Introduction

Countries by highest national debt ranks nations according to the total amount of government debt they owe, usually measured in U.S. dollars. National debt is one of the most closely watched economic indicators because it reflects how much a government has borrowed over time to finance public spending, infrastructure, defense, healthcare, education, social programs, and other national priorities.

Having a large national debt does not automatically mean a country has a weak economy. Many of the world’s largest economies—including the United States, Japan, the United Kingdom, France, and Italy—also have the largest public debts because of their large populations, extensive government spending, and sizable economies.

Economists generally evaluate debt using two key measurements:

• Total National Debt – the total amount of money owed by a country’s government.
• Debt-to-GDP Ratio – national debt expressed as a percentage of the country’s Gross Domestic Product (GDP), showing whether debt is manageable relative to the size of the economy.

While governments often borrow to stimulate economic growth or respond to financial crises, excessive debt can increase borrowing costs, limit fiscal flexibility, and place long-term pressure on public finances.

This page presents the latest Countries by Highest National Debt (2024) rankings using data published by World Population Review, allowing comparisons of both total government debt and debt as a percentage of GDP.

What Is National Debt?

National debt, also called government debt, public debt, or sovereign debt, is the total amount of money a country’s central government owes to domestic and foreign lenders.

Governments accumulate debt when annual expenditures exceed tax revenues and other sources of income. Instead of immediately raising taxes or reducing spending, governments often borrow money through government bonds and other financial instruments.

National debt generally consists of:

• Domestic debt
• External (foreign) debt
• Government bonds
• Treasury securities
• Public borrowing
• Long-term loans
• Short-term borrowing obligations

Borrowing enables governments to finance large projects and respond to emergencies, but it also creates future repayment obligations through principal payments and interest.

How National Debt Is Measured

National debt can be evaluated using several internationally recognized indicators.

Total National Debt

This represents the total outstanding debt owed by the central government, typically reported in U.S. dollars.

Debt-to-GDP Ratio

The debt-to-GDP ratio compares a country’s government debt with the total value of goods and services produced by its economy during one year.

For example:

• Debt: $500 billion
• GDP: $1 trillion

Debt-to-GDP Ratio:

50%

This ratio helps economists determine whether debt levels are sustainable.

Per Capita Debt

Some analysts divide national debt by population to estimate the average debt burden per resident.

Annual Borrowing

Governments also monitor yearly borrowing requirements resulting from fiscal deficits.

History of Government Debt

Government borrowing has existed for centuries. Ancient kingdoms borrowed funds during wars and periods of economic hardship.

Modern national debt systems expanded significantly after the Industrial Revolution as governments began issuing bonds to finance infrastructure, railways, ports, education, and public services.

Major historical events—including the two World Wars, the 2008 Global Financial Crisis, and the COVID-19 pandemic—led many governments to increase borrowing dramatically to stabilize economies and support businesses and households.

Today, nearly every country carries some level of government debt, making debt management an essential component of modern economic policy.

Why Governments Borrow Money

Borrowing allows governments to invest in long-term economic development without immediately increasing taxes.

Common reasons include:

• Building transportation infrastructure.
• Expanding healthcare systems.
• Funding education.
• Supporting defense and national security.
• Financing disaster recovery.
• Responding to economic recessions.
• Managing public pensions.
• Supporting social welfare programs.
• Investing in renewable energy and technology.
• Stabilizing financial markets during crises.

When managed responsibly, borrowing can contribute to economic growth by financing productive investments. However, excessive borrowing may increase future financial risks if debt grows faster than the economy.

Factors That Increase National Debt

National debt does not grow for a single reason. It usually increases because governments spend more money than they collect through taxes and other revenue sources. During economic crises, wars, pandemics, or natural disasters, governments often borrow heavily to support citizens and stabilize the economy. Below are the main drivers behind rising public debt.

Budget Deficits

A budget deficit occurs when government spending exceeds government income during a fiscal year. Continuous deficits require governments to borrow money, causing national debt to accumulate over time.

Economic Recessions

During recessions, tax revenue declines while spending on unemployment benefits, social programs, and economic stimulus rises. This combination often leads to significantly higher borrowing.

Infrastructure Investment

Many countries issue government bonds to finance highways, railways, airports, hospitals, schools, renewable energy projects, and digital infrastructure. Although these investments can promote long-term growth, they also increase debt in the short term.

Military and Defense Spending

Defense budgets represent one of the largest expenditures for many nations. Military modernization, overseas operations, and national security initiatives frequently require substantial government borrowing.

