Answer:
The purpose of the W-9 is to provide certifications regarding a taxpayer identification number. If the loan is to an individual and secured by real estate you do need an SSN. However, the TIN does not have to be certified; i.e. you do not need a W-9. If the loan is to anything other than an individual or is not secured by real estate, you do not even need a TIN. The characterization of the loan, consumer vs. commercial, is not relevant.
First published on BankersOnline.com 9/15/03