I think you are forgetting the last argument.
Rate / Nper / Pv / Start_period / End_Period / Type
If you're using the wizard, there is a 5th argument that you must tab down to.
Type...
0 = Payment at the end of the period
1 = payment at the start of the period.

=CUMIPMT(0.09/12,30*12,125000,13,24,0)
returns -11,135.23

HTH,
--
Gary Brown

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"Computer Bob" wrote:

This function does not recognize a cell referrence (or a number directly
input) for the second input, number of periods. Instead it returns #N/A.