During a meeting at the India-Thai Chamber of Commerce on Thursday night, Immigration officials from Division 1 at Chaengwattana, made it very clear that a TM30 form has to be filed each and every time a foreigner (non-immigrant) goes away for more than twenty-four hours to another province in Thailand. This is in addition to when the foreigner returns home from abroad. The only exception are foreigners who hold permanent residence. Although this is an old law, not all Immigration offices around Thailand are enforcing it. But, this is the first time I have heard that Chaengwattana have an intention to enforce it now.
An example that they gave us was if you live in Bangkok but have a condo that you own in Pattaya. If you go away for the weekend, you must file a TM30 yourself as the owner to say that your new address