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Amortizing and Accreting
Swap Vaulation Pratical
Guide
Alan White
FinPricing
http://www.finpricing.com
Amortizing Swap
Summary
◆ Interest Rate Amortizing or Accreting Swap Introduction
◆ The Use of Amortizing or Accreting Swap
◆ Valuation
◆ Practical Notes
◆ A real world example
Amortizing Swap
Amortizing or Accreting Swap Introduction
◆ An amortizing swap is an interest rate swap whose notional principal
amount declines during the life of the contract
◆ An accreting swap is an interest rate swap whose notional principal
amount increases instead.
◆ The notional amount changes could be one leg or two legs, but typically
on a fixed schedule.
◆ The notional principal is tied to an underlying financial instrument with
a declining principal, such as a mortgage or an increasing principal,
such as a construction fund.
Amortizing Swap
The Use of Amortizing or Accreting Swap
◆ The notional principal of an amortizing swap is tied to an underlying
financial instrument with a declining principal, such as a mortgage.
◆ On the other hand, the notional amount of an accreting swap is tied to
an underlying instrument with an increasing principal, such as a
construction fund.
◆ The notional principal schedule of an amortizing or an accreting swap
may decrease or increase at the same rate as the underlying
instrument.
◆ Both amortizing and accreting swaps can be used to reduce or increase
exposure to fluctuations in interest rates.
Amortizing Swap
Valuation
◆ The analytics is similar to a vanilla interest rate swap but the principal
amount used by each period may be different.
◆ The present value of a fixed rate leg is given by
𝑃𝑉𝑓𝑖𝑥𝑒𝑑 𝑡 = 𝑅 𝑁𝑖 𝜏𝑖 𝐷𝑖
𝑛
𝑖=1
where t is the valuation date and 𝐷𝑖 = 𝐷(𝑡, 𝑇𝑖) is the discount factor.
◆ The present value of a floating leg is given by
𝑃𝑉𝑓𝑙𝑜𝑎𝑡 𝑡 = 𝑁𝑖 𝐹𝑖 + 𝑠 𝜏𝑖 𝐷𝑖
𝑛
𝑖=1
where 𝐹𝑖 =
𝐷 𝑖−1
𝐷 𝑖
− 1 /𝜏𝑖 is the simply compounded forward rate and s is the floating
spread.
Amortizing Swap
Valuation (Cont)
◆ The present value of an interest rate swap can expressed as
◆ From the fixed rate payer perspective, 𝑃𝑉 = 𝑃𝑉𝑓𝑙𝑜𝑎𝑡 − 𝑃𝑉𝑓𝑖𝑥𝑒𝑑
◆ From the fixed rate receiver perspective, 𝑃𝑉 = 𝑃𝑉𝑓𝑖𝑥𝑒𝑑 − 𝑃𝑉𝑓𝑙𝑜𝑎𝑡
Amortizing Swap
Practical Notes
◆ First of all, you need to generate accurate cash flows for each leg. The cash
flow generation is based on the start time, end time and payment frequency
of the leg, plus calendar (holidays), business convention (e.g., modified
following, following, etc.) and whether sticky month end.
◆ We assume that accrual periods are the same as reset periods and payment
dates are the same as accrual end dates in the above formulas for brevity.
But in fact, they are different due to different market conventions. For
example, index periods can overlap each other but swap cash flows are not
allowed to overlap.
◆ The accrual period is calculated according to the start date and end date of
a cash flow plus day count convention
Amortizing Swap
Practical Notes (Cont)
◆ The forward rate should be computed based on the reset period (index reset
date, index start date, index end date) that are determined by index
definition, such as index tenor and convention. it is simply compounded.
◆ Sometimes there is a floating spread added on the top of the floating rate in
the floating leg.
◆ The formula above doesn’t contain the last live reset cash flow whose reset
date is less than valuation date but payment date is greater than valuation
date. The reset value is
𝑃𝑉𝑟𝑒𝑠𝑒𝑡 = 𝑟0 𝑁𝜏0 𝐷0
where 𝑟0 is the reset rate.
Amortizing Swap
Practical Notes (Cont)
◆ The present value of the reset cash flow should be added into the present
value of the floating leg.
◆ Some dealers take bid-offer spreads into account. In this case, one should
use the bid curve constructed from bid quotes for forwarding and the offer
curve built from offer quotes for discounting.
Amortizing Swap
A Real World Example
Fixed Leg Specification Floating Leg Specification Notional Schedule
Currency USD Currency USD 6100520 9/1/2015
Day Count dcAct360 Day Count dcAct360 6075492 10/1/2015
Leg Type Fixed Leg Type Float 6050464 11/1/2015
Notional 6100520 Notional 6100520 6024284 12/1/2015
Pay Receive Receive Pay Receive Pay 5998104 1/1/2016
Payment Frequency 1M Payment Frequency 1M 5971924 2/1/2016
Start Date 9/1/2015 Start Date 9/1/2015 5945744 3/1/2016
End Date 4/3/2023 End Date 4/3/2023 5919564 4/1/2016
Fixed Rate 0.0245 Spread 0 5893384 5/1/2016
Index Specification 5867204 6/1/2016
Index Type LIBOR 5841024 7/1/2016
Index Tenor 1M 5814844 8/1/2016
Index DayCount dcAct360 5788664 9/1/2016
Thanks!

