10 Tips From Bartenders on How Much You Should Tip

2. Calculate the tip from the final total

This is probably something that has not occurred to many of us, but some people always calculate the tip based on the sub-total and not the after-tax total. Bartenders expect and believe it is fair to expect to be tipped based on the amount you actually have to pay. They make a good point. While it makes sense to be frugal much of time time, calculating a tip from the sub-total may be overdoing it a bit.