We spoke to two etiquette experts, who suggested leaving a 15% to 20% tip, if you're able. Twenty percent is generous for the massage therapist and easy on the brain, which may be feeling more relaxed than ever after a massage. The math is straightforward.

Since tips are standard protocol for massage therapists, you should assume a 20 percent tip in any massage or spa treatment situation (unless a self-employed therapist specifically tells you their rate is all-inclusive). Not sure? When in doubt, always ask, says Post, who says tipping is always appreciated.

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