“Whether you get a massage on a regular basis or view it as an occasional treat, it’s important to know that tipping for your massage is considered proper etiquette,” says Sharon Schweitzer, international etiquette expert and the founder of Protocol & Etiquette Worldwide. “Because a massage therapist or aesthetician is providing a service, you should tip them in addition to the cost of your service.” Keep in mind that when you get a massage or facial at a spa, you’re paying the spa for the service you receive from the aesthetician. While the masseuse receives a portion of your payment, they are not being paid directly by you. “The bottom line is that your tip helps your massage therapist’s bottom line—they count on gratuities as income,” says Daniel Post, spokesperson for the Emily Post Institute. So how much should you tip for a massage (or other great spa treatment)? Here, find answers to all your tip and etiquette questions. Many spas provide small envelopes for tips. Simply write your therapists name on the front and a note that it was from you. No envelopes available? Schweitzer says she always slips her intended cash tip into her spa robe pocket and simply hands it to her therapist after her treatment is over. Don’t forget to simply say thank you. “Telling someone they did a good job is worth its weight in gold,” Schweitzer says. What about if it wasn’t that great an experience? “Even if your massage wasn’t the best one you’ve ever received, it’s important to give a tip even if it’s less than the standard 20 percent,” says Post. If you had a negative experience, speak with the manager or the front desk instead of withholding a tip. RELATED: How Much to Tip Hairdressers and Stylists