I tip her about 20% of the total bill, she's the owner of the salon and I've heard that it's a nono to tip them but she doesn't seem to mind it! She takes good care of me and charges me discounted prices because I have short hair and have to come in often for trims. especially now that I'm growing it longer, I need a trim every 4 weeks to not end up with a mullet! She charges me mens pricing for highlites, which I appreciate. I've been seeing her for two or more years and she has always provided consistant service and is able to fit me in on very short notice. I tip her well because she does a great job, and I like her a lot as a person.
I also tip if I get eyebrows waxed, or nails done or any other service provided. People in the service industry work for tips, if you think about it they usually have to rent their stall and what not. Sometimes at salons gratuity is included in the bill, in that case Idon't add any more to it.