 Rossman adds that younger people are less willing to leave tips. It's especially stark at sit-down restaurants, where only 35% of Gen Zers always tip. Only 56% of millennials always tip at a sit-down restaurant. Rossman believes tipping amounts should be universal. We should be tipping ideally 20%. The federal tipped minimum wage is $2.13 an hour. So a lot of restaurant waitstaff are really dependent on tips.