Hi
"Is there is a way to include depreciation & tax information using transaction classes to impact the NPV & IRR calculations?"
Yes - you can include the depreciation & tax information
I don't think that would impact the NPV adn IRR calculations.
I would suggest that you create a separate subpage where you define these 4 attributes, and create the calculated attributes to capture the mentioned.
Planned NPV = Planned Benefit - Planned Cost
Planned ROI = Planned NPV / Planned Cost
IRR - [Formula]
These can then be pulled onto a business report. We did so a while back.
Regards
NJ