, and Ireland: Each holds over $300 billion

Foreign share of US Treasury debt stands at 21.5%, a decline from 29% in 2015. The remaining $28.4 trillion is held domestically, split between the Federal Reserve ($6.6 trillion), mutual funds, pension funds, banks, and state/local governments.

Shifts in Foreign Demand

China has reduced its holdings by $310 billion since 2019, reflecting diversification, geopolitical tensions, and a desire to insulate from US sanctions risk. Japan remains the largest holder but cut exposure by $90 billion in 2024–2026, driven by yen weakness and rising JGB yields.

Domestic demand remains robust, particularly from US banks and pension funds seeking “safe” collateral. However, the Federal Reserve has been shrinking its balance sheet since mid-2025, reducing its footprint by $900 billion in twelve months and shifting more debt absorption to the private sector.

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International Comparisons: Japan, Italy, and the US

Japan

Japan’s government debt reached 261% of GDP in 2025 (IMF), but the domestic banking system and central bank hold over 80% of the debt. This insulates Japan from currency and refinancing shocks, despite a public debt exceeding $11 trillion. Average JGB yields remain below 1%, reflecting persistent deflation and captive domestic demand.

Italy

Italy’s debt is 141% of GDP ($3.1 trillion, March 2026, Eurostat). Its 10-year bond yield surged to 7.2% during the 2011 Eurozone crisis, forcing the ECB to intervene. Foreign investors held 32% of Italian debt in 2011, amplifying selloff risks. Italy’s relatively shorter average maturity (6.8 years) and reliance on foreign demand made it vulnerable to confidence shocks.

United States

The US combines a high debt-to-GDP ratio with a still-dominant reserve currency and deep capital markets. However, its foreign-held share (21.5%) and modest average maturity create vulnerabilities if foreign appetite wanes or if yields spike. Unlike Japan, the US cannot rely on domestic financial repression; unlike Italy, the US issues debt in its own currency, but the scale of issuance strains even the deepest markets.

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Yield Levels and the Breaking Point

The 10-year Treasury yield serves as the benchmark for US borrowing costs. As of June 2026, the yield stands at 5.32%, up from 3.67% in June 2023 and 1.75% in June 2021 (Federal Reserve H.15 data). The recent surge reflects both Fed tightening (policy rate at 5.5%) and growing supply concerns.

When Does the Market Break?

Historical episodes indicate the breaking point lies where debt sustainability comes into question and rollover risk spikes:

• United Kingdom, 1976: Yields soared above 15% as investors lost confidence, forcing an IMF bailout.
• Greece, 2010: 10-year yields breached 7%; refinancing became impossible without EU/IMF intervention.
• Italy, 2011: Yields above 7% triggered ECB intervention.

For the US, the CBO’s stress scenario (May 2026) models a crisis threshold at a sustained 10-year yield above 5.5%—driven by a combination of Fed QT, foreign selling, and higher inflation risk premia. At that level, annual debt service would exceed $1.4 trillion, or 4.2% of GDP, by 2028.

A rapid rise to 6% or higher would likely prompt forced fiscal consolidation, monetary re-expansion, or regulatory changes to channel more domestic savings into Treasuries.

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Historical Precedents: Lessons from UK 1976 and Greece 2010

UK, 1976

Facing a debt-to-GDP ratio of 74% and persistent deficits, the UK saw sterling collapse and 10-year gilt yields spike to 15.3% in September 1976 (BoE). The government sought an IMF bailout, which imposed spending cuts and raised taxes. Confidence returned only after credible fiscal reforms and monetary stabilization.

Greece, 2010

Greece’s debt-to-GDP ratio hit 146% in early 2010 (Eurostat). As spreads over German bunds soared and 10-year yields passed 7%, markets froze. Greece lost market access, triggering EU and IMF rescue packages totaling €240 billion. Austerity, recession, and partial default followed.

Both cases show that the bond market can lose patience well before technical default. Once interest costs crowd out other spending and confidence erodes, yields spike, liquidity evaporates, and external support becomes necessary.

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US Policy Response Options

Fiscal Adjustment

The CBO estimates that stabilizing debt at 130% of GDP would require a combination of $6.7 trillion in spending cuts and/or tax increases over 10 years. However, political polarization and entitlement growth (Social Security and Medicare) limit room for maneuver.

