Is the TM30 required for a 30-day extension on a Tourist Visa in Thailand?

The TM30 form may be required for a 30-day extension of a Tourist Visa depending on the local immigration office. In general, it's advisable to have the TM30 receipt, especially if staying with a Thai national; your girlfriend can assist with the reporting process. However, there are exceptions, as noted that it may not be required in Bangkok.