Just IRR will do.
You should realize that you get a monthly rate for monthly cash flows.

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Kind regards,

Niek Otten

"MB Burgis" <MB wrote in message ...
| What is the best formula to use when calculating an IRR for monthly cash flows?
|
| XIRR? or ((1+IRR(range,-0.01))^12)-1 ? or can just IRR be used?
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| Thank you