DIRTYYIELD
Updated: 10 November 2014
Use the scalar function DIRTYYIELD to calculate the yield of a bond from the dirty price. The dirty price of a bond is the discounted cash flow value of all the remaining coupons plus the discounted cash flow value of the redemption amount. This is equivalent to the clean price of the bond plus the accrued interest.
You can use DIRTYYIELD for bonds that pay regular period interest, bonds with an odd first coupon period, bonds with an odd last coupon period, and bonds with both and odd first and an odd last coupon period.
Syntax
SELECT [wct].[DIRTYYIELD](
<@Settlement, datetime,>
,<@Maturity, datetime,>
,<@Rate, float,>
,<@Price, float,>
,<@Redemption, float,>
,<@Frequency, float,>
,<@Basis, nvarchar(4000),>
,<@Issue, datetime,>
,<@FirstCoupon, datetime,>
,<@LastCoupon, datetime,>)
Arguments
@Settlement
the settlement date of the bond. @Settlement is an expression that returns a datetime or smalldatetime value, or a character string in date format.
@Maturity
the maturity date of the bond. @Maturity is an expression that returns a datetime or smalldatetime value, or a character string in date format.
@Rate
the bondâ€™s annual coupon rate. @Rate is an expression of type float or of a type that can be implicitly converted to float.
@Price
the bondâ€™s dirty price. @Price is an expression of type float or of a type that can be implicitly converted to float.
@Redemption
the bondâ€™s redemption value per 100 face value. @Redemption is an expression of type float or of a type that can be implicitly converted to float.
@Frequency
the number of coupon payments per year. For annual payments, @Frequency = 1; for semiannual, @Frequency = 2; for quarterly, @Frequency = 4; for bimonthly, @Frequency = 6; for monthly, @Frequency = 12. For bonds with @Basis = 'A/364' or 9, you can enter 364 for payments made every 52 weeks, 182 for payments made every 26 weeks, 91 for payments made every 13 weeks, 28 for payments made every 4 weeks, 14 for payments made every 2 weeks, and 7 for weekly payments. @Frequency is an expression of type float or of a type that can be implicitly converted to float.
@Basis
is the type of day count to use. @Basis is an expression of the character string data type category.
@Basis

Day count basis

0, 'BOND'

US (NASD) 30/360

1, 'ACTUAL'

Actual/Actual

2, 'A360'

Actual/360

3, 'A365'

Actual/365

4, '30E/360 (ISDA)', '30E/360', 'ISDA', '30E/360 ISDA', 'EBOND'

European 30/360

5, '30/360', '30/360 ISDA', 'GERMAN'

30/360 ISDA

6, 'NL/ACT'

No Leap Year/ACT

7, 'NL/365'

No Leap Year /365

8, 'NL/360'

No Leap Year /360

9, 'A/364'

Actual/364

10, 'BOND NONEOM'

US (NASD) 30/360 nonendofmonth

11, 'ACTUAL NONEOM'

Actual/Actual nonendofmonth

12, 'A360 NONEOM'

Actual/360 nonendofmonth

13, 'A365 NONEOM'

Actual/365 nonendofmonth

14, '30E/360 NONEOM', '30E/360 ICMA NONEOM', 'EBOND NONEOM'

European 30/360 nonendofmonth

15, '30/360 NONEOM', '30/360 ISDA NONEOM', 'GERMAN NONEOM'

30/360 ISDA nonendofmonth

16, 'NL/ACT NONEOM'

No Leap Year/ACT nonendofmonth

17, 'NL/365 NONEOM'

No Leap Year/365 nonendofmonth

18, 'NL/360 NONEOM'

No Leap Year/360 nonendofmonth

19, 'A/364 NONEOM'

