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# numpy.ipmt

`numpy.``ipmt`(rate, per, nper, pv, fv=0.0, when='end')

  Not implemented. Compute the payment portion for loan interest.

  Parameters : | rate : scalar or array_like of shape(M, ) Rate of interest as decimal (not per cent) per period per : scalar or array_like of shape(M, ) Interest paid against the loan changes during the life or the loan. The per is the payment period to calculate the interest amount. nper : scalar or array_like of shape(M, ) Number of compounding periods pv : scalar or array_like of shape(M, ) Present value fv : scalar or array_like of shape(M, ), optional Future value when : {{‘begin’, 1}, {‘end’, 0}}, {string, int}, optional When payments are due (‘begin’ (1) or ‘end’ (0)). Defaults to {‘end’, 0}.
  Returns : | out : ndarray Interest portion of payment. If all input is scalar, returns a scalar float. If any input is array_like, returns interest payment for each input element. If multiple inputs are array_like, they all must have the same shape.

  See also

  `ppmt`, `pmt`, `pv`

  Notes

  The total payment is made up of payment against principal plus interest.

  `pmt = ppmt + ipmt`

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