I usually tip 15% before tax. If the service was good then I tip more or use the after tax to calculate tip.
If there is minimal or no service, then I tip 10%. (those prob before and after tax total is similar.. e.g. a wonton noodle soup or a pho)
If it's bad, I will prob still tip 10% but try to put comment on the card or never go back.
You have to get me really really mad to not tip 10%.
For lofans, 15-20% before tax is normal.
it is no point to tip on taxes, I think 15% tip on food and service is reasonable,
but for wine? what do the servers do other than uncorking and pouring
your wine?
Isn't carry out fairly good service with equivalent food quality (based on their price range) a basic standard? I don't usually over tip them, unless they're doing surprisingly well to impress me. Depends on the "culture" of different cuisine, tip from 10% to 15% before tax is my normal practice.