Skip to main content

Vietnam MST number guide

Mã số thuế – MST

The “Mã số thuế (MST)” is a tax identification number issued to entities (including companies, partnerships and subsidiaries) of relevance and to individuals for tax administration. An organisation or an individual can apply for MST number online by accessing the website of General Department of Taxation.

Format of the MST number

MST number either has 10 digits or 13 digits. Parent organisations and individuals have a 10 digit MST number. Subsidiaries have 13 digit MST number where the first 10 digits are the same as the parent organisation of this subsidiary.


10 digit number — 0314409058

13 digit number — 0314409058-002

Breaking down the MST number

03 — The first 2 digits of the MST number represent the province code where the business is established. If the business relocates to a different location in the future, the MST number remains unchanged.

1440905 — The next 7 digits can be any random number from 0000001 to 9999999.

8 — The 10th digit is the checksum that is calculated on the basis of the first 9 digits.

002 — The last 3 digits (in the 13 digit MST number) are optional and are used only for subsidiaries. They can be any random number from 001 to 999.

How Lookuptax can help you ?

Lookuptax Tax ID validation revolutionizes Tax ID number validation with its robust platform, empowering businesses to seamlessly verify Tax ID numbers across over 100 countries. Our cutting-edge technology ensures accurate and efficient validation, reducing errors and enhancing compliance.