---
id: guide-0034
title: "When do I need a co-signer, and how does it work?"
category: guide
subtopic: cosigner
page_type: guide
source_url: "https://www.castlecdjrnaperville.com"
tags: ["financing", "credit", "guide"]
questions:
  - "What is a co-signer?"
  - "Do I need a co-signer to buy a car?"
  - "How does co-signing affect the other person?"
  - "Will a co-signer help me get approved?"
related: [finance-approval, first-time-buyer, credit-score]
dealer: Castle CDJR of Naperville
---

A co-signer is someone who agrees to share responsibility for your loan. If you can't make a payment, the lender can ask the co-signer to pay instead. Co-signers are most helpful if you have limited credit history, a lower credit score, or are a first-time buyer-they can improve your approval odds and sometimes lower your interest rate.

### What it means for the co-signer
The co-signer's credit score and finances may both be affected. The loan shows up on their credit report and counts toward their debt, which can affect their ability to borrow later. They're taking real risk, so choose someone who understands and trusts you.

### How it works at Castle CDJR of Naperville
Our finance team will work with you and your co-signer through the application and paperwork. They'll explain exactly what the co-signer is committing to and answer any questions. Call (630) 864-6683 to discuss whether a co-signer makes sense for your situation-our team can walk you through options and help you get the best terms possible.