To ask the question this way is to answer. Mothers are never wrong. @:-)

But, I notice that, as I travel around our Great Nation, this comes up all the time. For example, at a certain widely spread coffee chain, in some states, if you order to go, you pay no sales tax, if you ask for a china cup, you pay sales tax. In other states (Illinois) no matter what you say, you will get charged sales tax.

And, there are exceptions to the "rules". If you order to go in California, no sales tax. But, if you order to go at the LAX store, you are charged tax.