The US mission in Thailand yesterday issued an announcement that from Jan 1, 2019, the US embassy in Bangkok and the US consulate general in Chiang Mai will no longer provide an income affidavit, and will not notarise previous versions of the income affidavit.
The Thai government requires applicants to meet a minimum income threshold to obtain a non-immigrant long-term stay visa. While the government has previously relied on income affidavits to demonstrate this fact, the US has no mechanism to confirm individual incomes and cannot legally claim to do so.
Because the US has no means of confirming its citizens' incomes, a notarised affidavit from the embassy has never met the requirement to prove a minimum income level for a non-immigrant "O", "O-A" or "O-X" long-term stay visa. There are other methods for US citizens to demonstrate they are eligible for this Thai visa category.
US citizens residing in Thailand should refer to the Thai government for information about verifying their income moving forward.
For the most current information, they should check with the Ministry of Foreign Affairs, the Thai embassy in Washington, DC, or their local immigration office.