When is the due date for my 90-day report in Thailand?

In Thailand, you are required to do a 90-day report 90 days after your entry date, which can be found on the triangular red stamp in your passport. If you haven't received a report slip by the appointed dates following your entry, you should still report 90 days after your entry date. It is advisable to complete the report between 80-90 days from your entry.