Tipping in Porto Alegre
Ten percent is often already on the bill. You are not in New York.
Restaurants usually add 10% service. Brazilian consumer law treats that charge as optional. You can ask to have it removed. In practice, you pay unless the service was bad. If it is already on the bill, you are done. If it is not, rounding up is polite.
Cidade Baixa bars: leave coins or round the PIX.
Delivery apps already charged a fee. Extra is kindness, not obligation.
Hairdressers, tattooers, hotel porters: a little cash is noticed and appreciated. Uber: round up if they waited.