When should I apply for a one-year extension on my non-immigrant retirement visa in Thailand?

If you arrive in Thailand tomorrow, you will have to apply for a 1 year extension of stay before the 10th of December. Good luck.

You must have a bank account in your name only with 800k baht in it for 2 full calendar months before applying for the extension

Once used to enter Thailand your actual visa is irrelevant. It’s used. Done and dusted. What counts is the stamp in your passport that says “allowed to stay until”.

You’d need to apply for the year extension prior to that date. Don’t leave it to the last minute in case of any hiccups. Most offices allow you to apply 30 days prior to that date.

You can apply at some offices during the last 45 days, others 30 days of your new Admitted to Stay period which you get on entry.

Be aware that you need to meet the financials, like 60 days before application 800.000 Thb in a Thai bank account in your name

With a Non O Visa as retiree, you will be stamped in for 90 days on arrival into Thailand..

When you get into Thailand visit your local Thai Immigration office and ask for their requirements for the One year extension of stay as retired.

VERY Early on you will need to open a Thai bank account in your name only and deposit by international transfer 800,000 Thai baht.

That he has to be done within the first 30 days of your arrival.

Two months before your 90 day stamp ends, you make an application for the One year extension of stay as retired.