Thank you very much for your reply. "The last 3 months of tax and SSO payments from you." This means I simply can submit the copy of salary slip (which shows the evidence of tax and SSO payment) to the immigration office when applying for extension?
Tod Daniels "The 90 days in-country non-O visa (2000baht)." How this is possible? We can only obtain non-immigrant visa (for the first time) at Thai embassy in other countries and we are supposed to obtain it before entering into Thailand?