Korea e-Tax Invoice
NTS electronic tax invoicing (전자세금계산서) for Odoo — TaxInvoice XML, PKI signature prep & ASP clearance
Connect Odoo to the Republic of Korea National Tax Service (NTS) e-Tax invoice system — the oldest mandatory clearance model in the world. Customer invoices and credit notes become NTS TaxInvoice XML, are prepared for your accredited-certificate signature, and are cleared through your ASP — which returns the official approval number (승인번호).
NTS TaxInvoice XML
The full NTS TaxInvoice tree — ExchangedDocument, SellerParty / BuyerParty with BRN, representative and business type/class, TaxTotal and per-line trade items — with the correct type codes (0101 tax invoice, 0102 amended, 0201 계산서) and taxation kinds.
PKI signature preparation
The document is canonicalised (W3C C14N), an SHA-256 DigestValue is computed and a fully-formed ds:SignedInfo (RSA-SHA256) is produced — so your bring-your-own accredited certificate signs exactly the bytes the NTS expects.
Real BRN validation
The 10-digit Business Registration Number (사업자등록번호) is validated with the official NTS check-digit algorithm (weights 1·3·7·1·3·7·1·3·5 plus the ninth-digit carry) on company and partner, with taxpayer-class detection.
NTS business-rule validation
A Korea rule set layered on the engine's EN 16931-style core checks supplier/buyer BRNs, line taxation kinds (taxable 10% / zero-rated 영세율 / exempt 면세), KRW currency and the representative before anything is submitted.
Clearance via your ASP
Submit, status polling and cancel/reissue over a configurable accredited ASP REST API — editable base URL and endpoint paths, API-key or bearer auth, automatic retry with exponential backoff and full transport logging. The NTS is reached by the ASP, not by this module.
Bring-your-own-key
Your ASP API key and certificate material live on your own database. They are transmitted only to the accredited ASP endpoint you configure — nowhere else — and certificate signing happens in your own certificate store.
Guided onboarding
A wizard captures your BRN, representative, business type/class and ASP credentials, validates the BRN with the real NTS checksum and leaves the company ready to issue e-Tax invoices. An optional cron drains posted documents to the ASP in batches — the NTS requires reporting by the day after issuance. A verification QR (offline JSON + Hometax link) is rendered for the printed invoice.
Compatible with Odoo 18 and Odoo 19.
Disclosure
This module transmits invoice data only to the accredited ASP endpoint you configure, which relays it to the National Tax Service. Your ASP API key and certificate material are bring-your-own-key, stored solely on your own database and never sent anywhere else.
Screenshots
E Tax Customer Invoice Inv 2
E Tax Document Einv 2026 000
Update date: 2026-07-02