Could you please tell me what is the treatment of depreciation in calculation of payback period? In your example in lecture notes there is no depreciation at all but now I have came across a question where depreciation was added to cash inflow value. Is it because in the question they specified that depreciation is charged on straight line basis? So do I ignore it if it’s not mentioned anywhere in the question?
The payback period is calculated on the cash flows, and depreciation is not a cash flow.
Without seeing the example you are referring to, I can only imagine that you are given the profits each year, in which case you would add back the depreciation to get the net cash flow each year.