The London Inter-bank Offered Rate is an interest-rate average calculated from estimates submitted by the leading banks in London. Each bank estimates what it would be charged were it to borrow from other banks. The resulting rate is usually abbreviated to Libor (/ˈlaɪbɔːr/) or LIBOR, or more officially to ICE LIBOR (for Intercontinental Exchange Libor). It was formerly known as BBA Libor(for British Bankers' Association Libor or the trademark bba libor) before the responsibility for the administration was transferred to Intercontinental Exchange. It is the primary benchmark, along with the Euribor, for short-term interest rates around the world. However, Libor will not be published any more after end-2021, and market participants are strongly encouraged to transition to other risk-free rates. 
Libor rates are calculated for five currencies and seven borrowing periods ranging from overnight to one year and are published each business day by Thomson Reuters. Many financial institutions, mortgage lenders, and credit card agencies set their own rates relative to it. At least $350 trillion in derivatives and other financial products are tied to Libor.
In June 2012, multiple criminal settlements by Barclays Bank revealed significant fraud and collusion by member banks connected to the rate submissions, leading to the Libor scandal. The British Bankers' Association said on 25 September 2012 that it would transfer oversight of Libor to UK regulators, as proposed by Financial Services Authority managing director Martin Wheatley's independent review recommendations. Wheatley's review recommended that banks submitting rates to Libor must base them on actual inter-bank deposit market transactions and keep records of those transactions, that individual banks' Libor submissions be published after three months, and recommended criminal sanctions specifically for manipulation of benchmark interest rates. Financial institution customers may experience higher and more volatile borrowing and hedging costs after implementation of the recommended reforms. The UK government agreed to accept all of the Wheatley Review's recommendations and press for legislation implementing them.
Significant reforms, in line with the Wheatley Review, came into effect in 2013 and a new administrator took over in early 2014. The British government regulates Libor through criminal and regulatory laws passed by the Parliament. In particular, the Financial Services Act 2012 brings Libor under UK regulatory oversight and creates a criminal offence for knowingly or deliberately making false or misleading statements relating to benchmark-setting.
The London Interbank Offered Rate (LIBOR) came into widespread use in the 1970s as a reference interest rate for transactions in offshore Eurodollar markets. In 1984, it became apparent that an increasing number of banks were trading actively in a variety of relatively new market instruments, notably interest rate swaps, foreign currency options and forward rate agreements. While recognizing that such instruments brought more business and greater depth to the London Inter-bank market, bankers worried that future growth could be inhibited unless a measure of uniformity was introduced. In October 1984, the British Bankers' Association (BBA)—working with other parties, such as the Bank of England—established various working parties, which eventually culminated in the production of the BBA standard for interest rate swaps, or "BBAIRS" terms. Part of this standard included the fixing of BBA interest-settlement rates, the predecessor of BBA Libor. From 2 September 1985, the BBAIRS terms became standard market practice. BBA Libor fixings did not commence officially before 1 January 1986. Before that date, however, some rates were fixed for a trial period commencing in December 1984.
Member banks are international in scope, with more than sixty nations represented among its 223 members and 37 associated professional firms as of 2008. Seventeen banks for example currently contribute to the fixing of US Dollar Libor. The panel contains the following member banks:
Libor is widely used as a reference rate for many financial instruments in both financial markets and commercial fields. There are three major classifications of interest rate fixings instruments, including standard inter bank products, commercial field products, and hybrid products which often use Libor as their reference rate.
Standard interbank products:
Forward rate agreements
Interest rate futures, e.g. Eurodollar futures
Interest rate swaps
Overnight indexed swaps, e.g. Libor–OIS spread
Interest rate options, Interest rate cap and floor
Commercial field products:
Floating rate notes
Floating rate certificates of deposit
Variable rate mortgages
Range accrual notes
Step up callable notes
Target redemption notes
Hybrid perpetual notes
Collateralized mortgage obligations
Collateralized debt obligations
In the United States in 2008, around sixty percent of prime adjustable-rate mortgages and nearly all subprime mortgages were indexed to the US dollar Libor. In 2012, around 45 percent of prime adjustable rate mortgages and more than 80 percent of subprime mortgages were indexed to the Libor. American municipalities also borrowed around 75 percent of their money through financial products that were linked to the Libor. In the UK, the three-month British pound Libor is used for some mortgages—especially for those with adverse credit history. The Swiss franc Libor is also used by the Swiss National Bank as their reference rate for monetary policy.
The usual reference rate for euro denominated interest rate products, however, is the Euribor compiled by the European Banking Federation from a larger bank panel. A euro Libor does exist, but mainly, for continuity purposes in swap contracts dating back to pre-EMU times. The Libor is an estimate and is not intended in the binding contracts of a company. It is, however, specifically mentioned as a reference rate in the market standard International Swaps and Derivatives Association documentation, which are used by parties wishing to transact in over-the-counter interest rate derivatives.
