You’re sitting in a restaurant and have just finished your meal. Your server has been hard-working, respectful, punctual and attentive, but you decide to walk out without leaving a tip.

Growing up, I was told that tipping 20 percent is customary. Now, I see some servers that are happy to go home with 10 percent in tips.

Many times while I was working, people haven’t left a tip at all—not because service was bad, they just must’ve felt like not tipping that day.

Servers depend on tips to make up for their below-minimum-wage salaries.

Most servers make anywhere from $4 to $6 an hour without tips, and they also don’t receive benefits of any kind: vacations, health insurance or paid sick/maternity leave.

The federal government also expects customers to tip at least 15 percent. This dictates the $2.13 minimum wage for servers.

Servers also must tip-out the restaurant, bussers, bartenders and hostesses, at the end of the night. This means that if you don’t leave a tip, the server is forced to pay a portion for your meal.

A survey by CreditCards.com showed that 10 percent of Millennials routinely don’t leave a tip. When offered preselected tip options, on a tablet or physical receipt, 1 in 6 chose the lowest amount and 1 in 5 selected zero.

According to USA Today, about 1 in 3 Millennials tip less than 15 percent when dining out. They are also more likely to splurge on a meal than older generations, saying they would be willing to pay as much as $213 for a meal compared to the $123 that people older than 65 said they would pay. Consequently, servers could be serving a larger bill with a higher chance of being stiffed.

Tipping habits aren’t just about age, according to a national survey conducted in December 2013. They are also correlations between gender, location and income.

The average tip for women is 20 percent compared to 16 percent for men. Customers in the Midwest and Northeast are more likely to tip than people elsewhere; in the South, 7 percent of people said they frequently don’t tip their servers. And married people with college degrees are more likely to tip than a single person.

It is important for everyone to tip. You may think that tipping just goes toward the server’s pay, but you’d be wrong.

Tipping also benefits you. You are more likely to receive better service if you have a reputation for tipping well.

Why would you skip out on quality service at the price of throwing a couple dollars on the table? Do the right thing and tip your servers.