Do I need to leave Thailand every 3 months with a multiple entry NON-O visa?

@Steve ******

, do you have anything to back up your theory? As said, I was told by my IM that I could not get an annual extension until my multiple Non-O had expired.

@Henrik ***

I'm not assuming anything, the yearly extention will override your visa because it will expire after your visa expires, unlike a 60 days visit Thai dependants extention.

@Steve ******

, again, my Immigration refused to do it. And also, you do not consider the situation I am talking about leaving end re-entering Thailand. Maybe a 60-Day family extension would be possible, not sure. But this is only possible one time in the "lifetime" of your original Non-O. i.e. to get a second family extension you will need a brand new non-extended Non-O. Somehow you assume that when getting an extension on a multiple Non-O it is automatically converted into a single or zero-entry Non-O. It starts to be very creative.

@Henrik ***

You haven't got 2 visas at the same time. You've got a visa and an extention of stay, the same way you can extend an entry on a multi-entry tourist visa. The point is why would you? But it is possible, you dont need to wait for the visa to expire. The extention of stay stamp overides your visa.

@Steve ******

, that contradicts the principle of not being possible to have two visas at the same time, and also my experience from trying to do what you propose. There is basically no reason to extend a Non-O still valid, that was the explanation my IM told me. Let's say some IM would extend it without canceling it in the first place, then what will happen if you want to leave and re-enter Thailand? Now you would exactly have two visas, i.e. your multiple Non-O is still valid, and your Non-O extension also being valid for re-entering with a re-enter permit. Which one should they stamp you on?