Cosigning a Car Loan: What You Are Signing Up For

Updated September 2026 · 4 min read

Cosigning is not a character reference - it is a promise to pay the loan if the borrower cannot. The lender can come after you for the full balance without first chasing the primary borrower, and every missed payment lands on your credit report.

What it does to your finances

• The loan shows on your credit report as your debt, raising your debt-to-income ratio.
• Late or missed payments damage your score as if the loan were yours.
• A repossession can follow you for years, and the lender can sue you for the shortfall.
• Your own borrowing power drops while the loan is open.

When cosigning helps

A cosigner with strong credit can get a borrower approved and lower the rate. That can be genuinely helpful for a student or a first-time buyer with a thin credit file. The benefit is real - but so is the exposure.

How to protect yourself

• Put the agreement in writing: who pays, when, and what happens if they miss.
• Get online access to the loan so you can see every payment.
• Ask to be notified before any late payment.
• Consider being a co-owner on the title so you have legal standing.
• Plan to refinance the loan into the borrower's name alone once their credit improves.

Refinancing is the cleanest exit - see the refinance guide. If the borrower is working on their credit, the credit score guide explains what lenders look for.

Frequently asked questions

Can I be removed as a cosigner later?

Only if the borrower refinances in their own name or the lender agrees to release you. Until then you remain liable.

Does cosigning affect my credit if all payments are on time?

It can help by adding a positive, seasoned account, but the debt still counts against your income.