When returning to a long-term home in Thailand after visiting another country, do you need to file a new TM30, or update an old one?
IT DEPENDS. There has been a lot of discussion about this. In Bangkok, no; in Phuket, definitely yes. In Chiang Mai… nobody seemed to know for sure.
I finally have good information on this, because I was paying an agent to renew my visa and asked her. She says you don’t have to report for 2 months. That’s a lot of latitude—chances are you’ll be reporting for some other reason before that time is up.
So that’s the current rule in Chiang Mai. Ask again next month, maybe it will be different. :-D
TLDR : Answer Summary
When returning to Thailand after traveling abroad, whether you need to file a new TM30 depends on the location. In Bangkok, it is not required, while in Phuket, it definitely is. In Chiang Mai, the rule is less clear, with one source stating you do not need to report for 2 months after returning. The topic is subject to change, and local enforcement can vary.