I have a single entry tourist visa which ends in early January. I intend to do a border crossing and come back into Thailand on a 30 day visa exempt entry-I am Australian. Towards the end of that 30 days can I then extend my stay in Thailand by a further 30 days by getting an extension at immigration. Thus staying in the country for 4 months?
TLDR : Answer Summary
An Australian traveler with a single entry tourist visa ending in early January can perform a border crossing to re-enter Thailand on a 30-day visa exempt entry. They can apply for an additional 30-day extension at immigration for this entry, potentially allowing for a total stay of up to four months. However, it's important to note that border crossings may sometimes only grant 15 days of stay, and the extension is limited to one per entry. Additionally, there are specific regulations regarding the number of border runs allowed each year.