While you are legally obliged to do a 90 day report the consequences of failing to do so are not severe. Border immigration don't check, so the only time it will ever come up is if you visit an immigration office and they notice. In which case you will get a 2k baht fine

@Diana ********

the official rule is that you can't get an extension beyond the validity of your passport. No idea how you managed it last time

The policy varies by immigration office, you need to ask them what their policy is

They won't give a extension beyond your passport validity. You will need to apply for another extension before this one expires and after you have a new passport. As

@Stuart ********

says you will also need to transfer stamps to your new passport when you get it, update bank records, driving licence etc

The new Bangkok Bank policy relates to getting a certificate from the bank for immigration for an extension of stay etc. They require your funds either 400k or 800k to be maintained in your account for 4 months

@Erik *******

sorry for the confusion, I've edited my post. You can't get a 30 day extension but you can get a 60 day extension based on visiting Thai family. And yes you can still apply for the 12 months extension after this.

You're also going to need that done to get a 12 month extension at immigration. I think it may be enough for you to get a 60 day visiting Thai family extension if you need to buy time.

Simply because you stayed the full length of your entry stamp and returned immediately after a short trip. The immigration officer is just doing his job, and multiple border bounces on visa exempt are no longer a thing, immigration is cracking down on them. Even a tourist visa can be problematic as your behaviour is not typical of a tourist, normally tourists just come for a few weeks

Business as that's your primary purpose

@Vin ********

there are only two ways to get an extension on a Non-O visa based on being over 50 inside Thailand if your embassy won't provide an income affidavit. 1 you need 800k baht in a Thai bank for 2 months before you apply for the extension or 2 you need a full 12 months of transfers from overseas of a minimum of 65k baht each and month before you apply for an extension. There is zero correlation between how you obtain the visa from a consulate and the requirements to obtain an extension inside Thailand