Can I postpone my 90-day report until I renew my visa in Thailand?

Okay this turned into a train wreck (after Lloyd and others gave the correct answer)

After you've filed your first 90 day report in person, to use the 90 day report online web-portal you have from 2 weeks before the due date to 1 week before the due date to apply.

As a rule they do not send out emails anymore (so you have to count to 90 yourself 😮 )

You have from 2 weeks before the due date to 1 week AFTER the due date to apply in person.

BUT

once you're more than 7 days late the fine is 2000baht, and it stays 2000baht whether you're 8 days late or 8 MONTHS late.

IF you're okay with getting the 2000baht failure to file on time fine, then just wait and file a late 90 day report when you go to that office to apply for your yearly extension

Good luck to the O/P, we are done (y)

You have 7 days after the due date

Just pay the 2000 baht fine

That all depends if your extension falls within the 15 before/7 after timeframe. If not, then expect a 2000 fine.