@Zach Howard the basics of the Rental Purchase Calculator is easy to understand and replicate.Google and you can find many similar spreadsheets for free.

It also will help you a lot to learn how to properly calculate ARV as your buyers will want to work with those wholesalers more than one who is just throwing properties at them.

As far as calculating cashflow, I would still suggest considering all the PITI and other overhead expenses.

The rest, put you on near-worthless drip campaigns, don't understand calculating the offer price based upon rents - property taxes - insurance - MNT & Vacancy percentages, etc.DM @James Wise to schedule a chat with him!

I've been running the numbers on different properties using a variety of online calculators for properties that I initially thought looked like there may be potential.

This is the form any lender should use to calculate you income (ignore the branding, it is the same for every lender):   https://www.biggerpockets.com/forums/49/topics/1224525-fha-l...You will see what you can add back from your 1120 based on the % of your ownership. 

Assume that i got margin with IBKR their calculation shows 5.4% and costs 21.8k per year for 400k.So assuming property is 700k with conventional loan and 670k with cash offer.I manage to find another 270k (this is what I'm asking) without paying any origination fees.

In this case, since they are borrowing their payments, these would get added to the principal balance each month, and interest would be calculated on that.If, for example, the interest rate on the note were 10%, they would implicitly be borrowing their payments at that rate.

I have come to the realization that my calculations are not as solid at I once thought.

Here's a bit more in detail about how rates are calculated for DSCR loans:1.