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A swap is a
cash-settled
OTC
derivative under which
two counterparties exchange two streams of cash flows. It is called an
interest rate swap if both cash flow
streams are in the same currency and are defined as cash flow streams
that might be associated with some fixed income obligations.
The most popular interest rate swaps are
fixed-for-floating swaps under
which cash flows of a fixed rate loan are exchanged for those of a
floating rate loan. Among these, the most common use a 3-month or 6-month Libor rate (or Euribor, if the currency is the Euro)
as their floating rate. These are called
vanilla interest rate swaps.
There is also a liquid market for floating-floating interest rate
swaps—what are known as basis swaps.
To keep
things simple (and minimize
settlement risk), concurrent cash flows are
netted. In a typical arrangement. both loans have an initial payment (loan) of
principal, but
those net to 0. Both loans have a final return of the same principal, but
those also net to 0. Also, the periodic interest payments are generally
scheduled to occur on concurrent dates, so they too can be netted.
The principal amount is called the
notional amount of the swap.
Consider an example. Two banks enter into a vanilla
interest rate swap.
The term is four years. They agree to swap fixed rate
USD payments at
4.6% in exchange for 6-month USD Libor payments. At
the outset, the fixed rate payments are known. The first floating rate
payment is also known, but the ret will depend on future values of Libor. Exhibit 1 calculates the
swap payments under a hypothetical scenario for Libor rates over the life
of the swap. These are illustrated graphically in Exhibit 2.
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Time
(years) |
6-Month
Libor |
Fixed Rate Cash
Flows |
Floating Rate Cash
Flows |
Swap
Net Cash Flows |
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[1] |
[2] |
[3] |
[4] |
[3] – [4] |
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0.0 |
2.8 % |
–100.0 |
–100.0 |
0.0 |
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0.5 |
3.4 % |
2.3 |
1.4 |
0.9 |
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1.0 |
4.4 % |
2.3 |
1.7 |
0.6 |
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1.5 |
4.2 % |
2.3 |
2.2 |
0.1 |
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2.0 |
5.0 % |
2.3 |
2.1 |
0.2 |
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2.5 |
5.6 % |
2.3 |
2.5 |
–0.2 |
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3.0 |
5.2 % |
2.3 |
2.8 |
–0.5 |
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3.5 |
4.4 % |
2.3 |
2.6 |
–0.3 |
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4.0 |
3.8 % |
102.3 |
102.2 |
0.1 |
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Cash flows under a hypothetical four-year
vanilla swap. Fixed payments are based on a 4.6% semi-annual rate. Floating
payments are based on 6-month Libor. The initial Libor rate is known
to be 2.8% at the outset, so the swap's first payment is certain.
Subsequent Libor rates are not known at the outset. The last column
indicates cash flows to the receive-fixed party. Cash flows to the
receive-floating party are the negatives of these. All cash flows
are in millions of dollars. Note that the final Libor rate at 4.0
years is not used to calculate any of the swap's cash flows. Note
also how all USD 100MM principal payments net to zero. |
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Graphical presentation of the results in
Exhibit 1. Swap cash flows are indicated as those received by the
receive-fixed party. |
In addition to being the financial equivalent of an
exchange of loans, a vanilla fixed income swap is also mathematically
equivalent to a strip of
FRA's.
Interest rate swaps are used for many purposes. If a
corporation has borrowed money at a floating rate of interest but would
prefer to lock in a fixed rate, it can swap its floating rate payments
into fixed rate payments. This is
illustrated in Exhibit 3.
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By entering into a swap with a third
party, a corporation can convert floating rate payments into fixed
rate payments. |
Interest rate swaps can
also be used to speculate on interest rates. A trader who believes
that interest rates will rise could incur the expenses of
borrowing and then
shorting
bonds. A simpler and
less expensive solution would be to put on a pay-fixed swap.
Vanilla interest rate swaps are quoted in terms of the fixed rate to be
paid against the floating index. The fixed rate is usually quoted as an
absolute rate, so a quote of 4.3% against 3-month Libor would indicate
that the fixed rate would be 4.3% paid quarterly. The floating rate is
always "flat"—that is, any spreads are added or subtracted from the fixed
rate only. In USD markets, vanilla swaps are often quoted, not as an absolute
rate, but as the fixed rate's spread over the corresponding
Treasury
yield. In the interdealer market,
bid-ask spreads on vanilla interest
rate swaps are
typically one or two basis points.
The fixed rates on vanilla swaps are
called swap rates. The
swap curve is a
yield curve comprising swap
rates for different maturities of swap. Due to high
liquidity in the USD swap market,
the swap curve has emerged as an alternative to Treasuries as a benchmark
for USD interest rates at maturities exceeding a year.
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basis swap
A floating-for-floating interest rate or currency swap.
bond Securitized debt.
corporate bond
A bond issued by a corporation.
currency
swap A swap for the exchange of cash flow streams in two
different currencies.
derivative
instrument An instrument
that derives value from the value of some commodity, energy, or other financial
instrument.
fixed income
term structure Refers collectively to a spot curve, forward curve,
discount curve, yield curve or any other curve that describes the time value of
money.
floater
A fixed income instrument whose coupon fluctuates with some designated reference
rate.
forward rate agreement
A cash-settled forward contract on a short-term loan.
interest rate
cap A derivative instrument which is linked
to interest rates.
interest rate spreads
Spreads between interest rates.
international
bond Any bond issued or invested in across national boarders.
swap
An OTC derivative under which two counterparties exchange two cash
flow streams.
swaption An option on a swap.
Treasury
security
US Federal Government debt obligation issued by the Department of Treasury. |
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Kolb (2002)
is a practical introduction to swaps and other derivatives.
Fabozzi, Mann and Choudhry (2002)
and Walmsley (2000)
discuss interest rate swaps in the context of the money markets.
James and Webber (1998)
provide a practical financial engineering perspective. For a
comprehensive treatment of swap markets, see Das (2003).
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