The next global debt crisis may not arrive with the drama of Lehman Brothers. No spectacular market collapse. No single bank failure. Instead, warning signs could appear quietly. A sovereign bond rolled over at a punishing rate. A development project postponed. A health budget squeezed. Or a cash-strapped government forced to spend more on debt servicing than on health and education.
IMF Managing Director Kristalina Georgieva has sounded a similar alarm. As advanced-economy bond yields rise, they lift yield curves worldwide, she said after the G20 finance ministers’ meeting earlier this month. For some emerging economies, financing costs can more than erase hard-won reductions in risk premiums. Countries that have improved their fiscal credibility can, therefore, find themselves paying more simply because the global price of capital has changed.
The story begins with the post-pandemic monetary tightening. Between March 2022 and July 2023, the US Federal Reserve hiked its rate from near-zero to 5.25%-5.50% in one of the fastest tightening cycles in decades. However, easing that followed hasn’t produced a corresponding decline in long-term borrowing costs.
Short-term rates are heavily influenced by central banks, while long-term yields also reflect inflation projections, government borrowing, fiscal sustainability, geopolitical risks, and bond supply and demand.
The IMF’s April 2026 Fiscal Monitor paints the broader picture. Global public debt ballooned to nearly 94% of GDP in 2025. And it is projected to soar past 100% by 2029. Much of the increase is driven by major economies facing rising demands for social spending, defence and strategic investment, while interest burdens are also increasing.
