LIBOR: What It Is, How It Worked & Why It Was Replaced
How LIBOR Worked
Every business day, a panel of major banks submitted the interest rates at which they believed they could borrow from other banks. The Intercontinental Exchange (ICE) collected these submissions, discarded the highest and lowest quartiles, and averaged the rest to produce the daily LIBOR rate.
LIBOR was published in five currencies (USD, GBP, EUR, JPY, CHF) and seven maturities (overnight, one week, and one through six months). That gave 35 different rates every day. The most widely referenced was the 3-month USD LIBOR.
What LIBOR Was Used For
At its peak, LIBOR underpinned an estimated $350 trillion in financial contracts worldwide. It touched virtually every corner of the financial system:
| Product | How LIBOR Was Used |
|---|---|
| Adjustable-Rate Mortgages | Monthly rate resets tied to LIBOR + a fixed spread |
| Interest Rate Swaps | Floating leg of the swap referenced LIBOR |
| Corporate Bonds | Floating-rate notes priced at LIBOR + credit spread |
| Student Loans | Variable-rate loans indexed to LIBOR |
| Credit Facilities | Corporate credit lines priced off LIBOR |
The LIBOR Scandal
In 2012, regulators discovered that several major banks had been manipulating their LIBOR submissions for years. Traders at banks like Barclays, Deutsche Bank, and UBS colluded to push rates up or down to benefit their derivatives positions or to appear more financially stable during the 2008 crisis.
The fallout was massive: banks paid over $9 billion in fines, multiple traders faced criminal charges, and the scandal destroyed confidence in the benchmark. Regulators worldwide concluded that a rate based on subjective bank estimates — rather than actual transactions — was fundamentally flawed.
LIBOR vs. SOFR
| Feature | LIBOR | SOFR |
|---|---|---|
| Basis | Bank estimates of borrowing costs | Actual overnight Treasury repo transactions |
| Administrator | ICE Benchmark Administration | Federal Reserve Bank of New York |
| Credit Risk | Included bank credit risk premium | Nearly risk-free (backed by Treasuries) |
| Tenors | 7 maturities (overnight to 6 months) | Overnight only (term rates derived separately) |
| Transaction Volume | ~$500M daily in underlying trades | ~$1 trillion+ daily in repo transactions |
| Status | Discontinued (June 2023) | Active — primary USD benchmark |
The Transition Away from LIBOR
The Alternative Reference Rates Committee (ARRC), convened by the Federal Reserve, selected SOFR as the preferred replacement for USD LIBOR. The transition happened in phases:
New contracts began referencing SOFR starting in 2021. The remaining USD LIBOR settings were published for the last time on June 30, 2023. Legacy contracts that couldn’t be amended were shifted to SOFR-based fallback rates using a spread adjustment calculated by Bloomberg.
The transition required coordination across banks, asset managers, corporates, and regulators — one of the largest infrastructure changes in financial markets history.
Key Takeaways
- LIBOR was the world’s most important benchmark rate, underpinning $350+ trillion in contracts across bonds, loans, and derivatives.
- It was based on bank estimates — not actual transactions — which made it vulnerable to manipulation.
- The 2012 scandal led to billions in fines and a global push to replace LIBOR with transaction-based rates.
- SOFR replaced USD LIBOR, using actual overnight Treasury repo data for a more robust benchmark.
- Legacy LIBOR contracts transitioned to SOFR plus a credit spread adjustment after June 2023.
Frequently Asked Questions
What does LIBOR stand for?
LIBOR stands for London Interbank Offered Rate. It was the average rate at which major global banks said they could borrow from each other in the London interbank market.
Why was LIBOR discontinued?
LIBOR was discontinued because it relied on bank estimates rather than actual transactions, making it easy to manipulate. After the 2012 scandal revealed widespread rate-rigging, regulators pushed for transaction-based alternatives like SOFR.
What replaced LIBOR in the US?
SOFR (Secured Overnight Financing Rate) replaced LIBOR as the primary USD benchmark. It’s based on roughly $1 trillion in daily overnight Treasury repo transactions, making it far more robust than LIBOR.
How did the LIBOR scandal affect financial markets?
The scandal resulted in over $9 billion in regulatory fines, criminal prosecutions of individual traders, and a complete overhaul of global benchmark rate governance. It also accelerated the shift toward transaction-based reference rates worldwide.
Does LIBOR still exist in any form?
No. The last USD LIBOR rates were published on June 30, 2023. Legacy contracts that referenced LIBOR have transitioned to replacement rates — primarily SOFR with a credit spread adjustment — under fallback provisions mandated by regulators.