Introduction: Why E-Invoice Compliance Matters for Your Vietnam Business
If your company operates in Vietnam, you’ve likely heard about the government’s mandatory transition to electronic invoices (hóa đơn điện tử). What began as a phased rollout under Decree No. 123/2020/NĐ-CP has now become a non-negotiable compliance requirement for virtually every enterprise in the country — and foreign-invested enterprises (FDI companies) are no exception.
Since July 1, 2022, all businesses, organizations, and household businesses in Vietnam have been required to use e-invoices authenticated by the tax authority. This represents one of the most significant regulatory shifts in Vietnam’s accounting landscape in recent years, and non-compliance carries real consequences: rejected input VAT credits, administrative fines up to VND 30 million, and potential tax audit triggers.
For FDI companies — whether you’re a manufacturing operation in Binh Duong, a trading company in Ho Chi Minh City, or a service provider in Hanoi — understanding e-invoice regulations is not optional. It’s a core part of your accounting compliance framework in Vietnam. This guide covers everything you need to know: the legal basis, types of e-invoices, registration procedures, deadlines, common pitfalls, and how professional accounting services can help you navigate the transition smoothly.
Legal Framework: Decree 123/2020/NĐ-CP and Circular 78/2021/TT-BTC
The e-invoice mandate in Vietnam is governed by two principal legal instruments:
- Decree No. 123/2020/NĐ-CP (October 19, 2020): Regulates invoices and documents for the sale of goods and provision of services. This decree formally establishes the legal framework for e-invoices and sets the mandatory compliance timeline. View on VBPL
- Circular No. 78/2021/TT-BTC (September 17, 2021): Provides detailed implementation guidance for Decree 123, including e-invoice formats, registration procedures, data transmission protocols, and handling of erroneous invoices. Ministry of Finance Portal
Additionally, Decision No. 1450/QĐ-TCT (October 7, 2021) issued by the General Department of Taxation (GDT) regulates the technical standards for e-invoice data format, XML schema specifications, and the operation of the national e-invoice system. Together, these three documents form the backbone of Vietnam’s e-invoice ecosystem.
Key Dates Every FDI Company Should Know
| Date | Milestone |
|---|---|
| October 19, 2020 | Decree 123/2020/NĐ-CP promulgated |
| July 1, 2022 | Mandatory e-invoice adoption for all enterprises nationwide |
| July 1, 2022 – June 30, 2023 | Transition period for businesses not yet registered (with limitations) |
| July 1, 2023 | Full enforcement; paper invoices no longer valid except specific cases |
Note: As of 2026, all businesses in Vietnam must use e-invoices. The transition window closed on June 30, 2023. If your company is still issuing paper invoices, you are operating outside the law.
Two Types of E-Invoices: With and Without Tax Authority Code
Vietnam’s e-invoice system categorizes invoices into two distinct types. Understanding the difference is critical because your choice affects your operational workflow, VAT deduction timing, and tax authority interaction.
1. E-Invoice with Tax Authority Code (Có Mã Của Cơ Quan Thuế)
This is the standard e-invoice type required for most businesses. Here’s how it works:
- When you issue an invoice, your e-invoice software sends the invoice data to the GDT’s system in real-time.
- The GDT validates the data and returns a unique verification code — a cryptographic string that authenticates the invoice.
- Only after receiving this code is the invoice considered legally valid.
- The buyer can verify the invoice’s authenticity on the GDT portal using the code.
Who must use this type: All enterprises, except those explicitly permitted to use non-coded e-invoices (see below). This includes all FDI companies engaged in manufacturing, trading, services, and most other commercial activities.
2. E-Invoice Without Tax Authority Code (Không Có Mã)
Certain enterprises may use e-invoices without the tax authority code, provided they meet specific conditions:
- Enterprises in sectors deemed high-risk for tax evasion by the tax authority (e.g., trading in petroleum products, telecommunications, insurance, banking, securities) may be required to use coded e-invoices regardless of their size or systems.
- Enterprises that have invested in advanced IT infrastructure and accounting systems that meet GDT technical standards may apply for permission to use non-coded e-invoices.
- Even with non-coded invoices, the enterprise must transmit invoice summary data to the GDT on a periodic basis (monthly or quarterly).
