Can I submit my 90 days reporting online or do I need to visit the immigration office, and what happens if I am late?

The FIRST thing to do when wanting to file 90 day reports online is check with your immigration office and see if they participate in the 90 day online program. Some offices have "opted out" of participating in it.

IF your immigration office will let you do online reporting, like

@Al**

mentioned you have to file one 90 day report in person to get into the data base. After that you can apply for a 90 day report online from 15 days before down until 7 days BEFORE your actual due date.

The window of opportunity to report online is different than the one to file reports in person. In person you can do a 90 day report from 15 days before down until 7 days AFTER your due date with no fine.

The fine for failure to report on time is 2000baht.

Some offices also allow mail in 90 day reporting too. Again it's best to check with your particular office and see what they allow.

"Applicants can submit this online application within 15 days but not less than 7 days before the due date of notification"

So 15 days in advance is not correct.

Between 15 and 7 days before due date is correct.

And "Overdue notification is not accepted via internet. Applicant must contact the nearest Immigration Office in person. "

The first 90 report you have to do in person at your local immigration. Next ones you can do on line

For more info if your submission date is not in advance with 15 days, you need to submit at immigration (but not sure there will be any update for the regulation or not)

For report on online, its need to submit with 15 days in advance from due date, and

you can late report submit after 7 days from due(in case of over due report penalty per day of 500 maximum of 2000)