Quite a few people got caught out today as yesterday immigration offices were closed (not sure if all) for the Royal Ploughing Ceremony.
They were given overstay stamps as their entry stamp expired yesterday.
When giving extensions for tourist or exempt entries all offices will allow you to go at least 7 days prior to your stamp expiration. Most will allow 30 days and some even 45 days prior.
They add on the days so there is no downside to going early.
Don’t leave it until the last day if you can help it. You could be caught out not realising it’s a holiday (or even the weekend).
*Caveat. If you are changing the reason for an extension like marriage to retirement or tourist to retirement they’ll date it from the day you apply so you will loose the remaining days.
TLDR : Answer Summary
The post highlights the importance of timely visa extensions for expats in Thailand, especially noting that immigration offices were closed for the Royal Ploughing Ceremony, which led to some individuals receiving overstay stamps. It emphasizes the benefits of applying 7 to 30 days before the expiration of tourist or exempt visas to avoid issues, encourages early visits to immigration offices to avoid holiday closures, and warns that changing the type of extension may result in the loss of remaining days on the current visa.