Being a cosigner can build your credit or hurt it, depending entirely on whether the primary borrower pays on time. The account appears on your credit report just as it appears on theirs, so every on-time payment strengthens your payment history, and every late payment damages your score the same way it damages the borrower’s. You are also legally responsible for the full balance if they stop paying.
How a Cosigned Account Shows Up on Your Credit Report
When you cosign, the lender reports the account to the major credit bureaus and lists you as a party to the debt. It appears as a tradeline on your file, with the account type, open date, credit limit, balance, and full payment history. For scoring purposes, the entry on your report looks essentially the same as the one on the borrower’s report. That shared record is why cosigning cuts both ways: the same tradeline that can lift your score is the one that can sink it.
One practical catch is that many lenders don’t automatically send you statements or give you online access, even though you’re on the hook. Ask for monthly statements or online account access when you sign so you can see payments as they post.1Consumer Financial Protection Bureau. Should I Agree to Co-Sign Someone Else’s Car Loan?
How Cosigning Can Build Your Credit
Payment history is the biggest factor in a FICO Score, worth 35%.2myFICO. What’s in Your Credit Score Each month the borrower pays on time, that positive mark lands on your report too. Over years, a well-managed cosigned loan builds a steady record of meeting obligations.
Length of credit history makes up another 15% of a FICO Score.2myFICO. What’s in Your Credit Score A cosigned installment loan that stays open and current for several years adds to the average age of your accounts, which scoring models reward.3VantageScore. Is Age a Factor in Your Credit Score?
If your file is heavy on one type of account, cosigning something different (an auto loan when you only have credit cards, for instance) adds credit mix, which counts for 10% of a FICO Score.4myFICO. Types of Credit and How They Affect Your FICO Score The effect is small, so this alone is never a good reason to cosign.
How Cosigning Can Hurt Your Credit
The Initial Dip
Applying as a cosigner triggers a hard inquiry on your credit report, which can shave a few points off your score. New credit accounts for 10% of a FICO Score.5myFICO. How New Credit Impacts Your Credit Score The new account also lowers the average age of your accounts, often causing another small dip. Both effects typically fade within a few months.
Utilization on a Cosigned Credit Card
If you cosign a credit card or other revolving line, the entire balance counts toward your credit utilization. Amounts owed make up 30% of a FICO Score.2myFICO. What’s in Your Credit Score If the borrower carries a $4,500 balance on a $5,000 limit, your report shows 90% utilization on that tradeline. That can drag your score down even if every other account you have sits at zero, and you have no control over how much they charge.
Missed Payments, Charge-Offs, and Collections
Negative events hit your credit report just as hard as they hit the borrower’s. Most consumer lenders report a payment as late once it’s 30 days past due, and the damage gets worse at 60, 90, and 120 days. A late payment can stay on your report for up to seven years from the date of the original delinquency.6Office of the Law Revision Counsel. 15 USC 1681c – Requirements Relating to Information Contained in Consumer Reports
Many lenders won’t notify you when the borrower first misses a payment, so you may not find out until the account is seriously delinquent. By then the credit damage is done. If the account goes unpaid for roughly 120 to 180 days, the lender may charge off the debt and sell it to a collection agency, which creates a new negative entry on your report. Both the charge-off and the collection can remain for up to seven years.6Office of the Law Revision Counsel. 15 USC 1681c – Requirements Relating to Information Contained in Consumer Reports
The Debt-to-Income Problem
Your credit score isn’t the only thing lenders look at. When you apply for a mortgage or another major loan, they calculate your debt-to-income ratio by dividing your monthly debt payments by your gross monthly income. The full payment on any cosigned loan counts as yours in that math. A $500 cosigned car payment reduces the mortgage you qualify for by $500 of monthly obligation, even if the borrower has paid every bill on time.
There’s one notable exception on conventional mortgages. Fannie Mae guidelines let a lender exclude a cosigned debt from your debt-to-income ratio if the primary borrower has made 12 consecutive on-time payments with no delinquencies. You’ll need to provide 12 months of canceled checks or bank statements from the borrower proving it.7Fannie Mae. Monthly Debt Obligations If you expect to apply for a mortgage while a cosigned loan is still open, keeping those records organized is worth the effort.
What Happens If the Borrower Defaults
Cosigning creates joint and several liability, which means the lender can come after you for the full remaining balance without first trying to collect from the borrower. If a lender or collection agency sues and wins a judgment, that judgment can be enforced through wage garnishment or bank account seizures. Federal law caps ordinary wage garnishment at the lesser of 25% of your disposable earnings or the amount by which your weekly earnings exceed 30 times the federal minimum wage.8Office of the Law Revision Counsel. 15 USC 1673 – Restriction on Garnishment Some states set lower limits.
If the lender eventually settles for less than the balance or writes it off, the forgiven amount is generally treated as taxable income. The creditor reports it on IRS Form 1099-C, and you have to include it on your tax return for the year the cancellation happened.9Internal Revenue Service. Topic No. 431, Canceled Debt – Is It Taxable or Not? Exceptions exist, including an exclusion for insolvency and for debts discharged in bankruptcy.10Office of the Law Revision Counsel. 26 USC 108 – Income From Discharge of Indebtedness If you’re facing a canceled cosigned debt, a tax professional can tell you whether you qualify.
How to Protect Your Credit Before and After Signing
If you decide to cosign, a few steps limit the downside:
- Ask the lender to send monthly statements or give you online access so you can catch a late payment before it posts to your credit.1Consumer Financial Protection Bureau. Should I Agree to Co-Sign Someone Else’s Car Loan?
- Confirm before signing whether the loan has a cosigner release provision and what the borrower has to do to qualify. Private student loans sometimes offer release after 12 to 48 months of on-time payments, provided the borrower meets credit and income requirements on their own.
- Factor the full monthly payment into your own debt-to-income ratio, especially if you plan to apply for a mortgage in the next few years.
- Set up credit monitoring alerts so a new late mark or balance jump on the cosigned account reaches you quickly.
Getting your name off the account later usually requires one of three things: a formal cosigner release from the lender, the borrower refinancing the loan in their name alone, or paying the loan off in full. A loan modification that removes a cosigner is possible but uncommon. Until one of those happens, the account stays on your credit report and you remain liable for the balance. When it does close in good standing, the positive history can continue to help your credit for up to ten years.