autograt

Etymology

Shortened auto- +‎ gratuity.

Noun

autograt (plural autograts)

1. (informal, rare, neologism) A gratuity automatically added to a bill.
   • 1998, "hilary gorman", Opinions on tipping situation (on Internet newsgroup phl.food)

     You should still get a good tip without the autograt if your customers are civilized people, and your work is good!

   • 2006, "Kevrob", ...and i won't eat at THAT place any more... (on Internet newsgroup rec.arts.sf.fandom)

     I'd also dislike the change to the "autograt", because mandatory service charges are usually subject to sales tax, while tips are not, so I'd actually wind up paying more, even if I would have tipped 20% anyway.