Practical advice for FDI companies: Unless you have received explicit written approval from your managing tax office to use non-coded e-invoices, assume you need to use coded e-invoices. Most small and medium-sized FDI enterprises fall squarely in the coded category. Our accounting team at Á Châu regularly assists foreign clients in determining the correct e-invoice type for their specific business activities.
| Feature | Coded E-Invoice | Non-Coded E-Invoice |
|---|---|---|
| GDT verification code | Required | Not required |
| Real-time data transmission | Yes, per invoice | Periodic (monthly/quarterly) |
| Apply to most enterprises | Yes (default) | No (requires approval) |
| VAT deduction timing | Upon receiving GDT code | Upon invoice issuance |
| Buyer verification portal | Available | Not directly available |
E-Invoice Registration: Step-by-Step for FDI Companies
Registering for e-invoice issuance is not automatic — your company must actively complete the registration process with the tax authority. Here’s the end-to-end workflow:
Step 1: Choose an E-Invoice Solution Provider
You cannot connect directly to the GDT system. You must work through an authorized e-invoice service provider (tổ chức cung cấp dịch vụ hóa đơn điện tử). Major providers in Vietnam include Viettel, VNPT, MISA, BKAV, and FPT. When selecting a provider, consider:
- Integration capability with your existing ERP or accounting software
- Support for English-language interfaces (important for FDI management teams)
- Multi-currency capability if you issue invoices in foreign currencies
- Data storage compliance with Vietnamese regulations (10-year retention requirement)
- Pricing model (per-invoice vs. subscription)
Step 2: Prepare Registration Dossier
Submit Form No. 01/ĐKTĐ-HĐĐT (Appendix issued with Decree 123) to your managing tax office. The form requires:
- Enterprise information (tax code, business registration number)
- Selected e-invoice type (coded or non-coded, with justification if non-coded)
- E-invoice service provider information
- Digital signature certificate details
- Bank account information for electronic tax payment
Step 3: Obtain Digital Signature
Every e-invoice must be digitally signed by the seller. Your company must obtain a valid digital signature certificate from a licensed certification authority (CA) in Vietnam, such as VNPT-CA, Viettel-CA, or FPT-CA. The digital signature must be:
- Issued to the legal representative or authorized signatory of the enterprise
- Registered with the tax authority
- Valid and not expired at the time of invoice issuance
- Compatible with the e-invoice provider’s platform
Step 4: Await Tax Authority Approval
After submission, the tax office reviews your registration. If approved, you will receive a notification and can begin issuing e-invoices. The tax authority may reject the application if:
- Information is incomplete or inconsistent
- The enterprise has outstanding tax liabilities or unresolved tax audit issues
- The selected e-invoice type does not match the enterprise’s tax risk profile
Step 5: Begin Issuing E-Invoices
Once approved, you can begin issuing e-invoices through your provider’s platform. The system will automatically transmit each invoice to the GDT for code issuance (if coded type) and store the data for future reference.
E-Invoice Data Format: What Must Be Included
Under Circular 78, every e-invoice must contain mandatory fields in a standardized XML format. Missing or incorrect fields can lead to rejected invoices and rejected VAT credits for your customers. Here are the critical fields:
| Field | Description | Requirement |
|---|---|---|
| Invoice number | Unique sequential number | Mandatory |
| Invoice date | Date of issuance (dd/mm/yyyy) | Mandatory |
| Seller information | Name, tax code, address | Mandatory |
| Buyer information | Name, tax code (if business), address | Mandatory for VAT deduction |
| Goods/services description | Name, unit, quantity, unit price | Mandatory |
| VAT rate & amount | Applicable rate (0%, 5%, 8%, 10%) | Mandatory |
| Total amount | Pre-tax + VAT = total payment | Mandatory |
| Currency | VND (or foreign currency with VND conversion) | Mandatory |
| Digital signature | Seller’s valid digital signature | Mandatory |
| GDT verification code | For coded invoices only | Conditional |
Special note for FDI companies: If your invoice is in a foreign currency, the total payment must also be shown in VND at the exchange rate on the invoice date. The tax authority requires this for VAT declaration and CIT calculation purposes.
Common E-Invoice Scenarios: Corrections, Cancellations, and Adjustments
Handling Erroneous Invoices
Mistakes happen. When you issue an e-invoice with errors, you cannot simply delete it. Circular 78 specifies three scenarios:
1. Invoice not yet sent to buyer: Cancel the invoice through your e-invoice system before transmission. The invoice number may be reused.
2. Invoice sent to buyer but buyer has not yet used it: Both parties must agree to cancel. The seller issues a cancellation notice via the e-invoice system, and the invoice is marked as cancelled.
3. Invoice already used by the buyer (e.g., VAT declared): The seller must issue an adjusted invoice or a replacement invoice, not a cancellation. Both the original and adjusted invoices remain in the system for audit trail purposes.
Handling Goods Returns
When goods are returned, the seller issues a credit note (adjustment invoice) reducing the original invoice value. Both parties must adjust their VAT declarations accordingly. This is a critical area where FDI companies often make mistakes — incorrect handling can trigger a tax audit focusing on your entire transaction history.
