G7 Debt Strains Mount as US Debt Tops $40 Trillion

August 20, 2026 at 07:16 PM2 min

This digest was compiled by AI from multiple sources — links to the originals are below.

U.S. government debt has topped $40 trillion for the first time, pressing major economies to fund ageing populations, climate change and defence. G7 government bond yields have surged to multi-year highs, lifting borrowing costs across advanced economies. Investors are demanding higher returns as AI-related debt issuance adds to a flood of government bonds.

Key Facts

U.S. government debt has topped $40 trillion for the first time.
U.S. 30-year Treasury yields have risen to their highest since 2007.
Japanese borrowing costs are near their highest in three decades.
German yields have jumped to their highest levels since 2011.
Debt is roughly equal to or higher than economic output across the G7 except Germany.

Rising Borrowing Costs

Government bond yields across the G7 have surged following the COVID-19 pandemic and Russia's invasion of Ukraine, as central banks raised interest rates aggressively to tame inflation. Elevated longer-term borrowing costs reflect investor demand for better returns to compensate for the risk of holding sovereign debt. A surge in borrowing by AI hyperscalers is adding pressure, as buyers demand higher returns to keep purchasing the flood of bonds hitting markets. U.S. 30-year Treasury yields have risen to their highest since 2007, prompting government action to contain rising borrowing costs. Japanese borrowing costs are near their highest in three decades, and German yields have jumped to their highest levels since 2011.

Debt Burdens and Maturity Shifts

U.S. government debt has topped $40 trillion for the first time, underscoring pressure on major economies to fund ever-increasing spending demands. Debt is roughly equal to or higher than economic output across the G7 except Germany, Europe's biggest economy. A high debt burden that brings higher borrowing costs risks hurting living standards by constraining spending and capping growth. Many governments have started selling bonds with shorter maturities to mitigate the impact, but they must repay or refinance the debt sooner. Sovereign debt sets the benchmark for borrowing costs for companies and other loans, including household mortgages.