I built myself a little calculator. 

So thepointsguy calculator would suggest that you still use the credit card at 2.5%.  

What are ways you have seen landlords calculate rent raises?

Are most of you including things like property insurance, etc in your CoC calculations?

I've been playing with amortization calculators and have seen you can pay off 1/3 of the mortgage and reduce 2/3 of the duration.

There are just numerous variables and calculations you must analyze to check. 

Make sure to calculate the difference between the blended rate and an entirely new first lien position.

To calculate the cash-on-cash (CoC) return for the rehabbed unit, take the annual rental income from the newly rentable unit and divide it by the capital invested in the renovation.Formula:CoC Return = (Annual Rental Income) / (Rehab Cost)This will show you the return based solely on the funds you put into the rehab.

Helping Thomas calculate what he can close is the question.

How do I get the calculator to calculate interest for both the purchase price and the rehab.