What happens to my O retirement visa if I renew my passport while abroad and re-enter Thailand?

When you renew your passport while on an O retirement visa and re-enter Thailand, you should present both your old and new passports at immigration. They will stamp your new passport and note that you are entering on a retirement visa from the old passport. Additionally, you need to visit the immigration office that issued your visa to have your visa transferred to the new passport. Don’t forget to file the Thailand Digital Arrival Card (TDAC) using your new passport number.