If you've got 400k+ baht in the Thai bank ( for 2 months prior to application), just go that route for renewal, just using letter and statements obtained from bank ( no older than 7 days), plus copies of bank book upto and including application date. Dont go down the work permit route if you can help it. I'm married and have a work permit, and my employer organizes my visa renewal every year, and we always take the banked money route as much less paperwork.
Legally no, if your returning to same address within the check-in period. So your breaking no law by not doing it again. But if you have to interact with an imigration office in person many like to see an updated one before they will sign off what ever you went there for.
The online site now effectivly says you only get a 7 day window to report online ( cant recall the exact wording), but if you have less than 7 days to go before the reporting date your application will most likely be rejected.
agree, but its mathmatically impossible to do it more than once a year, unless you get the 180 day extension and leave and come back within 5 days of receiving it.
The korRor cant be more than a month old, (just had to get mine this morning), and the bank letter and statement must be no older than 7 days.But the copies of your bank book must be upto and including the application date. That means a quick withdrawl in the morning ( not taking your balance below 400k), update the bank book and photocopy the last page, replacing in your pack the previous copy if you made it.