Libor is defined as:
The rate at which an individual Contributor Panel bank could borrow funds, were it to do so by asking for and then accepting inter-bank offers in reasonable market size, just prior to 11.00 London time.
This definition is amplified as follows:
The rate which each bank submits must be formed from that bank’s perception of its cost of funds in the inter-bank market.
Contributions must represent rates formed in London and not elsewhere.
Contributions must be for the currency concerned, not the cost of producing one currency by borrowing in another currency and accessing the required currency via the foreign exchange markets.
The rates must be submitted by members of staff at a bank with primary responsibility for management of a bank’s cash, rather than a bank’s derivative book.
The definition of "funds" is: unsecured inter-bank cash or cash raised through primary issuance of inter-bank Certificates of Deposit.
Libor is calculated by the Intercontinental Exchange (ICE) and published by Refinitiv. It is an index that measures the cost of funds to large global banks operating in London financial markets or with London-based counterparties. Each day, the BBA surveys a panel of banks (18 major global banks for the USD Libor), asking the question, "At what rate could you borrow funds, were you to do so by asking for and then accepting interbank offers in a reasonable market size just prior to 11 am?" The BBA throws out the highest 4 and lowest 4 responses, and averages the remaining middle 10, yielding a 22% trimmed mean. The average is reported at 11:30 am.
Libor is actually a set of indexes. There are separate Libor rates reported for seven different maturities (length of time to repay a debt) for each of 5 currencies. The shortest maturity is overnight, the longest is one year. In the United States, many private contracts reference the three-month dollar Libor, which is the index resulting from asking the panel what rate they would pay to borrow dollars for three months.
In 1986, the Libor initially fixed rates for three currencies. These were the US dollar, British pound sterling and the Deutsche Mark. Over time this grew to sixteen currencies. After a number of these currencies in 2000 merged into the euro there remained ten currencies. Following reforms of 2013 Libor rates are calculated for 5 currencies.
Australian dollar (AUD)
Canadian dollar (CAD)
New Zealand dollar (NZD)
Danish krone (DKK)
Swedish krona (SEK)
Note that the Euro LIBOR should not be confused with EURIBOR.
Fixed rates in USD
There are different money markets in the world having interbank offered rate fixings in USD, including:
Libor fixed in London
Mibor, or MIBOR (Mumbai Interbank Offered Rate) fixed in India
Sibor, or SIBOR (Singapore Interbank Offered Rate) fixed in Singapore (USD SIBOR was discontinued on 1 Jan 2014.) 
Hibor, or HIBOR (Hong Kong Interbank Offered Rate) fixed in Hong Kong (USD HIBOR was discontinued on 1 April 2014.) 
Ciror, or CIROR (CFETSUSD Interbank Reference Offered Rate) fixed in Shanghai, China. (commencing on 3 Sep 2018)
The USD Libor in London is the most recognised and predominant one. The USD Sibor was established in January 1988, and the USD Hibor was launched in December 2006. Although these fixings in USD use similar methodology by fixing at 11:00 am at their local times, the results of the three fixings are different.
The Chicago Mercantile Exchange's Eurodollar contracts are based on three-month US dollar Libor rates. They are the world's most heavily traded short-term interest rate futures contracts and extend up to ten years. Shorter maturities trade on the Singapore Exchange in Asian time.
Interest rate swaps
Interest rate swaps based on short Libor rates currently trade on the interbank market for maturities up to 50 years. In the swap market a "five-year Libor" rate refers to the 5-year swap rate where the floating leg of the swap references 3- or 6-month Libor (this can be expressed more precisely as for example "5-year rate vs 6-month Libor"). "Libor + x basis points", when talking about a bond, means that the bond's cash flows have to be discounted on the swaps' zero-coupon yield curve shifted by x basis points to equal the bond's actual market price. The day count convention for Libor rates in interest rate swaps is Actual/360, except for the GBP currency for which it is Actual/365 (fixed).
Reliability and scandal
On Thursday, 29 May 2008, The Wall Street Journal (WSJ) released a controversial study suggesting that banks might have understated borrowing costs they reported for Libor during the 2008 credit crunch. Such under-reporting could have created an impression that banks could borrow from other banks more cheaply than they could in reality. It could also have made the banking system or specific contributing bank appear healthier than it was during the 2008 credit crunch. For example, the study found that rates at which one major bank (Citigroup) "said it could borrow dollars for three months were about 0.87 percentage point lower than the rate calculated using default-insurance data."
In September 2008, a former member of the Bank of England's Monetary Policy Committee, Willem Buiter, described Libor as "the rate at which banks don't lend to each other", and called for its replacement. The former Governor of the Bank of England, Mervyn King, later used the same description before the Treasury Select Committee.
