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Clarify USCC entity categories and validation limits #515

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Clarify USCC entity categories and validation limits #515

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24 changes: 15 additions & 9 deletions stdnum/cn/uscc.py
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Original file line number Diff line number Diff line change
Expand Up @@ -30,15 +30,18 @@
The registering authority digit most often is a 9, which represents the State
Administration for Industry and Commerce (SAIC) as the registering authority.

The registered entity type indicates the type of business (or entity). The
most common entity types in China are:
The registered entity type must be interpreted together with the registering
authority. Under authority 9 (market regulation), the second digit identifies
these categories:

* Wholly Foreign-Owned Enterprises (WFOE): 外商独资企业
* Joint Ventures (JV): 合资
* Representative Office: 代表处
* State-Owned Enterprise (SOE): 国有企业
* Private Enterprise: 民营企业
* Individually-Owned: 个体户
* 1: Enterprise (企业)
* 2: Individually-owned business (个体工商户)
* 3: Farmers' specialised cooperative (农民专业合作社)

These categories do not distinguish foreign, state or private ownership.
The prefix also need not reflect the current entity type: under Article 10
of SAMR Order No. 112, an individually-owned business that converts to an
enterprise through a change of registration retains its code.

The registering region code, sometimes referred to as the "administrative
division code", is a string of six numbers that indicates where the company
Expand All @@ -51,6 +54,8 @@

More information:

* https://scjgj.beijing.gov.cn/zwxx/scjgdt/202407/t20240719_3753300.html
* https://www.samr.gov.cn/zw/zfxxgk/fdzdgknr/fgs/art/2025/art_70644edcbd6349a09dbe2e32e725705d.html
* https://zh.wikipedia.org/wiki/统一社会信用代码
* https://zh.wikipedia.org/wiki/校验码
* https://www.oecd.org/tax/automatic-exchange/crs-implementation-and-assistance/tax-identification-numbers/China-TIN.pdf
Expand Down Expand Up @@ -98,7 +103,8 @@ def calc_check_digit(number: str) -> str:
def validate(number: str) -> str:
"""Check if the number is a valid USCC.

This checks the length, formatting and check digit.
This checks the length, formatting and check digit. It does not check
whether the number was issued or whether the entity is currently registered.
"""
number = compact(number)
if len(number) != 18:
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