Everything else in a lease you can read for yourself. This is the only item where someone else carries the duty and you carry the outcome. That asymmetry is the whole problem, and it is why it belongs at the top of your list rather than buried in it.
The fine on the landlord is small, a maximum of 2,000 baht for an ordinary owner under Section 77. The cost to you is not a fine, it is time. Some immigration offices will not accept a 90-day report with no active TM30 on file. An extension of stay can be delayed or refused over it. You find this out on the day, in a queue, with a landlord who is not answering the phone.
A landlord who has done this before answers all three in one message, usually with a photo of a previous receipt. A landlord who has not will change the subject, tell you it is not necessary, or say the building handles it. Changing the subject is the answer. You have learned what you needed to know for the price of one message.
"Yes, we file for every foreign tenant. I do it online through the Section 38 portal, usually the same day you move in, and I will send you the receipt screenshot." Since May 2025 online filing is standard, so a landlord who still describes a trip to the immigration office is telling you they have not done it recently.
Two options, and neither one is "sign anyway and hope".
Walk. A landlord who will not do a free, twenty-minute, legally required filing before you have paid them anything is showing you how the deposit conversation will go in twelve months. This is cheap information and you should treat it as such.
Or file it yourself. It is not your legal duty, but it is possible in practice. You need copies of the owner's ID card and the tabien baan (the blue house registration book) for the unit. If a landlord will hand those over, they are cooperative enough to work with; if they will not, you are back to the first option. Some immigration officers will also phone the owner on the spot if you explain the situation and ask.
These get confused constantly and they are different obligations with different owners. The TM30 is filed by the landlord, once, within 24 hours of you arriving at an address. The 90-day report is filed by you, every 90 days, saying you are still in the country. The trap is that the second one can be blocked by the first one missing.
Not just at move-in. A fresh notification is generally needed each time you return to that address after leaving the country, and any time you change address. Practice varies between immigration offices, which is one more reason to have a landlord who has done it before rather than one who is learning on your application.
Tell me your dates, budget and district. You get three places whose owners actually do the documents, and a straight note on what each one will and will not put in writing.
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Not immigration or legal advice. This page explains what a landlord and a lease have to do. For the application itself use a licensed agent or the official channels. We rent condos, that is the part we know. Rules checked August 2026; both the deposit regulation and the DTV financial test changed within the last year, so check the date on anything you read about this.