What are the TM30 registration rules for expats in Thailand, and who is responsible for fines if not registered on time?

The TM30 registration process requires that a foreigner notify immigration within 24 hours of staying at a new residence. While it is the landlord's responsibility to register the tenant (foreigner) with the local immigration office, the foreigner also holds a personal obligation to ensure this is completed. If one fails to register on time, there may be fines associated with late registration, typically directed towards the landlord rather than the tenant. However, experiences shared in the community suggest that officials can be lenient. To register, you can visit a local immigration office, or if necessary, use the TM30 report slip from a hotel if you choose to stay there temporarily.