Renunciation of U.S. citizenship is a very serious decision, and once approved by the Department of State, is irrevocable. Potential renunciants are asked to carefully reflect on their decision before making an appointment to execute the Oath of Renunciation, which can only be executed at the U.S. Embassy in Bangkok. An individual seeking to renounce their U.S. citizenship must show that they fully understand what he or she is seeking to do, including the consequences such as losing the right to reside in the United States without documentation as an alien as well as show that they are acting of his or her own free will, without undue influence from others and without reservation. We ask that you carefully review the information at the following link http://travel.state.gov/content/travel/english/legal-considerations/us-citizenship-laws-policies.html
After you have clearly understood the relevant information and conditions, you may schedule an appointment by contacting the American Citizens Services unit via Bangkok Contact Form for the U.S. Embassy, Bangkok.
Please be aware the renunciation process requires two separate visits that are at least 48 hours apart. The first visit is to discuss the process with a consular officer and the reason for your desire to renounce your citizenship. The second visit is to complete the formalities, payment and paperwork.
The fee is USD 2,350 is payable in USD or Thai Baht at the time of your second and final appointment. Please see our Schedule of Fees costs, exchange rates, and acceptable forms of payment.