I have done some rough math and as I pay him back I will still be profiting.

But if my math is right, post-tax cashflow is only $33/unit, and I'd want at least $100 ($50 for the efficiency).

Thanks for the input, so....For the sake of easy math, motivated seller house ARV is 100k.

That means if you are flipping, make sure that you use a lender that can also refi the property in a pinch...you have to check on the rental refinance loan terms to make sure your DSCR is manageable for the lender; do the math as if you have already taken out the HML and LOC.

He hates them forever and with an extraordinary malice.Never trust anyone's complicated math telling you how you're going to make money with their system.

It'll be someone that can/does count rental income aggressively to make the math work.

My math brain couldn't get passed paying down a super low fixed rate first when I had 6%+ and commercial investment loans.Your way will be slow as I'm sure you know. 

Second question is Analyzing the deal I’m not the best with my math and I don’t wnat to seem Unprofessional when Presenting the deal to the lenders.

Because it's a primary residence, math doesnt apply I guess. 

I would still cash flow with the new mortgage rate but if my math is correct I’d only be able to pull out about 9k..