@Teevee *********
you have a "window of opportunity to file from 2 weeks before the due date until up to 7 days (one week) after the due date.
That's a 21 day window to file and as long as you do it in that time frame you're okay.
So if your 90 day report receipt or the paper that says when you first file says the 19th you have until they close the doors at 4:30 on the 26th to file without getting a fine.