An anchor currency is the foreign currency, or basket of currencies, against which a country fixes or manages the value of its own money. A central bank that runs a currency peg promises to keep its exchange rate at, or close to, a stated level against that anchor, and it buys or sells reserves to keep that promise.
The US dollar is the most common anchor, followed by the euro. The anchor should not be confused with a reserve currency, which is any currency central banks hold as savings, although the dollar plays both roles. It also differs from full dollarization, where a country drops its own money and uses the foreign one outright. The International Monetary Fund records each member's anchor in its annual survey of exchange arrangements.
Anchor currency in plain terms
Think of a small boat tied to a large ship. When the sea is rough, the boat rocks less because it moves with the ship rather than on its own. A small economy that ties its currency to a big, stable one gains the same kind of steadiness: importers, exporters and savers know roughly what the money will be worth next month.
The rope has a price. Wherever the ship goes, the boat must follow, even if the captain of the boat would have preferred another course. A country with an anchor currency accepts that its money will move in step with the anchor, and that it largely gives up steering its own interest rates.
How countries choose an anchor
The choice usually follows a country's economic ties. Common reasons include:
- Trade invoicing. Oil exporters such as Saudi Arabia, whose riyal has been fixed at 3.75 per dollar since 1986, sell a commodity priced in dollars.
- Regional integration. Countries close to the euro area, such as Denmark, peg to the euro; Bulgaria kept its lev fixed to the euro until it joined the euro area on 1 January 2026.
- Historical links. The CFA franc zones in West and Central Africa were tied to the French franc and moved to a fixed euro rate when the euro was introduced.
- Credibility. A country with a history of high inflation may borrow the anti-inflation record of a stronger central bank.
Single anchors and basket anchors
A single anchor is simple to explain and to verify. Hong Kong's Linked Exchange Rate System ties the Hong Kong dollar to the US dollar inside a narrow band, and it is run as a currency board, the strictest form of anchoring.
Other countries use a currency basket to spread the risk across several trading partners. Kuwait has pegged its dinar to an undisclosed basket since 2007, and Morocco's dirham is linked to a basket of euros and dollars. Singapore manages its dollar against a trade-weighted basket within an exchange-rate band instead of a fixed point. A basket can also be built from a composite unit such as the IMF's Special Drawing Rights.
History of anchoring
Under the classical gold standard, gold was the anchor, and currencies were linked to one another through their fixed gold prices. The Bretton Woods system after 1944 made the dollar the centre: other currencies were pegged to the dollar, and the dollar was convertible into gold for foreign governments at $35 an ounce. When the United States ended that convertibility in 1971, major currencies moved to floating, but many smaller economies kept anchoring to the dollar, the Deutsche Mark and, later, the euro.
Trade-offs and risks
Anchoring brings lower currency risk for trade and borrowing and can tame inflation. The cost is set out by the impossible trinity: with open capital flows and a fixed rate, a country loses monetary policy independence and must, in effect, import the anchor country's interest rates even when its own economy needs something different.
The arrangement also depends on reserves. If markets doubt that a central bank holds enough of the anchor currency, they may attack the peg, which can end in a currency crisis. Countries whose business cycle drifts away from the anchor's, or whose terms of trade swing sharply, face the greatest strain, which is why some have moved to a floating rate instead.
Changing or abandoning an anchor
Anchors are not permanent. Kuwait pegged its dinar to the dollar from January 2003, then returned to a basket in May 2007 after the dollar's fall pushed up import prices. China ended its tight dollar link in July 2005 and, from December 2015, began publishing an index of the renminbi against a basket of trading-partner currencies as a reference point. Bulgaria shows the opposite path: its currency board, set up in July 1997, first tied the lev to the Deutsche Mark, switched to the euro when the euro replaced the mark, and ended with euro adoption itself.
A switch is usually announced at a moment of calm, because changing the anchor during market stress can look like a disguised devaluation. Countries that leave an anchor altogether often adopt an inflation target to give markets a new point of reference.