Re-entered Thailand on 11 June, and using THIM notified my address. On 22 June submitted paperwork for 1 year extension of stay, again notifying my address. I know it doesn't really make much difference in my case, but I'm curious as to which date is used to calculate the 90 day report date?

8 minutes ago, Wotsup said:

Re-entered Thailand on 11 June, and using THIM notified my address. On 22 June submitted paperwork for 1 year extension of stay, again notifying my address. I know it doesn't really make much difference in my case, but I'm curious as to which date is used to calculate the 90 day report date?

Normally your extension doesn't change the date of your 90 day report so it's 89 days (date of arrival counts as 1st day of the 90 days) from the date you re-entered Thailand (11th June) which is September 9th unless you exit Thailand before then.

NB. I say "Normally" as some offices will (or at least used to) update your 90 day report for your 1st extension but generally it's 90 days from date of entry

Edited 16 hours ago16 hr by SamSpade

48 minutes ago, Wotsup said:

On 22 June submitted paperwork for 1 year extension of stay, again notifying my address

Is this a first extension from a Non O

90 report is only connected to extension for first one.

Assuming you were already on annual extensions then first reply has you covered.

I get Sept 8.

Adding 89 days to Thursday, 11 June 2026 results in Tuesday, 8 September 2026.