I essentially always tip 20% on the full bill (including tax), but for very special service, I adjust the tip up to as much as 25%. Recently, at several very upscale restaurants in Los Angeles, a surcharge of 3% has been showing up on checks. This is variously described a "health care surcharge" or "as a way of showing thanks to the kitchen staff who do not share in the tips left for the servers". This surcharge is not optional...it's a part of the bill. Question: If the tip I am inclined to leave is 20% (or 25%), if it reasonable to adjust this downward to 17% (or 22%) in that we've already given 3% allegedly to benefit the staff?