After checking, you're right. According to the Royal Thai Police Notification published in the Government Gazette on 16 June 2020 (effective 30 June 2020), once a TM30 is properly filed for a registered address, you *do not* need to file a new one when returning to that same address — even after inter-province or international travel — as long as it’s before the notified checkout date (or if it’s a null/open-ended date on a long-term registered home address).
Adam Ffs Just depends on if the accommodation is being lawful or not. I spend 240 nights bicycling around Thailand... I was only asked for my passport 2 times, of course I was staying in very cheap accommodations.
Legally... every time. Also every time you spend a night away from your house, you need to resubmit it also when you return. The advice here is not legally correct from most people.
In practice, if the person/guest is never going to visit a immigration office then you likely don't need to worry about it, if they plan to do an extension whist at your place... it's a very good idea.
If you're leaving your house and stay in accommodations that actually follows the law and lodge their guests with the government (ie real hotels) then you should relist yourself back home when you return. If you stay in cheaper motel/homestays that don't follow the law and don't send all the paperwork to the government then likely it looks like to the government that you've never left your house.
Also legally we should all be doing TM28 every time we are in ANY province
for more than 24 hours, so if you're doing a road trip across the country you should be doing one just about everyday :)
50yo immigration laws are crazy! Over my 19 years here the laws have been enforces in a dozen different ways, and it's often different in different provinces as each head of station follows the rules as they want.
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