What You're Actually Responsible For as an Auto Loan Co-Signer
A co-signer is legally responsible if the main borrower stops paying
When you co-sign an auto loan, you are not just vouching for someone — you are legally liable for the entire debt if they do not pay. The lender can come after you for the full remaining balance, not just a portion. They do not have to pursue the main borrower first; they can skip straight to you.
This means if the borrower misses payments, stops making them, or walks away from the car, the lender will report the missed payments to credit bureaus under your name. Your credit score will drop. If the debt goes to collections, a collector can sue you. You could end up owing thousands of dollars you did not borrow.
Co-signing is different from being a co-owner. A co-owner has rights to the vehicle itself. A co-signer has only obligations — you have no claim to the car and no say in what happens to it, but you are on the hook for the money.
Key Takeaways
- The lender can pursue you for the full loan balance if the main borrower defaults, without first attempting to collect from them.
- Missed payments will appear on your credit report and lower your credit score, affecting your own ability to borrow money.
- You have no legal rights to the vehicle itself, even though you are responsible for the debt.
- Removing yourself as a co-signer requires the lender's permission and usually means the borrower must refinance the loan in their name alone.
- Before co-signing, you should know the full loan amount, the monthly payment, and the borrower's payment history with other debts.
How the lender can collect from you
Once you sign the promissory note, the lender treats you and the main borrower as equally responsible. If a payment is 30 days late, the lender reports it to the credit bureaus. If payments are 90 days late, the lender may repossess the vehicle. At that point, the lender sells the car at auction, and if the sale price is less than what is owed, you and the borrower are both liable for the shortfall — called a deficiency.
The lender can garnish your wages, place a lien on your property, or freeze your bank account to collect. They do not need your permission to do any of this; the promissory note you signed gives them that right. If the debt is not paid and goes to collections, a debt collector can sue you in court.
The lender also has no obligation to tell you when the borrower misses a payment. You will find out when the damage to your credit is already done. Some lenders will notify you if you ask, but it is not required.
The impact on your credit and borrowing power
Every late payment on the loan appears on your credit report, even if you did not make the payment yourself. Your credit score drops with each missed payment, and the damage gets worse the longer the account is delinquent. A repossession or charge-off will stay on your report for seven years.
A damaged credit score makes it harder and more expensive for you to borrow money. Lenders will see you as higher-risk and may deny you for a mortgage, car loan, or credit card. If they do approve you, you will pay a higher interest rate. This can cost you thousands of dollars over the life of a loan.
Even if you are not the one missing payments, the debt counts against your debt-to-income ratio — the amount you owe compared to what you earn. This ratio matters when you apply for any new loan. A high ratio can disqualify you or lower the amount a lender will give you.
What you cannot control as a co-signer
You have no right to know how the borrower is treating the vehicle or whether they are maintaining it. You cannot force them to make repairs, keep insurance active, or even keep the car. If they let the insurance lapse and get in an accident, you are still liable for the loan debt — the lender does not care that the car is damaged.
You also cannot force the borrower to make on-time payments, even if you are the one whose credit is suffering. You have no legal recourse against them if they default. Your only option is to pay the loan yourself to protect your own credit, or to let it default and deal with the consequences.
If the borrower sells the car without paying off the loan, the new owner does not assume the debt — you and the main borrower still owe it. The lender can repossess the vehicle from the new owner and still come after you for any shortfall.
How to remove yourself as a co-signer
Removing yourself requires the lender's permission. There is no legal way to simply walk away from a co-signed loan. The lender has no obligation to release you, and most will not unless the borrower can refinance the loan in their name alone.
To explore this option, contact the lender and ask about co-signer release or removal. Some lenders have a formal process; others do not offer it at all. If they do, the borrower will need to apply for a new loan to pay off the old one, and they will need to may have access to on their own credit and income. If their credit has worsened since the original loan, they may not may have access to.
Another option is for the borrower to refinance with a different lender. Again, they must may have access to on their own. If they cannot, you are stuck as a co-signer until the loan is paid off or until you pay it off yourself.
Questions to ask before you co-sign
Before you sign, get the full loan details in writing: the total amount borrowed, the interest rate, the monthly payment, and the loan term. Ask the borrower why they need a co-signer — if their credit is too poor to borrow on their own, that is a signal that the risk is real.
Ask the lender directly what happens if the borrower defaults. Some lenders will work with you to modify the loan or set up a payment plan; others will not. Ask whether the lender will notify you of missed payments and whether there is a co-signer release option.
Check the borrower's payment history on other debts. Ask them directly whether they have ever missed a payment on a credit card, car loan, or rent. If they have, you are taking on significant risk. Consider whether you can afford to pay the full loan yourself if you have to, because that is the realistic scenario you are signing up for.
Frequently Asked Questions
Can the lender come after me before they try to collect from the main borrower?
Yes. The lender can pursue you immediately for the full balance without first attempting to collect from the main borrower. You have no right to demand they pursue the borrower first. Some states have laws that require the lender to exhaust collection efforts against the borrower before pursuing a co-signer, but South Carolina does not.
What happens to my credit if the borrower makes all the payments on time?
On-time payments will help your credit score, just as they help the main borrower's. The loan will appear on your credit report as an account in good standing. However, the debt still counts against your debt-to-income ratio when you apply for other loans, even if payments are current.
If I pay off the loan myself, can I sue the borrower to get the money back?
You can sue the borrower in civil court, but winning a judgment does not may provide you will collect the money. You would need to prove the borrower owed you that money, and even with a judgment, collecting can be difficult if the borrower has no assets or income. Consult a lawyer about whether a lawsuit makes sense in your situation.
Does co-signing affect my ability to get a mortgage?
Yes. The co-signed loan counts as debt on your credit report and raises your debt-to-income ratio. Mortgage lenders look at this ratio carefully, and a high ratio can disqualify you or reduce the amount they will lend you. The impact is the same whether you are making the payments or the borrower is.
Can I remove myself as a co-signer if the borrower is making payments on time?
Only if the lender agrees. On-time payments do not automatically release you. You would need to ask the lender about a co-signer release program, or the borrower would need to refinance the loan in their name alone. Most lenders will not release a co-signer unless the borrower can may have access to for a new loan independently.