But is it better to pay the tip in cash or add it to your credit card receipt? Lisa Mirza Grotts, an etiquette expert of 23 years, said, “When in doubt, cash it out. It’s direct and prompt.

No matter what businesses you patronize in the United States, it’s likely that you’ll be prompted to offer a tip. However, the rapidly changing tipping culture raises questions about its ...

Smartphones and tablets often come with software that enables merchants to accept your credit or debit card and allows you to select a fixed or custom tip. Many merchants who would never even ...