In Bangkok, it's more like a hit-or-miss situation if you will be asked for a TM30 receipt or not for a tourism extension. Better to get and bring a TM30 receipt unless you are happy to make another trip to Laksi in case.
, wondering how to be "cost effective" for four months... METV is 5000 baht equivalent, SETV is 1000 baht (and extension is 1900 baht). either way, they need to leave Thailand at least once.
Have your wife register an account on the TM30 system. Then report you there to get a receipt from the system.
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You can check details on the user's guide from the link at the bottom of the login window, such as what documents you need to register an account, etc.
Those are OR choices. You meet one of them to fulfil the financial requirements for an in-country Non-O visa/extension based on being married to a Thai.
All you can do is go to your local office and talk about what you can do.
Bring fixed air tickets (an open ticket wouldn't do the trick) as proof that you are not in Thailand during the application window.
Some offices may allow you to apply for 1-year extension in advance when you can prove you are out of Thailand.
The worst thing is they say no. Then, you just start over to get a new visa, Non-OA again in your home country or Non-O based on being over 50 (for 90 days) inside/outside Thailand.
There is a small office room (combined with an overstay fine counter) just behind the passport control counters at DMK. It's open for 24 hours. Tell the officer at passport control that you need to get a re-entry permit there. He would direct you where you go.
Usually, you need 10-20 minutes plus. put some more in case the officers are not enough at that time of the day, around 4 am.
You will pay the fee of 3,800 baht for a multiple re-entry permit and a 200 baht service fee. If you bring all the necessary documents including photos, you may not have to pay the service fee.