Can I apply for a 12-month extension shortly after entering Thailand on a 90-day Non-O Retirement Visa with the required funds?

Upon entering Thailand with a 90-day Non-O Retirement Visa and having maintained the required 800,000 THB in your bank for over 2 months, you typically need to adhere to specific guidelines for applying for a 12-month extension of stay. Most immigration offices allow you to apply for the extension only when you have 30 days or less remaining on your current stamp, although some may permit applications when you have 45 days left. It is advisable to verify the rules with your local immigration office.