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Thailand: E-tax filing

Carolina Silva
February 8, 2023

Thailand has permitted e-invoicing since 2012. From 2017 – following regulations issued on e-tax and e-receipts – taxpayers may prepare, deliver, and keep their invoices and receipts electronically, subject to prior approval from the Thai Revenue Department.

Currently, the Revenue Department and the Electronic Transactions Development Agency (ETDA) are working together to improve the e-tax invoicing system in Thailand. As a result of this joint effort, they’re developing new regulations.

Thailand´s voluntary e-invoicing system aims to promote and support their e-payment policies and electronic transactions, reduce the cost and management of the government and private sector and increase confidence and safety according to international standards.

According to the Revenue Code documents that can be voluntarily issued electronically are tax invoices (known as e-tax invoices), credit notes, debit notes and receipts.

What is e-tax in Thailand?

E-tax invoices are electronic tax invoices, including regular invoices and debit and credit notes prepared in a specific electronic format.

Formats may include a Microsoft Word file, a Microsoft Excel file, PDF, PDF/A-3, XML or other forms established by the Revenue Department. Finally, the e-tax invoice must be signed using a digital signature or time stamp before being delivered to the buyer.

Thailand e-tax system

Thailand currently has two e-invoicing systems for taxpayers to adopt voluntarily. These are e-tax invoices and e-receipt RTIR, and e-tax invoices by email.

E-tax invoices and e-receipt

Any taxpayer can voluntarily register for this system without a turnover threshold.

Entrepreneurs can prepare electronic tax invoices and electronic receipts in an XML file or other electronic formats with a digital signature. However, to submit the data to the Revenue Department, the information should only be in an XML file format (Bor Thor. 3-2560). They must also have an electronic certificate provided by a Certification Authority.

In this system, the supplier must submit the e-invoice to the Revenue Department by the 15th day of the subsequent tax month after delivering it to the buyer.

E-tax invoice by email

This system is designed for small entities with an annual turnover of less than THB 30 million. Taxpayers can email the invoice to the buyer and include the central system of the agency that develops electronic transactions in the CC field for time stamping.

The system then sends both trading parties an e-tax invoice with a time stamp. In this system, the file format is PDF/A-3. Information is automatically sent to the Revenue Department.

It’s important to note that once approved by the Thai Revenue Department to issue electronic invoices, taxpayers must comply with all the regulations and rules for preparing and storing electronic invoices and receipts.

New regulations on e-tax invoices and e-receipts in Thailand

The Thai Revenue Department has recently published new announcements from the Director-General of the Revenue Department regarding VAT, namely: no. 48, 247, 248 and 249.

E-tax invoices and credit and debit notes should include specific statements from those announcements. As of January 2023, they must specify that electronic invoices were prepared and sent to the Revenue Department electronically.

The Thai Revenue Department also set forward new standards in the Announcement of the Director-General of the Revenue Department No.48 regarding forms, method of delivery, storage and documentary evidence or books and information security for operations relating to electronic invoicing.

These new standards entered into force on 19 August 2022.

This regulation reinforces the need for prior approval and permission from the Revenue Department to connect with the electronic systems to issue e-tax invoices. It is subject to the requirement that a data security system can ensure the fulfilment of e-tax invoices and e-receipts.

The taxpayers opting for e-invoicing must follow the rules and conditions for this process. They need to inform the Revenue Department of the e-tax invoice by submitting a receipt for the tax invoice and the certificate used for digital signature.

E-archive rules in Thailand

The Thai Revenue Department also issued new standards in Announcement No. 48 for storing and archiving e-tax invoices and e-receipts.

Taxpayers who are obligated to issue an invoice and choose to do so electronically have to keep the electronic invoice or receipt according to specific criteria:

(a) Use reliable methods to maintain message integrity from the time the message is completed and can display that message later.

(b) Keep information on tax invoices or receipts, which can be accessed and reused, and the meaning does not change.

(c) Keep the information of tax invoices or receipts in the format in which they were created, sent, or received – or in a form that can display messages correctly, and

(d) Retain information indicating the origin and destination of the tax invoice or receipt and the date and time they sent the message.

According to the Thai Revenue Code, electronic invoices must be stored electronically for no less than five years but no more than seven years. Taxpayers must keep tax audit e-invoices until the completion of the audit.

What´s next in Thailand?                   

These were significant steps towards the digitalisation of taxation in Thailand. Although there is no future timeline or mandate, they’ve taken more measures to solidify and mature the e-invoicing mandate.

While e-invoicing is still not mandatory in Thailand, the government intends to promote e-tax invoices to help businesses to increase efficiency and decrease costs. These measures could be applicable in a future compulsory e-invoicing mandate.

If you want to learn more about e-tax in Thailand or have any other question please feel free to get in touch with a tax expert today.

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Carolina Silva

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