An interest rate swap (IRS) is a liquid financial derivative instrument in which two parties agree to exchange interest rate cash flows, based on a specified notional amount from a fixed rate to a floating rate (or vice versa) or from one floating rate to another.^{[1]} Interest rate swaps can be used for both hedging and speculating.
Contents

Structure 1

Types 2

Fixedforfloating rate swap, same currency 2.1

Floatingforfixed rate swap, same currency 2.2

Fixedforfloating rate swap, different currencies 2.3

Floatingforfixed rate swap, different currencies 2.4

Fixedforfixed rate swap, same currency 2.5

Floatingforfloating rate swap, same currency 2.6

Fixedforfixed rate swap, different currencies 2.7

Floatingforfloating rate swap, different currencies 2.8

Other variations 2.9

Uses 3

Speculation 3.1

British local authorities 3.2

Valuation and pricing 4

Risks 5

Market size 6

See also 7

References 8

External links 9
Structure
Party A is currently paying floating rate, but wants to pay fixed rate. Party B is currently paying fixed rate, but wants to pay floating rate. By entering into an interest rate swap, the net result is that each party can swap their existing obligation for their desired obligation.
In an interest rate swap, each counterparty agrees to pay either a fixed or floating rate denominated in a particular currency to the other counterparty. The fixed or floating rate is multiplied by a notional principal amount (say, $1 million) and an accrual factor given by the appropriate day count convention. When both legs are in the same currency, this notional amount is typically not exchanged between counterparties, but is used only for calculating the size of cashflows to be exchanged. When the legs are in different currencies, the respective notional amounts are typically exchanged at the start and the end of the swap, which is called cross currency interest rate swap.
The most common interest rate swap involves counterparty A paying a fixed rate (the swap rate) to counterparty B while receiving a floating rate indexed to a reference rate like LIBOR, EURIBOR, or MIBOR. By market convention, the counterparty paying the fixed rate is the "payer" (while receiving the floating rate), and the counterparty receiving the fixed rate is the "receiver" (while paying the floating rate).
A pays fixed rate to B (A receives floating rate)
B pays floating rate to A (B receives fixed rate)
Currently, A borrows from Market @ LIBOR +1.5%. B borrows from Market @ 8.5%.
Consider the following swap in which Party A agrees to pay Party B periodic fixed interest rate payments of 8.65% in exchange for periodic variable interest rate payments of LIBOR + 70 bps (0.70%) in the same currency. Note that there is no exchange of the principal amounts and that the interest rates are on a "notional" (i.e., imaginary) principal amount. Also note that interest payments are settled in net; that is, Party A pays (LIBOR + 1.50%)+8.65%  (LIBOR+0.70%) = 9.45% net. The fixed rate (8.65% in this example) is referred to as the swap rate.^{[2]}
At the point of initiation of the swap, the swap is priced so that it has a net present value of zero. If one party wants to pay 50 bps above the par swap rate, the other party has to pay approximately 50bps over LIBOR to compensate for this.
Types
Normally the parties do not swap payments directly, but rather each sets up a separate swap with a financial intermediary such as a bank. In return for matching the two parties together, the bank takes a spread from the swap payments (in this case 0.30% compared to the above example)
As OTC instruments, interest rate swaps can come in a number of varieties and can be structured to meet the specific needs of the counterparties. For example, the legs of the swap could be in same or different currencies; the notional of the swap could be amortized over time; reset dates (or fixing dates) of the floating rate could be irregular.
The interbank market, however, only has a few standardized types which are listed below. Each currency has its own standard market conventions regarding the frequency of payments, the day count conventions and the endofmonth rule.^{[3]}
Fixedforfloating rate swap, same currency
