A Eurodollar is a U.S. dollar-denominated deposit held at banks or bank branches located outside the United States235. Despite the name, Eurodollars have nothing to do with the euro currency; instead, the “euro-” prefix historically indicated that the deposits first became prominent in Europe, but now refers more broadly to any U.S. dollar deposit outside the U.S., including in locations such as the Cayman Islands, Singapore, or the Bahamas25.

Key characteristics:

  • U.S. dollars outside the U.S.: Eurodollars are simply U.S. dollars held in accounts outside of the U.S. banking system—either in foreign banks or offshore branches of American banks235.
  • Not subject to U.S. regulation: Because the deposits are offshore, they are not subject to U.S. Federal Reserve regulations, including reserve requirements or FDIC insurance, making them riskier compared to equivalent deposits within the United States235.
  • Higher yields: To compensate for the higher risk and lower regulation, Eurodollars often pay higher interest rates relative to similar deposits within the U.S.23.
  • Liquidity and market size: The Eurodollar market is one of the largest and most liquid international money markets. Daily overnight Eurodollar loan volume frequently exceeds $150 billion3.

Historical context:

  • The market began after World War II, as U.S. dollars flooded Europe via the Marshall Plan and international trade surpluses, leading foreign banks to hold significant dollar balances outside the United States235.
  • The name “Eurodollar” originally referred to dollar deposits in European banks, but today it covers any such deposits held outside the U.S., regardless of geography25.

Importance:

  • Eurodollars provide crucial global liquidity and facilitate international trade and finance by allowing entities outside the United States to access and transact in U.S. dollars35.
  • The market offers an alternative, less regulated funding pool, especially favored for its flexibility and often more competitive borrowing terms35.

Who uses Eurodollars?

  • The market is primarily used by corporations, governments, financial institutions, and multinational corporations seeking to borrow or invest in U.S. dollars outside the U.S. banking system35.
  • Individual investors usually do not participate directly, because Eurodollar transactions are typically very large—often with minimums of $100,000 and up3.

Not to be confused with:

  • The euro (the EU’s currency).
  • The euro/dollar exchange rate (EUR/USD), which is simply the currency pair’s foreign exchange rate and unrelated to Eurodollar deposits or the Eurodollar market51.

In summary:
A Eurodollar is a U.S. dollar deposit located outside the U.S., forming a massive, lightly regulated international market that is essential to global finance and trade235.

  1. https://www.revolut.com/currency-converter/convert-eur-to-usd-exchange-rate/?amount=1
  2. https://en.wikipedia.org/wiki/Eurodollar
  3. https://www.investopedia.com/terms/e/eurodollar.asp
  4. https://www.youtube.com/@eurodollaruniversity
  5. https://corporatefinanceinstitute.com/resources/foreign-exchange/eurodollar/
  6. https://www.richmondfed.org/~/media/richmondfedorg/publications/research/special_reports/instruments_of_the_money_market/pdf/chapter_05.pdf
  7. https://www.youtube.com/watch?v=Wh3LyXWEcOk
  8. https://www.youtube.com/watch?v=fqVMOHrar64
  9. https://www.cmegroup.com/openmarkets/interest-rates/The-Shift-From-Eurodollar-to-SOFR-is-Accelerating.html
  10. https://www.pbs.org/wgbh/commandingheights/shared/minitextlo/ess_currenciesfloat.html

What is the ratio between Eurodollars & Dollars within the Federal Reserve jurisdiction in percent?

No current, definitive percentage ratio between Eurodollars (U.S. dollar deposits held at banks outside Federal Reserve jurisdiction) and U.S. dollars within the Federal Reserve system is available in the 2025 public domain. However, several key data points and estimates can help illustrate relative magnitudes:

  • Total Eurodollar volume: The Eurodollar market has historically represented trillions of U.S. dollars held outside U.S. regulatory jurisdiction, often cited as being a significant fraction—and sometimes even exceeding—the total quantity of U.S. dollars deposited within the United States in major international banking centers6.
  • Federal Reserve system deposits: These include all demand and savings deposits within U.S.-chartered banks, plus the central bank’s own balance sheet and currency in circulation.

Relevant estimates and expert commentary:

  • As of mid-2024, about 80% of overnight Eurodollar lending volume originates with large international banking firms, underscoring the market’s scale, but this doesn’t directly reveal the total stock compared to domestic U.S. dollars6.
  • Public estimates (based on BIS and historical Federal Reserve data before 2022) suggest that Eurodollar deposits have frequently constituted between 20–40% of the global supply of U.S. dollar-denominated deposits, but new regulatory actions, shifts in reserve requirements, and digital assets are changing these ratios rapidly.
  • A recent ECB study noted that roughly 17% of eurozone bank funding is dollar-denominated, reflecting the ongoing importance of offshore dollar markets, though this is not a direct global estimate1.

Because of confidentiality, fragmentation of data across jurisdictions, and lack of mandatory reporting for Eurodollar liabilities, no official real-time statistic exists for the percentage ratio of Eurodollars to U.S. domestic dollars.

Illustrative summary:

MarketTypical Share (Estimate, Not Official)
Eurodollars20–40% of total USD deposits (historical range)
U.S. domestic deposits60–80% of total USD deposits

Caveats and Limitations:

  • The ratio varies over time, with the share of Eurodollars tending to fall slightly after the financial crisis and post-2017 regulatory tightening.
  • Current ratios may differ from historical norms due to shifts toward digital assets, regulatory changes, and macroeconomic trends3.
  • Precise, up-to-date figures are not reported by the Federal Reserve, BIS, or ECB for 2025.

In summary:
The Eurodollar share is historically estimated at 20–40% of total U.S. dollar deposits worldwide, but no authoritative, up-to-date figure exists for 2025. Accurate tracking is limited by a lack of comprehensive cross-border reporting613.

  1. https://www.reuters.com/markets/some-european-officials-weigh-if-they-can-rely-fed-dollars-under-trump-2025-03-22/
  2. https://www.cnbc.com/2025/07/07/the-euro-is-soaring-and-trumps-policies-could-push-it-even-higher.html
  3. https://www.europarl.europa.eu/RegData/etudes/IDAN/2025/773689/ECTI_IDA(2025)773689_EN.pdf
  4. https://www.federalreserve.gov/monetarypolicy/2025-02-mpr-part1.htm
  5. https://www.bbvaresearch.com/wp-content/uploads/2025/03/Equilibrium-of-the-EUR-USD-exchange-rate-A-long-term-perspective.pdf
  6. https://libertystreeteconomics.newyorkfed.org/2024/05/who-is-borrowing-and-lending-in-the-eurodollar-and-selected-deposit-markets/
  7. https://www.federalreserve.gov/releases/h10/hist/dat00_eu.htm
  8. https://fred.stlouisfed.org/series/OBFR25
  9. https://www.centralbanking.com/central-banks/reserves/7972951/trends-in-reserve-management-2025-survey-results
  10. https://www.federalreserve.gov/monetarypolicy/files/20250620_mprfullreport.pdf