What are the consequences of leaving Thailand without filing a 90-day report?

If you leave Thailand without filing your 90-day report, the primary consequence is a fine of 2,000 Baht, applicable if you are later required to report this at immigration upon re-entry. Although there are no additional formal penalties, your immigration record will reflect the late report, which may cause complications the next time you interact with immigration officials. Some users note that there may be a grace period for exiting the country, but confusion exists about the specifics. It's advised to keep the report slip out of your passport when departing to avoid unnecessary questioning.