Global debt hits a record as the IMF warns on interest costs

The world now owes a record US$365 trillion, according to the Institute of International Finance, with China and the United States leading the borrowing¹. Debt climbed US$10 trillion in six months¹. Quartz and CNBC reported the same total as bond yields hit multi-year highs^2,3.

The International Monetary Fund issued a matching warning. Its 2026 Annual Report said government interest payments worldwide have risen⁶, and the fund warned that higher debt and interest costs are limiting governments’ room to invest and build resilience⁷. IMF Managing Director Kristalina Georgieva told the BBC that economic shocks had pushed debt levels up “like a staircase not to heaven”⁸. The fund separately warned of rising fiscal pressures and public debt across its membership⁷.

Why it matters to investors

The link between the two headlines is mechanical. Global debt reached the record as bond yields hit their highest in 15 years², which raises the cost of every rollover in the stock of debt³. The IMF report arrived as Treasury yields hit their highest level since 2007⁶.

CNBC reported economists sounding the alarm over a vicious cycle, and noted that the United States, Japan, France and the United Kingdom are facing challenges typically met by emerging markets³. Interest payments by advanced economies have risen on internationally traded government bonds^2,3.

In the United States the arithmetic is already visible. Gross federal debt has passed $40 trillion, and the co-chairs of the Bipartisan Fiscal Forum urged House leadership to act⁴. Federal spending on interest payments rose by 12% in August alone⁵.

What to watch

Investors with long memories of policy fixes are sceptical of the easy ones. Howard Marks of Oaktree said US borrowing costs need a fiscal fix⁹, identifying persistent inflation, large fiscal deficits, Treasury issuance and strong demand for capital as the forces pushing rates up⁹. He called US fiscal discipline out of control and described buying bonds to suppress yields as a band-aid¹⁰.

That last point is the live one. Coverage of Marks framed the Treasury’s operation twist as failing to convince the market, and listed the deficit, inflation and AI capital demand as the triple pressure driving up long-end rates¹⁰. The question for the months ahead is whether governments can slow the compounding of interest costs before those costs constrain them further^5,7.