This topic was not about bank accounts but I can assure you that TB is a compulsory requirement for every thai national for opening a bank account. Not all foreigners have TB so luckily there is the COR option reserved for them also but if you have TB you WILL be much more likely to succeed opening the bank account. So to answer the OP, yes it is beneficial to register to the official system of residence registration in Thailand and obtain TB, if possible. People mention the pink card here often. It sounds like many don't understand that the pink card alone is mostly nothing, just a queue number at the hospital at best BUT combined with the TB it is the strongest proof of residency Thailand offers. Of course the TB is a prerequisite for the pink card but in official use, such as DLT or banks, BOTH must be presented to achieve full results. E.g. If you tell a thai you have a pink card they will ask what is that. If you tell a thai you have TB they will understand. Immigrants from the neighbouring countries might have pink cards because that was the original purpose of it in the 90's.