Vietnamese Tax Code MST (Branch) Generator
Generate and format valid Vietnamese Tax Code MST (Branch) for software testing and development.
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About Vietnamese Tax Code MST (Branch)
The 13-digit Branch Tax Code (Mã Số Thuế Chi Nhánh) is mandated by Vietnam General Department of Taxation (GDT) under Decree No. 123/2020/ND-CP and Circular 105/2020/TT-BTC for dependent business units and branches issuing e-invoices (Hóa đơn điện tử).
The structure combines the 10-digit headquarters base MST (validated via weighted checksum) followed by a hyphen and a 3-digit sequential branch suffix (`001` to `999`), identifying dependent business entities.
Anatomy & Structure of Branch MST (Chi Nhánh) — Vietnam
The Vietnamese Branch Tax ID consists of 13 digits in 2 parts:
| Position | Field | Length | Meaning & Rule | Example |
|---|---|---|---|---|
| 1 to 10 | Parent Company MST | 10 digits | Head office Tax ID with Modulo 11 check digit | 0101234567 |
| 11 to 13 | Branch Suffix | 3 digits | Sequential branch code (001 to 999) | 001 |
Official Branch MST Validation (Circular 105/2020/TT-BTC)
Validation rules for Vietnamese Branch MST:
Parent MST Validation (10 digits Mod 11) + Branch Suffix (001-999)
- 1. Validate the first 10 digits (parent MST) using weighted Modulo 11 algorithm.
- 2. Check that the 3-digit branch suffix is between 001 and 999.