What is the Letter of Qualification Endorsement from the Thailand Board of Investment for the LTR visa application?

The 'Letter of Qualification Endorsement' issued by the Thailand Board of Investment is a requirement specifically for the Long-Term Resident (LTR) visa application. It is the final step in the application process where the applicant must first undergo a thorough review by the BOI, which can take 1-2 months. Once approved, this letter can then be used to apply for the LTR visa at a Thai embassy. For those looking for different visas, like the O-A multiple entry visa, this letter is not required.