Yes, cosigners generally do need good credit. Most lenders want a FICO score of at least 670, and many prefer 740 or higher before they will accept you as a cosigner. The score is the entry ticket, not the whole test: lenders also weigh your income, your existing debts, and how steady your work history looks, because the point of adding you to the loan is to give the lender a backup who is clearly stronger than the primary borrower on their own.
The Credit Score Lenders Expect
670 is the floor of the “good” credit tier on the FICO scale. Scores from 740 to 799 are “very good,” and 800 and above is “exceptional.” Either of those higher tiers makes a cosigner application noticeably stronger. Below 670, most lenders will either turn the application down or come back with worse terms, since a cosigner whose credit looks similar to the borrower’s does not give the lender the safety net the arrangement is supposed to provide.
Exact cutoffs move around by lender and by loan type. A mid-600s score might still clear the bar for some personal or auto loans; conventional mortgage lenders tend to be stricter.
FHA Loans Work Differently
Government-backed FHA loans set a much lower minimum: 500 for any borrower, including a non-occupant co-borrower, which is FHA’s version of a cosigner. A 3.5 percent down payment requires at least 580. There is a catch worth understanding before you agree to sign an FHA loan: when more than one borrower is on the loan, the lender uses the lowest score among all of them to determine eligibility. A co-borrower with weak credit can pull the application down instead of propping it up.1HUD.gov. FHA Single Family Housing Policy Handbook
One boundary worth flagging: on FHA mortgages, anyone on the loan must take title to the property and is treated as a full borrower, not a cosigner in the ordinary sense.1HUD.gov. FHA Single Family Housing Policy Handbook On personal loans and student loans, a cosigner typically has no ownership stake. Ask the lender to spell out your exact role before you sign.
Income, Employment, and Debt-to-Income
Credit score alone rarely carries a cosigner application. Lenders also run the numbers on your debt-to-income ratio, comparing your total monthly debt payments to your gross monthly income. For manually underwritten conventional mortgages, Fannie Mae’s baseline maximum DTI is 36 percent, stretching to 45 percent for borrowers with higher scores and cash reserves. Loans run through Fannie Mae’s automated underwriting can go as high as 50 percent.2Fannie Mae. Debt-to-Income Ratios Auto and personal loan companies set their own thresholds, but the underlying expectation is the same: after your own bills, you should have enough disposable income to cover the full payment on the cosigned loan if it lands on you.
Employment history matters too. Lenders generally want two years of consistent income, whether from one employer or the same line of work. Self-employed cosigners may have to hand over two years of tax returns to prove the income is stable.
What Cosigning Costs You Beyond Approval
A cosigned loan appears on your credit report as your obligation, because legally, it is. Every payment the primary borrower makes, on time or late, lands on your credit history as if you had borrowed the money yourself. On-time payments can build credit for both of you. Missed payments damage your score even though you never saw a dollar.
The initial application triggers a hard credit inquiry, usually costing fewer than five points and fading within a year. The bigger, longer-lasting effect is the loan itself: the balance sits on your credit file, and its payment history follows you.
It Squeezes Your Own Future Borrowing
When you later apply for your own mortgage, car loan, or credit card, lenders count the cosigned loan’s full monthly payment in your DTI. That can push you over the qualifying line for financing you actually want for yourself.
There is an exception. Fannie Mae allows a lender to exclude a non-mortgage cosigned debt from your DTI if the person actually making the payments is not an interested party to your transaction (the seller of the home you are buying, for example). The lender needs 12 months of canceled checks or bank statements from the primary borrower showing a clean payment record with no delinquencies.3Fannie Mae. Monthly Debt Obligations USDA loan guidelines follow a similar 12-month rule.4USDA Rural Development. HB-1-3555, Chapter 11 – Ratio Analysis Any late payment in the last 12 months, though, and the full monthly liability stays in your DTI regardless of who caused the delinquency.
If the Borrower Defaults, the Lender Comes for You
Federal regulations require the lender to give you a written notice before you become obligated. It spells out the stakes: if the borrower does not pay, you will. You may owe the full balance plus late fees and collection costs. The lender does not have to try collecting from the borrower first, and it can use the same tools against you it would use against the borrower, including a lawsuit and wage garnishment.5eCFR. 16 CFR 444.3 – Unfair or Deceptive Cosigner Practices
There is no federal rule requiring the lender to tell you when the borrower first misses a payment. By the time you find out, the account may already show as delinquent on your credit report. Late and missed payments stay on your report for seven years, and payment history is the largest single factor in your FICO score.
Canceled Debt Can Become Taxable Income
If the lender eventually forgives or settles the debt for less than what was owed, a tax problem can follow. When the cosigner and borrower are jointly and severally liable, the lender must file a Form 1099-C for each debtor once the forgiven amount hits $600, and the IRS generally treats canceled debt as taxable income. A cosigner classified strictly as a guarantor, rather than a joint debtor, may not receive a 1099-C, because IRS rules do not treat a guarantor as a debtor for reporting purposes.6Internal Revenue Service. Instructions for Forms 1099-A and 1099-C Which category you fall into depends on how the loan agreement is written, so read the contract before you sign it.
Getting Off the Loan Later
Getting off a cosigned loan is harder than getting on. The most reliable exit is a refinance: the primary borrower qualifies for a new loan on their own, that loan pays off the cosigned one, and your obligation ends. For auto loans, this is often the only realistic path.7Consumer Financial Protection Bureau. If I Co-Signed for a Private Student Loan, Can I Be Released From the Loan?
Some private student loan lenders offer a formal cosigner release program. These typically require the borrower to make a set number of consecutive on-time payments (commonly 12 to 48 months) and then show enough credit and income to carry the loan alone. Release is not automatic. The borrower has to apply, and the lender re-evaluates them at that point. Not every lender offers this, and terms vary, so check the original loan documents.
Asking the lender to simply take your name off the loan does not work. The cosigner agreement is a binding contract, and lenders have no obligation to change it on request.
Before You Cosign
Good credit qualifies you to cosign. It does not mean you should. It is worth checking whether the borrower has other paths first. Federal student loans, both subsidized and unsubsidized, do not require a cosigner or a credit check on the student. Secured loans backed by collateral like a savings account or certificate of deposit are sometimes available to borrowers who cannot get unsecured credit. Credit unions and community banks may underwrite more flexibly than large national lenders. A larger down payment reduces the lender’s risk without pulling anyone else’s credit onto the loan.
If the borrower is close to qualifying on their own, a few months of on-time payments or a paid-down balance may be enough to close the gap. Because a cosigned loan ties your credit, your DTI, and your legal exposure to someone else’s payments for years, treating it as a last option rather than a first one is a reasonable stance.