Internationalization of currency is the process by which a national currency comes to be used outside the country that issues it, by foreign governments, companies, banks and investors. An internationalized currency is used to invoice and settle cross-border trade, to denominate loans and bonds sold to foreigners, to hold savings and official reserves, and as a reference point for other exchange rates. The more roles a currency plays abroad, and the deeper those roles go, the more internationalized it is.
The term describes a matter of degree rather than a formal status. It overlaps with, but is wider than, being a reserve currency, which refers only to central bank holdings. It also differs from dollarization, where residents of another country adopt a foreign currency at home, and from serving as an anchor currency to which other countries peg.
Internationalization of currency in plain terms
Think of a language. Every country has its own, but a few languages are spoken far beyond their home, because traders, travellers and diplomats find it convenient to share one. Once enough people use a language for business, newcomers learn it too, simply because everyone else already does.
Money works in a similar way. A Brazilian exporter selling coffee to Japan will often price the deal in US dollars, even though neither country uses dollars at home, because banks, shippers and buyers all understand dollars and can easily borrow, hedge and save in them. A currency becomes international when strangers choose it for their own dealings. That choice is hard to force: it depends on trust in the issuer, on open and deep financial markets, and on habit.
The roles an international currency plays
Economists usually sort the uses of an international currency by the three functions of money, split between private and official users:
- Unit of account. Firms invoice trade in it and commodities are priced in it; governments use it as a peg or a reference basket.
- Medium of exchange. Banks and companies settle cross-border payments in it, and central banks use it to intervene in currency markets.
- Store of value. Investors hold bonds and deposits in it, while central banks keep part of their foreign exchange reserves in it.
Offshore markets are a sign of advanced internationalization. The eurodollar market, in which dollar deposits are held and lent by banks outside the United States, grew from the 1950s and became a central source of global funding.
How internationalization is measured
No single number captures the concept, so analysts combine several indicators. The Bank for International Settlements (BIS) found in its April 2025 triennial survey that the United States dollar was on one side of about 89% of all foreign exchange trades, and that the renminbi's share had risen to 8.5% of turnover (each trade involves two currencies, so shares add up to 200%). IMF data on the currency composition of reserves put the dollar at about 57% of allocated reserves in the second quarter of 2026, with the euro around 21%. Other measures include the share of trade invoiced in a currency, the share of international bonds and loans denominated in it, and its share of messages on SWIFT.
The renminbi as a case study
China has pursued renminbi internationalization as a deliberate policy since 2009, when a pilot scheme first allowed selected firms to settle trade in yuan. The approach has been gradual because China still restricts capital flows. Its main building blocks are:
- Trade settlement. Cross-border RMB settlement was extended from pilot regions to the whole country in the early 2010s.
- Offshore centres. Hong Kong, London, Singapore and other cities host offshore RMB markets, served by designated RMB clearing banks.
- Payment infrastructure. The Cross-Border Interbank Payment System (CIPS), launched in October 2015, clears and settles yuan payments between banks inside and outside China.
- Swap lines. The People's Bank of China has signed bilateral central bank swap lines with more than 40 central banks, giving them access to yuan liquidity.
- Official recognition. The renminbi joined the basket of the Special Drawing Rights (SDR) on 1 October 2016.
Despite this progress, the renminbi's share of global reserves has stayed close to 2%, well below China's share of world trade, which most analysts attribute to capital controls and limited access for foreign investors.
Benefits, costs and preconditions
An issuer gains from internationalization. Its firms can trade and borrow without exchange rate risk, its government can borrow more cheaply because foreigners want its assets, and it earns seigniorage on currency held abroad. Critics of US dollar dominance have called this combination an "exorbitant privilege".
There are costs too. Strong foreign demand can push the exchange rate up and hurt exporters, and large foreign holdings make the issuer's financial system more exposed to sudden outflows. Its central bank also comes under pressure to act as a lender to the rest of the world in a crisis.
The usual preconditions are a large economy, stable inflation, the rule of law, full currency convertibility and deep, liquid bond markets that foreigners can enter and leave freely. Many countries move towards capital account liberalization partly to meet that last condition. Because of these demands, and because of network effects that favour whichever currency is already widely used, the ranking of international currencies tends to change slowly, often over decades.