South Korea BRN Validation
Validate South Korea Business Registration Number (BRN) Online
Quickly and accurately validate South Korea Business Registration Numbers (사업자등록번호) issued by the National Tax Service (NTS) for all registered businesses.
Understanding South Korea BRN (사업자등록번호) Format
The Business Registration Number (사업자등록번호) is a 10-digit code formatted as XXX-XX-XXXXX, issued by the National Tax Service (NTS) of South Korea to all registered businesses.
Office Code
Type
Check
- ✓ Regional Code: The first 3 digits identify the regional NTS tax office where the business registered.
- ✓ Business Type: Digits 4–5 indicate the business type (e.g., corporate, individual, non-profit) as classified by the NTS.
- ✓ Serial & Check: The final 5 digits include a sequential business identifier, with the last digit being a check digit computed using the NTS weighted algorithm to verify authenticity of the BRN.
Frequently Asked Questions
What is a South Korea BRN (사업자등록번호)?
The Business Registration Number (사업자등록번호) is a unique 10-digit tax identifier issued by South Korea's National Tax Service (NTS) to all registered businesses, including corporations, sole traders, and partnerships. It is the primary identifier for tax and commercial purposes in South Korea. Validate any Korean BRN instantly with Lookuptax — sign up free.
Is BRN validation mandatory for cross-border payments?
Yes. When making B2B payments to Korean entities or receiving payments from them, validating the BRN is critical for withholding tax compliance and e-tax invoice (세금계산서) accuracy. Invalid BRNs result in rejected e-invoices under Korea's National Tax Service system. Use the Lookuptax API to automate this check — sign up free.
What data is returned when I validate a BRN?
A successful BRN validation via Lookuptax returns the registered company name, NTS registration status (active/closed/suspended), business type classification, and the regional tax office details. This data streamlines KYC, supplier onboarding, and invoice reconciliation workflows. Sign up free to explore the full response.
Can I integrate BRN validation into my billing system?
Absolutely. Lookuptax provides a REST API that lets you embed real-time Korean BRN validation directly into your ERP, billing platform, or KYC workflow. Support for 100+ countries is included in a single integration. Sign up free and start validating today.
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