To further bring this case to light, The Wall Street Journal reported in March 2011 that regulators were focusing on Bank of America Corp., Citigroup Inc. and UBS AG. Making a case would be very difficult because determining the Libor rate does not occur on an open exchange. According to people familiar with the situation, subpoenas were issued to the three banks.
In response to the study released by the WSJ, the British Bankers' Association announced that Libor continues to be reliable even in times of financial crisis. According to the British Bankers' Association, other proxies for financial health, such as the default-credit-insurance market, are not necessarily more sound than Libor at times of financial crisis, though they are more widely used in Latin America, especially the Ecuadorian and Bolivian markets.
Additionally, some other authorities contradicted the Wall Street Journal article. In its March 2008 Quarterly Review, The Bank for International Settlements has stated that "available data do not support the hypothesis that contributor banks manipulated their quotes to profit from positions based on fixings." Further, in October 2008 the International Monetary Fund published its regular Global Financial Stability Review which also found that "Although the integrity of the U.S. dollar Libor-fixing process has been questioned by some market participants and the financial press, it appears that U.S. dollar Libor remains an accurate measure of a typical creditworthy bank's marginal cost of unsecured U.S. dollar term funding."
On 27 July 2012, the Financial Times published an article by a former trader which stated that Libor manipulation had been common since at least 1991. Further reports on this have since come from the BBC and Reuters. On 28 November 2012, the Finance Committee of the Bundestag held a hearing to learn more about the issue.
In late September 2012, Barclays was fined £290m because of its attempts to manipulate the Libor, and other banks are under investigation of having acted similarly. Wheatley has now called for the British Bankers' Association to lose its power to determine Libor and for the FSA to be able to impose criminal sanctions as well as other changes in a ten-point overhaul plan.
On 28 September, Wheatley's independent review was published, recommending that an independent organisation with government and regulator representation, called the Tender Committee, manage the process of setting LIBOR under a new external oversight process for transparency and accountability. Banks that make submissions to LIBOR would be required to base them on actual inter-bank deposit market transactions and keep records of their transactions supporting those submissions. The review also recommended that individual banks' LIBOR submissions be published, but only after three months, to reduce the risk that they would be used as a measure of the submitting banks' creditworthiness. The review left open the possibility that regulators might compel additional banks to participate in submissions if an insufficient number do voluntarily. The review recommended criminal sanctions specifically for manipulation of benchmark interest rates such as the LIBOR, saying that existing criminal regulations for manipulation of financial instruments were inadequate. LIBOR rates may be higher and more volatile after implementation of these reforms, so financial institution customers may experience higher and more volatile borrowing and hedging costs. The UK government agreed to accept all of the Wheatley Review's recommendations and press for legislation implementing them.
On 28 February 2012, it was revealed that the US Department of Justice was conducting a criminal investigation into Libor abuse. Among the abuses being investigated were the possibility that traders were in direct communication with bankers before the rates were set, thus allowing them an advantage in predicting that day's fixing. Libor underpins approximately $350 trillion in derivatives. One trader's messages indicated that for each basis point (0.01%) that Libor was moved, those involved could net "about a couple of million dollars".
On 27 June 2012, Barclays Bank was fined $200m by the Commodity Futures Trading Commission, $160m by the United States Department of Justice and £59.5m by the Financial Services Authority for attempted manipulation of the Libor and Euribor rates. The United States Department of Justice and Barclays officially agreed that "the manipulation of the submissions affected the fixed rates on some occasions". On 2 July 2012, Marcus Agius, chairman of Barclays, resigned from the position following the interest rate rigging scandal. Bob Diamond, the chief executive officer of Barclays, resigned on 3 July 2012. Marcus Agius will fill his post until a replacement is found. Jerry del Missier, chief operating officer of Barclays, also resigned, as a casualty of the scandal. Del Missier subsequently admitted that he had instructed his subordinates to submit falsified LIBORs to the British Bankers Association.
By 4 July 2012 the breadth of the scandal was evident and became the topic of analysis on news and financial programs that attempted to explain the importance of the scandal. On 6 July, it was announced that the UK Serious Fraud Office had also opened a criminal investigation into the attempted manipulation of interest rates.
On 4 October 2012, Republican US Senators Chuck Grassley and Mark Kirk announced that they were investigating Treasury Secretary Tim Geithner for complicity with the rate manipulation scandal. They accused Geithner of knowledge of the rate-fixing, and inaction which contributed to litigation that "threatens to clog our courts with multi-billion dollar class action lawsuits" alleging that the manipulated rates harmed state, municipal and local governments. The senators said that an American-based interest rate index is a better alternative which they would take steps towards creating.
