How does the 180-day visa stay work in Thailand, and what is the difference between extension and renewal?

@Richard *****

an extension of your current stay involves going to an immigration office inside Thailand and providing the documentation they need. Every office has slightly different requirements so you should go there before you need to to find out what they are.

A 90 day report is a requirement to report the fact to the immigration office you registered your TM30 with that you have stayed in the country for 90 consecutive days. The window for reporting is two weeks before and one week after the due date. The due date is 89 days after your last entry to the country.

What you did is neither an extension, a renewal, or a 90 day report. You have a DTV which is a multiple entry visa. Every time you enter the country during the validity of your visa, you get stamped in for 180 days. That's what you just did.

You left and came back. That's all.

You can't prolong the current validity of your visa. You can get an extension of your current permission to stay (you didn't do that) or you can, with a multiple entry visa, leave and re-enter to get another permission to stay. You did that.

Your next 90 day report is due 89 days after the date of your latest entry.