External public debt is the money a country’s public sector owes to creditors located outside its borders. That includes borrowing by the central government, regional and local governments, the central bank, and state-owned enterprises, whenever the lender is a non-resident of the country. At the end of 2023, low- and middle-income countries alone owed a record $8.8 trillion in total external debt and spent $1.4 trillion servicing it.1World Bank. International Debt Report 2024
The technical definition, set out in the IMF’s External Debt Statistics Guide, has three parts: the debtor is a public-sector entity, the creditor is a non-resident, and the obligation requires future payments of principal or interest.2World Bank Data Help Desk. What Is External Debt? Everything else about the debt — its currency, its interest rate, the law that governs it — is secondary to those three tests.
What Makes a Debt “External”
The single question that classifies debt as external is where the creditor resides. Currency doesn’t decide it. A bond issued by the government and held by a foreign pension fund is external debt even if it pays in the borrowing country’s own currency. A dollar-denominated bond held by a domestic bank is internal debt, not external. The residency of the holder is the line.
Residency itself follows the IMF’s Balance of Payments Manual, which locates an entity where it has its “center of predominant economic interest.”3International Monetary Fund. G.4 Treatment of Special Purpose Entities and Residency For most creditors that means where they actually operate or live. For shell entities without much physical presence, residence follows the place of legal incorporation.
Two categories of financial claims are deliberately outside the definition. Equity investments, including shares in a state-owned enterprise, don’t count, because equity carries no contractual obligation to repay principal or interest. Financial derivatives are excluded for the same reason: no principal is advanced and no interest accrues.4International Monetary Fund. The Measurement of External Debt An unpaid derivatives payment that falls into arrears, however, does become a debt liability from that point on.
External Versus Internal Public Debt
The distinction between external and internal debt matters because the two create different economic pressures. Internal public debt is owed to domestic banks, pension funds, insurers, and citizens. Servicing it moves money from taxpayers to bondholders inside the country. The resources stay in the national economy. External debt service sends resources out. That outflow reduces domestic wealth and draws down foreign exchange reserves.
Currency is the second big difference. Internal debt is almost always denominated in the government’s own currency, which gives the state some monetary flexibility, though using it invites inflation. External debt for most developing countries is often denominated in U.S. dollars, euros, or yen. Economists call this pattern “original sin”: many emerging-market governments simply cannot borrow abroad in their own currency, so they take on the exchange-rate risk.
That risk is where crises come from. When a currency depreciates, every unit of foreign-currency debt becomes more expensive to repay in local terms, while tax revenue is still collected in the weakening local currency. The mismatch has triggered sovereign debt crises repeatedly. Internal debt is largely shielded from this because revenue and obligations sit in the same currency.
The United States is the notable exception. Because the dollar is the world’s primary reserve currency, most U.S. external debt is denominated in dollars. Treasury data showed roughly $18 trillion of U.S. gross external debt in domestic currency at the end of 2020, against about $1.5 trillion in foreign currency.5U.S. Department of the Treasury. Table B Gross External Debt Position Most countries do not have that option.
Who Holds the Debt
Creditors fall into three broad groups, and which group dominates a country’s debt profile affects the interest rate it pays and how any future crisis unfolds.
Official Bilateral Creditors
Bilateral debt is one government lending to another. The Paris Club, an informal group of creditor nations, has long been the main venue for coordinating these loans.6Club de Paris. What Are the Main Principles Underlying Paris Club Work Bilateral loans often carry below-market interest rates, are tied to development or geopolitical goals, and tend to come with more flexible terms in a downturn than commercial debt would.
Multilateral Institutions
Multilateral creditors are organizations established by multiple member countries: the IMF, the World Bank Group, and regional development banks like the Asian Development Bank.7Paris Club. Debt Categories Their lending funds macroeconomic stabilization, structural reforms, or specific development projects, usually with policy conditions the borrowing government must meet to draw funds.
Private Creditors
Private creditors are the largest and most varied group: commercial banks extending syndicated loans, institutional investors like hedge funds and mutual funds, and individual bondholders who buy sovereign securities on international markets. This debt is priced at market rates with little concessional element.
Sovereign bonds are the most volatile piece and the hardest to coordinate in a crisis. Bond contracts are typically governed by New York or English law, which makes them enforceable but inflexible. When restructuring becomes necessary, the number and diversity of bondholders can stretch negotiations for years.
Instruments and Maturity
External public debt takes several forms. Sovereign bonds are debt securities a government sells to international investors. When a bond is issued in a currency other than the issuer’s home currency, it is sometimes called a Eurobond — a term that predates the euro and refers to the foreign-currency issuance, not to Europe. Syndicated bank loans, official concessional loans, and trade credits round out the common instruments.
