G7 government interest payments hit highest since mid-2008, exceeding $3.3 trillion annually, surpassing AI, defense and clean energy spending

Global debt continues to expand, but at a sharply decelerated pace, as advanced economies face mounting interest costs from years of fiscal expansion.

According to the latest report from the Institute of International Finance (IIF), global debt increased by more than $10 trillion in the first half of 2026, pushing the total to a record high of over $365 trillion. At the same time, average government borrowing costs in the G7 countries have risen to their highest levels since mid-2008. Over the past year, advanced economies paid more than $3.3 trillion in interest on internationally traded government bonds alone.

$3.3 Trillion in Annual Interest: Exceeding AI, Defense, and Clean Energy Spending

The IIF's Global Debt Monitor report reveals that the average government borrowing cost for G7 economies has reached its highest level since mid-2008, with annual interest支出 nearly 85% higher than previous levels. Over the past year, advanced economies paid more than $3.3 trillion in interest on internationally traded government bonds.

This figure surpasses:

• $2.6 trillion – estimated global spending on artificial intelligence
• $3.1 trillion – global defense spending
• $2.3 trillion – global clean energy spending

In other words, the annual interest payments on existing debt by advanced economies alone could cover the entire world's AI investment for a year, with room to spare. This starkly illustrates the fiscal squeeze imposed by rising interest burdens.

New Debt Growth Halved, but Refinancing Costs Locked at High Levels

The IIF report shows that global debt increased by more than $10 trillion in the first half of 2026, bringing the total to over $365 trillion—a new all-time high. However, this increase is less than half of the $21 trillion added during the same period in 2025.

The IIF attributes the slowdown to:

• High interest rate environments
• Rising debt servicing costs
• Higher energy prices
• Conflict with Iran

Emerging markets were the main driver of debt growth during this period, adding $6.5 trillion in the first half of the year and pushing their total debt above $110 trillion. In contrast, debt accumulation in advanced economies slowed markedly.

Government and non-financial corporate sectors contributed the bulk of the increase, with both sectors reaching record debt levels. As old debt matures and is refinanced at higher coupon rates, total interest payments continue to rise—even as the pace of new borrowing slows.

Debt-to-GDP Decline Is an "Inflation Illusion"; Rollover Risks Emerge

Global debt stands at approximately 310% of GDP, down about 25 percentage points from its peak in early 2021. However, the IIF notes that this decline is largely due to inflation boosting nominal GDP, rather than genuine deleveraging.

This means that if inflation subsides and nominal GDP growth slows, the improvement in the debt-to-GDP ratio could quickly reverse. High interest rates are simultaneously raising government refinancing costs and making the debt ratio's decline dependent on inflation—creating a policy dilemma.

According to the IIF report:

• The U.S. 10-year Treasury yield has risen to its highest level since 2007
• The 30-year Treasury yield has reached a nearly two-decade high
• Government refinancing costs are climbing accordingly

While G7 average borrowing costs have returned to levels not seen since mid-2008, global debt has reached a record $365 trillion. Sovereign debt rollover risk is transitioning from a theoretical scenario to a real-world constraint.

For investors holding long-duration sovereign bonds, the line between interest rate risk and credit risk is becoming increasingly blurred—a development that warrants continued attention.

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