Thai Revenue Department (RD) introduced e-invoicing regulations in 2017. While there is no obligation to adopt e-invoicing, taxpayers who opt to do so must comply with the regulations.

Taxpayers are required to transmit their e-invoices to RD by the 15th of the following month under the e-invoicing regulation. Invoices transmitted to RD must carry digital signature and certificate, which can be obtained using a specific USB-like hardware from RD.

A three-year deduction incentive was implemented by the Thai Revenue Department in 2019 to encourage the use of e-invoicing, which was further extended to 2025 by Royal Decree No. 766 released in June 2023.  In accordance with Decree 766, a company or juristic partnership is eligible to deduct up to 100% of the following expenses:

• Expense for investment in an electronic system including computer equipment and software for eInvoice and eReceipt; Equipment for storing electronic certificates or other equipment used together with a computer for preparing, delivering, receiving, or maintaining e- tax invoices or e- receipts.
• Fees paid to service provider of eInvoice and eReceipt systems.