Maturity is the other classification. Short-term external debt has an original or remaining maturity of one year or less. Long-term debt has a maturity beyond one year.8International Monetary Fund. Remaining Maturity Classification – Clarification of the Definition The difference has real consequences. Short-term debt must be refinanced constantly, so a country with a lot of it carries rollover risk: if confidence drops, lenders can decline to refinance and a liquidity crisis follows almost immediately. Long-term debt gives the government more predictable servicing costs and more room to maneuver.
How Sustainability Is Measured
The amount of external public debt only means something in relation to the country’s capacity to pay. The joint IMF-World Bank Debt Sustainability Framework, designed for low-income countries, projects the debt burden over ten years and stress-tests it against economic and policy shocks.9International Monetary Fund. IMF-World Bank Debt Sustainability Framework for Low-Income Countries
The framework first classifies debt-carrying capacity as strong, medium, or weak, using a composite indicator that reflects historical growth, the growth outlook, remittances, reserves, and related factors. It then applies burden thresholds that tighten as capacity weakens:9International Monetary Fund. IMF-World Bank Debt Sustainability Framework for Low-Income Countries
- Strong capacity: external debt up to 55 percent of GDP; debt service up to 21 percent of exports.
- Medium capacity: external debt up to 40 percent of GDP; debt service up to 15 percent of exports.
- Weak capacity: external debt up to 30 percent of GDP; debt service up to 10 percent of exports.
Based on how actual debt compares to the thresholds, each country receives a rating of low, moderate, or high risk, or “in debt distress.” Distress means an event like arrears or restructuring has already happened or is imminent. These ratings shape how much new lending international institutions are willing to support.
Guarantees and Hidden Debt
The standard definition of gross external debt excludes contingent liabilities. Guarantees, letters of comfort, and similar promises don’t count as external debt until the underlying condition is triggered.4International Monetary Fund. The Measurement of External Debt But governments frequently guarantee the foreign borrowing of state-owned enterprises and, sometimes, private companies. If the borrower defaults, the government pays, and the contingent liability becomes real external public debt overnight.
For that reason, international reporting frameworks track publicly guaranteed private debt as a separate line alongside direct government borrowing, valued at the full face amount of the guaranteed obligation.10International Monetary Fund. External Debt Statistics Guide – Chapter 9 Undisclosed state-backed borrowing is a recurring source of debt crises: Mozambique’s external public debt jumped from 61 percent of GDP to 104 percent within two years after undisclosed loans of more than $2 billion came to light in the mid-2010s, triggering a sovereign default. Strengthening disclosure around state-owned enterprise borrowing is one of the most consistent recommendations after any transparency failure.
What Happens When a Country Defaults
Sovereign default — a missed scheduled payment on external debt — has concrete consequences that tend to compound. The most immediate is loss of access to international capital markets. A defaulting government cannot practically issue new bonds in the jurisdictions where its creditors operate, cutting off the main channel for refinancing existing debt.
Credit rating agencies downgrade the sovereign, which raises borrowing costs for years and spills into the private sector. Domestic banks and companies that depend on the sovereign’s credit standing pay more to borrow abroad. Interest rates charged by official creditors to the poorest borrowing countries more than doubled in recent years, climbing above 4 percent, while private-creditor rates hit a 15-year high of 6 percent.1World Bank. International Debt Report 2024
Creditor litigation has grown too. Since the mid-2000s, roughly half of sovereign defaults have involved lawsuits in foreign courts, compared with less than 10 percent in the 1980s and early 1990s. Creditors pursue sovereign assets abroad and court orders that block a defaulting government from tapping international markets. When attachment proceedings are active, sovereign bond issuance in those jurisdictions drops to near zero.
How Unsustainable Debt Gets Restructured
Several established mechanisms exist for handling debt that can’t be repaid on original terms. Which one applies depends on who the creditors are.
The Heavily Indebted Poor Countries Initiative, launched by the IMF and World Bank, targets the poorest nations with unsustainable burdens. Eligible countries must demonstrate a track record of reform and prepare a poverty reduction strategy. Countries that complete the process receive 100 percent relief on eligible debts from the IMF, the World Bank, and the African Development Fund. Of the 39 eligible or potentially eligible countries, 36 have reached the completion point.11International Monetary Fund. Debt Relief Under the Heavily Indebted Poor Countries Initiative
For low-income countries outside HIPC, the G20 Common Framework is the newer mechanism. It pulls Paris Club creditors, G20 members, and other official bilateral lenders into a single creditor committee to negotiate debt treatments tied to an IMF program. The framework’s core principle is “comparability of treatment”: the debtor must seek terms from all other creditors, including private ones, that are at least as favorable as those agreed with the official committee.12Club de Paris. The G20 Common Framework for Debt Treatments Beyond the DSSI
For privately held bonds, collective action clauses are the working tool. These contract provisions let a supermajority of bondholders approve changes to the payment terms that bind all holders, including those who voted no. An enhanced version introduced in 2014 allows multiple bond series to be aggregated under a single vote, reducing the ability of small holdout groups to block a restructuring that most creditors accept.