Though common advice says to tip 15 percent to 20 percent, it may not always be obvious how much to tip for a service — or ...

Unsurprisingly, a higher percentage of the top income earners reporting giving above average tips between 15-20 percent. The survey also found that six in ten service workers say they rely on tips ...

a flat tip per item may be more appropriate than a percentage. How much to tip bartenders: About $1 to $2 per drink or 15% to 20% of the tab, according to the Emily Post Institute. If you order ...