I'd then focus on building out a "business solution" arm to bring in clients with recurring monthly revenue.

I found the best solution is to create an import template in Excel with pre-populated descriptions for the recurring transactions (rents, garbage, landscaping, pest control, etc.) and import it into Xero and then manually key the non-recurring transactions (primarily repairs).  

So, don't shortcut the need to treat this transaction exactly the way you treat it in your brokerage business; state-approved CBS, dates/deadlines, prelim title, inspections, survey, insurance, appraisal, title, RMLO process/credit counseling (takes place of loan approval), then on to title co escrow close.Finally, as @Guy Gimenez also mentioned, you absolutely should use a note servicing agent (think "arms-length"), which very nearly always is covered by the buyer (both one-time and recurring costs). 

However, there may be additional recurring costs such as landlord paid utilities, snow removal and lawn care as well as non-recurring but expected costs that should properly be reserved (repairs, vacancies, capital improvements). 

I think I would have a similar experience if I got myself to a conference and this seems to be a recurring suggestion.I would be very interested to know more about the early failures if you are willing to share.

Higher priced QMs are entitled to a rebuttable presumption of compliance, rather than a safe harbor.A consumer may rebut the compliance presumption on higher-priced loans by showing that the consumer’s income and obligations would leave them with insufficient residual income or assets to meet living expenses including “any recurring and material non-debt obligations of which the creditor was aware at the time of consummation.”

Just recurring debt IE; cell phone, helping mom with monthly bills, etc...I have a car which is paid, and wouldn't want to loan against but maybe if I felt exceedingly confident.

After looking at so many properties that have been hit by copper thieves over the years, I have started to have this recurring fantasy about catching them in the act. 

So what are the most common rehab budget items you miss on and why does it recur?

Only complete income number is for rent, but if I have a one time payment or something that is not recurring how do i add that in, or are you saying that is something i should not add into the equation.