Why the US Dollar Is the World's Reserve Currency — And What Threatens It

Central banks around the world held 58% of their disclosed foreign exchange reserves in US dollars in 2024, according to a July 2025 Federal Reserve note. In April 2025, the dollar was on one side of 89.2% of all currency trades, according to the Bank for International Settlements (BIS). A Brazilian firm buying Indonesian goods may well settle the bill in dollars even though no American is involved. This is what economists mean by a reserve currency, and it is why the dollar's status matters to people who never touch one.

Educational only, not financial advice. Investing involves risk of loss; past performance does not guarantee future results. Consult a licensed financial advisor before making investment decisions.

The dollar's position is not an accident of American power alone, and it is not as fragile as headlines about "de-dollarization" suggest. This article traces how the dollar got here, what the data show about its current role, and why the challengers so far have struggled to take its place.

Key takeaways

• The dollar became the center of the international monetary system at the 1944 Bretton Woods conference, where currencies were fixed to the dollar and the dollar was fixed to gold at $35 an ounce.
• The gold link ended on August 15, 1971, yet the dollar kept its role, because the real foundations are deep financial markets, legal trust, and network effects.
• The dollar's share of official reserves fell from a peak of 72% in 2001 to 58% in 2024, and has been roughly flat since 2022, according to the Federal Reserve.
• Gold, the renminbi, and BRICS payment projects are real developments, but none has yet replaced what the dollar does.
• A gradual shift toward a more multipolar system is more plausible than a sudden replacement.

The dollar by the numbers

Before the history, the current picture. "Reserve currency" is not one measurement but several different roles, and the dollar leads in nearly all of them.

Role	Dollar	Euro	Source and period
Share of official foreign exchange reserves	58%	20%	Federal Reserve note, 2024 data
Share of FX trades with that currency on one side	89.2%	28.9%	BIS Triennial Survey, April 2025
Share of foreign currency debt issuance	about 60%	26%	Federal Reserve note, data through 2024
Share of international banking claims	about 55%	about 20%	Federal Reserve note, 1999 to 2024
Share of international banking liabilities	about 60%	about 20%	Federal Reserve note, 1999 to 2024

FX shares add to 200% because every trade involves two currencies. Sources: Federal Reserve FEDS Note, July 18, 2025; BIS Triennial Central Bank Survey 2025.

Trade invoicing, meaning which currency appears on the bill, shows the same pattern. The Federal Reserve note reports that from 1999 to 2019 the dollar accounted on average for 96% of trade invoicing in the Americas, 74% in Asia-Pacific, and 79% in the rest of the world outside Europe, where the euro leads at 66%. According to the BIS, total FX trading reached $9.6 trillion a day in April 2025, up 28% from $7.5 trillion in 2022.

The same note builds an index of international currency use. The dollar scores roughly 65 to 70 and has done so since 2010. The euro scores about 24, the Japanese yen about 7, the British pound about 6, and the renminbi about 3.

What a reserve currency does

A currency becomes a reserve currency when governments and large institutions outside its home country choose to hold it. Economists usually describe three jobs, and a reserve currency does all three at global scale:

1. Store of value. Central banks keep reserves to defend their exchange rates and to cover emergencies. Most official dollar reserves are held in US Treasury securities, which foreign investors hold in large amounts: the Federal Reserve note reports $9 trillion, or 32% of marketable Treasuries, as of the first quarter of 2025, down from almost 50% in 2014.
2. Medium of exchange. Banks and firms use it to settle trades between third countries. The 89.2% FX figure above is a measure of this role.
3. Unit of account. Prices, loan contracts, and commodity quotes are written in it.

Think of a reserve currency as a shared language for money. A traveler who speaks English can get by in many countries not because English is the best language but because so many others also use it. That is the "network effect" idea, and it matters more than any single policy.

For a country holding reserves, the practical test is whether it can sell the asset quickly at a predictable price during a crisis. That requires a very large, liquid market, which is why reserve managers look first at government bonds from large economies. Our explainer on how central banks work describes why central banks keep reserves in the first place, and the ranking of countries with the most foreign exchange reserves shows who holds the largest stockpiles.

How the dollar got here

Before 1944: sterling's era

Before the 1940s the British pound had been the leading international currency, supported by the reach of the British Empire and the depth of London's financial markets. The two world wars drained Britain's finances and shifted economic weight to the United States.

