Resource · Guide
The Vietnam GDT e-invoice guide for finance teams
Vietnam moved to mandatory electronic invoicing through the General Department of Taxation (GDT). This guide explains how the system works, what finance teams need to validate on every invoice, and how to keep compliance fast.
What the GDT system covers
All businesses issuing invoices in Vietnam must register e-invoice templates with the GDT and transmit issued invoices to the central registry. Buyers can verify any invoice against the registry using its serial and seller MST.
What buyers should validate
- Seller MST is active and matches the supplier on the invoice.
- Invoice serial and template are registered with GDT.
- Issue date is within the supplier's authorised range.
- Invoice total matches the registered amount.
How to validate at scale
Validating every invoice manually doesn't scale once you process more than a few dozen a week. BancoOS calls the GDT registry on every inbound invoice automatically, stores the registry response as audit evidence, and only escalates true exceptions to finance.
Frequently asked questions
- What is AP automation?
- Accounts payable (AP) automation replaces manual data entry, email approval chains and spreadsheet trackers with software that captures, matches, approves and pays invoices automatically — with humans only handling exceptions.
- How does GDT validation work?
- Every electronic invoice issued in Vietnam carries a unique reference registered with the General Department of Taxation. Validation calls the GDT registry with the seller MST, invoice serial and template, and confirms the invoice exists with the expected total — flagging anything that doesn't match.