 # SQL Server next payment number function

NPNO

Updated: 06 December 2010

Use NPNO to calculate the next payment number for loan with regularly scheduled periodic payments.
Syntax
SELECT [wctFinancial].[wct].[NPNO] (
<@SettDate, datetime,>
,<@FirstPayDate, datetime,>
,<@Pmtpyr, int,>
,<@NumPmts, int,>)
Arguments
@SettDate
the date from which you want to calculate the next payment number. The next payment number is always associated with the minimum payment date greater than @SettDate. @SettDate is an expression of type datetime or of a type that can be implicitly converted to datetime.
@FirstPayDate
the date that the first payment is due. @FirstPayDate is an expression of type datetime or of a type that can be implicitly converted to datetime.
@Pmtpyr
the number of loan payments made in a year. @NumPmts is an expression of type int or of a type that can be implicitly converted to int.
@NumPmts
the total number of payments to be recorded over the life of the loan. @NumPmts is an expression of type int or of a type that can be implicitly converted to int.
Return Type
float
Remarks
·         @Pmtpyr must be between 1 and 365
·         If @Pmtpyr = 13, then payments are calculated every 28 days from @FirstPayDate.
·         If @Pmtpyr = 26, then payments are calculated every 14 days from @FirstPayDate.
·         If @Pmtpyr = 52, then payments are calculated every 7 days from @FirstPayDate.
·         If @Pmtpyr = 1, then payments are calculated every 1 year from @FirstPayDate.
·         If @Pmtpyr = 2, then payments are calculated every 6 months from @FirstPayDate.
·         If @Pmtpyr = 3, then payments are calculated every 4 months from @FirstPayDate.
·         If @Pmtpyr = 4, then payments are calculated every 3 months from @FirstPayDate.
·         If @Pmtpyr = 6, then payments are calculated every 2 months from @FirstPayDate.
·         If @Pmtpyr = 12, then payments are calculated every 1 month from @FirstPayDate.
·         If @Pmtpyr = 24, then payments are calculated every semi-monthly from @FirstPayDate. If the @FirstPayDate is the 15th of the month, payments are on the 15th and the last day of the month. If the @FirstPayDate is the last day of the month, then payment dates are on the last day of the month and the 15th day of the month.
·         If @NumPmts IS NOT NULL, then NPD will not return a number greater than the @NumPmts.
·         If @SettDate < @FirstPayDate then 1 is returned
Example
Calculate the next payment number on 11/1/2010 for a loan that commenced on 8/31/2008, paying interest monthly on the 15th of the month, starting 9/15/2008.
SELECT wct.NPNO(
'11/01/2010'     --@SettDate
,'09/15/2010'     --@FirstPayDate
,12               --@Pmtpyr
,NULL             --@NumPmts
) as NPNO
This produces the following result.
NPNO
----------------------
3

(1 row(s) affected)

Calculate the next payment number on 10/29/2010 for a loan that commenced on 7/15/2009, paying interest every two weeks starting on 7/29/2009.
SELECT wct.NPNO(
'10/29/2010'     --@SettDate
,'7/29/2009'      --@FirstPayDate
,26               --@Pmtpyr
,NULL             --@NumPmts
) as NPNO
This produces the following result.
NPNO
----------------------
34

(1 row(s) affected)

Calculate the next payment number on 10/29/2010 for a loan that commenced on 2/28/2009, paying interest every semi-monthly starting on 3/15/2009.
SELECT wct.NPNO(
'10/29/2010'      --@SettDate
,'3/15/2009'      --@FirstPayDate
,24               --@Pmtpyr
,NULL             --@NumPmts
) as NPNO
This produces the following result.
NPNO
----------------------
41

(1 row(s) affected)

Calculate the next payment number on 12/6/2010 for a loan that commenced on 12/06/2010, paying interest monthly on the 15th of the month, starting 12/15/2010.
SELECT wct.NPNO(
'12/06/2010'     --@SettDate
,'12/15/2010'     --@FirstPayDate
,12               --@Pmtpyr
,NULL             --@NumPmts
) as NPNO
This produces the following result.
NPNO
----------------------
1

(1 row(s) affected)

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