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XLeratorDB/financial Documentation

SQL Server Rule-of-78 payoff function


R78PAYOFF
 
Updated: 31 October 2010

Use R78PAYOFF to calculate the payoff amount for a loan or lease using the Rule of 78.
Syntax
SELECT [westclintech].[wct].[R78PAYOFF] (
  <@IntAmt, float,>
 ,<@NumPmts, int,>
 ,<@PeriodNo, int,>
 ,<@Pmt, float,>)
Arguments
@IntAmt
the total interest over the life of the loan. You can use the TOTALINT function to obtain this value. @PV is an expression of type float or of a type that can be implicitly converted to float.
@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.
@PeriodNo
the period number for which you want calculate the payoff amount. Rule of 78 payoffs can only be calculated on regular payment dates. You can use the NPNO function to calculate the next payment date. @PeriodNo is an expression of type int or of a type that can be implicitly converted to int.
@Pmt
the payment amount. You can use the LPMT function to calculate @Pmt. @Pmt is an expression of type float or of a type that can be implicitly converted to float.
Return Type
float
Remarks
·         @IntAmt must be greater than zero
·         @NumPmts must be greater than 1
·         @PeriodNo must be greater than 1 and less than @NumPmts
·         @Pmt must be greater than zero
·         The Rule of 78 calculation is based on the number of payments, not the number of interest period. Thus odd long first periods do not affect the number of payments, though the first payment may include interest for multiple periods.
Example
Calculate the payoff amount, using the Rule of 78, for a 24,000 loan that originated on 8/15/2009 at a rate of 5.9%, with payments on the first of every month for 36 months, commencing on 9/1/2009, paid off on 12/1/2010. The monthly payment is 727.37
SELECT wct.R78PAYOFF(
       wct.TOTALINT(
             36
            ,727.37
            ,24000
            ,0
            )           --Total Interest
      ,36               --Number of Payments
      ,16               --Payoff Period Number
      ,727.37           --Monthly Payment
      ) as R78PAYOFF
This produces the following result.
R78PAYOFF
----------------------
14516.7986486486
 
(1 row(s) affected)
If you do not know the payment amount, you can use the LPMT function to calculate the amount.
SELECT wct.R78PAYOFF(
       m.TOTALINT --total interest on the loan
      ,36         --number of loan payment
      ,16         --payoff payment number
      ,m.PMT      --payment amount
      )
FROM (
         SELECT wct.TOTALINT(
          36      --Number of periods
         ,n.pmt   --Payment Amount
         ,24000   --Loan Amount
         ,0       --Future Value
         ) as TOTALINT
         ,PMT
         FROM (
         select ROUND(wct.LPMT(
          24000         --Loan Amount
         ,'8/15/2009'   --Loan Start Date
         ,.059          --Annual Interest Rate
         ,'9/1/2009'    --First Payment Date
         ,36            --Number of payments (5*12)
         ,12            --Number of payments per year
         ,NULL          --Days in year (defaults to 360)
         ,NULL          --FV (defaults to 0)
         ,NULL          --IntRule (defaults to 'A' meaning actuarial)
         ), 2) as pmt
         ) n
      ) m
This produces the following result.
R78PAYOFF
----------------------
14516.7986486486
 

(1 row(s) affected)



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