Calculating rental on live in home

[Ignacio Rosenberg]

Hi everyone;

I’ve been thinking of renting my current live in home in order to advance my real estate career. The emotional detachment part is no big deal, I think I always saw it as a stepping stone anyways. 

My question is: what numbers do I put in? As in, is the “purchase cost” what I currently owe or what I bought it for originally? what about closing costs?