What cashflow to use for IRR calculations?

I'm trying to find out the IRR in my DCF model, and I'm not sure what cashflow to use. On one hand, my instinct tells me to use the unlevered cashflow as that's what the DCF model uses, but I've been recommended to use EBITDA instead (without an explanation).

I'm wondering if any of you monkeys here can share some insights on this? thanks in advance!

7 Comments
 

Thank you for your comments, and that's what I thought initially too. However, when I calculate the IRR on IBM using FCFF, it's at only 1%. This doesn't seem very realistic...

Additionally in a DCF model, the generated enterprise value is essentially the NPV. However, a WACC of 1% comes no where close of making the NPV 0. I'm very new to this - I hope this isn't too rudimentary of a question

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