And THAT'S why the moderators always say; Use the correct names !!!! SO many people call a visa exempt entry a visa or visa on arrival or in your case touristvisa.
Also extensions of stay are so many times named visa.
, it's "quite a forrest" indeed. You got a lot of visa and extensions. The best group for visa and extensions is Thai visa advice. So without "and everything else".
Learned a lot by only reading questions and answers.
but with a border run, you buy a visa in the country you run to but with a border hop or border bounce, you stamp out of Thailand, go in the other country and many times you can turn around and stamp in in Thailand again with e.g. visa exempt 30 days (from 1st of oct. 45 days). By land only 2 times allowed. Good luck ! 🤞
And specially beCAUSE it's a bit confusing, you have to prepare carefully. Invitation letter with explaination of your situation and reasons she has to go back. Some kind of guarantee letter of your income and you give her a place to stay and financially support her. Phone number that the Embassy can reach you 24h. Photo's of you both. How older the better. Etc etc. I even then got the tip that she dresses properly going to the Embassy. I know many people here who got refused a Schengen visa and surely not only Polish Embassy. Many refusals happen that people are too quick without 110% preparation. And yes, as said here; main reason is proving she goes back.
. As you can read his STV is void and now he is on Covid extension. Really don't know in this case. But OP wants to do a border hop, so at return (after 1st oct.) he gets 45 days visa exempt entry anyway. Also maybe even not needed as
Concerning the 800k฿ for year extension, SHOULD you go for the individual non imm. O, you both have to have 800k฿ in individual bank accounts. So two separate. When having a joint account it must be double, so 1,6 million. But....if you have an income of more than 65k฿ a month each, you still can get an affidavit (income statement) from your embassy. Also a combination method is possible. So money bank account plus 'year income' together, must be over 800k฿ each. And take care the money must be in the account 2 months before your year extension request.
. Made it also myself sometimes when I still lived in the Netherlands. For that one time I use it over here, e.g. coffee or apple pie, the can is easy. But