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Country guide

Taiwan, Province of China

Taiwan uses the National ID Card Number for nationals with household registration, UI Numbers for individuals without a National ID who receive a UI Number, self-produced Tax Codes for certain individuals without either identifier, and the 8-digit Business Administration Number for non-individuals.

TW TWN 6 TIN types Last reviewed 2026-06-05

TIN types

6 published formats. Open a type to see examples, structure details, and official sources.

Validate TWN TIN
Taiwan National ID Number
Current Individuals

Department of Household Registration, Ministry of the Interior (內政部戶政司)

Primary TIN for nationals who have or have had household registration in Taiwan.

Details
Examples
A123456789 B223456782
Where to find it

On the R.O.C. national ID card, household certificate, and passport.

Common names
National ID Card Number ID No. 國民身分證統一編號 身分證字號
Structure
1 Area code Letter representing the municipality, county, or city of household registration.
2 Gender code 1 for male and 2 for female.
3-9 Serial Seven numeric characters.
10 Check digit Control digit.
Official source
mof.gov.tw ris.gov.tw schema.gov.tw
Taiwan UI Number (new format)
Current Individuals

National Immigration Agency, Ministry of the Interior (內政部移民署)

Current UI Number format issued from January 2, 2021 to people who do not have a National ID Card Number and receive a UI Number.

Details
Examples
A800000014 B900000017
Where to find it

On the R.O.C. (Taiwan) Resident Certificate, Exit & Entry Permit Taiwan Republic of China, or R.O.C. (Taiwan) UI No. Basic Information Form.

Common names
UI Number 外來人口統一證號 統一證號
Structure
1 Area code Letter representing the place of application.
2 Gender code 8 for male and 9 for female.
3-9 Serial Seven numeric characters.
10 Check digit Control digit.
Official source
mof.gov.tw immigration.gov.tw schema.gov.tw
Taiwan UI Number (legacy two-letter format)
Transitional Individuals

National Immigration Agency, Ministry of the Interior (內政部移民署)

Legacy UI Number format issued on or before January 1, 2021 to people without a National ID Card Number.

Details
Examples
AC12345679 BD12345672
Where to find it

On older resident certificates, entry and exit permits, or UI Number records issued before the 2021 format change.

Common names
UI Number Resident Certificate Number ARC number 外來人口統一證號 統一證號
Structure
1 Area code Letter representing the issuing municipality, county, or city.
2 Gender letter A or C for male, and B or D for female.
3-9 Serial Seven numeric characters.
10 Check digit Control digit.
Official source
mof.gov.tw immigration.gov.tw ntbt.gov.tw schema.gov.tw
Taiwan Tax Code (Mainland China area individuals)
Current Individuals

Self-produced under Ministry of Finance (財政部) coding principle

Self-produced Tax Code for individuals of Mainland China area who have neither a National ID Card Number nor a UI Number.

Details
Examples
9800101 9991231
Where to find it

Not shown on a standard identity card; it is produced from the official coding principle when needed as the person's TIN.

Common names
Tax Code 稅籍編號 稅務識別碼
Structure
1 Fixed prefix Fixed digit 9.
2-3 Birth year Last two digits of the year of birth.
4-7 Birth month and day Month and day of birth in MMDD form.
Official source
mof.gov.tw
Taiwan Tax Code (other individuals without ID or UI Number)
Current Individuals

Self-produced under Ministry of Finance (財政部) coding principle

Self-produced Tax Code for individuals other than Mainland China area individuals who have neither a National ID Card Number nor a UI Number.

Details
Examples
19800101AB 20000229LI
Where to find it

Not shown on a standard identity card; it is produced from the official coding principle when needed as the person's TIN.

Common names
Tax Code 稅籍編號 稅務識別碼
Structure
1-8 Birth date Date of birth in YYYYMMDD form.
9-10 Name letters First two alphabetic letters of the name shown on the passport.
Official source
mof.gov.tw
Taiwan Unified Business Number (UBN)
Current Entities

Business registration authorities / Ministry of Finance tax authorities (公司、商業登記主管機關／財政部稅捐稽徵機關)

Eight-digit TIN for non-individuals, including businesses, organizations, and withholding units that receive a business administration number.

Details
Examples
04595257 10000004
Where to find it

On the company registration certificate or business registration certificate; for non-profit organizations, on the BAN-issuance notification.

Common names
UBN BAN Business Administration Number Unified Business Number 統一編號 營利事業統一編號
Structure
1-7 Body Seven numeric characters assigned by the registration or tax authority.
8 Check digit Control digit used by the checksum rule.
Official source
mof.gov.tw fia.gov.tw serv.gcis.nat.gov.tw data.gov.tw