A question about tax residency status, please. I know if a foreigner stays 180 days they become resident for tax purposes. If they left Thailand before day 180, how soon can they return and begin another 180-day countdown?
TLDR : Answer Summary
In Thailand, a foreigner is considered a tax resident if they stay for 180 days or more within a calendar year (January 1st to December 31st). If they leave before reaching 180 days, they can return anytime after January 1st of the next year to start another countdown. This tax residency is cumulative within the calendar year, and discussions stress that staying more than half the nights in a year makes one a resident, irrespective of the visa held.