Healthcare and Social Welfare

Public healthcare systems, pensions, unemployment assistance, and social security programs account for a large share of government expenditures. Aging populations can place additional pressure on public finances.

Interest Payments

Governments must pay interest on existing debt. As debt grows or interest rates increase, debt servicing becomes more expensive, creating a cycle where additional borrowing may be required.

Tax Policy

Lower tax collections due to tax reductions, economic slowdowns, or weak tax administration can widen fiscal deficits and increase borrowing needs.

Natural Disasters and Emergencies

Earthquakes, floods, droughts, hurricanes, pandemics, and other emergencies often force governments to spend billions on recovery, reconstruction, and emergency relief.

Currency Depreciation

Countries with large amounts of foreign-currency debt may see their repayment costs rise if their domestic currency weakens against major international currencies.

Political Decisions

Expansionary fiscal policies, election spending, subsidies, and public investment programs can significantly affect debt levels depending on government priorities.

Countries with the Highest Debt-to-GDP Ratio

While total debt measures the overall amount owed, the debt-to-GDP ratio shows how large that debt is compared to the country’s economy. This indicator helps economists evaluate whether government debt is sustainable.

According to the 2024 data:

Note: Zambia’s reported ratio is an extreme outlier in the source data and should be interpreted with caution, as different organizations report significantly different estimates.

Countries with the Lowest Debt-to-GDP Ratio

Some countries maintain relatively low government debt compared to the size of their economies.

Low debt ratios generally provide governments with greater fiscal flexibility during economic downturns, although they do not automatically guarantee strong economic performance.

Which Countries Have the Largest Total National Debt?

The world’s biggest economies generally hold the largest amounts of government debt because they finance extensive public services, infrastructure projects, defense budgets, and social welfare systems.

The United States remains the world’s largest debtor, with more than $30 trillion in government debt. Japan ranks second, followed by the United Kingdom, Italy, France, Germany, India, Taiwan, Brazil, and Spain. Together, these countries account for a substantial share of global sovereign debt.

Large economies often have higher debt because they also possess larger financial markets capable of supporting significant government borrowing. Investors frequently view government bonds issued by advanced economies as relatively safe assets, allowing these countries to borrow at favorable interest rates.

Economic Effects of High National Debt

National debt can influence nearly every aspect of a country’s economy. Whether the impact is positive or negative depends on how borrowed funds are used, the country’s economic growth, interest rates, and its ability to repay debt over time.

Positive Effects of National Debt

When managed responsibly, government borrowing can support long-term economic development.

Funds Infrastructure Development

Borrowed money often finances highways, railways, ports, airports, hospitals, schools, and digital infrastructure. These investments improve productivity and strengthen economic growth over time.

Supports Economic Growth

Governments frequently increase spending during recessions to stimulate demand, create jobs, and prevent deeper economic downturns.

Helps During Emergencies

National debt enables countries to respond quickly to natural disasters, pandemics, wars, and financial crises without waiting for additional tax revenue.

Improves Public Services

Borrowing can support healthcare, education, housing, public transportation, and social welfare programs that improve citizens’ quality of life.

Encourages Investment

Government investment in research, technology, renewable energy, and innovation can increase productivity and future economic output.

Negative Effects of High National Debt

Excessive borrowing can create serious economic challenges if debt grows faster than the economy.

Higher Interest Costs

As debt increases, governments must spend more money servicing interest payments. This reduces funds available for education, healthcare, infrastructure, and other essential services.

Increased Tax Burden

Governments may eventually increase taxes or reduce spending to stabilize public finances and repay debt.

Reduced Fiscal Flexibility

Countries with high debt have less room to borrow during future crises because lenders may demand higher interest rates.

Inflation Risks

If borrowing is financed through excessive money creation, inflation may accelerate, reducing household purchasing power.

Lower Investor Confidence

Very high debt levels may reduce investor confidence, increase borrowing costs, and weaken financial stability.

Slower Economic Growth

Persistent debt can crowd out productive investment if governments allocate an increasing share of budgets toward debt servicing instead of growth-oriented projects.

Advantages of Maintaining Sustainable National Debt

A moderate and sustainable debt level can provide important economic benefits.

• Enables governments to finance long-term infrastructure projects.

• Supports economic recovery during recessions.

• Helps stabilize employment through public spending.

• Provides emergency funding during national crises.

• Strengthens financial markets through government bond issuance.

• Allows investment in education, healthcare, science, and technology.

