Global public debt nears 100% of GDP by 2029

For investors, the implications are broad. Sovereign bond markets have become more sensitive to fiscal credibility, especially in countries where debt is large and growth is not enough to stabilize the ratio. The U.S. sits in the top 10 with projected gross government debt at 126.79% of GDP in 2026, while France is at 118.46%. Japan remains near 200%, but with a deeper domestic funding base and debt largely denominated in yen, giving it more flexibility than many peers. Singapore’s 166.42% ratio looks alarming on the surface, yet its government says the borrowing is tied to investment and reserve management and is backed by assets that exceed liabilities, underscoring that the headline ratio alone does not determine credit stress.

At the top end, Sudan’s projected 334.41% debt ratio reflects not just fiscal strain but the destruction of its economy from civil war, making the debt burden far harder to manage than in advanced markets. That distinction is important for markets: the debt ratio is only part of the story, but conflict, weak revenue collection and currency instability can quickly turn a balance-sheet problem into a financing crisis.

The backdrop is a bond market already adjusting to a higher-rate world. The 10-year U.S. Treasury yield has risen to about 5.17%, while the 10-year minus 2-year curve has narrowed to 0.301 percentage point, a sign markets still expect growth to slow even as funding costs stay elevated. Long-duration Treasuries, reflected by the iShares 20+ Year Treasury Bond ETF, have rebounded from recent lows but remain below their 200-day moving average, suggesting investors have not fully embraced a durable rally in government debt.

That makes the IMF warning more than a statistical milestone. If growth softens, deficits widen or refinancing needs spike, debt service will take up a larger share of budgets and leave less room for public investment, support for households or defense. The bull case is that strong institutions, deep capital markets and, in some cases, large asset buffers can keep major borrowers funded. The bear case is that prolonged high rates expose the difference between countries that can roll debt and those that must eventually adjust policy.

For investors, the message is to separate sovereigns by funding structure, currency, reserves and political willingness to tighten budgets. The world is not at an immediate debt crisis point, but it is moving into a period where fiscal discipline matters more because money is no longer cheap.