If You Do Not Wish to Change to a Long-Term Visa Type from a Short-Term Visa and You Have No Extenuating Health Concerns – You should make plans to leave Thailand before the September 26 deadline or risk being in violation of Thai immigration law. If you wish you request a letter from the U.S. Embassy to accompany your application for a 30-day extension past the September 26 deadline, please click on this link to complete this form to request a letter. Please note the Royal Thai government is under no obligation to extend short-term visas and may end the practice at any time. If your request is denied or you do not wish to change to an appropriate long-term visa category, you should begin making plans to depart Thailand as soon as possible. Please contact the U.S. Consulate General in Chiang Mai if you need financial assistance to depart Thailand