Currency Composition of Official Foreign Exchange Reserves (COFER)

The currency composition of official foreign exchange reserves (COFER) is an IMF dataset that measures how much of the world’s central bank reserves are held in each currency — dollars, euros, yen, yuan, and others. It reveals whether central banks are diversifying away from the US dollar, whether emerging-market currencies are gaining acceptance, and which reserve-currency hierarchy shifts are underway.

What COFER Measures

Central banks and other official institutions (like sovereign wealth funds with reserve components) hold foreign exchange reserves — buffers of foreign currency, precious metals, and special drawing rights (SDRs) — to manage currency risk, finance imports, and provide firepower in balance-of-payments crises. COFER is the International Monetary Fund’s public catalogue of how those reserves are distributed.

Each quarter, the IMF publishes COFER data showing the global stock of allocated reserves broken down by currency. As of recent data, the US dollar accounts for roughly 60% of global reserves, the euro about 20%, the yen around 5%, and smaller allocations to sterling, the Swiss franc, the Chinese yuan, and a residual “other” category.

This distribution is not fixed. Over decades, reserve currency shares have shifted dramatically. In 1999, when COFER reporting began, the dollar was around 70% of reserves; the euro (then very new) was negligible; the yuan was essentially zero. Today the euro has grown, and the yuan — though still small — has begun to appear as central banks explicitly allocate to it. These movements matter because they reflect confidence and long-term policy choices by the world’s monetary authorities.

Why Central Banks Hold Multiple Currencies

A single central bank might hold 60% of reserves in US dollars, 20% in euros, 10% in yen, and 10% in other currencies or gold. Why diversify if the dollar is the safest?

First, diversification reduces currency risk. If a bank holds only dollars and the dollar appreciates sharply, the real purchasing power of reserves denominated in other currencies erodes. A euro-based importer, for instance, may find that dollar reserves are worth less in euro terms.

Second, diversification provides optionality. If a central bank needs to intervene to stabilize its own currency during a crisis, it benefits from holding a broad portfolio. A shock that weakens the euro might strengthen the dollar, allowing a European central bank to sell dollars and buy euros to support its currency.

Third, holding multiple reserve currencies hedges against any single currency becoming unusable — a tail risk but not zero. During extreme sanctions or political upheaval, even the US dollar could theoretically face restrictions. Diversification spreads that tail risk.

Finally, some central banks hold reserves in currencies tied to their major trading partners. An Asian exporter may hold significant yen or yuan reserves to match the currencies in which it does business.

Reading COFER Trends

The COFER dataset is a sensitive indicator of shifts in global finance. Several trends have become visible:

Dollar still dominant but plateauing. The dollar’s share of global reserves has held around 59–62% for the last decade, stable from much higher levels in the 1990s. This suggests the dollar retains exorbitant privilege but is not gaining ground.

Euro’s plateau. The euro launched in 1999 and quickly climbed to 25–30% of reserves by the mid-2000s, then stabilized around 18–22%. The eurozone’s debt crises and political uncertainty may have capped euro adoption, but it remains the second-most-held reserve currency.

Emerging-market currencies creeping up. The Chinese yuan has risen from zero to roughly 2–3% of global reserves over the past decade, reflecting Beijing’s push to internationalise the currency and central banks’ gradual acceptance of it as a legitimate reserve asset. The Indian rupee and others remain negligible but are watching their profile.

Gold steady. Not a currency, but often included in reserve analysis: gold has held roughly 10–12% of official reserves for decades, an insurance policy and alternative to fiat currencies.

Why Governments and Markets Watch COFER

Financial markets scrutinize COFER releases because reserve-currency shifts can foreshadow bigger geopolitical changes. If central banks were fleeing the dollar in large numbers, it would signal loss of confidence and could weaken the dollar on forex markets. Conversely, if a currency (say, the euro) were dropping sharply, it might trigger capital outflows or policy responses.

Policymakers use COFER data to benchmark their own reserve allocation decisions. If most peers are holding 15% of reserves in euros, a central bank holding only 5% may feel exposed to euro movements. COFER thus creates soft peer pressure toward convergence.

Academics and analysts use COFER to test theories about the international monetary system. The persistence of dollar dominance, despite relative US economic decline, is partly explained by the absence of viable alternatives — a concept related to exorbitant privilege and, historically, to debates over whether an international reserve currency like Keynes’s bancor might have prevented such concentration.

Limitations and Reporting Issues

COFER data is imperfect. Not all central banks report their full holdings; some report only unallocated reserves (listed as “other”). This means the true breakdown may differ from published figures. Additionally, COFER does not directly capture holdings in non-reserve currencies or offshore reserves held for operational rather than strategic purposes.

The dataset also lags real-time trading. A central bank might diversify its holdings weeks before the next COFER release, so quarterly data can miss short-term shifts.

Finally, COFER captures stock (the pile of reserves at a given moment) but not flow (the rate of accumulation or diversification). A central bank that stops accumulating dollars but continues to hold 70% of its reserves in dollars will appear unchanged in COFER, even though it is effectively diversifying at the margin.

Looking Ahead

COFER will likely continue to show gradual diversification as emerging-market currencies gain liquidity and as central banks seek to reduce concentration risk. However, the structural advantages of the US dollar — deep, liquid asset markets, rule of law, and network effects (everyone else holds dollars) — are sticky. Unless a coordinated alternative emerges (a possibility mooted by proposals for a supranational currency, echoing Keynes’s 1944 bancor concept), the dollar’s dominance is likely to persist, even if its share gradually declines.

COFER serves as the financial system’s seismograph: watch for sudden shifts, but expect inertia to dominate.

See also