Will leaving Thailand for a holiday with a Non O visa make my visa null and void?

Yes there is but it is after Immigration so when stamping out you tell them you need a re-entry permit and they will direct you where to go

@Stephen ********

yes there is. But it's a little different there. You have to get stamped out or go through the automated exit gate first, and then loop back around to the re-entry desk. Just ask an immigration officer if you need assistance on locating it.

@Randy ******

No, they won't. Who told you that?

@John *********

It's totally ok the way he's thinking.If he return back home after he opened a bank account in Thailand and over time transfer a total of 800k into his account, then when he's back in Thailand when he's retired,he basically just has to kill time until the 1 year extension. He already has the money needed in the bank,and it's smarter to apply for the Non-O back home instead of doing it in Thailand. It's only one visit to immigration.

@Stephen ********

You need an official address when applying for a bank account.A hotel address doesn't work anymore. Some banks wants proof of having at least a 1 year contract.It differs between banks and branches. Go for Bangkok Bank, Kasikorn Bank or SCB.

@Stephen ********

it makes sense. Arrive on a 90-days Non-Imm-O visa, you get stamped in for a 90-days stay permit. Get the bank account opened. Then actually you can holiday outside of Thailand. You can theoretically buy a single re-entry permit for 1000 THB for the intial 90-days stay permit as this would keep these 90 days alive, yet it would only make sense if your plans include more days in Thailand until this 90 days stay permit expires. If you like to stay longer, then just exit Thailand, do your holidays abroad and re-enter Thailand visa exempt, which would get you a 60-days stay permit. For this visa-exempt entry I would make sure I got the three famous proofs at hand in case I get questioned at the entry point (onward travel, cash 20,000 THB and proof of acomodation)