What Is Reserve Currency?

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A reserve currency is a currency held in large quantities by governments and institutions. These currencies are used as a means of international payment and to support the value of national currencies.

Key Takeaways

  • A reserve currency is a foreign currency or precious metal held in large quantities by governments and institutions.
  • These currencies are used as a means of international payment and investment; they also support the value of national currencies.
  • During World War II, the U.S. dollar was set as the international reserve currency. Since the 1970s, strong economies in many countries have led to the rise of others.
  • Reserve currencies held in large quantities around the world include the U.S. dollar, euro, Japanese yen, Chinese renminbi, and British pound sterling.

Definition and Example of Reserve Currency

A reserve currency is a foreign currency or precious metal that is held in large quantities; it may be held by a country's government, central bank, or other monetary authority. It is used for participating in the global economy, such as through international transactions or investments.

In general, a reserve currency is one that:

  • Has the depth and liquidity to allow for reliable and efficient international transactions
  • Can be freely and easily exchanged for other currencies
  • Is held by many monetary authorities and institutions, in significant amounts

Before the mid-20th century, reserves were mostly gold and silver. Modern reserves are generally made up of strong foreign currencies. Many of them are specifically designated as reserve currencies by the International Monetary Fund (IMF). Reserve currencies can also be foreign currency securities, deposits, and loans.

Starting in the mid-20th century, the U.S. dollar was set as the international reserve currency. Since then, strong economies in many countries have led to the rise of other international reserve currencies.

There are multiple key factors that make a currency useful as a reserve currency, including:

  • The size of the economy in the country where that currency comes from
  • How important that economy is internationally
  • How open its financial markets are
  • The currency's convertibility
  • Whether it is used as a regional or international currency peg
  • Domestic macroeconomic policies

The countries with the most foreign reserve currency in 2021 were:

  1. China: $3.43 trillion
  2. Japan: $1.41 trillion
  3. Switzerland: $1.11 trillion
  4. United States: $716.15 billion
  5. India: $638.48 billion
  6. Russian Federation: $632.24 billion

These reserves are rounded up to the nearest billion; they include gold, U.S. dollars, and other reserve currencies.


The entire Euro Area, as designated by the World Bank, is made up of 19 countries. It holds $914 billion in reserve currency.

How Reserve Currency Works

Countries hold reserve currency for a number of different reasons. They are a strong indicator of the ability to repay foreign debt. They also can defend a national currency and even determine sovereign credit ratings.

Foreign transactions often involve reserve currencies rather than the currencies of the two countries involved. For instance, in 2008, trade with the U.S. accounted for only 20% of international transactions in Asian countries, even though the bulk of these were conducted in U.S. dollars. These transactions used the U.S. dollar as a reserve currency, which was accepted internationally, rather than the local currencies of the countries involved.

Reserve currencies impact monetary policies and trade around the globe. Monetary policy has a strong effect on foreign currency reserves. Most major economies with flexible or floating exchange rate schemes clear excess supply and demand by buying or selling reserve currency. For instance, a country that wants to boost the value of its currency can repurchase its national currency with its foreign currency reserves.

Other countries may employ fixed exchange rate schemes for a variety of reasons. Under this type of system, supply and demand can move the value of its national currency higher or lower. For instance, increased demand due to a relatively strong economy would lead to a higher value for a country's currency.

Countries also keep an eye on major reserve currencies to ensure that their holdings aren't adversely affected. For instance, strong inflation in the U.S. could cause a devaluation of the U.S. dollar. It could also cause the devaluation of foreign currency reserves. In the end, this limits the monetary policy benefits that are achievable using these reserves. It creates only a marginal benefit for a country's currency if it is considered a reserve currency around the world.

Notable Happenings

Currency reserves used to consist mostly of gold and silver, but the Bretton Woods agreement in 1944 set the U.S. dollar as an international reserve currency and replaced the British pound sterling. This agreement was formed during World War II. It chose the U.S. dollar because of the strength of the U.S. economy, which hadn't been damaged by the war the way other European and Asian countries' economies had. The U.S. dollar was also still backed by gold at the time; its value was set at $35 per ounce. That made the dollar more stable than other currencies and put a system of fixed exchange rates in place.


The Bretton Woods Agreement also created the World Bank Group (World Bank) and the IMF.

In 1973, President Nixon's New Economic Policy brought an end to the Bretton Woods system of fixed exchange rates. It also decoupled the U.S. dollar from the value of gold, which opened up the world to the rise of new reserve currencies.

Types of Reserve Currency

Today, the U.S. dollar isn't the only reserve currency designated by the IMF and other global organizations. The euro, Chinese renminbi, Japanese yen, and British pound sterling are all popular as reserve currencies, due to the sizes of their economies.

Allocated International Reserves
Reserve Currency Value* (U.S. dollars, billions)
U.S. dollar 6,794.91
Euro 2,197.30
Japanese yen 624.97
British pound sterling 486.08
Chinese renminbi 221.48
*at the end of 2020 Q1

Other currencies that the IMF tracks as reserve currencies include the Australian dollar, Canadian dollar, and Swiss franc.

China has positioned its currency as next in line to the U.S. dollar; it has been the largest contributor to world growth since 2008's global financial crisis. China's renminbi was named by the IMF as a global reserve currency in 2015. However, the euro still accounts for the largest portion of currency reserves after the U.S. dollar due to the economic size of the European Union.

The popularity of reserve currencies is a function of their stability and reputation. For example, the Chinese yuan hasn't taken off as a major reserve currency due to concerns over a sudden devaluation that could send their value lower. The same is true for the euro following the sovereign debt crisis in 2009 and the immigration crisis in 2016 and 2017. These issues have led to concerns over currency volatility, which has kept the U.S. dollar as the most popular reserve currency through the early twenty-first century.

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The Balance uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
  1. International Monetary Fund. "Twenty-Eighth Meeting of the IMF Committee on Balance of Payments Statistics: Clarifying the Concept of Reserve Assets and Reserve Currency," Pages 4-5.

  2. U.S. Department of the Treasury. "Appendix 1: An Historical Perspective on the Reserve Currency Status of the U.S. Dollar."

  3. IMFBlog. "Reserve Currencies in the Post-Crisis International Monetary System."

  4. The World Bank. "Total Reserves (Includes Gold, Current US$) - Euro Area."

  5. Department of Senate, Office of the Historian. "Nixon and the End of the Bretton Woods System, 1971–1973."

  6. The World Bank. "The World Bank Group and the International Monetary Fund (IMF)."

  7. International Monetary Fund. "Currency Composition of Official Foreign Exchange Reserves (COFER)."

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