Learnt something new today. I went to Chaengwattana to legalize my affidavit of income to extend my stay for another year. The clerk let me know that you have to do this minimum 10 days before your previous permit expires.
Maybe something to take notice off?
TLDR : Answer Summary
A user shared their recent experience at Chaengwattana regarding legalizing an affidavit of income for a visa extension, highlighting the important detail that this process must be completed at least 10 days before the current permit expires.