At this place it is required. They will make you feel like a loser if you don't.
Twice, I've witnessed the receptionist discussing clients and their tips with other employees. They disparaged those who they deemed to be 'poor tippers', and laughed at them. I was three feet away and I was astounded! To learn more about this place, see https://www.facebook.com/avoidanewdayspa/?modal=admin_todo_tour Find a New Spa!
It actually IS required here. They will get the calculator out and tell you to the penny exactly how much 20% is. They also reminded us that the tip is calculated from before use of any discounts, coupons etc...they were really quite snotty with us about it too.
I doubt it is required, but socially, it is expected.
Nor required, but you should
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