Why does the following question, ‘Provide the Request for Taxpayer Identification and Certification (W-9) Document’, appear under collateral owner and not borrower?

In the closing phase, one instance of the W-9 is selected for each borrower, cosigner, guarantor and collateral owner for the transaction.

If a party has more than one role on the transaction like borrower and collateral owner only one instance of the document will be selected for that party.

If there is a collateral owner and that is their only role on the transaction then you are given the option to select a W-9 for that party.