A co-signer is a person who agrees to take on equal legal responsibility for a loan alongside the main borrower. Lenders allow a co-signer when the borrower's own credit history or income is not strong enough to qualify on their own.
How a co-signer helps: the lender also considers the co-signer's credit and income. A co-signer with strong credit can help the borrower get approved — or qualify for a better interest rate — than they could alone. Co-signers are common for younger borrowers, those new to credit, and student or auto loans.
What a co-signer takes on — this is important:
- If the borrower does not pay, the co-signer is fully responsible for the debt.
- The loan appears on the co-signer's credit report and counts toward their debt-to-income ratio.
- Late or missed payments damage both people's credit scores.
Co-signer vs. co-borrower: a co-borrower shares ownership and use of what the loan pays for (and the responsibility). A co-signer simply backs the loan — they are responsible for the debt but do not necessarily share the asset.
Before you co-sign: only do it for someone you trust completely, and be sure you could afford the payments yourself if you had to. To explore options, see RMO personal loan options.