In 2026, politely not tipping is entirely dependent on the cultural context of where you are. In countries like Japan or South Korea, tipping is not expected and can even be seen as an insult to the professional pride of the staff; here, the most polite way to "not tip" is to simply pay the bill as presented and offer a sincere "Thank you" (or Arigato gozaimasu). In Western countries where tipping is standard, like the US, not tipping is usually seen as a sign of poor service. If you choose not to tip because the service was truly abysmal, the most polite approach is to speak with a manager to explain the issue rather than just leaving zero, as this ensures the lack of tip is seen as feedback rather than forgetfulness. In many European countries, a service charge is already included in the bill, so "not tipping" extra is the norm and requires no apology—just a friendly nod as you depart.