The $40 Trillion U.S. Debt Milestone Is Raising Global Borrowing Costs—But Is a Credit Crisis Next?

United States: a larger debt stock and a rising interest burden

Treasury data put total U.S. public debt at about $40.05 trillion, up from $19.4 trillion a decade earlier. The figure includes debt held by the public as well as intragovernmental holdings; roughly $32.27 trillion was held by the public and other private investors, while about $7.78 trillion was held within the government.

The central concern is not that the United States suddenly became unable to borrow. Treasuries remain a major global safe asset. The concern is that persistent deficits require a continuing supply of bonds, and that new debt must be issued at higher rates than during the low-interest-rate era.

That creates a potentially self-reinforcing cycle:

1. Large deficits require more Treasury issuance.
2. Investors demand higher yields to absorb additional supply and compensate for inflation or fiscal uncertainty.
3. Higher yields increase the government’s interest expense as existing debt is refinanced.
4. Larger interest costs widen future deficits unless spending falls or revenues rise.

This process normally builds gradually rather than producing an overnight crisis. But it reduces fiscal flexibility: governments have less room to respond to recessions, wars or financial shocks without borrowing even more.

Japan: weaker demand for Treasuries, but no wholesale exit

Japan remains the largest foreign holder of U.S. Treasuries, but its holdings fell to $1.116 trillion in June from $1.143 trillion in May, a decline of about $26.4 billion. Japanese investors also recorded net sales of $29.6 billion in U.S. government, agency and local-authority debt during the first quarter.

A reduction in Japanese demand can add pressure to Treasury markets because Japan is an important source of international capital. However, one month of lower holdings—or a quarter of net sales—does not demonstrate a wholesale retreat from U.S. government debt. Japan’s remaining holdings are still substantial, and the data do not establish that Japanese selling is the dominant cause of the global bond sell-off.

Japan is facing its own repricing. Its 10-year government bond yield approached 3%, a three-decade high, as investors adjusted to inflation and changing interest-rate expectations.

Germany: more borrowing can mean more safe-asset supply

Germany’s borrowing costs have risen even though German government bonds remain a benchmark for euro-area safety. The 10-year German yield reached 3.2138%, its highest level since 2011, according to LSEG data cited by The Guardian.

Part of the pressure reflects the broader global rise in yields. Germany’s plans for increased defence and investment spending also imply more issuance. That spending may support economic activity, but it adds to the supply of highly rated government bonds at a time when investors are already reassessing how much sovereign debt the market can absorb.

The policy trade-off is increasingly difficult: fiscal expansion can cushion weak growth, while higher borrowing costs make that support more expensive and constrain future budgets.

United Kingdom: debt near £3 trillion and shrinking fiscal room

The UK’s public-sector debt remained just below £3 trillion at the end of July 2026. The Office for National Statistics reported £1.8 billion of public-sector borrowing in July, £700 million more than in the same month a year earlier and £2.3 billion above the Office for Budget Responsibility’s forecast.

Borrowing for the first four months of the 2026–27 financial year reached £56.7 billion. Separate reporting said social-benefit spending was £2 billion higher than a year earlier in July.

The pressure is compounded by debt-service costs. HM Treasury said debt-servicing costs exceeded £100 billion in both 2023–24 and 2024–25—equivalent to about £1 in every £10 of public-sector spending. That spending does not automatically indicate imminent market loss of confidence, but it shows why higher gilt yields can quickly narrow Britain’s fiscal headroom.

France: the clearest European political-fiscal vulnerability

France faces a more country-specific risk than Germany because high debt and political fragmentation make deficit reduction harder to execute. Its public debt is roughly €3.5 trillion, and interest costs are projected to approach €100 billion by 2029.

French 10-year yields have moved close to 4%, while interest payments in the first half of the year rose 19% from the same period a year earlier, reaching €34.5 billion.

The danger is a “snowball effect”: if the average interest rate on government debt remains above economic growth, debt can rise relative to the economy even without a new spending shock. Investors are therefore charging France a higher premium than other major euro-area sovereigns.

That is a serious credibility and refinancing problem, but it is not the same as a generalized euro-area funding freeze. France remains the key political and fiscal tail risk in the current market repricing.

Why refinancing matters now

Governments issued substantial debt during the era of exceptionally low interest rates. As those bonds mature, they must be replaced with new debt carrying today’s higher coupons. The adjustment is gradual, but each refinancing cycle can raise the average interest cost of the debt stock.

Higher energy prices make the problem more difficult. If an energy shock keeps inflation elevated, central banks may have less room to cut interest rates. That leaves governments refinancing at higher rates for longer and can also weaken growth, reducing tax revenues.

The same mechanism affects companies and households. Government bonds are a reference point for private borrowing, so higher sovereign yields can raise financing costs throughout the economy and discourage investment.

Is a global sovereign-debt crisis imminent?

The evidence supports a warning about prolonged financial pressure, not a conclusion that a global credit crisis has already begun. Sovereign crises generally depend on whether a government can continue financing itself, not simply on whether its debt has crossed a particular threshold.

Europe also has institutional protections that were not available in the same form during the 2010–12 crisis. Analysts have pointed to the eurozone’s safety net as an important reason that higher yields do not automatically imply sovereign default or a systemic funding break.

The more plausible near-term outcome is a less dramatic but economically important one: higher long-term yields, rising debt-interest bills, reduced fiscal room and weaker growth. The $40 trillion U.S. debt milestone adds to that pressure by highlighting the scale of future Treasury supply, while the bond-market response shows that investors are increasingly differentiating between governments with stronger and weaker fiscal credibility.