If you are a foreigners with high income retirees want to apply for LTR these are the requirments you need :
Must present a health insurance policy covering medical expenses in Thailand no less than USD 50,000. The remaining coverage period shall not be less than 10 months on the date of the application, OR provide evidence of savings of at least USD 100,000 held in a Thai or overseas bank account for no less than 12 months before the date of application.
High earners must have proof of personal income of at least USD 80,000 annually at the time of application
In case of having personal income only between USD 40,000 to USD 80,000/ year, the applicant must invest at least USD 250,000 in Thai government bonds, foreign direct invest or Thai property