CRLLS
Thinks s/he gets paid by the post
I generally tip minimum of 20% on the before-tax bill, then round up. Rounding up makes up for adding it to the credit card bill and the wait staff losing 2-4% of "their" tip. I also use the "full value" of the meal when I use a coupon or get a Senior discount. If the service is terrible, then seldom do less than 15%. I tip on the pretax amount because I don't feel that the wait staff should get a bump up just because they work in a higher taxed area, but they should get a fair tip for their efforts.