1944: Bretton Woods

In July 1944, delegates from 44 nations met at the Mount Washington Hotel in Bretton Woods, New Hampshire, to design the postwar monetary order. The British economist John Maynard Keynes proposed a global "Clearing Union" with a new currency called the bancor. The American Harry Dexter White proposed a smaller stabilization fund. The adopted plan resembled White's, with some concessions to Keynes (Federal Reserve History).

The system fixed currencies to the dollar, "fixed but adjustable (within a 1 percent band)," and fixed the dollar to gold at $35 an ounce. Two institutions, the International Monetary Fund and the International Bank for Reconstruction and Development (now the World Bank), were created to support it. The IMF formally began in December 1945, and the system became fully functional in 1958 when currencies became convertible. The US State Department's historian describes the arrangement as "centered on the U.S. dollar and gold" (Office of the Historian).

The Triffin dilemma

Belgian-American economist Robert Triffin identified a built-in contradiction. A country that issues the world's reserve currency must supply it to the world, which nominally requires running deficits. But persistent deficits erode confidence that the currency can be exchanged for what backs it. The Federal Reserve's history puts the result plainly: "Eventually, there were more foreign-held dollars than the United States had gold."

August 15, 1971: the gold window closes

Between August 13 and 15, 1971, President Nixon and about 15 advisers met at Camp David. On the evening of August 15 he addressed the nation on a new economic policy. Foreign governments could no longer redeem dollars for gold, which turned the system into a fiat arrangement. The package also included a 90-day wage and price freeze and a 10% import surcharge. The Smithsonian Agreement tried to hold exchange rates in place a few months later, but the Bretton Woods system ended soon after (Federal Reserve History).

With gold no longer behind it, the dollar could have lost its standing. It did not, and that outcome is the central puzzle of this article.

The petrodollar: what is solid and what is folklore

The "petrodollar" story is often told as a simple deal: the United States agreed to protect Saudi Arabia, and in return oil was sold only in dollars. The details are murkier than the slogan.

What the record supports is more modest. Arab oil producers imposed an embargo during the 1973 Arab-Israeli War that lasted until March 1974 and sent oil prices sharply higher, according to the State Department historian. After 1973 oil exporters ran large surpluses. Wikipedia's survey of the literature reports that OPEC members' combined current account surplus reached $450 billion between 1974 and 1981 and that Arab petrodollars in that surge went largely into US Treasury securities. Dollar pricing for oil became standard in practice.

What is contested is how much this mattered. The same survey notes that critics, citing economists including Dean Baker and Ben Bernanke, argue that dollar settlement of oil adds only a tiny fraction to overall dollar demand. Other writers, such as William R. Clark in his 2005 book Petrodollar Warfare, argue the opposite and see oil pricing as a pillar of US power. The sources reviewed for this article do not document a formal legal requirement that oil be priced in dollars, so the safest summary is that oil is mostly invoiced in dollars through habit and market structure, and that its weight in explaining dollar dominance is debated.

Much of the dollar's demand comes from financial transactions rather than from commodity trade. The BIS survey's $9.6 trillion of daily FX turnover is a financial flow, and the dollar sits on one side of nearly all of it. Our explainer on which countries export the most oil shows how the commodity side of the story is distributed.

Why dominance persists

Network effects, one more time

Using a currency is cheaper when everyone else does. Firms quote prices in dollars because their customers and competitors do. Banks hold dollars because borrowers need them. Borrowers take dollar loans because lenders have dollars. Each choice reinforces the others, and no single participant gains by leaving alone.

The Treasury market and the rule of law

The Federal Reserve note attributes the dollar's role to the size, stability, and openness of the US economy, together with strong property rights and the rule of law. It also says the dollar's international usage far exceeds the US share of world GDP and trade. Gross domestic product tells the same story from the other side: using World Bank data in current US dollars, the US share of world GDP was about 39.6% in 1960, 35.7% in 1970, 24.9% in 1980, 30.2% in 2000, 22.5% in 2010, and 26.2% in 2024 (World Bank API). In other words, the currency's role is much larger than the economy that issues it. For context on the economy behind the currency, see our overview of the largest economies by GDP.

A lender of last resort for dollars

Foreign banks and firms hold large dollar debts, and in a crisis they need dollars quickly. The Federal Reserve created temporary dollar swap lines with other central banks during the 2008 to 2009 crisis, made a subset permanent in 2013, and expanded them again in 2020. Usage peaked at $585 billion in 2008 to 2009 and $450 billion in 2020, according to the Fed note. Knowing that dollar funding is available in a panic makes holding dollar assets safer, which is an advantage no rival currency can currently match.

