Taiwan Business Tax ID (UBN) Validator

How Taiwan Unified Business Number (UBN) and Business Tax ID verification works

In Taiwan, business entities, corporations, branches, and sole proprietorships are assigned an 8-digit Unified Business Number (UBN, 統一編號, commonly abbreviated BAN) administered by the Ministry of Economic Affairs (MOEA) and the Ministry of Finance (MOF). For international trade, cross-border invoicing, and ERP systems, the identifier is prefixed with TW, for example TW22099131 (TSMC). The number is protected by a statutory weighted modulus checksum formula (Modulo 5 and legacy Modulo 10).

Taiwan is outside the European Union, so a Taiwanese tax number cannot be verified through EU VIES. VIESAC connects directly to the official MOEA GCIS Open Data API to verify company standing and active status (核准設立), cross-references against the daily MOF FIA tax registration dataset (BGMOPEN1), and automatically provides Latin transliteration and English corporate formatting for Chinese company names. Bulk checks, REST API queries, and scheduled monitoring use the same authoritative pipeline.

Questions about Taiwan Business Tax ID (UBN / BAN)

What is a Taiwan Unified Business Number (UBN) and what is its format?

A Taiwan Unified Business Number (UBN, 統一編號, or BAN) is an 8-digit numerical identifier assigned to corporations and businesses in Taiwan. In international invoices and cross-border transactions it is written with the prefix TW, for example TW 2209 9131. It uses an official weighted modulus check digit formula.

What is the difference between MOEA GCIS and MOF FIA in Taiwan?

The Ministry of Economic Affairs (MOEA) GCIS maintains corporate and business registrations, while the Ministry of Finance (MOF) Fiscal Information Agency (FIA) administers business tax registrations. VIESAC queries MOEA GCIS live and uses the daily MOF active tax dataset as a snapshot fallback.

Are Taiwanese company names translated to English on certificates?

Yes. While the official registers in Taiwan record names in Traditional Chinese (e.g. 台灣積體電路製造股份有限公司), VIESAC automatically translates and transliterates corporate names into clear Latin text with standard corporate designations (e.g. Taiwan Semiconductor Manufacturing Co., Ltd.) while preserving the original characters in the audit trail.

Can I verify a Taiwan business tax number in EU VIES?

No. EU VIES only covers EU member states. Taiwanese business numbers are verified against official Taiwanese governmental registries (MOEA GCIS / MOF). VIESAC runs that verification and generates a tamper-evident audit PDF certificate.

Does VIESAC support automated and bulk verification for Taiwan?

Yes. You can upload Taiwanese counterparties via CSV bulk audit, integrate via REST API (/api/v1/validate and /api/v1/audit), or monitor Taiwanese vendors for changes in corporate status.