Thai tax residency is not determined by being at least 180 days in Thailand continuously, but by being at least 180 days in Thailand within a calendar year. If this is continuous or not does not matter at all. Only the total number of days counts. So your visa run proposal unfortunately does not work. But you can of course live outside Thailand for the remaining 365 -179 = 186 days and as of today this would avoid tax residency in Thailand
I posed my dilema in another post but according to this it seems I can get a 30 day extension to my current visa stamp that expires Oct 20, and if I run to Hong Kong from Nov 7-10, I will get another stamp on arrival that would take me to ~Dec 10.
Do i understand this correctly?
(Likewise I could leave the country just before Oct 20, come back, get stamped then leave again on my HK trip and get another stamp on arrival???
Can i get my in-person extension anytime or do I need to wait until closer to the expiration date of Oct 20?