Stablecoins extend the dollar's reach

The Fed note observes that about 99% of stablecoin market capitalization is linked to the dollar. Stablecoins are crypto tokens designed to hold a steady value, and their growth could deepen dollar use in places where people lack easy access to dollar accounts. Stablecoins are a different design from Bitcoin, which has no issuer and no peg.

The exorbitant privilege, and its price

French Finance Minister Valéry Giscard d'Estaing coined the phrase "exorbitant privilege" in the 1960s to describe what the dollar's role gave the United States. Economist Barry Eichengreen's 2011 book of the same name popularized it, illustrating the imbalance by noting that producing a $100 bill costs only a few cents, while others must supply $100 of goods to obtain one (Wikipedia summary).

The commonly cited benefits are:

• Cheaper borrowing. US safe assets, mainly government debt, tend to sell at higher prices (lower yields) than other governments' debt, which lets the United States borrow more easily.
• Currency risk sits abroad. The United States borrows in its own currency, so it does not face the exchange-rate shocks that hit countries with dollar debts.
• Sanctions reach. Because dollar payments pass through US institutions, Washington can restrict access to them.

The sources reviewed for this article do not report a reliable single estimate of the annual interest savings, so none is given here. Economists disagree about its size.

The cost side is the Triffin problem in modern form. Supplying the world with safe dollar assets means other countries' savings flow into the US, which can contribute to persistent trade deficits and a currency that may stay stronger than American exporters would like. The Fed note adds a security dimension: citing a 2022 study by Weiss, it reports that about three-quarters of foreign government holdings of safe US assets are in countries with some military ties to the United States. The privilege is therefore partly geopolitical and partly economic.

De-dollarization: what is actually happening

"De-dollarization" is used for several different things, so it helps to separate them.

The reserve share has fallen, slowly

The dollar's share of official reserves fell from 72% in 2001 to 58% in 2024, and has been essentially unchanged since 2022, according to the Federal Reserve. That is roughly where it stood in 1995. The note says the decline mainly reflects reserve managers diversifying into smaller currencies such as the Australian and Canadian dollars, not a wholesale move into a single rival. The IMF's COFER database, which publishes quarterly data on reserve currency composition, showed total reserves of $13.0 trillion in the third quarter of 2025 and carries more recent updates.

Gold looks bigger, mostly because of price

The Fed note reports that gold's share of official reserves rose from below 10% in 2015 to over 23%. But most of that increase came from gold's price, which rose more than 200%, while physical gold holdings grew by less than 10%. The note cites research finding that gold purchases are generally not linked to falls in dollar reserves, with exceptions for China, Russia, and Turkey. Our ranking of countries with the largest gold reserves shows who holds the most.

The Russia reserve freeze

On February 28, 2022, shortly after Russia's invasion of Ukraine, the Central Bank of Russia was blocked from accessing about $300 billion of foreign exchange reserves held abroad, according to Wikipedia's summary of reporting by Reuters, the Financial Times, and others. That was about half of the roughly $612 billion in foreign currency and gold reserves Russia held at the time. Wikipedia reports that most of the frozen assets sit in Europe, with the United States holding only about $5 billion.

Two details are worth separating. First, the freeze mostly involved European institutions, not only American ones, so it is not strictly a "dollar" story. Second, SWIFT, the messaging network that banks use to send payment instructions, is a Belgium-based cooperative, and, according to Wikipedia's summary, the decision to expel many Russian banks from it came out of negotiations among European nations rather than US law. The dollar's own sanctions power comes from the fact that dollar payments ultimately settle through US banks, which is why the US Treasury's Office of Foreign Assets Control could prohibit US persons from dealing with the Russian central bank the same day.

The Fed note says some commentators predicted the sanctions would make the dollar less attractive. It finds that this has not happened "so far," with no notable reallocation out of dollars. It adds that geopolitical rivals lack attractive alternatives because the euro, yen, and pound are all issued by US allies.

China's payment system

China's Cross-Border Interbank Payment System (CIPS) began operating on October 8, 2015. As of June 2025 it had 176 direct and 1,514 indirect participants, according to Wikipedia's summary of the system, and it processed about 175.49 trillion yuan in 2024. The same source notes that CIPS relies on SWIFT's messaging service for over 80% of its transactions, so it is an alternative settlement route rather than a complete escape from the existing network.

