The four clocks of your Thai stay — and none of the four warns you

You extend your stay in Thailand every year at Immigration, the Thai immigration service. On the retirement route that requires 800,000 baht in a Thai account. Alongside that, three other clocks run:

• every ninety days you report your address;
• before every trip abroad you get a re-entry permit, the permission to come back;
• after 180 days you become a tax resident.

Those four deadlines run at the same time and reset for different reasons. None of the four sends you a reminder.

Clock 1 — how do you extend your stay every year?

Your permitted stay ends on the date stamped in your passport on entry, not on the end date of your visa. Those two are constantly confused; look at the stamp.

You apply for the extension at the immigration office of the province where you live, usually in the last thirty days before that date.

What you bring:

• your passport;
• the TM30 receipt (see below);
• your updated bank book with a letter from the bank;
• passport photos;
• a map to your home;
• the forms.

And then the condition most people underestimate. On the retirement route there must be 800,000 baht in a Thai account in your name. As a rule that is two months before the application and three months after the extension is granted. No withdrawals in between. After that the balance may drop, but not below 400,000 baht. A balance that dips below the threshold for a moment can cost you your extension.

The Ministry of Foreign Affairs names two alternatives:

• an income certificate of at least 65,000 baht a month;
• a combination of balance and annual income totalling 800,000 baht.

The one-year extension remains "at the discretion of the immigration officer".

Clock	Time limit or amount
Applying for the annual extension	in the last 30 days before the stamped date
Balance on the retirement route	800,000 baht, 2 months before and 3 months after the application; or 65,000 baht income a month
Ninety-day report (TM47)	within 7 days before or after the due date; counter resets on return
Re-entry permit	before every departure, for one or several journeys
Tax resident	from 180 days in a calendar year
TM30 by your landlord	within 24 hours of arrival, and again after a move or a trip abroad
The O-A visa itself	from age 50; 5,000 baht for multiple entries; first stay 1 year

Clock 2 — how does the ninety-day report (TM47) work?

Whoever is in Thailand for more than ninety consecutive days reports their address to Immigration every ninety days. That is the TM47. It is not an extension of your stay, but a separate report with its own counter.

The window is narrow: report within seven days before or after the due date. Online it is sometimes possible earlier. The first report you make in person or through an authorised representative at your own office; after that it can be done online.

And this is the detail that trips people up: the counter resets as soon as you leave the country and come back. After a trip your ninety days start again on the day of return. So recalculate the date every time.

Clock 3 — why is the re-entry permit the most expensive mistake?

If you leave Thailand without a re-entry permit, your granted stay lapses the moment you depart. Even if there are still six months on your stamp. You come back as a tourist, and the whole process starts again: Non-O (the non-immigrant visa), money in the account, extension.

The permit can be arranged the same day at Immigration or at the airport. There is a version for a single journey and a version for multiple journeys. If you go to the Netherlands or to a neighbouring country even once a year, take the multiple. The price difference is small and the mistake is fatal.