Modified Internal Rate of Return

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Investment and funding appraisal - internal rate of return (IRR) - re-invested funds.

(MIRR).

Modified Internal Rate of Return is a refinement of the internal rate of return (IRR).


Modified Internal Rate of Return assumes a pre-determined reinvestment rate for any surplus cash flows during the life of the proposal being appraised.

This is different from the assumption in the usual IRR calculation, which assumes re-investment at the IRR itself.


MIRR is sometimes known as the external rate of return.


See also