The marriage visa is issued “only” to an individual who is currently and legally married to a Thai citizen although this is only the primary requirement since there are other prerequisites that he needs to fulfill.
The visa, which is more formally known as One Year Extension of Stay based on Marriage, allows its holder to stay in Thailand for a year without the need to leave the country every 90 days. It is also renewable within the Kingdom each year so it means there will be no need for him to apply for a renewal abroad.
Furthermore, if the holder wants to work in Thailand, he may do so provided that he has obtained the required work permit.
Apart from the above requirements, the immigration may also ask for other documents that the applicant should also comply.
The applicant cannot file for a marriage visa directly. He must first apply for and be granted with either a 90-day visa or a 1 year Nonimmigrant "O" Visa.
After being granted with the prerequisite visa, he should travel and enter Thailand to activate such visa. Once his visa has been activated, he can then proceed with his application to convert his current visa to a marriage visa.
If there is a need to exit and re-enter Thailand within the validity of his marriage visa, the holder of such visa should apply for and obtain a Re-entry Permit to avoid cancellation of his marriage visa.
He also needs to report his current address to Thai immigration every 90 days.