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Korea TIN number guide

Resident Registration Number​

The Resident Registration Number (RRN) in South Korea is issued by the Ministry of Interior to Korean citizens residing in the country. This unique identifier plays a pivotal role when a corporation withholds taxes from its employees' wages and salaries or when an individual files tax returns for income, transfer, inheritance, and/or gift.

Resident Registration Card
Resident Registration Card

Additionally, for the purpose of Common Reporting Standard (CRS) reporting, the Passport Number, as issued by the Ministry of Foreign Affairs, is accepted as an alternative TIN.

Koeran Passport
Koeran Passport

Format

The Resident Registration Number, structured as 13 digits (XXXXXX-XXXXXXX), is assigned with specific criteria in mind:

(a) The first six digits are derived from an individual's date of birth. For instance, someone born on January 2, 1985, would have the initial six digits as 850102.

(b) 7th digit serves to identify the gender of individuals.

Business Registration Number​

Issued by the head of a district tax office in the relevant jurisdiction, a Business Registration Number is a crucial identifier for entities starting a business in South Korea. This unique number serves as the Tax Identification Number (TIN) for all tax-related filings, including corporate tax returns.

Format

  • Comprising 10 digits.
  • TIN structure: XXX-XX-XXXXX.
Business Registration Certificate
Business Registration Certificate

Corporation Registration Number​

In the case of a legal entity that has registered its foundation with the court, it receives a Corporation Registration Number managed by the court. Notably, this Corporation Registration Number is also recognized and accepted as the TIN for the entity in specific situations.

Format

  • Consisting of 13 digits.
  • TIN structure: XXXXXX-XXXXXXX.
Certified Copy of the Corporation Registry
Certified Copy of the Corporation Registry

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