BRICS

The BRICS group began as Brazil, Russia, India, and China, with South Africa joining later. Wikipedia reports it grew from five to nine members in January 2024 when Egypt, Ethiopia, Iran, and the United Arab Emirates joined, and that Indonesia became the tenth on January 6, 2025. Saudi Arabia's status remains disputed. After a 2009 summit the members called for a "diverse, stable and predictable" international reserve currency, and in 2014 they signed a reserve currency pool worth over $100 billion. Using national currencies for trade is a recurring agenda item.

What the sources do not show is an operating common currency. The members have very different economies and political systems, and a shared currency would need shared monetary and fiscal institutions, which they do not have. The more realistic project is settling more bilateral trade in national currencies, which reduces dollar use at the margin without replacing it.

Why the alternatives struggle

Candidate	Strengths	Obstacles
Euro	Large economy; about 20% of reserves; deep markets	Fragmented sovereign debt market without a single fiscal authority issuing one safe asset. ECB's June 2026 report says its international role "grew moderately in 2025" but warns of growing fragmentation
Chinese renminbi	Large trade volume; state backing for payment infrastructure	About 2% of reserves in 2024; the Fed note says it is not freely exchangeable, China's capital account is not open, and investor confidence in Chinese institutions is relatively low
Japanese yen and British pound	Established markets; issued by US allies	Smaller economies; index scores of about 7 and about 6 versus the dollar's 65 to 70
Gold	No issuer; no sanctions risk	Does not pay interest; not a medium of exchange; physical holdings grew less than 10% while its price rose more than 200%
Crypto assets	Outside any government	Fed note: about 99% of stablecoin value is dollar-linked, so much of the crypto sector extends the dollar

The renminbi's problem is worth a closer look because it is a structural one. A currency can only become a store of value for foreigners if they can move money in and out of it freely, and if they trust the courts and institutions that stand behind it. Capital controls restrict the first, and the second takes decades to earn. Economists describe a "trilemma": a country cannot simultaneously have a fixed or managed exchange rate, free capital movement, and independent monetary policy. Opening the capital account would mean giving up one of the other two.

The euro faces a different kind of limit. A reserve manager wants a deep pool of safe bonds. The United States issues one Treasury market, while the euro area issues debt through its member governments, each with its own credit standing. That makes the euro's safe-asset supply smaller and more fragmented than it appears from the GDP of the area.

Our explainers on how bond prices move with interest rates and which countries carry the highest national debt give useful background on why the "safe asset" question matters.

Scenarios, and what would make them more likely

No one can forecast currency regimes with confidence. The scenarios below are a way of organizing the arguments, not predictions.

Scenario	What it would look like	Evidence to watch
Continued dominance	Dollar share of reserves stays near 58%; FX share stays near 89%	BIS triennial surveys; IMF COFER quarterly data
Gradual multipolarity	Dollar share drifts lower as reserve managers add smaller currencies and gold	Reserve share trending below the 2022 to 2024 level; renminbi use rising from about 2%
Policy-driven erosion	Heavy use of sanctions or fiscal strain pushes holders to diversify	Foreign share of Treasuries (32% in early 2025) falling faster; changes in Treasury auction demand
Sudden replacement	A rival offers a safer, deeper market	No current candidate meets the tests above

The Federal Reserve note cautions that its international-usage data lag, so it does not capture effects from 2025 tariff changes or the Moody's downgrade of US debt. The 2025 and later data are therefore the evidence to watch. For the macro side of fiscal strain, see our explainer on how inflation works.

What this means for ordinary people

Reserve status is abstract until it shows up in daily life. Three channels are commonly discussed, and each should be read as a general tendency rather than a prediction for any household.

• Interest rates. If foreign demand for Treasuries lowers US borrowing costs, it can feed through to rates on other loans. If that demand weakened, borrowing costs could rise. Our explainer on how interest rates affect the economy covers the mechanics.
• Exchange rates and import prices. A weaker dollar makes imports more expensive for US buyers and US exports cheaper abroad. Why exchange rates change explains the drivers.
• Everyday transactions abroad. For people in countries with unstable currencies, the dollar functions as a store of value, which our piece on why currencies lose value discusses.

None of this is a reason to buy or sell any asset, and the effects depend heavily on personal circumstances.

Common misconceptions

"The dollar is backed by oil." Oil is mostly invoiced in dollars, but the dollar is not backed by oil or any commodity. Since 1971 it has been a fiat currency. Economists debate how much oil pricing contributes to dollar demand.

"The dollar is about to collapse." The data in this article point to a slow decline in the dollar's share of reserves from its 2001 peak, with no notable reallocation out of dollars after 2022, per the Federal Reserve. Anything faster would require a credible alternative.

