Developing Country Debt Hits Record $9.4tn as Poorest Nations Face 1980s-Era Borrowing Costs

External debt owed by developing countries surged to a record $9.4 trillion in 2025, rising 5.5% in the fastest annual increase in four years, according to the World Bank's International Debt Report. The poorest nations now face average interest rates of 8.2% on new borrowing — the highest since the late 1980s — with the Bank warning that debt service costs are crowding out long-term development investment.

Debt Acceleration Driven by Private Markets

The 5.5% year-on-year increase was propelled by a rapid rise in private sector lending, marking a structural shift from the government-to-government lending that characterized previous debt cycles. World Bank Chief Statistician Haishan Fu stated: "Access to international finance has improved, but the price of that finance has not. Low- and middle-income countries are borrowing more, paying more, and, in many cases, leaving less for long-term development."

Recent sovereign issuance illustrates the pricing pressure: Laos borrowed at 11.5%, the Republic of Congo at 13.88%, and Kenya at 9.2%. Preliminary data for 2026 suggests lending continues at a rapid pace but at sustained high interest rates as global financing costs remain elevated.

Development Trade-offs and Food Security Linkages

The Bank's analysis draws a direct line between debt burdens and development outcomes. Examining food and nutrition security, the report found that global shocks have a more pronounced impact on food availability in heavily indebted countries. "Food and nutrition security provides a concrete example of these interactions, illustrating how debt burdens may be closely associated with a decline in the affordability of a healthy diet during periods of global stress," the report said.

This transmission mechanism — where debt service diverts fiscal space from social protection and agricultural investment — represents a quantifiable channel through which financial conditions affect human welfare indicators.

G20 Reform Push Confronts Creditor Complexity

The UK government is preparing a "new drive on debt" for its 2026 G20 presidency, with Prime Minister Andy Burnham linking the initiative to confronting historical legacies. Former Prime Minister Gordon Brown has been appointed to examine feasibility of changes to the global debt regime, while Foreign Secretary Ed Miliband outlined a "new deal" at the IMF annual meetings in Bangkok last month.

Proposals center on mobilizing multilateral development bank balance sheets to buy back outstanding debt, extending repayment periods and reducing interest rates. However, the creditor landscape has fundamentally changed since the 2005 Gleneagles summit, when G8 nations wrote off billions in sovereign debt. Today's creditors are predominantly private-sector bondholders, not governments, complicating coordinated restructuring.

African Union and Global South Momentum

Demands for framework reform have intensified from African Union heads of state and under the G20 chairs of Brazil and South Africa. The convergence of official sector initiatives and Global South advocacy creates diplomatic momentum, but the absence of a binding framework for private creditor participation remains the critical structural gap.

Forward Outlook: 2026 G20 Presidency as Inflection Point

The UK's G20 presidency in 2026 represents the next major milestone. Key deliverables to monitor include: the scope and capitalization of any MDB debt buyback facility; whether private creditors engage voluntarily in restructuring frameworks; and whether the Brown review produces actionable proposals for a sovereign debt workout mechanism. Preliminary 2026 borrowing data, expected in the next reporting cycle, will indicate whether the debt accumulation trajectory is moderating or accelerating.