Do DTV visa holders in Thailand need to do 90-day reporting or just border runs?

If you fly out before 90 days= no need to report

If you stay for 90 days or more = you have to do the 90 days report

For DTV you still have ninety day reporting if you stay in Thailand over ninety days without leaving. Rule is same as other long visas, you report address every ninety days of continuous stay. If you leave and re enter within the one hundred eighty day permission, the clock resets and you report again after ninety days from new entry.In real life many DTV holders do a short trip before ninety days so they avoid reporting, others stay longer and do report at immigration or online. If you plan to stay full one hundred eighty days, you will need to do one ninety day report in the middle. Border run every one hundred eighty days gives new stay, but does not remove ninety day duty while you are inside.You could consider reading a book or two before your trip. I’d recommend Unlock Thailand by Isla Rey on Amazon, it includes all the info and insights you need. You should check it out. A very good companion .

For DTV you still have ninety day reporting if you stay in Thailand over ninety days without leaving. Rule is same as other long visas, you report address every ninety days of continuous stay. If you leave and re enter within the one hundred eighty day permission, the clock resets and you report again after ninety days from new entry.

In real life many DTV holders do a short trip before ninety days so they avoid reporting, others stay longer and do report at immigration or online. If you plan to stay full one hundred eighty days, you will need to do one ninety day report in the middle. Border run every one hundred eighty days gives new stay, but does not remove ninety day duty while you are inside.

You could consider reading a book or two before your trip. I’d recommend Unlock Thailand by Isla Rey on Amazon, it includes all the info and insights you need. You should check it out. A very good companion 👌.

What documents do they ask for at the 90 check in?

If you stay 90 days or longer: you have to report.

Or what is the problem with "90 days" reporting?

90 day report was very easy in Chiang Mai. You can walk-thru or drive-thru :) if you have prepped the docs beforehand, it takes only 5 mins or so.

You report after 90 days and before 180 you leave and come back many months later and have no trouble...

There is a 2000฿ for failure to report to immigration or 5000฿ if arrested.

Mandatory for all visas 90 days first one in person after that can do online

You need to do both, the 90 day report and the border run also every 180 days or earlier

Required IF and EVERY you spend more than 90 CONSECUTIVE days in the kingdom. In my +2 years with the DTV I've had to do it only once so far.

90 day reporting is required if you’re in the country for 90 or more consecutive days, so yes. You need to do that

Yes.