I get a phone audit on my GL in the spring. I would NOT open my books up to these people. Period. Not to hid anything, but its not his damn business to be into all that. This is generally based off total sales. If they want to see something, print out a copy of your financial statements in a simple format. That would be ALL they would get from me. There is NO WAY I would open my checkbook up for anyone. As a small business and a solo operator that you are, this is none of his business.