What is the 'Notional Principal Amount'
The notional principal amount, in an interest rate swap, is the predetermined dollar amounts on which the exchanged interest payments are based. The notional principal never changes hands in the transaction, which is why it is considered notional, or theoretical. Neither party pays nor receives the notional principal amount at any time; only interest rate payments change hands.
BREAKING DOWN 'Notional Principal Amount'
For example, two companies might enter into an interest rate swap contract as follows: For three years, Company A pays Company B 5% interest per year on a notional principal amount of $10 million. For the same three years, Company B pays Company A the oneyear LIBOR rate on the same notional principal amount of $10 million. This would be considered a plain vanilla interest rate swap because one party pays interest at a fixed rate on the notional principal amount and the other party pays interest at a floating rate on the same notional principal amount.Notional principal refers to the assumed amount of principal involved in a financial transaction, even though it is functionally separated from the transaction. This can include the underlying principal in a debt security in interest rate swaps, as the rates are actual components in the transaction, but the principal is functionally fictitious.
Interest Rate Swaps
An interest rate swap involves two organizations lending funds to each other but with different terms. The repayment schedule may be for different durations or for different interest rates. In cases where the transactions involve the same amount of principal (the amount being lent and received by each party), the principal is notional in nature and does not actually change hands, or may not even functionally exist.
Often, interest rate swaps are used to help shift the risk or return of particular investments up on down, where one organization will have an asset with a variable rate while the other holds an asset with a fixed rate. Accepted as a zerosum agreement, one party may benefit from the arrangement while the other experiences a loss.
Notional Principal Amount and Bond Issues
When calculating bond payments, the face value of the bond is considered to be notional in regards to determining the interest due. The payments are a percentage of the face value, even if the face value is not available in a true sense. The face value cannot be withdrawn and may not even exist in a traditional sense until the bond approaches maturity, but it does have an understood value that is required for the performing of relevant calculations.

Amortizing Swap
An exchange of cash flows, one of which pays a fixed rate of ... 
Fixed Price
The leg of a swap that is based on an unchanging interest rate. ... 
Notional Value
The total value of a leveraged position's assets. This term is ... 
Floating Price
The leg of a swap that is based on a fluctuating interest rate. ... 
Accreting Principal Swap
A derivative where counterparties exchange financial instrument ... 
Index Amortizing Swap  IAS
An interest rate swap where the notional principal amount declines ...

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