A cosigner generally needs a credit score of 670 or higher to be approved, though many lenders prefer 700 or above depending on the type of loan or lease. The exact threshold varies by lender and product, but the purpose of a cosigner is to offset the primary borrower’s weaker credit, so lenders expect the cosigner to bring a strong financial profile to the table.
Score Requirements by Loan Type
The minimum credit score for a cosigner depends on what you’re applying for. Here’s how the benchmarks typically break down:
- Personal loans: Most lenders look for a cosigner with a score of 670 or higher, which falls in the “good” credit range. Some lenders set their floor even higher, particularly for larger loan amounts or longer terms.
- Auto loans: A cosigner with a score in the mid-600s may qualify at some lenders, but a score of 700 or above will help secure a significantly lower interest rate. Subprime auto lenders may accept cosigners with lower scores, though the rates reflect the added risk.
- Private student loans: Lenders set their own criteria, but most expect cosigners to have good to excellent credit. Since many student borrowers have thin or nonexistent credit histories, lenders lean heavily on the cosigner’s profile. A score of 700 or higher is common for competitive rates.
- Apartment leases: Landlords and property management companies usually require a cosigner (sometimes called a guarantor) to have a credit score of 700 or above. This is often stricter than what’s asked of the tenant themselves.
- Mortgages: A non-occupant cosigner on a mortgage faces the same underwriting standards as the primary borrower. Conventional loans typically require a minimum score of 620, but the cosigner’s score and the borrower’s score are both evaluated, and the lower of the two often determines the loan’s pricing.
Credit Score Isn’t the Only Factor
A high credit score alone won’t guarantee approval as a cosigner. Lenders also evaluate income, employment stability, and debt-to-income ratio (DTI), which is the percentage of your gross monthly income that goes toward debt payments. For conventional mortgages, DTI for manually underwritten loans generally can’t exceed 45%, and loans run through automated underwriting top out at 50%. Other loan types have their own DTI limits, but most lenders want to see a cosigner’s DTI below 40% to 45%.
For apartment leases, the bar can be even more specific. Many landlords require a cosigner to prove income of three to four times the monthly rent, compared to the 2.5 to 3 times typically expected of the tenant. If the rent is $1,500, the cosigner may need to show $4,500 to $6,000 in monthly income.
Lenders also check for recent derogatory marks like bankruptcies, collections, or late payments. A cosigner with a 720 score but a recent collection account may still get denied, while a cosigner with a clean 680 might be approved.
What Cosigning Does to Your Credit
If you’re the person being asked to cosign, understand that this loan will appear on your credit report as your obligation. Lenders considering you for future credit, whether a mortgage, car loan, or credit card, will factor that cosigned debt into your DTI. Even if the primary borrower pays on time and you’re never asked to contribute a dollar, the loan still reduces your borrowing capacity.
The risk goes further than that. If the primary borrower misses payments or defaults, that negative history shows up on your credit report too. Late payments can drop your score significantly, and a default could lead to the lender pursuing you for the full balance. The FTC notes that a creditor can report the cosigned loan to credit bureaus as your debt, and the primary borrower’s payment behavior directly affects your credit score and payment history.
How to Strengthen a Cosigner Application
If the cosigner’s credit is borderline, a few steps can improve the odds of approval. Paying down revolving balances before applying lowers both the credit utilization ratio and DTI, addressing two concerns at once. Checking the cosigner’s credit reports for errors is also worth the time, since even a small reporting mistake can drag a score below a lender’s cutoff.
Shopping across multiple lenders helps too. Credit score minimums for cosigners are not standardized. One lender might require 700 while another approves cosigners at 660 with strong income. Credit unions in particular tend to be more flexible with cosigner requirements than large national banks. When you submit applications within a short window, typically 14 to 45 days depending on the scoring model, the credit inquiries are grouped together and counted as a single hard pull, so rate shopping won’t hurt the cosigner’s score.
When a Cosigner Release Is Available
Some lenders, particularly private student loan companies, offer a cosigner release option after the primary borrower meets certain conditions. These usually include making a set number of consecutive on-time payments (often 24 to 48 months) and demonstrating that the borrower now qualifies for the loan independently based on their own credit and income. Not all lenders offer this, so if the cosigner wants a path off the loan, ask about release terms before signing. Refinancing into the borrower’s name alone is the other common exit strategy once the borrower’s credit has improved enough to qualify solo.