He then wanted to talk about his odds of being audited and what numbers he needed to report to fly under the radar.I interrupted him part way through a rant against taxation, government, etc and said "I don't think I'm the right CPA for you."  

A Property Manager with hundreds of applicants every year will have to be more open about their processes to avoid a Fair Housing accusation or to survive an audit.

I'm going to set up a system of recurring reminders on something like a semiannual basis to audit all of my negotiable expenses.

Remember, these applicants can file complaints and so audits will happen.

@Aaron Grant from what I have heard, to much paperwork, and fear that it will trigger an audit, which I guess used to be kinda true many years ago but from what I have heard, not anymore.

Now, after you've refused to rent to someone, and they wind up homeless, they land on the city's doorstep, and the city listens to their sob story, decides you are wrong, and suddenly you have tax audits, building inspectors, and enough alphabet soup to DROWN you in your life. 

Utility customers can then request an energy audit and receive a report on ways to increase energy efficiency.

And they could audit her to see if she spent it or just stuffed it in her mattress :-)

They have to deal with a lot of inspections and audits, etc., but there is always a waiting list and the tenants are pretty mellow for the most part.

To set-up for payment processing on your own and pass PCI and/or ACH requirements can be expensive (development, audit and assurance) and, as @Jimmy Moncrief warned, the liability is almost certain to outweigh the benefit of brand control.For a small operation, I would recommend you find a storefront hosting provider or payment gateway and simply throw the session to it from your website.