How is my credit file affected if I was a co-signer on a loan and the person on whose behalf I co-signed fell behind in their payments?

If you are a co-signer to a loan, the activities related to that loan will usually be reported by the credit grantor on both the file of the primary borrower and the co-signer. However, reporting policies may vary amongst credit grantors. Therefore where there is a default in payment, a note indicating that the loan is in default will appear on the credit file of the co-signer.