What should I do if I've lost my 90-day report slip before leaving Thailand?

If you aren't in country continuously for 90 days, it's not required.

You’re fine — losing the 90-day slip is basically a non-event.

A few key points people mix up:

• The slip itself is NOT a legal document — it’s just a reminder of your next reporting date. Immigration already has your record in their system.

• Airport immigration does NOT ask for or care about your 90-day slip when you exit Thailand. That’s handled separately from your stay reporting.

• If you leave Thailand before your 90-day report is due, the clock resets when you re-enter. Your new “day 1” is your re-entry date.

The only thing that actually matters is this:

👉 If you are staying continuously in Thailand past the due date, then you must report (slip or no slip).

👉 If you leave before the due date, no report needed — problem disappears.

One important caveat people forget:

If you’re on an extension of stay (retirement, marriage, etc.), make sure you have a re-entry permit, otherwise your extension is void when you leave.

Bottom line:

No slip = no problem. Leaving before due date = resets everything.

Lost 90 day reporting slip isn’t an issue for leaving the country as long the reporting is done, airport immigration doesn’t care about the slip.

Leaving (with an exit permit!) resets the 90 day clock to zero.

Nothing to worry about. The slip is just to remind you of the date. Calculate a new date when you return