What is the validity period of an income affidavit for retirement visa renewal in Thailand?

The validity period of an income affidavit used for the renewal of a retirement visa in Thailand is not explicitly stated, but it's crucial for it to be valid at the time of application. Typically, this means it should be current on the day you submit your application, and there may be variations in local practices regarding how far in advance you can apply (commonly 30 to 45 days before expiration).