@Harry *******
A TM30 is a document that the property owner submits to the Thai immigration office that gives the immigration office information about the foreigner. It must be filed no later then 1 business day after the foreigner starts staying in a location (AT SOME IMMIGRATION OFFICE).
You can find a good (slightly outdated) FAQ at
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A good Bangkok Post article at
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75/thailands-tm30-revisited-clarifying-the-confusion-
And a movie the Thai Government made about why the TM30 is important, in Thai, subbed in English.
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