Governments borrow to invest and to get through crises, and public debt that is used well can support development. The problem starts when repaying it takes so much of a country's revenue that spending on health, education, nutrition or climate adaptation has to be squeezed. UNCTAD estimates that global public debt reached US$102 trillion in 2024, of which developing countries owed US$31 trillion, almost twice their share of 2010. Developing regions borrow at interest rates two to four times higher than the United States, and in 2024, 61 developing countries spent at least 10% of government revenue on interest, twice as many as in 2010.
The World Bank's International Debt Report 2025 found that low- and middle-income countries paid a record US$415 billion in interest on their external debt in 2024, and that between 2022 and 2024 they paid out US$741 billion more in principal and interest than they received in new lending, the widest gap in at least 50 years. The pressure falls hardest on low-income countries with few other sources of finance: by March 2026 the IMF rated 9 low-income countries as already in debt distress and 23 more at high risk. When a government runs short, it may delay salaries, cut services or default, and restructuring its debt has become slower than in earlier decades.
When debt becomes a burden
SDG target 17.4 asks the international community to help developing countries reach long-term debt sustainability through coordinated debt financing, debt relief and debt restructuring, and to reduce debt distress in highly indebted poor countries. No single number defines a debt problem; the measures used most often are:
Debt service relative to exports
SDG indicator 17.4.1: principal and interest paid on external debt as a share of a country's earnings from exports of goods, services and primary income. It shows how much foreign currency income goes to creditors. It is compiled by the World Bank's International Debt Statistics for low- and middle-income countries.
Interest relative to government revenue
The share of tax and other government revenue spent on interest on all public debt, domestic and external. UNCTAD uses 10% of revenue as a warning threshold.
Interest compared with social spending
UNCTAD compares each government's interest bill with its public spending on health and on education, averaged over 2021 to 2023, and counts the people living in countries where interest is larger.
Risk of debt distress
The IMF and World Bank rate low-income countries as at low, moderate or high risk of debt distress, or already in debt distress, based on projections of debt and repayment burdens under the joint Debt Sustainability Framework for Low-Income Countries.