LATAM context
For companies, the NIT is what they invoice, file and open business bank accounts with. For individuals it usually matches their national ID number plus a check digit. That final digit is frequently dropped when capturing it, and that's a common cause of rejection in electronic invoicing and bank records.
Concrete example
A company NIT is written as 900123456-7, where the 7 is the check digit.
How it shows up on your bank statement
On Colombian business account statements, the NIT appears in the header next to the company name. Inside transactions it shows up mainly in payments to entities and in collections, where the descriptor includes the beneficiary's NIT.
How does finO$ handle this?
finO$ reads the account holder's NIT from the statement header. That's useful for accounting firms managing several companies that need to route each file to the right client without opening it.