There have been a lot of talks about TM30 among expats. So here is an infographic created by Bangkok Post on what is TM30 and how does it affect foreigners in Thailand.
The TM30 is a form that landlords which provide accommodation to foreigners must submit to the authorities within 24 hours of the arrival of their tenants.
By law, landlords must submit the form to authorities every time their tenants return to the country.
Long-term foreign residents are also required to report their whereabouts if they spend more than 24 hours at places other than their registered addresses.
Landlords and tenants who fail to comply face fines of between 800 to 2,000 baht, although the sum seems to differ across different immigration offices.
The reinforcement of regulations regarding the so-called TM30 form is outlined in the 1979 Immigration Act.
Sources: Bangkok Post, Thailand Bloggers