This is what i can say thus far
This is a local area property tax collected by city hall and on an average property seems to be circa 7-10k per year and less if you can prove the property is empty.
Seems they can go back 11 years for recovery but they seem to be “giving one year discount” and collecting up to 10 years.
The penalty for late payment is 200 baht.
What happens if you don’t pay I don’t know. I would assume they would try to collect the debt using the courts but I don’t know of anyone where it has gone that far yet.
Loads of my clients have had this letter over the last 2 years. Some have paid, some have ignored and some are waiting to see what happens regards enforcement if not paid.
if you need to extend your property or lost your deed or anything to do with your property where you need a signature from city hall unless the tax is clear that signature won’t be made