Make is a pure mathematical equation and take any emotions out of it.

Are there any spreadsheets or mathematical rules to look at for this kind of purchase and how would you all go about this process?

In most situations, the best mathematical equation is that you have higher income now than you will have once you reach FI.

In every world this is a mathematically inferior situation to paying less for the property, unless you are willing to gamble that the 10-40k is a drop in the bucket because the place is going to explode upwards in value...?

But that can slow you down if you have to save up more for the next deal...Mathematically, leaving money in a BRRRR deal is equivalent it investing it at the same rate as the mortgage.Really, you've got to find out what you want your portfolio to look like.

But honestly just checking to make sure I’m mathematically analyzing in the right direction.  

Your mileage may vary.I would imagine that you will get some calls, but there's no real mathematical formula to answer your question.

The mathematical conclusion was if you took any 25yr period in the window of study, it was always more cost affective overall for the mortgagor to go with a variable rate mortgage versus a fixed rate.

My risk hasn't changed at all but my reward may be mathematically notably more likely to be less.The key to all this is that since Class A is higher in the return stack than Class B, in general that means that the total pool of available proceeds to be distributed is already depleted by a potentially significant amount before Class B even starts to get their cut.

1. mathematically technically yes, in terms of efficiency and peace of mind no2.