Two protocol questions for the Chowhounds out there...
First, do you tip on the after-tax amount or the before-tax amount?
Second, when dining out using a discount deal from Blackboard Eats or alike (e.g. 30% off your meal) do you tip based on the non-discounted price or based on the discounted price?
I appreciate that waitstaff needs and deserves to be paid. I respect that and am generally a 20% tipper given decent food and service however; I also think in the case of tax that it isn't a "service" so why should I pay extra for it and in the case of discounted deals that the restaurant has already decided to discount its service likely because they believe doing so will increase traffic, and in this case they're right because that's why I'm eating there... so presumably it's a win on all sides- for the diner, the staff and the restaurant- so shouldn't all sides receive the same level of benefit?