Brian Dunning's FileMaker Custom Functions

fnCALC_TAUX ( ValeurActuelle ; NombreMensualites ; Mensualite ; 0,10 )

Returns the interest rate per period of an annuity. RATE is calculated by iteration

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  Sample input:
fnCALC_TAUX ( 150000; 240; 1000 ; 0.10)
  Sample output:
0,4267...

  Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

Same as RATE() function in Excel with only required parameters.

• Total number of payment periods in an annuity.
• The payment made each period.
• The present value.
• The fourth parameter (0.10 aka 10%) in the exemple above is just an initial rate.

 

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