in the context of filing a tax return, any monies that you acumalate and don,'t spend (aka savings) after the
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/24 may be subject to tax after remitting it to Thailand, depending on whether the initial source is assesable or non-assesable. Monies accumalated and not spent (savings) prior to
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/24 or prior to being a tax resident are non-assesable regardless of original source after remitting to Thailand. The word income reflects you receiving incoming money from a foreign country regardless of original source.
Theres a free shuttle bus from gate 4 (i believe) building B to the main road, and then a couple of hundred metres walk to the gov complex station on the pink line.
by law (2021), if returning to an address that you are registered to (via a TM30) before the notified checkout date, you do not have to file a new TM30 regardless of inter-province or out of country travel. However, if dealing with an immigration officer, they may require a new updated TM30 is presented, for them to complete your required transactions.
You missed the communication in Nov last year to all foreign nationals with K bank accounts requesting the filing of several forms (only 1 for non USA nationals) by a mid Dec deadline.
Make sure you checkout the Immigration DTV extension documentation requirements first, they appear to be possibly more demanding than the MFA initial visa requirements.
Are you sure its not "eg: TM30", which is a possible existing document if you are already residing in Thailand and have had to leave purely to obtain a new visa and returning to same address within the check-in period.