by Allen J. Sheinman | March 13, 2015

The following tips on tipping come from etiquette expert Jacqueline Whitmore, founder of the Protocol School of Palm Beach (Fla.) and author of Poised for Success: Mastering The Four Qualities That Distinguish Outstanding Professionals.
Taxi drivers: 10 to 15 percent of the bill
Car service: 20 percent of the bill. In some cases, the tip is included. If you’re not sure, ask.
Shuttle drivers: $1 per bag
Skycaps: $1 to $2 per bag
Doorman: $1 to $2 per bag for moving your bags from the car to the bell cart. Tip $1 to $2 dollars for hailing a taxi for you.
Bellman: $1 to $2 per bag and $1 to $2 for every delivery to your room
Concierge: $10 or more for special services such as securing you a hard-to-get reservation to a popular restaurant
Housekeeper: Tip $2 to $3 per night, add an additional $1 to $2 for special requests. If you have the same housekeeper throughout your stay, place the money in an envelope labeled "Housekeeping" at the end of your trip and leave it in a location where it can be easily seen, such as on a pillow. If there are multiple housekeepers, tip each day.
Room service: 15 to 18 percent of the bill before taxes. Tipping is optional if a service charge is included in the bill.
Valet: $2 to $5 each time an attendant retrieves your car
Spa service: 15 to 20 percent of the bill
Coatroom attendant: $1 to $2 per item
Maitre d': $10 to $100 depending on the restaurant, occasion and level of service you expect. Present the tip before you sit down at your table.
Wine sommelier: Gratuity is optional but recommended for extremely attentive or helpful sommeliers. A tip of 5 to 10 percent of the wine charge is appropriate.
Restroom attendant: 50 cents to $1 for handing you a towel or if you use any products displayed on the sink

Do you agree with these guidelines? If not, comment below or send thoughts to your faithful List compiler, Allen J. Sheinman, at [email protected].