1. Understanding Vietnam's 10-Digit vs. 13-Digit Tax ID (Mã Số Thuế) Structure
Under Vietnam's enterprise and tax registration system, a company's business registration number also serves as its 10-digit Tax Identification Number (Mã số thuế — MST). Every legally incorporated parent company in Vietnam receives a unique 10-digit code printed on its Enterprise Registration Certificate (Giấy chứng nhận đăng ký doanh nghiệp — ERC).
When a Vietnamese company registers a dependent regional branch, warehouse, or provincial manufacturing plant, local authorities issue a 13-digit branch code created by adding a 3-digit hyphenated suffix (such as -001 or -002) to the parent company's 10-digit MST. For example, a manufacturer headquartered in Ho Chi Minh City or Hanoi will hold a 10-digit parent code, while its physical production plant in Bình Dương, Đồng Nai, or Lâm Đồng will carry a matching -001 branch registration. If a supplier claims to own a provincial factory whose gate signage or business license does not link back to its 10-digit parent Tax ID, the facility likely belongs to an undisclosed third party.
2. Checking Active Tax Standing & VSIC Industry Codes
Before countersigning a Proforma Invoice, buyers should check the supplier's 10-digit MST on Vietnam's National Business Registration Portal (dangkykinhdoanh.gov.vn) and the General Department of Taxation lookup portal (tracuunnt.gdt.gov.vn). The company's operating status must confirm that it is actively operating (Đang hoạt động).
If the tax portal indicates that the company has suspended operations (Ngừng hoạt động), is not operating at its registered address, or is under tax invoice enforcement, no deposit should be sent because the firm cannot issue valid VAT e-invoices or clear export customs. At the same time, review the supplier's 4-digit Vietnam Standard Industrial Classification (VSIC) business lines: genuine producers hold manufacturing codes in Divisions 10–33 (food processing, wood products, plastics, textiles, or metal fabrication), whereas companies registered only under Divisions 4610–4690 operate purely as commercial wholesalers or brokers.
3. Confirming the Legal Representative & Historical Export Shipments
A valid commercial contract in Vietnam must be signed by the company's registered Legal Representative (Người đại diện theo pháp luật) named on the ERC, or by an executive holding a formal written Power of Attorney (Giấy ủy quyền). Relying solely on a sales manager's signature without verifying signatory authority can complicate contract enforcement.
Finally, cross-checking 24 to 36 months of Bill of Lading (B/L) and HS code export records tied to the supplier's 10-digit Tax ID confirms whether the manufacturer has an established track record of shipping your specific product category to regulated markets such as the EU, North America, Japan, or Australia.
4. Key Specifications & Summary Table
| Verification Area | Verified Parent Manufacturer | Registered Factory Branch (-001) | Common Broker or Risk Signal |
|---|---|---|---|
| Tax ID (Mã Số Thuế) | 10-Digit Parent Company Code | 13-Digit Branch Code (-001 / -002) | Different company name at the factory gate |
| Tax Portal Status | Active Operating (Đang hoạt động) | Active & linked to parent Tax ID | Suspended or blocked from issuing e-invoices |
| VSIC Business Codes | Divisions 10–33 (Manufacturing) | Registered production or mill site | Only Divisions 4610–4690 (Wholesale trading) |
| Contract Signatory | Named Legal Representative on ERC | Authorized Branch Director with POA | Unsigned quote or unverified sales staff signature |
| Export Track Record | Consistent HS code B/L shipments | Cleared under parent or branch account | No prior export history in the product category |
5. Frequently Asked Questions
Q1. How do I verify if a company in Vietnam is legally registered and active?
Request the supplier's 10-digit Tax ID (Mã số thuế) and Enterprise Registration Certificate (ERC). Check the number on Vietnam's National Business Registration Portal (dangkykinhdoanh.gov.vn) and General Department of Taxation portal (tracuunnt.gdt.gov.vn) to confirm active tax status, verify the Legal Representative's name, and confirm manufacturing industry codes (VSIC Divisions 10–33).
Q2. What is the difference between a 10-digit and 13-digit Tax ID in Vietnam?
A 10-digit Mã số thuế identifies the legally incorporated parent company. A 13-digit code adds a 3-digit suffix (such as -001 or -002) to designate a dependent branch office, warehouse, or provincial factory legally owned by that same parent enterprise.
Q3. Why isn't a PDF scan of a business license enough to verify a supplier?
Static PDF scans can be outdated or edited. Always match the 10-digit Tax ID, registered addresses, and Legal Representative against live government tax portals, confirm corporate digital signature validity on the Proforma Invoice, and verify past export Bills of Lading.