The Thai retirement visa once approved allows you to stay in Thailand for one year. You are not allowed to have employment while on this type of visa.The Thai retirement visa for US citizens is issued to retirees or applicants who wish to visit and retire in the Kingdom of Thailand. 1. Legalization form. Download Click --> Legalization-Form. In signing this form, I authorize the Social Security Administration to send this payment to the financial institution indicated in Section 3 and deposit it in. Many of these benefits are funded through social security contributions. The second step is to obtain a one-year retirement visa. You must be 50 or older to receive this, and have a Thai bank book and a letter from your Thai bank. Exercise a high degree of caution in Thailand due to ongoing political tensions and sporadic demonstrations in Bangkok and elsewhere in the country.