To tip or not to tip, and if yes, when and how much for what services? We asked a panel of travel experts for guidance. Keep in mind that these “tips” are only for domestic travel; tipping customs vary overseas, and there are no hard rules as to amounts. As Wendy Perrin, editor of wendyperrin.com, says, “I’m not a fan of giving somebody a tip just because they came to work. Shouldn’t tipping be to reward good service? And shouldn’t the amount of a tip vary depending on the quality of service received?”

Our expert panel: Perrin; Ed Perkins, contributor, SmarterTravel.com; William D. Frye, associate professor, College of Hospitality and Tourism Management, Niagara University; and Sarah Schlichter, senior editor of IndependentTraveler.com

AT THE AIRPORT

RENTAL-CAR SHUTTLE BUS DRIVER

Perrin It depends on what they do for you. “If they help with a heavy bag, maybe $1 or $2.”

Perkins $1

Frye $2 per person but only “if they assist with luggage.”

SKYCAP

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Perrin $2 per bag

Perkins $2 for one bag, $3 for two

Frye “If they check luggage, $3 to $5 for the first bag and $2 for each additional bag, depending on how heavy. For red caps who assist at baggage claim, tip $5 for the first bag and $3 to $5 for each additional bag.”

WHEELCHAIR ATTENDANT

Perrin It depends. “How long did they accompany you, did they work on a holiday?”

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Perkins $2 to $5 depending on time and distance

Frye $5 to $20 “depending how long they spend assisting. Courtesy and promptness should also factor in.”

AT THE HOTEL

MAID

There was a wide range for this essential employee.

Perrin It “depends how big a mess my kids have made. Perhaps $5 to $10 a day.”

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Perkins Flat $2 per day

Frye $2 to $5 per night, but “double if the room is a suite.”

Schlichter $2 to $5 per night, “depending on how messy your room is.”

EMPLOYEE WHO BRINGS ICE, IRON, ETC.

Perrin No tip is necessary “unless he or she had to go to great lengths to procure the item.”

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Perkins Flat $2

CONCIERGE

Perrin “It depends how much of his time you took up, whether he got you the reservation because you couldn’t, whether the restaurant was sold out, etc.”

Frye “$10 for simple tasks, and it goes up from there, depending on the service.”

Schlichter “$5 to $25 for a concierge who has provided personal service.”

BELLHOP

Perrin It depends on how far your room is from the front desk, how fast the bags are delivered and how many bags you have.

Perkins $1 to $2 per bag

Schlichter $1 to $2 per bag

DOORMAN WHO HELPS YOU INTO A CAB

Perrin If that’s his job, nothing, but $2 or $3 “if it’s raining and cabs are hard to find.”

Frye “If they unload or store your luggage, tip $5 for the first bag and $3 to $5 for each additional bag, and $2 to $3 more if cabs are hard to find.”

Schlichter $1 to $3

ON THE GROUND

TAXI OR UBER DRIVER

Schlichter “Part of the appeal of Uber is that you don’t need to tip, but you can if you like (in cash), and there’s some evidence that you could get a higher rating from your driver if you do.”

Most of our experts suggest the standard 15 percent to 20 percent.

TOUR GUIDE

Perrin “It totally depends on the circumstances. Is it a large-group tour? Small-group tour? Private tour?”

Perkins $3 for a half day, $5 for a full day

Frye $3 to $10

Schlichter “Museum guides do not need to be tipped, unless it’s an exceptional tour. For half- or full-day tours, tip $5 to $25 depending on the length, quality and cost of the tour.”

COACH DRIVER

Perrin quips, “The less a bus tour guide talks, the more I’d tip him.”

Perkins “$5 to $10 for one day, less per day on longer tours.”

Frye $3 to $5 per day

Schlichter $5 per day for the driver, and $8 to $10 a day for the guide

WHO NOT TO TIP

Our panel agrees that one would never tip flight attendants, airport check-in agents, TSA agents, airport club-lounge agents, airport gate agents, airline pilots, car-rental agents and especially not, Perrin says, “the hotel bellman who wheels my carry-on (despite my objections because I’d rather keep hold of it myself) to the front desk.”