The International Monetary Fund projects that global public debt will climb back toward the highs seen during the COVID-19 pandemic, approaching 100% of world GDP by 2030. Public debt surged to 98.9% of global GDP in 2020, fell by roughly 10 percentage points over the following two years as economies rebounded, and is now on an upward trajectory once again.
The IMF highlights rising policy uncertainty as a major contributor to the deteriorating fiscal outlook. Recent tariff announcements by the United States, together with the prospect of retaliatory trade measures from affected partners, are identified as drivers of added economic volatility. That heightened uncertainty is reflected in the Fund’s forecast for global fiscal balances: fiscal deficits are expected to widen to about 5.1% of global GDP in 2025, a modest increase from an estimated 5.0% in 2024.
Under alternative scenarios, the outlook is considerably more severe. If a policy shift toward significantly higher U.S. tariffs were to prompt broad retaliatory actions, the IMF’s model indicates global public debt could rise quickly to more than 117% of GDP by 2027. That level would represent the highest concentration of public debt relative to global output since the aftermath of World War II. These risk scenarios do not assume they will occur; rather, they illustrate how trade tensions and policy responses can amplify borrowing needs and slow growth, producing markedly worse debt dynamics.
Although only about one-third of IMF member countries currently display debt growth that is faster than their pre-pandemic trajectories, those countries account for roughly 80% of global GDP. In other words, the acceleration in public debt is concentrated among the world’s largest economies. That concentration matters because large economies have an outsized impact on global interest rates, financial market stability, and cross-border capital flows. Rising debt burdens in a handful of major economies therefore pose systemic risks that can spread through trade, investment and financial channels.
Several structural forces are contributing to the renewed rise in public debt across advanced and emerging economies. Aging populations, higher healthcare and social spending, elevated interest rates compared with the pre-pandemic decade, and periodic stimulus measures to sustain growth or respond to shocks all increase the need for public borrowing. At the same time, sluggish productivity growth in many countries limits governments’ ability to generate the tax revenue needed to stabilize debt-to-GDP ratios without cutting spending or raising taxes.
Policy choices will be decisive in shaping future debt paths. Fiscal consolidation—through a combination of better-targeted spending, reforms that raise long-term growth potential, and credible revenue measures—can help stabilize debt ratios without unduly slowing recovery. Conversely, protectionist trade policies that depress growth and invite retaliation can make consolidation harder by reducing revenues and increasing the cost of borrowing. The IMF’s analysis underscores the importance of multilateral cooperation, transparent fiscal frameworks, and structural reforms that boost productivity and broaden the tax base.
For policymakers, the immediate challenge is to strike a balance between supporting economic activity and restoring fiscal buffers. Targeted investments in infrastructure, education and innovation can raise potential output and support long-term debt sustainability if they are financed in ways that preserve fiscal credibility. Meanwhile, clear communication about medium-term fiscal plans and conditional rules for emergency spending can help anchor market expectations and contain interest-rate pressures.
In sum, the IMF’s projections signal a return to historically high global public debt ratios unless countries adopt prudent fiscal strategies and avoid policies that heighten global economic tensions. While only a subset of countries accounts for most of the rise in debt, their central role in the global economy means that policy missteps could have widespread and lasting consequences. Sound fiscal management, structural reforms to lift productivity, and restraint on measures that provoke retaliatory trade responses will be essential to prevent a further escalation in global debt burdens over the coming decade.