Oliver Mims, the British-born host of Proper Ollie, an Internet TV show focused
on manners, said 15 percent used to be the standard tip for regular service, say
at a hair salon, but that many people now routinely give 20 percent tips.
And if you still happen to forget someone? Don’t fret says Oliver Mims, host of online manners and etiquette show properollie.tv: "You can go back later” after the holidays, apologize for your
forgetfulness, and hand them the tip. They should have no problem
accepting it.