"Sanctions are the same as the dollar." The reserve freeze in 2022 involved mostly European-held assets, and the SWIFT decision came out of European negotiations. The dollar's sanctions power rests on US-based clearing, which is related but not identical.

"Gold buying proves central banks are abandoning the dollar." The Fed note finds that gold's share rose mainly because of its price and that gold purchases are generally not linked to falls in dollar reserves.

"A strong dollar is always good for America." It makes imports cheaper and foreign travel easier for Americans and also makes US exports more expensive abroad. The effects are mixed and fall unevenly across industries.

Frequently asked questions

Q: Why can't gold replace the dollar as the reserve asset? A: Gold has no issuer, but it pays no interest, is hard to move for everyday payments, and its supply is not designed to match growing trade. The Fed note shows gold's share of reserves has risen sharply, but mostly through price increases. Gold works well as a store of value for some reserve managers and poorly as a currency for daily trade.

Q: Would losing reserve status be bad for the US? A: It depends on how it happened and on what replaced it. The United States would lose some of the borrowing advantages described above. It would also be relieved of the Triffin-style burden of supplying the world with dollar assets. Economists disagree on the net effect, and the answer for any particular household would depend on interest rates, prices, and employment.

Q: What are financial sanctions and how do they use the dollar? A: Sanctions are legal restrictions on dealing with specific countries, firms, or individuals. When a transaction is denominated in dollars it generally settles through US banks, which gives the US government legal reach over it. Messaging networks like SWIFT are separate and are Belgium-based. The 2022 Russia measures combined US actions, such as barring US persons from dealing with the Central Bank of Russia, with European decisions on frozen assets and SWIFT.

Q: Is the euro a viable alternative? A: The euro is the second most used reserve currency, at about 20% of reserves, and it reaches 66% of trade invoicing in Europe. Its main limit is the structure of the euro area's debt market, which lacks a single issuer of the largest safe asset. The ECB's 2026 report says the euro's role grew moderately in 2025 and flags rising fragmentation in the monetary system.

Q: Can BRICS create a currency to replace the dollar? A: The sources reviewed here describe goals and proposals, such as a 2014 reserve pool of over $100 billion and a call for a new reserve currency in 2009, but not an operating common currency. A shared currency would require the members to coordinate monetary policy, and their economies and politics differ widely. Settling trade in national currencies is more feasible than a single common money.

Q: How does the dollar's share in reserves compare with the past? A: It was 72% in 2001 and 58% in 2024, which is roughly where it stood in 1995, according to the Federal Reserve. The share has been essentially unchanged since 2022.

The bottom line

The dollar's role is the result of 80 years of accumulated habit, deep Treasury markets, legal trust, and liquidity support in a crisis, not one policy that can be reversed with another. That explains why ending gold convertibility in 1971 did not end dollar dominance and why the 2022 sanctions did not prompt a measurable rush for the exits.

The trends are real, though modest. The reserve share has fallen from its 2001 peak, central banks hold more gold, and several countries are building alternative payment routes. The more useful question than "will the dollar be replaced?" is "what would a rival need?" Based on the evidence above: a deep and open bond market, free capital movement, institutions that foreign holders trust, and a lender of last resort. No candidate currently offers all four.

Related Reading

• Why Gold Is So Expensive — The Chemistry and Economics Behind the World's Most Coveted Metal
• What Is Inflation — and Why Prices Keep Rising?
• What Is Compound Interest — and Why It Matters So Much
• What Is Bitcoin — and How Does It Actually Work?
• What Is a Recession — and How Bad Can They Actually Get?

Sources

• Federal Reserve Board, The International Role of the U.S. Dollar, 2025 Edition (FEDS Notes, July 18, 2025)
• Bank for International Settlements, Triennial Central Bank Survey, April 2025, FX turnover
• Federal Reserve History, Creation of the Bretton Woods System and Nixon Ends Convertibility of U.S. Dollars to Gold
• U.S. Department of State, Office of the Historian, Bretton Woods-GATT, 1941-1947 and Oil Embargo, 1973-1974
• World Bank, GDP (current US$) data via API
• European Central Bank, The international role of the euro
• International Monetary Fund, COFER: Currency Composition of Official Foreign Exchange Reserves
• Wikipedia, Exorbitant privilege, Petrodollar recycling, International sanctions during the Russian invasion of Ukraine, Cross-Border Interbank Payment System, BRICS, and Triffin dilemma. Used as secondary summaries of the reporting cited in the text.