Actual/364 nonendofmonth

@Issue
the issue date of the bond; the date from which the bond starts accruing interest. @Issue is an expression that returns a datetime or smalldatetime value, or a character string in date format.
@FirstCoupon
the first coupon date of the bond. The period from the issue date until the first coupon date defines the odd interest period. All subsequent coupon dates are assumed to occur at regular periodic intervals as defined by @Frequency. @FirstCoupon is an expression that returns a datetime or smalldatetime value, or a character string in date format.
@LastCoupon
the last coupon date of the bond prior to the maturity. The period from the last interest date until the maturity date defines the odd interest period. All coupon dates from @FirstCoupon to @LastCoupon are assumed to occur at regular periodic intervals as defined by @Frequency. @LastCoupon is an expression that returns a datetime or smalldatetime value, or a character string in date format.
Return Type
float
Remarks
Â· If @Settlement is NULL then @Settlement = GETDATE().
Â· If @Rate is NULL then @Rate = 0.
Â· If @Price is NULL then @Price = 0
Â· If @Redemption is NULL then @Redemption = 100.
Â· If @Frequency is NULL then @Frequency = 2.
Â· If @Basis is NULL then @Basis = 1.
Â· If @Maturity <= @Settlement then no rows are returned.
Â· If @Frequency invalid DIRTYYIELD returns an error.
Â· If @Basis invalid (see above list), DIRTYYIELD returns an error.
Â· If @Maturity is NULL then @Maturity = GETDATE().
Â· To calculate the dirty yield for a bond paying regular periodic interest just enter @Maturity and @Settlement.
Â· To calculate the dirty yield for bond with an odd first coupon where the settlement date is before the first coupon date, enter @Issue, @FirstCoupon, @Settlement, and @Maturity. If the settlement date is on or after the first coupon date just enter @Maturity and @Settlement.
Â· To calculate the dirty yield for a bond with an odd last coupon enter @LastCoupon, @Settlement, and @Maturity.
Â· To calculate the dirty yield for bond with an odd first coupon and an odd last coupon where the settlement date is before the first coupon date, enter @Issue, @FirstCoupon, @LastCoupon, @Settlement, and @Maturity. If the settlement date is on or after the first coupon date just enter @LastCoupon, @Maturity and @Settlement.
Examples
In this example we calculate the yield for bond which pays regular period interest and is maturing on 20340615. The settlement date is 20140501, the dirty price is 96.945314, the coupon rate is 2.50%, the redemption value is 100, the coupon is paid twiceyearly and the daycount convention is actual/actual.
SELECT
wct.DIRTYYIELD(
'20140501' @Settlement
,'20340615' @Maturity
,0.025 @Rate
,96.945314 @Price
,100 @Redemption
,2 @Frequency
,1 @Basis
,NULL @Issue
,NULL @FirstCoupon
,NULL @LastCoupon
) as YIELD
This produces the following result.
YIELD

0.0275999999810977
Using the same bond information, we compare the yield calculation for dirty price and clean price.
SELECT
wct.DIRTYYIELD(
'20140501' @Settlement
,'20340615' @Maturity
,0.025 @Rate
,96.945314 @Price
,100 @Redemption
,2 @Frequency
,1 @Basis
,NULL @Issue
,NULL @FirstCoupon
,NULL @LastCoupon
) as [DIRTY YIELD]
,wct.YIELD(
'20140501' @Settlement
,'20340615' @Maturity
,0.025 @Rate
,96.945314 
wct.BONDINT(
'20140501' @Settlement
,'20340615' @Maturity
,0.025 @Rate
,100 @Par
,2 @Frequency
,1
) @Yield
,100 @Redemption
,2 @Frequency
,1) as YIELD
This produces the following result.
DIRTY YIELD YIELD
 
0.0275999999810977 0.0275999999810943
Here's an example of a bond with an odd short first coupon settling on the issue date of the bond.
SELECT
wct.DIRTYYIELD(
'20140501' @Settlement
,'20340615' @Maturity
,0.0250 @Rate
,96.007563 @Price
,100 @Redemption
,2 @Frequency
,1 @Basis
,'20140501' @Issue
,'20140615' @FirstCoupon
,NULL @LastCoupon
) as YIELD
This produces the following result.
YIELD

