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Will Co-signing On a Loan Hurt My Credit Score?

Mark Cappel
UpdatedApr 18, 2024
Key Takeaways:
  • Co-signing a loan comes with great risk.
  • It is difficult to remove yourself as a loan co-signer.
  • Co-signing will increase your DTI ratio.

My boyfriend has terrible credit. Will it affect my credit if I co-sign a loan with him?

My boyfriend has horrible credit due to non-payments and a mortgage foreclosure. His debts have been settled recently. If I co-sign a loan with him, will it affect my credit?

Co-signing a loan with someone could harm your credit rating, especially if the primary borrower fails to make the loan payments as required. It can also affect your ability to get a loan in the future because your debt-to-income ratio will include this loan. Let us discuss each of these in detail.

Co-Signer Liability

As a co-signer, you are guaranteeing payment in case the primary borrower defaults. The lender will report the account as a derogatory item on your credit reports if the primary borrower fails to pay.

Your co-signing allows the primary borrower to obtain more favorable loan terms and to begin rebuilding a credit rating by offering the opportunity to establish new accounts with positive payment histories.

However, if the primary borrower does not repay the loan as agreed, the co-signer shoulders the debt. If the co-signer is unable or unwilling to pay it, the co-signer's credit will likely drop significantly. A drop in credit score may not only make it more difficult to obtain new credit, but can result in increases in the interest rates on current debts, as creditors may decide the co-signer has become a higher default risk.

Debt-to-Income Ratio

Depending on the co-signer's credit history, co-signing a loan could lower the co-signer's credit score even if the primary borrower makes all payments on time, as this new debt will increase the amount of outstanding debt in the co-signer's credit profile. This, in turn, increases the co-signer's "debt-to-income" or "debt-to-available-credit" ratio (different lenders use different phrases), which is one of the major factors used in calculating a credit score.

Do Not Co-Sign on a Loan

Because of the risks associated with being a co-signatory on a loan, I generally discourage it. In my capacity at, in my personal life, and elsewhere, I have seen too many people who have co-signed loans for people whom they trusted end up in serious financial hardships when their friend or loved one failed to pay the debt as promised. Co-signing for your partner could put a serious strain on your relationship, especially if he is unable to repay the loan. Also, if the social relationship ends, you two would be tied together financially until the loan is repaid. There is no "we broke up so I'm not a co-signer anymore" clause excusing you from the contract in any loan document I have seen.

Think twice before co-signing a loan. Are you really prepared to make the payments should the primary borrower stop making the payments for any reason? That is what co-signing a loan obligates you to do. It is not a just a convenience. It is not an empty gesture. It is a legal liability hanging over you as long as the debt is unpaid.

Go Ahead, Co-Sign on a Loan

On the other hand, helping loved one improve his credit rating could benefit you both, especially if you and he are planning to purchase a home together in the near future, as his current weak credit score could make obtaining a joint mortgage loan more difficult.


Because I do not know the details of your situation, your histories, the reasons why the primary borrower's credit is in disarray, or the dynamics of your relationship, I cannot tell you whether it makes sense for you to co-sign a loan. However, you should not co-sign a loan without carefully considering all possible consequences to your credit, your financial health, and your relationship with the primary borrower.

If the primary borrower's goal is to improve his credit rating, he may want to consider alternative methods such as opening a small credit card and paying it off each month. If he cannot find a credit card due to his current credit problems, he could open a secured credit card. A secured credit card requires the cardholder to deposit the account balance with the card issuer before the account is opened. Each month, the cardholder replenishes the account balance to that it always shows a positive balance. Secured card issuer's report on-time payments just like any other credit card bank, so this is a good option for people with poor credit who wish to establish new positive trade lines on their credit reports.

To learn more about credit reporting, and various methods that may help your boyfriend improve his credit score, I invite you to visit the credit resources page. Though the process of building a positive credit history can take several years or longer, and once he has rebuilt his credit rating, he will hopefully be able to borrow the money he needs without needing you to as a co-signer on the debt.

I hope this information helps you Find. Learn & Save.



Debt statistics

If you are struggling with debt, you are not alone. According to the NY Federal Reserve total household debt as of Quarter Q4 2023 was $17.503 trillion. Student loan debt was $1.601 trillion and credit card debt was $1.129 trillion.

A significant percentage of people in the US are struggling with monthly payments and about 26% of households in the United States have debt in collections. According to data gathered by from a sample of credit reports, the median debt in collections is $1,739. Credit card debt is prevalent and 3% have delinquent or derogatory card debt. The median debt in collections is $422.

Each state has its rate of delinquency and share of debts in collections. For example, in South Carolina credit card delinquency rate was 4%, and the median credit card debt was $402.

While many households can comfortably pay off their debt, it is clear that many people are struggling with debt. Make sure that you analyze your situation and find the best debt payoff solutions to match your situation.



JJanet Jones, Dec, 2022
My husband and I were trying to get our first mortgage. We were already working with a mortgage officer, but were running into an issue. My husband's mortgage scores were too low, but I can’t get approved. I applied for a Wells Fargo credit card and was denied because of too many inquiries. I checked my credit report and there are 31 auto loan inquiries from 10/2021. I did not get the car though I was approved, I also had medical debt, I got 2 bills the same amount on the same day from the hospital. I found a collection on my credit report in November 2021 for the duplicate. Debt is almost 2k and a year old, my credit score was at EQ-525, TU-519 and EX-514. We were depressed because we couldn’t get approved for our mortgage loan. Big THANKS to my loan officer who referred me to CYBER SPACE to help me fix my credit report. I contacted them immediately on Cybspace279 at GMAIL dot COM and I got a reply, I explained my predicament to them and they assured me to get the job done within the maximum of 5 days. To my greatest surprise Cyber Space has really done a great job in my credit report 31 auto loans have been wiped off and medical debt removed. My credit score has been increased to EQ-805, TU-801 and EX-807. And we’ve been approved for our mortgage loan. Thanks Cyber Space.