Estimating Noi using monthly cash flow and monthly expenses

[Dieudonne T.]

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I suppose total monthly cash flow and total monthly expenses could be used to estimate gross revenue and gross operating expenses to calculate NOI not counting the Xfactor( you know murphy's Law) Which if one knows the condition of each component( how old is the roof how old are the windows etc…) of their house one could make a certain educated guess based on the probability of the wear and tear of each component(roof window etc) to then come up with a ball park estimate of, if the components likely to break do break how much will it cost. This will be guess work and a lot of assumptions which could be a waste of time as one could simply wait till the end of the year to calculate NOI.