The usual frame
A tip is often calculated as a percent of a bill. Customs vary by city, venue, and pretax vs post-tax base—pick a consistent rule you can defend.
Splitting
Per-person totals should include tip and tax if your group agrees. For uneven orders, split the tip proportionally to what people ordered, not just evenly—unless simplicity wins the social contract.
Use the calculator
FAQ
- Should I tip on tax?
Practice varies. Many people tip on pretax subtotal; others on the total. Consistency matters more than dogma—choose and move on.