For example, if a company has a $10 million fixed rate loan at 5.3% paid monthly and a floating rate investment of JPY 1.2 billion that returns JPY 1M Libor +50bps every month, and wants to lock in the profit in USD as they expect the JPY 1M Libor to go down or USDJPY to go up (JPY depreciate against USD), then they may enter into a fixedforfloating swap in different currencies where the company pays floating JPY 1M Libor+50bps and receives 5.6% fixed rate, locking in 30bps profit against the interest rate and the FX exposure.
Floatingforfixed rate swap, same currency
Fixedforfloating rate swap, different currencies
Floatingforfixed rate swap, different currencies
Fixedforfixed rate swap, same currency
Floatingforfloating rate swap, same currency
Party P pays/receives floating interest in currency A indexed to X to receive/pay floating rate in currency A indexed to Y on a notional N for a tenure of T years. For example, you pay JPY 1M LIBOR monthly to receive JPY 1M TIBOR monthly on a notional JPY 1 billion for three years or you pay EUR 3M EURIBOR quarterly to receive EUR 6M EURIBOR semiannually. The second example, where the indexes are the same type but with different tenors, are the most liquid and most commonly traded same currency floatingforfloating swaps.
Floatingforfloating rate swaps are used to hedge against or speculate on the spread between the two indexes. For example, if a company has a floating rate loan at JPY 1M LIBOR and the company has an investment that returns JPY 1M TIBOR + 30bps and currently the JPY 1M TIBOR = JPY 1M LIBOR + 10bps. At the moment, this company has a net profit of 40bps. If the company thinks JPY 1M TIBOR is going to come down (relative to the LIBOR) or JPY 1M LIBOR is going to increase in the future (relative to the TIBOR) and wants to insulate from this risk, they can enter into a floatfloat swap in same currency where they pay, say, JPY TIBOR + 30bps and receive JPY LIBOR + 35bps. With this, they have effectively locked in a 35bit/s profit instead of running with a current 40bps gain and index risk. The 5bps difference (w.r.t. the current rate difference) comes from the swap cost which includes the market expectations of the future rate difference between these two indices and the bidoffer spread, which is the swap commission for the dealer.
Floatingforfloating rate swaps are also seen where both sides reference the same index, but on different payment dates, or use different business day conventions. This can be vital for assetliability management. An example would be swapping 3M LIBOR being paid with prior nonbusiness day convention, quarterly on JAJO (i.e., Jan, Apr, Jul, Oct) 30, into FMAN (i.e., Feb, May, Aug, Nov) 28 modified following.
Fixedforfixed rate swap, different currencies
Party P pays/receives fixed interest in currency A to receive/pay fixed rate in currency B for a term of T years. For example, you pay JPY 1.6% on a JPY notional of 1.2 billion and receive USD 5.36% on the USD equivalent notional of $10 million at an initial exchange rate of USDJPY 120.
Floatingforfloating rate swap, different currencies
Party P pays/receives floating interest in currency A indexed to X to receive/pay floating rate in currency B indexed to Y on a notional N at an initial exchange rate of FX for a tenure of T years. The notional is usually exchanged at the start and at the end of the swap. This is the most liquid type of swap with different currencies. For example, you pay floating USD 3M LIBOR on the USD notional 10 million quarterly to receive JPY 3M TIBOR quarterly on a JPY notional 1.2 billion (at an initial exchange rate of USDJPY 120) for 4 years; at the start you receive the notional in USD and pay the notional in JPY and at the end you pay back the same USD notional (10 million) and receive back the same JPY notional (1.2 billion).
For example, consider a U.S. company operating in Japan that needs JPY 10 billion to fund its Japanese growth. The easiest way to do this is to issue debt in Japan, but this may be expensive if the company is new in the Japanese market and lacking a good reputation among the Japanese investors. Additionally, the company may not have the appropriate debt issuance program in Japan or may lack a sophisticated treasury operation in Japan. The company could issue USD debt and convert to JPY on the FX market. This option solves the first problem, but it introduces two new risks:

