Notification of Staying Longer than 90 Days, or the 90 Days Report is required if you stay in Thailand longer than 90 days on an Education “ED” Visa.
This is not the same as extending your visa and needs to be done periodically – every 90 days– you spend at a stretch in Thailand. The cycle of reporting is required for the entire duration of your stay in Thailand, start from the date which you enter Thailand. You are required to submit the 90 days report to immigration 15 days before and up to 7 days after.
Once you report to immigration, you will receive a “Receipt of Notification” that indicates the date of your next appointment.
It is your responsibility to ensure that you submit documents to immigration. In case If the Receipt of Notification is lost, you need to get the police report instead.
The first application for extension of stay is equivalent to the notification of staying in the Kingdom over 90 days. If you leave the country and re-enter, the day count starts at 1 in every case.