What is the difference between TM28 and TM30, and who files the TM30 when renting a condo in Thailand?

TM28 and TM30 are both forms used in Thailand for immigration purposes. TM28 is a notification for a change of address, and while it is somewhat considered obsolete, it can still demonstrate due diligence if landlords are uncooperative. TM30, on the other hand, is a notification of a foreigner in residence and is typically filed by the landlord or property owner when a foreign national takes up residence in their property. When renting a condo, usually the landlord (or in this case, your sister-in-law) should file the TM30 with the immigration office, accompanied by the necessary documents related to the lease.