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Equal vs Exact Coupons

Bonds that have equal coupons have a constant payment schedule throughout the life of the bond, while bonds with exact coupons have a variable payment schedule which depends on the number of days within each coupon period. Bonds with exact coupons have their coupon amounts calculated as:

 

 

CPi = the payment for the i'th coupon period.

DIPi = the number of days between the accrual start date and accrual end date for the i'th coupon, based on the selected accrual days basis.

DIYi = the number of assumed days in a year, based on the selected accrual days basis.

c = the annual coupon payment for the bond (computed as coupon rate multiplied by face value)

 

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