What happens to the co-signer if the primary borrower stops paying?

How co-signer liability works: A co-signer is equally and immediately liable for the debt from day one. This is not a secondary or contingent liability - both the primary borrower and co-signer are jointly and severally liable, meaning the lender can choose to pursue either or both for the full balance. When the primary borrower stops paying, the lender's most efficient path is typically to pursue the co-signer first (because they often have better credit, meaning they likely have more assets and better wage garnishment potential).

Credit impact on the co-signer: Every payment history event on the loan is reported to the credit bureaus under both the primary borrower's and co-signer's accounts. A 30-day late payment from the primary borrower appears on the co-signer's credit report within 30-45 days. A default appears on both reports and can drop the co-signer's score by 80-150 points. The co-signer has no control over what the primary borrower does, but suffers the full credit consequences.

Options for a co-signer when the primary borrower stops paying: (1) Make the payments yourself to protect your credit (and then pursue the primary borrower separately for reimbursement). (2) Contact the lender to negotiate a payment plan - as co-signer, you have full account access and legal standing to communicate with the lender. (3) If the primary borrower files bankruptcy, the co-signer's liability is not discharged by the bankruptcy (only the primary borrower's). (4) Sue the primary borrower for breach of contract or indemnification (which most formal co-signer agreements support).

Before co-signing: Treat a co-sign as a personal guarantee that you will pay if asked. Only co-sign for someone whose income you can verify, whose spending habits you understand, and whose debt you could absorb if necessary.