I believe the healthcare tax in SF is about 4% - 6%, but whatever it is, I just deduct from the tip. Also, when I realized how much per hour wait staff actually make in SF, I reduced my usual 20% tip to 15%. So, take off the healthcare tax, and my normal SF tip is now about 10% before tax & surcharges.

They don't like it, I suspect. But, it's between them, the restaurant and those who levy these taxes.