I'd imagine once you only conduct your business affairs in the PRIVATE they can never prove you actually use their money...
The term "under the table" (being paid for goods or services without a public record of it) would suggest that it's a "dodgy deal" one is engaging in when actually it's how it should preferably be done... Governments probably coined the phrase now that I think of it...:p
Printed copy · Anthology Volume 9, page 414Printed copy from The Tender For Law Anthology, Volume 9, page 414 (printed 13 June 2014). Added by this site; not part of the Facebook export.