Any person or entity who is liable to VAT in Thailand must register to be VAT registered person or entity (Form VAT 01) before the operation of business or within 30 days after its income reaches the threshold. The registration application must be submitted to Area Revenue Offices if the business is situated in Bangkok or to the Area Revenue Branch Offices if it is situated elsewhere. Should taxpayer have several branches, registration application must be submitted to the Revenue Office where the headquarter is situated.