A FinCEN identifier is a unique identifying number (12-digits) issued by FinCEN, upon request, after the individual or company applicant provides certain personal information to FinCEN. This information includes name, date of birth, address, and unique identifying number from an acceptable form of identification.
The FinCEN identifier replaces the need to provide personal information when filing a BOI report - and may be practical if one anticipates filing multiple BOI reports. Each entity or individual is entitled to only one FinCEN identifier.