Gratuity expectations vary widely depending on the situation, with 15 percent being standard for a server at a sit-down meal. 20 percent is also quite common, especially if the service is exceptional. 10 percent is standard for curb delivery, or for a particularly complicated take-out order, according to Emily Post.
Bartenders should typically receive a dollar or two per drink order, and should be tipped similarly to all other servers when they deliver food. Anywhere from 50 cents to $3 is fitting for a bathroom attendant, depending on the quality of service rendered. For large events such as weddings and funerals, each server normally receives approximately $25, disc jockeys $50 to $100 and the bartenders either $25 each or 10 percent of the entire bar tab.
Common gratuity for barbers, hair stylists and other cosmetics services is 15 to 20 percent of the total bill, split if more than one person performs the service. Taxi drivers are normally given a similar amount, with an extra dollar or two added for each bag they may handle. Valets are given no more than $5, to be handed over when the vehicle is returned. Bell hops may be given $2 for the initial bag with another one added for each additional piece of luggage. It is sufficient to leave hotel or motel cleaning staff $2 to $5 per day of one's stay, left with a note in an obvious location indicating "for housekeeping" with thanks.