Early estimates are that the rate manipulation scandal cost US states, counties, and local governments at least $6 billion in fraudulent interest payments, above $4 billion that state and local governments have already had to spend to unwind their positions exposed to rate manipulation.
Alternatives for the USD LIBOR
Alternative Reference Rates Committee
In 2014 the U.S. Federal Reserve Board and the Federal Reserve Bank of New York announced the creation of the Alternative Rates Reference Committee (ARRC) to assess viable alternatives to the LIBOR.
In 2016 the ARRC released its first report on the possible indices that could serve as a replacement to the LIBOR.
On March 7, 2018 the ARRC announced that the committee had been reconstituted and the following groups were participating.
The ARRC will comprise the following institutions:
Bank of America
Federal National Mortgage Association
Federal Home Loan Mortgage Corporation
Government Finance Officers Association
International Swaps and Derivatives Association
JP Morgan Chase & Co.
National Association of Corporate Treasurers
Pacific Investment Management Company
The Federal Home Loan Bank of New York
The Independent Community Bankers of America
The Loan Syndications and Trading Association
The Securities Industry and Financial Markets Association
World Bank Group
In addition, the following agencies will serve as ex officio members of the ARRC:
Board of Governors of the Federal Reserve System
Consumer Financial Protection Bureau
Federal Deposit Insurance Corporation
Federal Housing Finance Agency
Federal Reserve Bank of New York
Office of Financial Research
Office of the Comptroller of the Currency
U.S. Commodity Futures Trading Commission
U.S. Securities and Exchange Commission
U.S. Treasury Department
Secured Overnight Financing Rate
In June 2017, the ARRC announced a broad Treasury repo financing rate, SOFR, as its recommended alternative to the USD LIBOR. In its justification for this choice the ARRC said:
SOFR is a fully transactions based rate that will have the widest coverage of any Treasury repo rate available and it will be published on a daily basis by the Federal Reserve Bank of New York beginning April 3, 2018. Because of its range of coverage, SOFR is a good representation of the general funding conditions of the overnight Treasury repo market. As such it will reflect an economic cost of lending and borrowing relevant to a wide array of market participants active in these markets, including broker dealers, money market funds, asset managers, insurance companies, securities lenders and pension funds.
Ameribor is a benchmark interest rate created by the American Financial Exchange. Ameribor reflects the actual borrowing costs of thousands of small, medium and regional banks across America, but it is also useful for larger banks and financial institutions that do business with these banks, as well as small and middle market companies. Ameribor has traded more than $550 billion since inception in 2015. In addition, the AFX launched Ameribor futures on August 16, 2019.
U.S. Dollar ICE Bank Yield Index
The U.S. Dollar ICE Bank Yield Index is an index proposed by Intercontinental Exchange Benchmark Administration (IBA) in January 2019 to measure the yields at which investors are willing to lend U.S. dollar funds to large, internationally active banks on a wholesale, unsecured basis over one-month, three-month and six-month periods. Its usage is intended to be similar to how Libor is currently used.
The administration of Libor has itself become a regulated activity overseen by the UK's Financial Conduct Authority. Furthermore, knowingly or deliberately making false or misleading statements in relation to benchmark-setting was made a criminal offence in UK law under the Financial Services Act 2012.
A new code of conduct, introduced by a new interim oversight committee, builds on this by outlining the systems and controls firms need to have in place around Libor. For example, each bank must now have a named person responsible for Libor, accountable if there is any wrongdoing. The banks must keep records so that they can be audited by the regulators if necessary.
On 13 November 2013, the Intercontinental Exchange (ICE) Group announced the successful completion of its acquisition of NYSE Euronext. As a result of this acquisition, NYSE Euronext Rate Administration Limited was renamed ICE Benchmark Administration Limited. The appointment of a new administrator is a major step forward in the reform of LIBOR.
On July 27, 2017 the Financial Conduct Authority, the U.K.'s top regulator, tasked with overseeing Libor, announced the benchmark will be phased out by 2021. Alternative risk-free rates are being set up for the different currencies. For the US Dollar, the US Fed's Alternative Reference Rates Committee (ARRC) has recommended using the Secured Overnight Financing Rate (SOFR), which is being published since April 2019 . For the British Pound, it is the Sterling Over Night Index Average (SONIA), and for the Euro the Euro Short-Term Rate (€STR).
Interbank lending market
Carrick Mollenkamp and Mark Whitehouse, "Study Casts Doubt on Key Rate: WSJ Analysis Suggests Banks May Have Reported Flawed Interest Data for Libor", The Wall Street Journal, Thursday, 29 May 2008, p. 1.
Donald MacKenzie, "What's in a Number?"  , London Review of Books, 25 September 2008, pp. 11–12.
Matt Taibbi: Everything Is Rigged: The Biggest Price-Fixing Scandal Ever  , Rolling Stone 25 April 2013