Will I have to pay a fine for failing to submit my 90-day report on time in Thailand?

Yes

Yes

Did you left and re-enter the country recently ?

If yes, your 90 days report on may 3rd is cancelled and a new 90 days period has started on your last arrival day. That's why the online system refused your application. Happened to me recently.

To late, it will cost 2000฿

I think they never look at the 90day report when leaving the country. But in case they did and you are in the 7 days (past due date) zone, all is still good?

When I left last time I was 2 days over the due date and was thinking if I should have been getting the new stamp, but it was in the middle of

Songkran and didn’t want my passport

to get wet…

Probably yes

Okay people I deleted the unrelated comments.

Let's all get on the same page

You have a THREE WEEK WINDOW to file a 90 day report in person at the immigration office (that's 2 weeks before the due date down until a 1 week after the due date)

There is no slack cut for weekends OR holidays, it's just a 3 week window period.

IF you can't get it done during that time frame when you DO go report you will get a 2000baht fine. <- You are NOT ON OVERSTAY and it has nothing to do with the visa/extension you're here on,

It's nothing more than a failure to file a 90 day report on time fine. It's 2000baht it starts on the 8th day after your report was due. The fine does not increase so whether you're 8 days or 8 months late it's the same fine when you go file

You will get a 2,000 baht fine. You can do your 90 day report 15 days before the due date and up to 7 days after the due date, so you have had basically 3 weeks to do it.

Are you asking this question rhetorically?

You could have filed a 90 day report in person from 2 weeks before the due date (April 19th) down until 1 week after the due date (May 10th)

You will get a 2000baht fine when you go to file the report Monday 🙂

Yes, you should get fined 2000 baht on Monday.