What Is a Co-Borrower? Using a Co-Borrower on Your Loan

By Jamie Cattanach. December 12, 2024 · 6 minute read

This content may include information about products, features, and/or services that SoFi does not provide and is intended to be educational in nature.

What Is a Co-Borrower? Using a Co-Borrower on Your Loan

Loans have become an integral part of American financial life. We need a mortgage to buy our first home, and an auto loan to purchase a car. More recently, people are turning to personal loans to cover surprise bills and avoid high-interest credit card debt. But just because you need a loan doesn’t mean a lender is going to give you the loan — and interest rate — you want.

If you’re struggling to qualify for a loan, a friend or family member may be able to help by becoming a co-borrower. By leveraging their income, credit score, and financial history, you may qualify for better loan terms. Let’s dive into the details.

Key Points

•   A co-borrower shares responsibility for loan repayment and ownership of purchased property, unlike a cosigner who only supports the loan application.

•   Applying with a co-borrower can improve loan terms due to combined financial profiles.

•   Lenders consider credit scores, income, employment, and debt-to-income ratios when evaluating co-borrowers.

•   Co-borrowing can lead to better loan terms, but both parties are equally liable for repayment.

•   On-time payments can boost credit scores, while missed payments can negatively impact credit.

Understanding Co-Borrowers

As you’re considering your options, a natural first question may be, what is a co-borrower? Essentially, a loan co-borrower takes on the loan with you, and their name will be on the loan with yours. They will be equally responsible for paying the loan back and will have part ownership of whatever the loan buys. When you take out a mortgage with someone, the co-borrower will own half the home.

Spouses often co-borrow when buying property, and when taking out a personal loan for a home improvement or remodeling project. In other circumstances, two parties become co-borrowers in order to qualify for a larger loan or better loan terms than if they were to take out a loan solo.

Having a co-borrower can help two people who both want to achieve a financial goal — like first-time homeownership or buying a new car — put in a stronger application than they might have on their own. The lender will have double the financial history to consider, and two borrowers to rely on when it comes to repayment. Therefore, the loan is a less risky prospect, which may translate to more favorable terms.

Recommended: All About Variable Interest Rate Loans

Qualifying as a Co-Borrower

If you’re planning to have a co-borrower on your personal loan application, it helps to understand what criteria you both must meet in order to be accepted by the lender. Let’s take a closer look at common factors lenders consider.

Credit Score

A credit score can have a significant impact on whether your loan application is approved and what terms you’re offered. There’s no magic number, but generally speaking, lenders prefer to see a score of 670 or higher. You and your co-borrower may want to check your credit scores for free before you apply.

Proof of Income and Employment

To help them determine whether co-borrowers can afford loan payments, a lender will likely want to see proof of a stable income and employment. You both may be asked to provide recent pay stubs, tax returns, and bank statements. You might also be asked to show a letter from your employers verifying your employment status, how long you’ve both been employed, and your salaries.

Debt-to-Income Ratio

Debt-to-income ratio, or DTI ratio, is a comparison of your monthly debts to your gross monthly income (before taxes). Lenders use this information to help determine how risky it would be to loan money to a borrower. It can affect your ability to borrow money and the interest rate you’ll receive. Generally, lenders like to see a DTI that’s no higher than 36%, though there may be some wiggle room.

In addition to the above, lenders also usually consider:

•   Financial history. This includes recent bankruptcies, judgments, and liens.

•   Age. Many lenders have a minimum age for co-borrowers, typically 21 to 25 years of age.

•   Citizenship. Co-borrowers generally must be either citizens or permanent residents of the U.S.

Co-Borrower Process

Applying for a loan with a co-borrower? The application process is fairly similar to the one you’d follow if you were applying alone.

A good first step is to reach out to your lender and start the prequalification process. If your co-borrower has a strong credit profile, that could improve your odds of qualifying for better rates and terms.

Next, you and your co-borrower will need to complete the loan application. You’ll also both undergo credit checks, and the lender will evaluate your finances. You may be asked to provide documentation like pay stubs, bank statements, or tax forms.

Within a few days or so, you’ll find out if you’re approved and what your loan terms are. Once you agree to the terms, your loan funds will be disbursed, usually within a week. Your lender will also share details about how to make monthly payments.

Co-Borrower vs. Cosigner

A cosigner plays a slightly different role than a co-borrower. A cosigner’s income and financial history are still factored into the loan decision, and their positive credit standing benefits the primary applicant’s loan application. But a cosigner does not share ownership of any property the loan is used to purchase. And a cosigner will help make loan payments only if the primary borrower is unable to make them.

Cosigning helps assure lenders that someone will pay back the loan. Typically, a cosigner has a stronger financial history than the primary borrower. This can help someone get approved for a loan they might not qualify for on their own, or secure better terms.

No matter which route you choose, there are potential credit implications to keep in mind. For example, when you apply for a loan, the lender will likely do a hard credit pull. This may cause credit scores to temporarily dip for you and your cosigner or co-borrower.

Both parties may also see a drop in their credit score if monthly payments are late or missed altogether. (And remember, cosigners will be on the hook for making loan payments if the main account holder can’t.) On the flip side, on-time payments can help boost or build credit scores.

When should you choose a cosigner vs. a co-borrower? The answer depends on your situation and goals. If you intend on sharing ownership of whatever you buy with the loan, then a co-borrower may be a good choice. If you simply need someone with a strong credit history to bolster your loan application, then consider using a cosigner.

Recommended: What Is Revolving Credit?

The Takeaway

Taking out a loan is a big decision, and doing so with a co-borrower carries additional risks. A co-borrower is a partner in the loan and any property the loan is used to purchase. If one borrower cannot make their payments, the co-borrower will be on the hook for the full amount. But if both parties can come to an agreement about how they’ll handle any financial hardships, co-borrowing can have major benefits. By pooling their income and debt, they may lower their debt-to-income ratio and qualify for a mortgage or personal loan with a lower interest rate and better terms.

Think twice before turning to high-interest credit cards. Consider a SoFi personal loan instead. SoFi offers competitive fixed rates and same-day funding. Checking your rate takes just a minute.


SoFi’s Personal Loan was named NerdWallet’s 2024 winner for Best Personal Loan overall.


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