FX risk: If this USDJPY spot goes up at the maturity of the debt, then when the company converts the JPY to USD to pay back its matured debt, it receives less USD and suffers a loss.

USD–JPY interest rate risk: If JPY rates come down, the return on the investment in Japan may also go down, introducing interest rate risk.
The FX risk can be hedged with longdated FX forward contracts, but this introduces yet another risk where the implied rate from the FX spot and the FX forward is a fixed but the JPY investment returns a floating rate. Although there are several alternatives to hedge both exposures effectively without introducing new risks, the easiest and most costeffective alternative is to use a floatingforfloating swap in different currencies.
Other variations
A number of other far less common variations are possible. Mostly tweaks are made to ensure that a bond is hedged "perfectly", so that all the interest payments received are exactly offset, which can lead to swaps where the principal is paid on one or more legs, rather than just interest (for example to hedge a coupon strip), or where the balance of the swap is automatically adjusted to match that of a prepaying bond like residential mortgagebacked securities.
Uses
Interest rate swaps are used to hedge against or speculate on changes in interest rates.
Speculation
Interest rate swaps are also used speculatively by hedge funds or other investors who expect a change in interest rates or the relationships between them. Traditionally, fixed income investors who expected rates to fall would purchase cash bonds, whose value increased as rates fell. Today, investors with a similar view could enter a floatingforfixed interest rate swap; as rates fall, investors would pay a lower floating rate in exchange for the same fixed rate.
Interest rate swaps are also popular for the arbitrage opportunities they provide. Varying levels of creditworthiness means that there is often a positive quality spread differential that allows both parties to benefit from an interest rate swap.
The interest rate swap market in USD is closely linked to the Eurodollar futures market which trades among others at the Chicago Mercantile Exchange.
British local authorities
In June 1988 the Audit Commission was tipped off by someone working on the swaps desk of Goldman Sachs that the London Borough of Hammersmith and Fulham had a massive exposure to interest rate swaps. When the commission contacted the council, the chief executive told them not to worry as "everybody knows that interest rates are going to fall"; the treasurer thought the interest rate swaps were a "nice little earner". The Commission's Controller, Howard Davies, realised that the council had put all of its positions on interest rates going down and ordered an investigation.
By January 1989 the Commission obtained legal opinions from two Queen's Counsel. Although they did not agree, the commission preferred the opinion which made it ultra vires for councils to engage in interest rate swaps. Moreover, interest rates had increased from 8% to 15%. The auditor and the commission then went to court and had the contracts declared illegal (appeals all the way up to the House of Lords failed in Hazell v Hammersmith and Fulham LBC); the five banks involved lost millions of pounds. Many other local authorities had been engaging in interest rate swaps in the 1980s.^{[4]} This resulted in several cases in which the banks generally lost their claims for compound interest on debts to councils, finalised in Westdeutsche Landesbank Girozentrale v Islington London Borough Council.^{[5]}
Valuation and pricing
The valuation of vanilla swaps was often done using the socalled textbook formulas using a unique curve in each currency. Some early literature described some incoherence introduced by that approach and multiple banks were using different techniques to reduce them. It became even more apparent with the 2007–2012 global financial crisis that the approach was not appropriate. The nowstandard pricing framework is the multicurves framework.
The present value of a plain vanilla (i.e., fixed rate for floating rate) swap can be computed by determining the present value (PV) of the fixed leg and the floating leg.
The value of the fixed leg is given by the present value of the fixed coupon payments known at the start of the swap, i.e.

PV_\text{fixed} = N \times C \times \sum_{i=1}^n \left( \tilde \delta_i \times P^D(\tilde t_i) \right)
where C is the swap rate, n is the number of fixed payments, N is the notional amount, \tilde \delta_i is the accrual factor according to the day count convention for the fixed rate period and P^D(\tilde t_i) is the discount factor for the payment time \tilde t_i.
The value of the floating leg is given by the present value of the floating coupon payments determined at the agreed dates of each payment. However, at the start of the swap, only the actual payment rates of the fixed leg are known in the future, whereas the forward rates are unknown. The forward rate for each floating payment date is calculated using the forward curves. The forward rate for the period [\tilde t_{j1}, t_j] with accrual factor \delta_i is given by

F_j = \frac{1}{\delta_j}\left( \frac{P^I(t_{j1})}{P^I(t_j)}  1 \right)
where I is the market index, such as USD LIBOR, and P^I(t_j) is the discount factor associated to the relevant forward curve. The value of the floating leg is given by the following:

PV_\text{float} = N \times \sum_{j=1}^m ( F_j \times \delta_j \times P^D(t_j) )
where m is the number of floating payments, \delta_i is the accrual factor according to the floating leg day count convention.
In the event that
P^D = P^I,
this formula simplifies to
PV_\text{float} = N \times ( 1  P^D(\tilde t_m) )
on the reset dates, since the summation in PV_\text{float} telescopes to the first and last terms only. On reset dates, the value of an offtherun swap (old issue) is given by
PV_\text{fixed}  PV_\text{float} = N \times (B_\text{eq}  1)
where B_\text{eq} is the value of hypothetical bond that mimics the fixed leg of the swap with a unit principal payable at expiry. On none reset dates the swap value becomes
PV_\text{fixed}  PV_\text{float} = N \times (B_\text{eq}  P^D(t_r))
where t_r is the nearest reset date. The fixed rate offered in the swap is the rate which values the fixed rates payments at the same PV as the variable rate payments using today's forward rates, i.e.:

C = \frac{PV_\text{float}}{\sum_{i=1}^n ( N \times \tilde\delta_i \times P^D(\tilde t_i))}^{[6]}
Therefore, at the time the contract is entered into, there is no advantage to either party, i.e.,

PV_\text{fixed} = PV_\text{float} \,
Thus, the swap requires no upfront payment from either party.
During the life of the swap the same valuation technique is used, but since, over time, both the discounting factors and the forward rates change, the PV of the swap will deviate from its initial value. Therefore, the swap will be an asset to one party and a liability to the other. The way these changes in value are reported is the subject of IAS 39 for jurisdictions following IFRS, and FAS 133 for U.S. GAAP. Swaps are marked to market by debt security traders to visualize their inventory at a certain time.
Risks
Interest rate swaps expose users to interest rate risk and credit risk.