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Amortizing and Accreting Swap Valuation Introduction and Practical Guide

  • 1. Amortizing and Accreting Swap Vaulation Pratical Guide Alan White FinPricing http://www.finpricing.com
  • 2. Amortizing Swap Summary ◆ Interest Rate Amortizing or Accreting Swap Introduction ◆ The Use of Amortizing or Accreting Swap ◆ Valuation ◆ Practical Notes ◆ A real world example
  • 3. Amortizing Swap Amortizing or Accreting Swap Introduction ◆ An amortizing swap is an interest rate swap whose notional principal amount declines during the life of the contract ◆ An accreting swap is an interest rate swap whose notional principal amount increases instead. ◆ The notional amount changes could be one leg or two legs, but typically on a fixed schedule. ◆ The notional principal is tied to an underlying financial instrument with a declining principal, such as a mortgage or an increasing principal, such as a construction fund.
  • 4. Amortizing Swap The Use of Amortizing or Accreting Swap ◆ The notional principal of an amortizing swap is tied to an underlying financial instrument with a declining principal, such as a mortgage. ◆ On the other hand, the notional amount of an accreting swap is tied to an underlying instrument with an increasing principal, such as a construction fund. ◆ The notional principal schedule of an amortizing or an accreting swap may decrease or increase at the same rate as the underlying instrument. ◆ Both amortizing and accreting swaps can be used to reduce or increase exposure to fluctuations in interest rates.
  • 5. Amortizing Swap Valuation ◆ The analytics is similar to a vanilla interest rate swap but the principal amount used by each period may be different. ◆ The present value of a fixed rate leg is given by 𝑃𝑉𝑓𝑖𝑥𝑒𝑑 𝑡 = 𝑅 𝑁𝑖 𝜏𝑖 𝐷𝑖 𝑛 𝑖=1 where t is the valuation date and 𝐷𝑖 = 𝐷(𝑡, 𝑇𝑖) is the discount factor. ◆ The present value of a floating leg is given by 𝑃𝑉𝑓𝑙𝑜𝑎𝑡 𝑡 = 𝑁𝑖 𝐹𝑖 + 𝑠 𝜏𝑖 𝐷𝑖 𝑛 𝑖=1 where 𝐹𝑖 = 𝐷 𝑖−1 𝐷 𝑖 − 1 /𝜏𝑖 is the simply compounded forward rate and s is the floating spread.
  • 6. Amortizing Swap Valuation (Cont) ◆ The present value of an interest rate swap can expressed as ◆ From the fixed rate payer perspective, 𝑃𝑉 = 𝑃𝑉𝑓𝑙𝑜𝑎𝑡 − 𝑃𝑉𝑓𝑖𝑥𝑒𝑑 ◆ From the fixed rate receiver perspective, 𝑃𝑉 = 𝑃𝑉𝑓𝑖𝑥𝑒𝑑 − 𝑃𝑉𝑓𝑙𝑜𝑎𝑡
  • 7. Amortizing Swap Practical Notes ◆ First of all, you need to generate accurate cash flows for each leg. The cash flow generation is based on the start time, end time and payment frequency of the leg, plus calendar (holidays), business convention (e.g., modified following, following, etc.) and whether sticky month end. ◆ We assume that accrual periods are the same as reset periods and payment dates are the same as accrual end dates in the above formulas for brevity. But in fact, they are different due to different market conventions. For example, index periods can overlap each other but swap cash flows are not allowed to overlap. ◆ The accrual period is calculated according to the start date and end date of a cash flow plus day count convention
  • 8. Amortizing Swap Practical Notes (Cont) ◆ The forward rate should be computed based on the reset period (index reset date, index start date, index end date) that are determined by index definition, such as index tenor and convention. it is simply compounded. ◆ Sometimes there is a floating spread added on the top of the floating rate in the floating leg. ◆ The formula above doesn’t contain the last live reset cash flow whose reset date is less than valuation date but payment date is greater than valuation date. The reset value is 𝑃𝑉𝑟𝑒𝑠𝑒𝑡 = 𝑟0 𝑁𝜏0 𝐷0 where 𝑟0 is the reset rate.
  • 9. Amortizing Swap Practical Notes (Cont) ◆ The present value of the reset cash flow should be added into the present value of the floating leg. ◆ Some dealers take bid-offer spreads into account. In this case, one should use the bid curve constructed from bid quotes for forwarding and the offer curve built from offer quotes for discounting.
  • 10. Amortizing Swap A Real World Example Fixed Leg Specification Floating Leg Specification Notional Schedule Currency USD Currency USD 6100520 9/1/2015 Day Count dcAct360 Day Count dcAct360 6075492 10/1/2015 Leg Type Fixed Leg Type Float 6050464 11/1/2015 Notional 6100520 Notional 6100520 6024284 12/1/2015 Pay Receive Receive Pay Receive Pay 5998104 1/1/2016 Payment Frequency 1M Payment Frequency 1M 5971924 2/1/2016 Start Date 9/1/2015 Start Date 9/1/2015 5945744 3/1/2016 End Date 4/3/2023 End Date 4/3/2023 5919564 4/1/2016 Fixed Rate 0.0245 Spread 0 5893384 5/1/2016 Index Specification 5867204 6/1/2016 Index Type LIBOR 5841024 7/1/2016 Index Tenor 1M 5814844 8/1/2016 Index DayCount dcAct360 5788664 9/1/2016