Tipping on a Pre-Tax vs Post-Tax Base: A Reference Sheet for Engineers Who Build the Math

If you have ever wired up a "calculator widget" in a checkout flow, expense module, or hospitality backend, you have probably discovered that the boring question — do we tip on the pre-tax subtotal, the post-tax total, or something in between? — is not boring at all. It is a tiny rules engine wrapped in regional habits, rounding quirks, and... Weiterlesen