Compliance · 🇹🇭 Thailand Voluntary

Thailand — Revenue Department e-Tax invoice

Voluntary e-Tax invoice/e-Receipt · ETDA-aligned XML · no mandate yet — regulator: Revenue Department / ETDA. Facts last refreshed: 2026-05-05.

Coverage model

Flowie operates a registered Peppol Access Point in this jurisdiction directly where we hold national accreditation, or via a vetted local partner registered with the in-country regulator where on-the-ground presence is required (KSeF, SDI intermediario, ZATCA service-provider, etc.). Either way, you call the same POST /v1/documents/send.

TL;DR

Thailand's e-Tax Invoice & e-Receipt regime, run by the Revenue Department with ETDA-aligned standards, is voluntary.
Two paths: full system (digital signature, any taxpayer) and e-Tax Invoice by Email (time stamp only, for small businesses ≤ THB 30 m).
Format: ETDA-compliant XML, digitally signed; storage 5 years.
No turnover threshold for voluntary registration; no firm mandate timetable as of 2026.
If you operate B2B in Thailand at scale, voluntary adoption has tax-administration benefits (faster refunds) and customer experience benefits.

Deadlines

Date	Who	What
2012-01	Voluntary launch	Revenue Department issues regulations for e-Tax Invoice & e-Receipt.
2017-2019	Email path	e-Tax Invoice by Email available for SME (≤ THB 30 m).
No date	Mandate	No firm mandate; voluntary regime continues.

Background

Thailand has had a voluntary e-Tax invoice regime since 2012, operated by the Revenue Department in coordination with the Electronic Transactions Development Agency (ETDA). The full system requires a digital certificate from a Thailand CA, ETDA-compliant XML, and submission to the RD portal. A simplified e-Tax Invoice by Email path uses time-stamp-only authentication and is open to businesses with annual revenue ≤ THB 30 m.

Despite repeated indications that mandatory e-invoicing is on the roadmap, no firm mandate timetable exists as of 2026. The RD continues to encourage adoption — voluntary registrants benefit from accelerated VAT refund processing and integration with ETDA's e-services. Storage of e-Tax invoices is required for 5 years.

Practically, Thailand sits between China-style universal mandates and Singapore-style Peppol leadership: a transitional voluntary model with strong infrastructure but no compulsion.

Format profile

ETDA-compliant XML (national format; not UBL/Peppol).
Seller's 13-digit tax ID mandatory.
Full system: digital signature from a Thai CA; e-Tax by Email: time stamp only.
Storage: 5 years from issuance.

Required fields

seller.taxIdstring (13 digits)required

Thai tax identification number.
seller.digitalCertificatePKCS#12required for full system

Certificate from a Thai CA; required for the full e-Tax invoice path.

Public sector (B2G)

Combined private + public flow — no dedicated B2G hub for this country.

B2B reporting / clearance

No central B2B reporting hub — pure transmission only.

Error codes

Generic Peppol BIS schematron error codes apply (BR-*, EN16931-*); no country-specific overlays.

Testing in sandbox

Generic sandbox patterns apply — see Sandbox guide.

FAQ

Should I voluntarily adopt e-Tax in Thailand?

If you have material Thai B2B volume, yes — VAT refunds are faster and integration with ETDA simplifies downstream tax filings. Flowie's Thailand path issues both the full and email flavours from the same JSON.

References

Primary sources (government / regulator / standards body):

Revenue Department (English) — Thai Revenue Department e-Service overview.
RD · e-Tax Invoice & e-Receipt portal — Production portal.
ETDA · Electronic Transactions Development Agency — Standards body for e-Tax invoice.

Industry analyses (vendor trackers — useful for cross-referencing):

EDICOM · Thailand e-invoicing — Industry tracker — voluntary regime.