I'm still waiting for an apology from anyone who said I was full of it when I said extending the DTV in country would have similar requirements to getting it in the first place. I got called a fear monger.
some agents also send your documents to another immigration office than the office you're supposed to go to. But it's the office in which they have a contact.
In future years, an immigration officer may wonder why you've been living in one area and getting your extension in another.
A DTV does not require health insurance. I'd suggest you read up on extending the visa in-county vs heading out of the country and re-entering, well before your first 180 days are up. Now, would be a good time.
Phuket is very easy. They have a drive through window. It takes one minute. You hand them your passport through the window and they hand it back with your new report stapled in your passport.
It's not controversial that 180 days in Thailand in a calendar year makes you a tax resident. It's not scare mongering to state that fact. Anyone who doesn't believe it can simply Google it and come up with dozens of references. This one is from Siam Legal.
"Tax Resident: Anyone who stays in Thailand for more than 180 days cumulative (not consecutive), regardless of nationality or residence status in Thailand."
A double tax agreement between two countries lays out what is taxable and what is not. It's similar to a contract and it varies depending on your country. It doesn't usually automatically exempt you from paying taxes.
From Wikipedia
"A tax treaty, also called double tax agreement or double tax avoidance agreement, is an agreement between two countries to avoid or mitigate double taxation. Such treaties may cover a range of taxes including income taxes, inheritance taxes, value added taxes, or other taxes."
Usually dtas mean that certain types of income aren't taxable, and/or you might be able to deduct some or all of the taxes paid in one county, against the tax levied in another.
Again, this is not scare mongering. These agreements are readily available on the internet to read for yourself.
Whether or not the Thai government will aggressively enforce taxes or not remains to be seen. There are deductions available as well. Many people won't owe a thing.
But anybody who says that facts are scare mongering, but doesn't respond with facts of their own, is not worth listening to.