[header] How to tip a bartender [title] Tip big on the first round. [step] In some circles it's common practice to leave a large tip on the first round. Depending on the bar, leave between 50-100% to make a good first impression. 
[substeps] Some bartenders might think you want special treatment for leaving such a large tip. Don't act like the bartender owes you anything, and don't make a big deal about leaving a good tip.