Taiwan eGUI Note
MOF eGUI allowance (折讓) credit certificates & invoice void (作廢) messages — MIG 4.0 XML + BYOK upload
Issue Taiwan eGUI allowance certificates (折讓證明單) and void (作廢) messages to the Ministry of Finance e-invoice platform under the MIG 4.0 guideline, the format mandatory from 1 January 2026. Builds on the Taiwan eGUI invoice connector — for Odoo 18 and 19.
Allowance MIG 4.0 XML
Produces the native MOF Allowance message
(Main / Details / AllowanceAmount) for customer credit notes,
with taxable, zero-rated and exempt tax-type mapping and TWD
whole-dollar amount formatting reused from the invoice
connector.
Automatic D0401 / D0501
A business buyer carrying a valid 8-digit BAN produces the
buyer-confirmed B2B allowance D0401; a consumer
buyer produces the seller-issued D0501 —
resolved automatically from the partner.
Original-Invoice Linkage
Every allowance line references the original uniform-invoice number, date and line sequence it reduces — taken from the reversed entry — so the certificate ties back to the cleared invoice exactly as the MOF requires.
Void & Cancellation
Generate void (作廢) messages for both the original invoice
(CancelInvoice, C0501) and an issued allowance
certificate (CancelAllowance), each with a reason
and full party block.
Real BAN Check-Digit
The 8-digit Unified Business Number (統一編號) is validated with the official MOF check-digit algorithm — weighted digit-sum, mod-10, and the documented 7th-digit special case — for the company and every business buyer.
Allowance Proof QR
Builds the allowance verification QR-code payload — allowance number, ROC date, allowance type, hex-encoded reduced sales and tax amounts and the originating invoice number — rendered to PNG.
Validation Rule Set
Layered on the engine EN 16931 core: certificate-number format, seller and buyer BAN checksum, per-line original-invoice reference, positive reduction and message-type, dispatched by the shared validation entry point before submission.
BYOK Upload
Uploads allowance and void messages to a MOF value-added-centre / Turnkey gateway with sandbox/production switching, retries and full transport logging. Official MOF hosts are pre-filled as editable defaults — you bring your own credentials. No keys are bundled.
Workflow
Onboarding wizard → company allowance track & gateway
→ post a customer credit note → Generate / Upload /
Void — all routed through the shared
einvoice.document engine. An optional auto-generate
toggle issues the allowance the moment the credit note is
posted.
Disclosure: this module transmits allowance and void data only to the MOF value-added centre / Turnkey gateway you configure, using your own credentials. No data is sent anywhere else.
Screenshots
Allowance Credit Note Refere
Generated Egui Allowance Cer
Update date: 2026-07-02