BRRRR HELOC Analysis

[JoDell Walker]

Would anyone feel so kind as to walk me through the BRRRR calculator using a HELOC? I haven't yet figured out how to incorporate that monthly payment until refinance. I feel like I just have to enter the purchase as "cash" but then I don't see what I'd being paying on the HELOC.

Sample analysis: 

$40 K Purchase Price

$20 K Rehab

All paid for with HELOC at 4.5%

Is there a place to put these numbers that I'm not seeing? Or do I just have to do the math on my own. 

Thanks in advance.