I got my contract last night from our bartender and part of it asks us to choose if we want to let them have a tip jar or just pay the gratuity upfront prior to the wedding. Well I plan to pay the gratuity because it's obviously not my guests job to tip them. My question is how much do I tip? It's a open bar with beer wine and at least two signature drinks. It's $710 for two bartenders from 3 to 10 and we are providing the alcohol. They are providing soda and the cups and ice. I have found 20% but is that per bartender or do I split that? Thanks!