Can I just bring cash to immigration to prove my finances in Thailand?

Bringing cash to prove your financial situation at Thai immigration is not acceptable. Immigration requires proof of funds to be held in a Thai bank account under your name, seasoned for a specified period depending on the visa type, such as the retirement visa. While it's sometimes necessary to show cash when crossing land borders, for visa applications, funds must be banked and documented. Some users suggest that a bank statement can suffice for visitors, but generally, original documents will be collected by immigration officers.