What’s the earliest you can do your 90 day report, and will they apply it to the end of the previous 90 days or start when you report?
TLDR : Answer Summary
You can submit your 90-day report in Thailand starting from 15 days before your due date, and this remains valid until 7 days after the due date. The next 90-day report will be required 89 days from the date you file your current report.