What are the consequences of not filing a TM.30 form for housing in Thailand?

Failing to file a TM.30 housing form in Thailand can lead to fines, typically around 1600–2000 baht, but may not result in immediate deportation. The responsibility to file this form often falls on the tenant, who must ensure it is submitted to immigration within 24 hours of moving into a property. Not having this form filed can complicate visa extension applications, as immigration offices may refuse extensions if the TM.30 is not completed. Generally, experiences shared indicate that although some individuals have faced fines for non-compliance, very few have encountered outright refusals for extensions once the form was filed later.