LIBOR
London Interbank Offered Rate, the formerly dominant global benchmark for short-term interbank lending, now discontinued.
LIBOR (London Interbank Offered Rate) was the world's most widely referenced short-term interest rate benchmark, used as the pricing basis for an estimated $200–300 trillion of financial contracts globally including loans, mortgages, derivatives, bonds, and student loans. LIBOR represented the average rate at which major global banks estimated they could borrow unsecured funds from other banks in the London interbank market across different currencies and maturities (overnight, 1 month, 3 months, 6 months, 12 months).
LIBOR was administered by the British Bankers' Association (later the ICE Benchmark Administration) and was calculated daily based on submissions from a panel of major banks. It was published for five currencies: USD, EUR, GBP, JPY, and CHF.
The LIBOR scandal emerged in 2008–2012 when investigations revealed that panel banks had systematically manipulated their rate submissions to profit on derivative positions and to avoid signaling financial weakness during the 2008 financial crisis. Major banks paid billions in regulatory fines; individual traders were prosecuted. The scandal fundamentally undermined confidence in LIBOR's integrity.
Following the scandal, regulators globally embarked on a multi-year transition away from LIBOR to alternative reference rates based on actual transactions rather than bank estimates. In the U.S., SOFR (Secured Overnight Financing Rate) replaced USD LIBOR. In the UK, SONIA replaced GBP LIBOR. Most LIBOR rates were discontinued at end-2021 (non-USD) and mid-2023 (USD), though synthetic USD LIBOR settings continued temporarily for legacy contract runoff.
The LIBOR transition required massive contract remediation across all financial markets and remains an important topic in structured finance, derivatives, and legacy loan documentation.
FAQs
Why was LIBOR discontinued?
LIBOR was discontinued because the 2012 manipulation scandal destroyed its credibility as an objective market benchmark, and because the underlying interbank unsecured lending market it was supposed to measure had largely dried up after the 2008 financial crisis—leaving LIBOR as an 'expert judgment' rate with minimal transaction basis. Regulators, particularly the UK Financial Conduct Authority, determined that a benchmark based on actual market transactions rather than bank estimates would be more reliable and harder to manipulate. SOFR in the U.S. and SONIA in the UK replaced LIBOR with rates anchored in the deep, liquid repo and overnight lending markets respectively.
What happened to financial contracts that referenced LIBOR?
The LIBOR transition involved three categories of contracts: new contracts after 2021 were required to use SOFR or other replacements; legacy contracts with robust fallback language transitioned automatically per their contractual terms; and 'tough legacy' contracts lacking adequate fallback provisions required legislative or regulatory intervention. The U.S. Adjustable Interest Rate (LIBOR) Act and similar legislation in other jurisdictions provided a statutory mechanism to replace LIBOR references in tough legacy contracts with SOFR-based replacements, avoiding mass contract disputes.
How does SOFR differ from LIBOR structurally?
LIBOR was a forward-looking term rate representing where banks expected to borrow unsecured funds; it incorporated bank credit risk (risk that the bank borrowing might default). SOFR is a backward-looking overnight rate based on actual collateralized (secured) repo transactions; it reflects near-risk-free borrowing rates with minimal credit component. SOFR therefore tends to be lower than LIBOR was (no credit spread) and is published for overnight only (though term SOFR rates derived from futures markets are now available for 1-month and 3-month terms). This structural difference required spread adjustments when converting LIBOR contracts to SOFR.
Related Terms
SOFR
Secured Overnight Financing Rate, the primary U.S. replacement for LIBOR, based on overnight Treasury repo transactions.
Federal Funds Rate
Interest rate at which banks lend reserves to each other overnight, set by the Federal Reserve.
Prime Rate
Benchmark lending rate charged by banks to their most creditworthy customers, tracking the federal funds rate.
Credit Default Swap
Financial derivative transferring credit risk of a reference entity from protection buyer to protection seller.
