WASHINGTON — When it comes to adding a little extra money onto the tab, millennials aren’t going to do it, according to a new survey on the worst tippers in the U.S.

The survey by CreditCards.com shows that young adults ages 18 to 37 are stingier on tipping than those older than them.

Ten percent of millennials said on the survey that they usually leave nothing as a tip for a server when dining out at a restaurant, compared to just 3 percent of those who are older.

In addition, 18 percent of millennials say that they typically decline to leave any amount when presented with pre-entered tipping options in a taxi, Uber or Lyft and at food trucks or coffee shops versus 12 percent of older adults, according to the survey.

The median restaurant tip for a millennial diner is 15 percent less than the overall median of 18 percent.

Sixty three percent tip less than 20 percent at restaurants, compared with less than half of those age 38 and older.

Also, when given a choice of pre-entered tip options, the survey said that 14 percent of millennials pick the lowest one, which is twice as many as those who are older.

Other low tippers include men, Southerners, Westerners, parents with young children, lower earners and those who are less educated.

The study was conducted for CreditCards.com by GfK Custom Research North America on its OmniWeb online omnibus. The sample consisted of 1,000 completed interviews, weighted to ensure accurate and reliable representation of the total population of those 18 years and older.