Market risk: A typical swap consists of two legs—one fixed, the other floating. The risks of these two component will naturally differ. Newcomers to market finance may think that the risky component is the floating leg, since the underlying interest rate floats, and hence, is unknown. This first impression is wrong. The risky component is in fact the fixed leg and it is very easy to see why this is so.^{[7]}
(Comment: the above comment is not entirely accurate. Normally people will assume a hypothetical notional exchange at the end. After this hypothetical assumption, the swap can be understood as a floating rate bond vs a fixed rate bond. The risks on the floating bond side are small compared to the risks from the fixed rate bond side. However, without this hypothetical notional exchange at the end, purely the floating cash flow from the coupon payments will have higher risks than the cash flow from the fixed coupon payments. Both understanding have their merit and fully understand these two views are important to see the risks, particularly for floating floating swaps)
The discussion of pricing interest rate swaps illustrated an important point. Regardless of what happens to future Libor rates, the value of a rolling deposit or floating rate note (FRN) always equals the notional amount N at the reset dates. Between the reset dates this value may be different from N, but the discrepancy cannot be very large since the δ will be 3 or 6 months. Interest rate fluctuations have minimal effect on the values of fixed instruments with short maturities; in other words, the value of the floating leg changes very little during the life of a swap.
On the other hand, the fixed leg of a swap is equivalent to a coupon bond and fluctuations of the swap rate may have major effects on the value of the future fixed payments.

Credit risk on the swap comes into play if the swap is in the money or not. If one of the parties is in the money, then that party faces credit risk of possible default by another party. However, when the swap is negotiated through an intermediary financial institution, usually the intermediary assumes the default risk in exchange for a fixed percentage of the transaction (the bidask spread). In an intermediated swap, the two parties are not typically even aware of the identity of the second party to the transaction, making a quantification of the other party's credit risk not only irrelevant, but impossible.
Market size
On its December 2014 statistics release, the Bank for International Settlements reported that interest rate swaps were the largest component of the global OTC derivative market representing 60% of it, with the notional amount outstanding in OTC interest rate swaps of $381 trillion, and the gross market value of $14 trillion.^{[8]}
Interest rate swaps can be traded as an index through the FTSE MTIRS Index.
See also
References

^ "Interest Rate Swap". Glossary. ISDA.

^ "Interest Rate Swap" by Fiona Maclachlan, The Wolfram Demonstrations Project.

^ "Interest Rate Instruments and Market Conventions Guide" Quantitative Research, OpenGamma, 2012.

^ Duncan CampbellSmith, "Follow the Money: The Audit Commission, Public Money, and the Management of Public Services 19832008", Allen Lane, 2008, chapter 6 passim.

^ [1996] UKHL 12, [1996] AC 669

^ "Understanding interest rate swap math & pricing" (PDF). California Debt and Investment Advisory Commission. January 2007. Retrieved 20070927.

^ http://chicagofed.org/webpages/publications/understanding_derivatives/index.cfm

^ "OTC derivatives statistics at endDecember 2014" (PDF). Bank for International Settlements.

Pricing and Hedging Swaps, Miron P. & Swannell P., Euromoney books 1991
Early literature on the incoherence of the one curve pricing approach.

Interest rate parity, money market basis swaps and crosscurrency basis swaps, Tuckman B. and Porfirio P., Fixed income liquid markets research, Lehman Brothers, 2003.

Cross currency swap valuation, Boenkost W. and Schmidt W., Working Paper 2, HfB  Business School of Finance & Management, 2004. SSRN preprint.

The Irony in the Derivatives Discounting, Henrard M., Wilmott Magazine, pp. 92–98, July 2007. SSRN preprint.
Multicurves framework:

A multiquality model of interest rates, Kijima M., Tanaka K., and Wong T., Quantitative Finance, pages 133145, 2009.

Two Curves, One Price: Pricing & Hedging Interest Rate Derivatives Decoupling Forwarding and Discounting Yield Curves, Bianchetti M., Risk Magazine, August 2010. SSRN preprint.

The Irony in the Derivatives Discounting Part II: The Crisis, Henrard M., Wilmott Journal, Vol. 2, pp. 301–316, 2010. SSRN preprint.
External links

Understanding Derivatives: Markets and Infrastructure Federal Reserve Bank of Chicago, Financial Markets Group

Bank for International Settlements  Semiannual OTC derivatives statistics

Glossary  Interest rate swap glossary

Investopedia  Spreadlock  An interest rate swap future (not an option)

Basic Fixed Income Derivative Hedging  Article on Financialedu.com.

Hussman Funds  Freight Trains and Steep Curves

Interest Rate Swap Calculator

Historical LIBOR Swaps data

"All about money rates in the world: Real estate interest rates", WorldwideInterestRates.com
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