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From: Dev on 3 Jun 2010 19:54
To do the calculation first you need to calculate yield to maturity. Then you create the the Bond Calendar by using Days360 function in Excel. Please note that corporate bond interest is calculated on a 360 day year basis. There are two flavors, one is US NASDAQ, and the other is European. Using this function you compute the number of days from the purchase date to each month end. Then you can subtract the previous months number of days since purchase from this month's number. That gives you the number of days inthe month. Then you calculate the Effective Interest earned on the (Bond Par Value+Premium or -discount). Then you subtract this interest from the coupon interest on the Par Value of the Bond. If the Bond was purchased at a premium, the effective interest will be lower than the coupon. This difference is then applied to the Bond Premium to write-off the premium against Coupon Interest. You have to reduce premium every month vbefroe you calculate the next month's effective interest. Coupon interest stays constant. So if all your calculations are right, the bond premium should be reduced to 0 by the maturity date. Good luck. It sounds more complicated than it is.



lmahaffey wrote:

Bond premium amortization using the constant yield method
26-Jan-10

Anyone know of a function that calculates the bond premium amortization using
the constant yield method?

An example of a bond premium that would need amortizing would be:

Par: 100,000
Price: 101
Bought: July 15, 2009
Maturity: June 30, 2019
Cash Paid: 101,000
Premium: 1,000
Coupon: 5% paid semi-annually, 6/30 and 12/31

Thank you

Previous Posts In This Thread:

On Tuesday, January 26, 2010 2:38 PM
lmahaffey wrote:

Bond premium amortization using the constant yield method
Anyone know of a function that calculates the bond premium amortization using
the constant yield method?

An example of a bond premium that would need amortizing would be:

Par: 100,000
Price: 101
Bought: July 15, 2009
Maturity: June 30, 2019
Cash Paid: 101,000
Premium: 1,000
Coupon: 5% paid semi-annually, 6/30 and 12/31

Thank you


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