Euro Overnight Index Average (EONIA)
The Euro Overnight Index Average (EONIA) was an essential overnight reference rate indicating the average rate at which European banks lend to each other in euros. Despite its significance as an interbank rate for one-day loans among European banks, EONIA was phased out in favor of the ESTER (Euro Short-Term Rate) in January 2022, following European regulatory reforms.
Primary Insights
EONIA served as a crucial benchmark reflecting the overnight lending rates among European banks. It was the interest rate applicable to one-day loans and was calculated based on transactions by 28 designated panel banks.
Transition to ESTER
As part of a broader regulatory overhaul within Europe, EONIA was replaced by the Euro Short-Term Rate (ESTER), aiming to provide a more comprehensive benchmark for the market.
Operational Mechanics of EONIA
As a daily reference rate, EONIA articulated the weighted average of unsecured overnight interbank lending within the EU and EFTA, derived from the activities of 28 panel banks under the supervision of the European Central Bank (ECB).
Rationale and Banking Reserves
Banks are mandated to hold a certain reserve to manage liquidity risks, leading to short-term borrowing needs met through the overnight rate, with EONIA representing this rate among Europe's leading banks.