What Is a Co-Signer on a Loan? Pros, Cons, and What to Know

A co-signer is someone who agrees to be legally responsible for a loan if the primary borrower fails to make payments. Adding a co-signer can help you qualify for a loan or get a lower interest rate — but it comes with serious risks for both parties.

What Does a Co-Signer Do?

When you apply for a loan and do not meet the lender’s requirements on your own — because of low credit, limited credit history, or low income — the lender may require a co-signer.

The co-signer’s credit history and income are considered alongside yours. If your co-signer has strong credit, you are more likely to be approved and may receive a better interest rate.

If you stop making payments, the lender can come after your co-signer. The full debt becomes their responsibility.

Co-Signer vs Co-Borrower

These terms sound similar but they are different.

A co-signer is a backup. They are only responsible if the primary borrower defaults. They typically do not have ownership rights to whatever the loan was used for.

A co-borrower (or joint borrower) shares equal responsibility for the loan from day one. They also typically share ownership of the asset. A spouse on a joint mortgage is a co-borrower, not a co-signer.

When Do You Need a Co-Signer?

Lenders may require a co-signer when:

You have no credit history (common for young people or recent immigrants)
You have a low credit score (typically below 620 for most lenders)
Your income is too low to qualify for the loan amount you need
You have a history of missed payments or defaults

Common loans that use co-signers include student loans, auto loans, personal loans, and apartment lease agreements.

Benefits of Having a Co-Signer

Easier approval: Lenders are more willing to approve risky borrowers when a creditworthy co-signer backs the loan
Lower interest rate: A stronger co-signer can help you qualify for a lower rate, saving you money over the life of the loan
Credit building opportunity: If you make all payments on time, the loan helps build your credit history

Risks for the Co-Signer

Co-signing is a major financial commitment. Before agreeing to co-sign, every co-signer should understand these risks:

Full legal responsibility: If the primary borrower does not pay, the lender will demand payment from the co-signer
Credit damage: Late payments and defaults appear on the co-signer’s credit report, not just the borrower’s
Debt-to-income impact: The loan shows up on the co-signer’s credit report as their debt, which can affect their ability to get their own loans
Limited control: The co-signer does not receive the loan funds or own the asset, but bears full financial risk

Risks for the Primary Borrower

Relationship damage: If you miss payments and hurt your co-signer’s credit, it can permanently damage the relationship
Pressure to perform: Someone else’s financial wellbeing depends on your ability to pay

How to Get a Co-Signer Removed

There are a few ways to remove a co-signer from a loan:

Refinance: Apply for a new loan in your name only once your credit and income have improved. The new loan pays off the old one, releasing the co-signer.
Co-signer release: Some lenders allow co-signers to be released after you make a certain number of on-time payments (commonly 12 to 24 months). Check your loan agreement for details.
Pay off the loan: Once the loan is paid in full, the co-signer’s obligation ends.

What Co-Signers Should Do Before Agreeing

Review your own financial situation — can you afford to repay this loan if the borrower cannot?
Read the full loan terms before signing anything
Set up alerts so you are notified if a payment is late
Have an honest conversation with the borrower about expectations and consequences

Alternatives to a Co-Signer

If you cannot find a co-signer or do not want to put someone in that position, consider these options:

Secured loan: Offer collateral (a car, savings account) to reduce the lender’s risk
Credit builder loan: Specifically designed to help you build credit history from scratch
Secured credit card: Build credit with a small deposit as collateral
Improve your credit first: Spend six to twelve months paying down existing debt and building credit before applying