Monetary Policy

The Federal Reserve could halt or reverse quantitative tightening (QT), or resume large-scale asset purchases (QE) to cap yields. However, this risks reigniting inflation, currently running at 3.9% (May 2026, BLS).

Regulatory Arbitrage

Past crises have seen governments use regulatory incentives or requirements to steer domestic financial institutions toward holding more sovereign debt (e.g., risk-weighted capital rules, liquidity coverage ratios). Such measures could stabilize demand but risk market distortions and crowding out private credit.

Structural Reforms

Addressing long-term drivers—healthcare, pensions, tax code inefficiencies—remains essential. Without reform, “automatic stabilizers” (rising interest costs, mandatory spending) will compound fiscal stress.

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Forward Indicators: Market Signals and Stress Points

Yield Curve and Auction Metrics

Recent Treasury auctions highlight rising tail risk: the May 2026 10-year auction tailed by 4.6 bps, with a bid-to-cover ratio of 2.18, down from 2.43 in early 2025. Weakening demand from primary dealers and foreign central banks signals increasing absorption pressure on domestic investors.

The yield curve remains mildly inverted (2-year at 5.45%, 10-year at 5.32%), reflecting near-term policy uncertainty and long-term fiscal risk.

Credit Default Swaps (CDS)

US 5-year CDS spreads rose to 38 bps in June 2026, up from 15 bps in June 2023 (Markit). While still below crisis levels (Italy 2011: 550 bps), the trend reflects rising default hedging costs and market unease.

Foreign Exchange Reserves

Global central banks’ share of dollar reserves fell to 58.1% in Q1 2026 (IMF COFER), down from 64.6% in 2016, as diversification into gold, euro, and renminbi accelerates. This gradual erosion of “exorbitant privilege” could reduce structural demand for Treasuries.

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Frequently Asked Questions

1. What happens if the US 10-year yield rises above 6%?

A sustained 10-year yield above 6% would likely push annual interest costs above $1.5 trillion by 2028. This would force either aggressive fiscal tightening, renewed Federal Reserve intervention (potentially QE), or regulatory changes to support bond demand. Markets would likely demand a risk premium, raising the probability of disorderly moves.

2. How much US debt is held by foreign investors, and which countries are the largest holders?

As of March 2026, foreign investors hold $7.8 trillion (21.5%) of US Treasuries. Japan is the largest holder at $1.16 trillion, followed by China ($780 billion) and the UK ($710 billion). The foreign share has declined from 29% in 2015, with domestic absorption rising.

3. How does the US debt situation compare to Japan and Italy?

Japan’s debt is much larger as a share of GDP (261%), but over 80% is held domestically, and the Bank of Japan can cap yields through direct purchases. Italy’s debt is 141% of GDP, with a higher foreign share and past vulnerability to market panics. The US sits between these cases: high debt, reserve currency status, but growing foreign skepticism and modest average debt maturity.

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What to Watch

• 10-Year Yield Thresholds: Watch for sustained moves above 5.5% on the 10-year Treasury as a signal of potential market stress or breakdown in confidence.
• Treasury Auction Metrics: Monitor bid-to-cover ratios and foreign participation in primary auctions. A sharp drop below 2.0 or failed auctions would signal acute stress.
• Interest Payments vs. Revenues: If interest outlays exceed 20% of federal revenues (projected for FY2028), fiscal sustainability will come under heightened scrutiny.
• Fed Policy and QT/QE Signals: Any pivot from QT to QE, or new facilities supporting Treasury demand, would indicate official concern about market functioning.
• Foreign Reserve Shifts: Accelerating diversification out of dollar reserves by major central banks (China, Saudi Arabia) would erode structural demand for US debt.
• Fiscal Negotiations: Watch for bipartisan movement on major budget reforms, as ongoing gridlock raises the probability of a market-imposed adjustment.

The US national debt at $36.2 trillion, with a debt-to-GDP ratio at a postwar high, has entered a zone where market confidence cannot be assumed. Structural reforms, credible fiscal consolidation, and vigilance on bond market signals will determine whether the US avoids a disorderly breaking point in the years ahead.