Penalties for E-Invoice Non-Compliance
Vietnam’s tax authorities take e-invoice violations seriously. Under Decree No. 125/2020/NĐ-CP on administrative penalties for tax violations, the consequences include:
| Violation | Penalty Range (VND) |
|---|---|
| Late registration for e-invoice use (1–30 days) | 2,000,000 – 4,000,000 |
| Late registration for e-invoice use (31–90 days) | 4,000,000 – 8,000,000 |
| Late registration for e-invoice use (>90 days) or non-registration | 8,000,000 – 15,000,000 |
| Using paper invoices when e-invoices are mandatory | 10,000,000 – 20,000,000 |
| Issuing invoices without transmitting data to GDT (coded type) | 15,000,000 – 30,000,000 |
| Failing to issue invoices for goods/services sold | 20,000,000 – 30,000,000 |
Beyond monetary fines, non-compliance can lead to:
- VAT input credit rejection — if your supplier’s invoice is non-compliant, your VAT deduction is denied
- Tax audit triggers — the GDT’s risk-scoring system flags enterprises with e-invoice irregularities
- Reputational damage — business partners may lose confidence in your compliance standards
E-Invoice Data Retention: The 10-Year Rule
Under Vietnamese law, all e-invoice data must be retained for a minimum of 10 years. This includes:
- Original invoice XML files with digital signatures
- PDF/A representation copies (if generated)
- Invoice issuance logs and transmission records
- Adjustment and cancellation records
Your e-invoice provider typically stores this data, but you should maintain your own backup. If you change providers, ensure a complete data migration. If you dissolve the company, invoice data must still be preserved for the full 10-year period. Many FDI companies include this requirement in their corporate governance framework to ensure seamless compliance across management transitions.
Integration with Accounting Systems: The FDI Challenge
For FDI companies using global ERP systems like SAP, Oracle, or Microsoft Dynamics, integrating with Vietnam’s e-invoice system presents unique challenges:
- Data mapping: Vietnam’s mandatory XML schema may not align with your ERP’s native invoice format
- Language: Vietnamese-language invoice descriptions are required for local tax compliance, but your global system may operate in English or another language
- Real-time processing: Coded e-invoices require synchronous communication with the GDT — your ERP must wait for the verification code before finalizing the invoice
- Multi-entity complexity: If you operate multiple legal entities in Vietnam, each requires separate e-invoice registration and configuration
Professional accounting and tax advisory services can bridge this gap by managing the e-invoice workflow independently or by building middleware that connects your ERP to Vietnam’s e-invoice infrastructure.
FAQ: E-Invoice Compliance in Vietnam
1. Can FDI companies issue e-invoices in a foreign currency?
Yes, e-invoices may be issued in a foreign currency if the transaction is legally conducted in that currency. However, the total payment amount must also be shown in VND (converted at the transaction-date exchange rate). Both the foreign currency amount and the VND equivalent must appear on the invoice.
2. What happens if our e-invoice system goes offline?
If your e-invoice system or internet connection fails, Circular 78 allows a grace period. You must issue the invoice within the same day once the system is restored. If the outage extends beyond the day, contact your tax office for guidance. Some providers offer offline issuance with batch transmission once connectivity resumes.
3. Do we need separate e-invoice registration for each branch or factory?
It depends on your tax registration structure. If a branch or factory has its own tax code and files separate VAT returns, it must register for e-invoices independently. If it operates under the head office’s tax code, the head office’s e-invoice registration covers all locations. Consult your accounting advisor to confirm your specific setup.
4. Can the buyer verify the authenticity of an e-invoice?
Yes. For coded e-invoices, the buyer can visit the GDT’s e-invoice lookup portal at hoadondientu.gdt.gov.vn and enter the invoice number and verification code to confirm authenticity. For non-coded invoices, this portal is not available, and the buyer must rely on the seller’s digital signature and the periodic data transmitted to the GDT.
5. Is e-invoice compliance mandatory for representative offices of foreign companies?
Representative offices in Vietnam are generally prohibited from conducting revenue-generating activities and therefore do not issue invoices. However, if a representative office engages in any taxable activity (even inadvertently), it must register for e-invoice use. This is a common compliance trap — even a small service fee for internal cost allocation can trigger the requirement.
Conclusion: Get Compliant, Stay Compliant
E-invoice compliance in Vietnam is no longer a “nice to have” — it’s a legal requirement that affects every transaction your company conducts. For FDI enterprises, the stakes are particularly high: non-compliance can disrupt your supply chain, invalidate your VAT deductions, and put your entire Vietnam operation under the tax authority’s microscope.
The good news is that with proper planning and the right support, e-invoice compliance can be straightforward. Whether you need help selecting an e-invoice provider, integrating with your global ERP, or managing ongoing compliance, Á Châu Accounting offers end-to-end solutions tailored for foreign enterprises. Our bilingual team understands both Vietnamese regulations and international business requirements, ensuring your accounting operations in Vietnam remain audit-ready at all times.
Contact Á Châu today for a free consultation on your e-invoice compliance status. Visit taichinhachau.com or explore business networking opportunities at bizca.vn — Vietnam’s hub for FDI enterprises and service providers.
