Scope of the e-Invoicing system
The Thai Revenue Department (RD) introduced the Electronic Tax Invoice (e-Tax Invoice) and Electronic Receipt (e-Receipt) framework in 2017. Participation in the e-Tax Invoice system remains voluntary, allowing eligible VAT-registered businesses to digitize their invoicing processes.
The regulation covers electronic:
- Tax Invoices
- Receipts
- Credit Notes
- Debit Notes
Both Business-to-Business (B2B) and Business-to-Consumer (B2C) transactions are supported under the framework.
Technical details of the e-Invoice system
Electronic tax invoices may be generated in XML or other electronic formats accepted by the Thai Revenue Department, including PDF/A-3 where applicable.
Electronic documents must be digitally signed and time stamped before submission.
To digitally sign electronic documents, suppliers must obtain a valid electronic certificate issued by an approved Certification Authority (CA).
Submission Methods
1. The e-Tax and e-Receipt System
The Thai Revenue Department provides multiple submission methods:
- Web Upload (manual submission through the RD portal)
- Host-to-Host integration for ERP systems
- Certified Service Providers approved by the Revenue Department (RD) and the Electronic Transactions Development Agency (ETDA)
Host-to-Host integration is generally preferred by organizations processing high invoice volumes or requiring automated ERP integration.
2. e-Tax Invoice by Email
VAT-registered businesses whose annual revenue does not exceed THB 30 million may issue e-Tax Invoices and e-Receipts in PDF/A-3 format and submit them through the e-Tax Invoice by Email framework.
Electronic documents must be reported in accordance with the reporting schedule established by the Thai Revenue Department.
How can SNI help you?
SNI provides an end-to-end Thailand e-Invoicing solution that enables businesses to comply with the requirements established by the Thai Revenue Department (RD).
Our solution supports the complete invoice lifecycle, including invoice creation, data extraction, mapping, XML generation where applicable, digital signing, validation, transmission, monitoring, reconciliation, and long-term archiving.
SNI automatically extracts invoice data from ERP systems and generates electronic tax invoices in accordance with the latest Thai Revenue Department technical specifications.
For outbound invoices, SNI securely submits electronic documents through the selected communication channel, including Host-to-Host integration, certified service providers, or other approved submission methods supported by the Thai Revenue Department.
For inbound invoice processing, SNI supports the automated retrieval and processing of structured invoice data, enabling seamless integration with ERP systems and downstream financial processes.
All inbound invoices are displayed in SNI’s Inbound Cockpit, providing centralized monitoring, invoice status tracking, structured invoice visualization, and human-readable HTML/PDF rendering.
SNI’s invoice reconciliation functionality automatically matches incoming invoices with purchase orders, delivery notes, or other ERP documents, reducing manual effort while improving processing accuracy and accelerating invoice approval workflows.
SNI solution integrates with clients’ systems without requiring ERP upgrades and supports SAP ECC 4.7 and higher, SAP ERP, SAP S/4HANA, and SAP Business Technology Platform (SAP BTP) while remaining ERP-independent.
With continuous monitoring of regulatory developments published by the Thai Revenue Department (RD), SNI enables organizations to maintain long-term compliance while minimizing implementation effort and operational risk.