Governments take on debt when their spending exceeds their revenue, using borrowed funds to cover operational costs or to carry out investment, for example in infrastructure projects. However, borrowing carries the burden of interest payments and should be guided by careful evaluation of economic needs, infrastructure demands, social and sectoral priorities, and a balanced analysis of the potential costs and benefits. During the COVID-19 pandemic, most OECD nations expanded public spending through stimulus measures aimed at supporting individuals and businesses, leading to increased public debt levels.
In 2023, government debt across OECD countries averaged 110.5% of GDP (Figure 16.9). Between 2019 and 2023, the average debt-to-GDP ratio rose by 1.7 percentage points. Despite this overall increase, 19 out of the 36 countries with available data recorded declines in their debt levels. The most significant reductions occurred in Portugal (30.3 percentage points), Ireland (22.6 p.p.), and Greece (18.7 p.p.), all of which have experienced strong economic growth in recent years. On average, OECD-EU countries saw a seven-percentage point decrease in debt between 2019 and 2024. However, this reduction should be carefully considered, as debt spiked during the COVID-19 pandemic—reaching an average of 128.9% of GDP across OECD countries in 2020—and has since decreased by 18.5 percentage points, moving closer to pre-pandemic levels (Figure 16.10). Overall debt levels remain elevated and without sustained action are projected to grow further. Decisive fiscal actions are needed to ensure debt sustainability, preserve room for governments to react to future shocks and generate resources to help meet large current and impending spending pressures from ageing populations, climate change mitigation and adaptation measures, and plans to significantly enhance defence spending (OECD 2025).
General government gross debt also rose significantly on a per capita basis. In 2019, the average per capita gross debt across OECD countries stood at USD 58 090 (PPP). By 2023, this figure had increased by an average of USD 14347 (PPP) across all OECD countries, and by USD 5 760 (PPP) in OECD-EU countries. Debt per capita rose in 32 of the 36 countries with available data. However, between 2019 and 2024, four OECD countries recorded a decline in per capita debt: Ireland (down USD 11241 PPP), Denmark (USD 4 994), the United Kingdom (USD 2 830), and Portugal (USD 1 280). The majority of public debt in OECD countries—79.3%—is held in the form of debt securities, such as government bonds. In 31 out of 36 countries with available data, more than half of public debt is issued as debt securities. Only in Estonia, Greece, and Norway the majority of public debt takes the form of loans (Online Figure J.11.4).