0.0276000000719114
This is a bond with an odd long first coupon, also settling on the issue date.
SELECT
wct.DIRTYYIELD(
'20140501' @Settlement
,'20340615' @Maturity
,0.0250 @Rate
,96.003370 @Price
,100 @Redemption
,2 @Frequency
,1 @Basis
,'20140501' @Issue
,'20141215' @FirstCoupon
,NULL @LastCoupon
) as YIELD
This produces the following result.
YIELD

0.0276000001919593
This is a bond with an odd short last coupon settling in the last coupon period.
SELECT
wct.DIRTYYIELD(
'20141001' @Settlement
,'20141215' @Maturity
,0.0225 @Rate
,100.544777 @Price
,100 @Redemption
,2 @Frequency
,1 @Basis
,NULL @Issue
,NULL @FirstCoupon
,'20140915' @LastCoupon
) as YIELD
This produces the following result.
YIELD

0.000999982458893136
This is a bond with an odd long last coupon settling in the final period.
SELECT
wct.DIRTYYIELD(
'20141001' @Settlement
,'20141215' @Maturity
,0.0225 @Rate
,101.669544 @Yield
,100 @Redemption
,2 @Frequency
,1 @Basis
,NULL @Issue
,NULL @FirstCoupon
,'20140315' @LastCoupon
) as YIELD
This produces the following result.
YIELD

0.000999981141517186
This is a bond with an odd short last coupon settling before the last coupon date.
SELECT
wct.DIRTYYIELD(
'20141001' @Settlement
,'20341215' @Maturity
,0.0425 @Rate
,103.631083 @Price
,100 @Redemption
,2 @Frequency
,1 @Basis
,NULL @Issue
,NULL @FirstCoupon
,'20340915' @LastCoupon
) as YIELD
This produces the following result.
YIELD

0.0400000001583029
This is a bond with an odd long last coupon settling before the last coupon date.
SELECT
wct.DIRTYYIELD(
'20141001' @Settlement
,'20341215' @Maturity
,0.0425 @Rate
,103.621532 @Price
,100 @Redemption
,2 @Frequency
,1 @Basis
,NULL @Issue
,NULL @FirstCoupon
,'20340315' @LastCoupon
) as YIELD
This produces the following result.
YIELD

0.0400000003307667
This is a bond with an odd long first coupon and an odd long last coupon.
SELECT
wct.DIRTYYIELD(
'20130304' @Settlement
,'20221128' @Maturity
,0.03125 @Rate
,104.420160 @Price
,100 @Redemption
,2 @Frequency
,1 @Basis
,'20120607' @Issue
,'20130315' @FirstCoupon
,'20220315' @LastCoupon
) as YIELD
This produces the following result.
YIELD

0.0287499995826744
This is a bond with an odd long first coupon and an odd short last coupon.
SELECT
wct.DIRTYYIELD(
'20130304' @Settlement
,'20220428' @Maturity
,0.03125 @Rate
,104.315731 @Yield
,100 @Redemption
,2 @Frequency
,1 @Basis
,'20120607' @Issue
,'20130315' @FirstCoupon
,'20220315' @LastCoupon
) as YIELD
This produces the following result.
YIELD

0.0287499999681818
This is a bond with an odd short first coupon and an odd long last coupon.
SELECT
wct.DIRTYYIELD(
'20130304' @Settlement
,'20221128' @Maturity
,0.03125 @Rate
,102.855827 @Price
,100 @Redemption
,2 @Frequency
,1 @Basis
,'20121207' @Issue
,'20130315' @FirstCoupon
,'20220315' @LastCoupon
) as YIELD
This produces the following result.
YIELD

0.0287499997947794
See Also