Global Debt Hits $365 Trillion as Interest Costs Outpace AI and Defense Spending

Key points

• Global debt increased by $10 trillion in the first half of 2026, reaching a record $365 trillion, according to the Institute of International Finance (IIF).
• Advanced economies paid over $3.3 trillion in interest on government bonds last year, exceeding global spending on AI ($2.6 trillion), defense ($3.1 trillion), and clean energy ($2.3 trillion).
• The IIF warns that the U.S., Japan, France, and the U.K. face 'persistently large deficits and rising interest expenses,' a pattern previously associated with debt-distressed emerging markets.
• IMF chief Kristalina Georgieva stated that global shocks are 'pushing debt levels up like a staircase not to heaven,' urging governments to prioritize fiscal consolidation and central banks to maintain price stability.
• The OECD noted that 30-year government bond yields are at their highest in 15 years or more in six G7 economies, increasing borrowing costs for governments, businesses, and households.

Background

This development follows a series of warnings in 2026 regarding rising debt sustainability. In August, Japan’s yield curve steepened significantly, signaling deep global debt strain. In September, the U.S. federal debt hit $40 trillion, with interest payments expected to exceed $1 trillion. Global investors have also reassessed U.S. assets due to mounting debt and sanctions, raising doubts about the dollar’s status as a safe haven.

How outlets are covering it

The IIF emphasizes the political 'vicious cycle' where short-term electoral pressures prevent long-term fiscal consolidation, leading to diminishing returns on higher debt. The OECD focuses on the immediate risk of rising bond yields, noting that 30-year yields are at 15-year highs in six G7 economies, which strains budgets and increases borrowing costs for the private sector. The IMF highlights the structural nature of the problem, describing debt levels as rising like a 'staircase' due to successive shocks, and stresses the need for 'courage' to implement difficult reforms. All three bodies agree that advanced economies are now facing risks previously associated with emerging markets, but they differ in emphasis: the IIF points to political failure, the OECD to market pricing, and the IMF to structural fiscal imbalances.

Why it matters

Rising debt service costs crowd out spending on critical areas like AI, defense, and clean energy, potentially slowing global growth and innovation. If governments fail to consolidate fiscal policy, the 'vicious cycle' of rising interest expenses could lead to a debt crisis in advanced economies, with spillover effects on global financial stability and low-income countries that rely on development assistance.

What to watch

Governments are expected to face pressure to implement fiscal consolidation and structural reforms, including changes to public pensions and fuel subsidies, to free up funds for debt reduction. The OECD and IMF will likely monitor the impact of rising bond yields on global growth and inflation, particularly in the context of the Middle East conflict and El Niño weather patterns. The U.S. and other major economies may need to adjust their fiscal policies to address rising interest costs and maintain debt sustainability.