Suffocating Debt: Wealthy Nations Enter a Vicious Cycle
The sovereign bond markets of advanced economies are sounding an alarm. Governments are now forced to pay higher interest rates as both debt levels and budget deficits reach extremely high levels.
The most visible pressure is in the United States. The 10-year US Treasury yield breached 5% on Monday (14/09/2026), reaching its highest level since 2007. This rise is not isolated to the US; government bond yields in the UK, France, Germany, and Japan are also continuing to climb.
According to The Economist, the median 10-year government bond yield in advanced economies is now approaching 4%. This figure is the highest in over 15 years and is nearly five times the average seen between 2015 and 2021. Rising yields force governments to offer higher interest rates to entice investors to purchase their bonds, even as government funding requirements continue to swell.
The gross public debt ratio in advanced nations is now approaching 110% of Gross Domestic Product (GDP), compared to approximately 70% in the early 2000s. During this period, the US debt ratio more than doubled, while the UK’s debt nearly tripled. Budget deficits also remain wide; the US is projected to record a deficit of around 6% of GDP this year, while France’s deficit exceeds 5%.
Conditions have been exacerbated by central banks raising benchmark interest rates. The US Federal Reserve recently raised the Fed Funds Rate by 25 basis points on Wednesday (16/09/2026), following a similar move by the European Central Bank (ECB) a week earlier. During the 2010s, governments could largely ignore debt concerns because interest rates were extremely low. That era of cheap borrowing is now coming to an end.
Large Debt Meets High Interest
Governments have faced high bond yields and large debt piles before. However, in recent decades, these two problems have rarely occurred simultaneously. In 2007, while median yields in advanced economies were at levels similar to today, the debt-to-GDP ratio was only around 11%. This year, that figure is expected to be more than double.
Governments must now find funds to finance deficits while simultaneously refinancing maturing bonds. Consequently, interest burdens are consuming an increasing portion of national budgets. Debt interest payments now account for more than 3% of GDP across OECD member nations. In the US, this figure is approaching 5% of GDP, the highest among G7 members, while Italy follows closely at approximately 4%.
These costs are poised to grow further. Much of the current outstanding debt was issued when interest rates were very low. As these bonds mature, governments must replace them with new debt at much higher rates. The Committee for a Responsible Federal Budget estimates that annual US interest payments could surge nearly threefold to US$2.7 trillion by the end of the decade if borrowing costs remain at current levels—a figure larger than the US government’s budget for Medicare or Social Security.
Investors Demanding Higher Returns
While short-term bond yields typically follow market expectations regarding central bank interest rate paths, investor considerations become more complex for long-term lending. Investors must account for inflation risks, budget deficit trajectories, and the future ability of governments to service their debt. These risks lead investors to demand a higher ‘term premium’.
The OECD estimates that the average term premium by the end of 2025 has increased by more than one percentage point compared to pre-pandemic levels. This rise continued throughout 2026. In the US, the term premium is estimated to have reached its highest level in over a decade.
The unique appeal of US Treasuries is also diminishing. For years, investors accepted lower rates because US government bonds were considered exceptionally safe and liquid—a benefit known as ‘convenience yield’. Analysis by Lira Mota from MIT, updated by Hanno Lustig from Stanford University, shows that the convenience yield for US Treasuries nearly vanished in July 2026. The loss of this advantage poses a significant challenge for the US, which must find trillions of dollars in funding from bond markets annually.
Governments Competing with AI Projects
Governments are also competing for capital against rising private sector investment needs. The construction of data centres, semiconductor fabrication plants, power grids, and various artificial intelligence infrastructure projects requires trillions of dollars. These projects offer alternative options for investors who previously allocated funds to government bonds.
Simultaneously, several major buyers of government bonds are retreating. Central banks, which for years purchased bonds to prevent deflation, are now reducing their holdings. Furthermore, defined-benefit pension schemes are gradually being replaced by defined-contribution schemes, which tend to allocate more funds toward equities and other riskier assets. Serdar Celik, Head of the OECD Capital Markets Unit, noted that current bond buyers are more price-sensitive, only willing to purchase if governments offer sufficient returns.