• Can improve long-term productivity when borrowed funds are invested efficiently.

Disadvantages of Excessive National Debt

Debt becomes problematic when borrowing consistently exceeds economic growth.

• Higher annual interest payments.

• Increased pressure for future tax increases.

• Reduced government spending on essential public services.

• Greater vulnerability to rising global interest rates.

• Possible credit rating downgrades.

• Currency depreciation in some economies.

• Higher refinancing risks.

• Reduced investor confidence.

• Slower long-term economic growth.

• Greater burden on future generations.

National Debt vs Budget Deficit

Although often used interchangeably, these terms have different meanings.

A country may record a budget surplus in one year while still carrying a large national debt accumulated over previous decades.

Why Debt-to-GDP Ratio Matters

Economists generally place more emphasis on the debt-to-GDP ratio than on total debt alone because it compares government borrowing with the country’s economic capacity.

A nation with a large economy can often manage higher debt more easily than a smaller economy with much lower borrowing. For this reason, debt sustainability depends not only on the amount borrowed but also on economic growth, government revenue, interest rates, and fiscal management.

Countries with stable growth, diversified economies, and strong tax systems typically have greater capacity to maintain higher debt levels than countries with weaker economic fundamentals.

Frequently Asked Questions (FAQs)

What is national debt?

National debt is the total amount of money a country’s government owes to lenders after borrowing to finance budget deficits, public services, infrastructure, and other government expenditures.

Which country has the highest national debt in 2024?

Based on available 2024 data, the United States has the world’s largest total national debt at more than $30 trillion.

Which country has the highest debt-to-GDP ratio?

According to the provided 2024 dataset, Zambia has the highest reported debt-to-GDP ratio. However, this value appears to be an outlier and should be interpreted cautiously. Among major economies, Japan has one of the highest debt-to-GDP ratios at around 201%.

Why does the United States have such high national debt?

The United States has a large debt because it finances extensive government programs, defense spending, healthcare, Social Security, infrastructure, and economic stimulus while maintaining one of the world’s largest economies.

Is a high national debt always bad?

No. High debt is not necessarily harmful if the economy is growing, borrowing costs remain manageable, and borrowed funds are invested productively.

What is the difference between national debt and budget deficit?

A budget deficit is the amount by which government spending exceeds revenue in a single year, while national debt is the total accumulation of past borrowing.

How is national debt measured?

National debt is usually measured in a country’s currency or U.S. dollars and is commonly compared with Gross Domestic Product (GDP) using the debt-to-GDP ratio.

Why is the debt-to-GDP ratio important?

The debt-to-GDP ratio shows a country’s ability to repay debt relative to the size of its economy and is one of the most widely used indicators of fiscal sustainability.

Which countries have the lowest debt-to-GDP ratios?

Countries such as Brunei, Kuwait, Turkmenistan, Switzerland, Denmark, Norway, and Azerbaijan maintain relatively low debt-to-GDP ratios according to the available 2024 data.

Can governments reduce national debt?

Yes. Governments can reduce debt by increasing tax revenue, reducing public spending, promoting economic growth, privatizing assets, and maintaining budget surpluses.

Who lends money to governments?

Governments borrow from domestic investors, commercial banks, pension funds, insurance companies, central banks, foreign governments, and international financial institutions by issuing government bonds and other debt securities.

What happens if a country cannot repay its debt?

A country may restructure its debt, negotiate with creditors, seek assistance from international organizations, or, in severe cases, default on its obligations.

Does every country have national debt?

Almost every country carries some level of government debt because borrowing is a common tool for financing public investment and managing economic cycles.

Which continent has the highest government debt?

North America and Europe account for a significant share of global government debt due to the large economies of the United States and many European nations.

Where does the national debt data come from?

The rankings on this page are based on the latest available data compiled by World Population Review, using information from international financial institutions and government statistical sources.

Conclusion

National debt is one of the most important indicators of a country’s fiscal health and long-term economic stability. While large economies such as the United States, Japan, the United Kingdom, Italy, and France hold the highest total government debt, the debt-to-GDP ratio often provides a more meaningful measure of financial sustainability.

Borrowing can help governments finance infrastructure, education, healthcare, defense, and economic recovery during crises. However, excessive debt may increase interest costs, reduce fiscal flexibility, slow economic growth, and place additional pressure on future government budgets.

Understanding both total national debt and debt-to-GDP ratio offers a clearer picture of how countries manage public finances and their capacity to support long-term economic development.

Source: World Population Review (Latest National Debt by Country data).