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Public Other countries Author: Ljubica Blagojević
An e–Tax Invoice is a digital tax invoice that replaces paper documents, regulated by Ministerial Regulation No. 384, the Electronic Transactions Act, and ICT Standard Recommendation No. 3-2560. Thailand offers two types: e–Tax Invoice & e–Receipt for all businesses, requiring a Digital Signature and Electronic Certificate, and e–Tax Invoice by Email for small businesses (≤ THB 30 million), verified through an ETDA Time Stamp. Both support PDF/A-3 or XML formats and may be submitted via approved channels. Verification ensures authenticity, and use of e–Tax Invoices is voluntary, with paper invoices still permitted.
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General information

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Content accuracy validation date: 24.11.2025
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Legal Framework

The e–Tax Invoice system is governed by:

  • Ministerial Regulation No. 384 (B.E. 2565) – rules for preparing documentary evidence electronically.
  • Electronic Transactions Act B.E. 2544 (and Amendments No. 2–4).
  • ICT Standard Recommendation No. 3-2560 – standards for electronic messages in trade.

Types of e–Tax Invoices

Thailand recognizes two main types:

  1. e–Tax Invoice & e–Receipt
  • Available to businesses of all sizes.
  • Formats: PDF, PDF/A-3, XML.
  • Must include a Digital Signature and Electronic Certificate (CA).
  • Submission methods:
    • Web Upload via etax.rd.go.th
    • Host-to-Host (for > 500,000 documents/month, using ebXML; approval required)
    • Authorized Service Provider
  1. e–Tax Invoice by Email (Time Stamp System)
  • Designed for small businesses with annual revenue ≤ THB 30 million.
  • Formats: PDF/A-3 or XML.
  • Verified using a Time Stamp from ETDA.
  • Data is automatically sent to the Revenue Department.

Verification & Authentication

To ensure legal validity, two technologies are used:

  • Electronic Certificate (CA): Confirms the identity of the issuing business.
  • Digital Signature: Ensures document authenticity and integrity, similar to a handwritten signature.

Use of e–Tax Invoices in Thailand is currently voluntary.
Businesses may adopt electronic invoicing partially or fully and may still use paper invoices in parallel.

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