IPmt function in Access 2003

D

Dave Clissold

I am trying to calculate the monthly payments for a repayment mortgage using
the Pmt function

Pmt(sum([InterestRate]/1200),sum([MortgageTerm]*12),[MortgageAmount],0,0)

The result is always incorrect by about £200, I am checking my calculations
against online mortgage calculators and my own math. Can somebody tell me
where I am going wrong or suggest another way of calculating this.
 
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