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Co-Signed Debt Qualification Guide

Qualifying When You Co-Signed a Car Loan Someone Else Pays

For mortgages following Fannie Mae’s rules, a lender may exclude a co-signed debt from your debt-to-income calculation when someone else’s payment history is documented. Here is that public guidance, and what it does and does not change about your own liability, without quoting rates or promising an approval.

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Excluding the payment from DTI does not excuse you from the loan.

Debt-to-income (DTI) compares your monthly debt obligations with the income used to qualify. A car loan you co-signed counts against that calculation by default, even if you have never made a payment on it.

For mortgages following Fannie Mae’s rules, a lender may exclude certain debts paid by someone else from the DTI calculation when the documentation supports it. That exclusion changes how the loan is underwritten — it does not change who the car lender can collect from if payments stop.

Bottom line: a documented 12-month payment history from the person actually paying the car loan can get it excluded from your DTI, but you remain legally responsible for the debt, and the exclusion alone does not guarantee approval.

What "excluded from DTI" means, in Fannie Mae’s public guidance.

A co-signed debt counts by default

Debt-to-income ratio divides total monthly obligations — including debts you are only a co-signer on — by the income used to qualify, unless an exclusion applies (Fannie Mae Selling Guide B3-6-05, dated Aug. 5, 2026).

Documented payments from someone else can exclude it

Fannie Mae permits a lender to exclude a monthly debt from DTI when the lender obtains the most recent 12 months of canceled checks, or bank statements, from the person actually making the payments, showing no delinquencies (Fannie Mae Selling Guide B3-6-05, dated Aug. 5, 2026).

The payer cannot be an interested party to the transaction

The person paying the debt cannot be a party with a financial interest in the sale, such as the seller or the real estate agent (Fannie Mae Selling Guide B3-6-05, dated Aug. 5, 2026).

The DTI exclusion and your liability on the loan are two different questions.

Fannie Mae’s rule addresses how a lender calculates your debt-to-income ratio. It does not address, and does not change, your legal responsibility as a co-signer.

What the exclusion requires

Fannie Mae’s Selling Guide allows a lender to exclude a monthly debt payment from the borrower’s DTI calculation when the lender documents, with the payer’s most recent 12 months of canceled checks or bank statements, that someone else has been making the payments without delinquency (Fannie Mae Selling Guide B3-6-05, dated Aug. 5, 2026).

Who can be the payer

Fannie Mae’s rule does not require the person making the payments to also be named on the loan. It does require that the payer not be an interested party to the property transaction, such as the seller or the listing or selling agent.

What a missed payment changes

The documentation has to show payments without delinquency. A payment history with missed or late payments does not meet the standard, and a lender would calculate the debt into DTI in the usual way.

Why co-signing still carries risk

The CFPB notes that co-signing a loan means agreeing to be responsible for the debt if the primary borrower cannot pay, and that missed payments can affect the co-signer’s credit (CFPB, last reviewed Sep. 12, 2023). Excluding the payment from a mortgage DTI calculation does not release a co-signer from the underlying car loan.

Do not let half-true mortgage advice drive the file.

"Co-signing means I’m not really responsible for the loan"

No. The CFPB notes a co-signer agrees to be responsible for the debt if the primary borrower cannot pay, and that missed payments can affect the co-signer’s credit, regardless of how a mortgage lender treats the debt.

"Any proof the other person pays is enough"

Not automatically. Fannie Mae’s rule requires the payer’s most recent 12 months of canceled checks or bank statements, documented without delinquency.

"The seller can just say they’ll keep paying it"

No. The payer cannot be an interested party to the transaction, such as the seller or a real estate agent involved in the sale.

Keep the borrower path connected.

Sources checked October 8, 2026. This page is informational, not a loan approval, APR disclosure, legal advice, or commitment to lend. Debt exclusion documentation and interested-party rule: Fannie Mae Selling Guide B3-6-05, "Monthly Debt Obligations" (dated Aug. 5, 2026). Co-signer responsibility and credit impact: Consumer Financial Protection Bureau, "Should I agree to co-sign someone else’s car loan?" (last reviewed Sep. 12, 2023; original publication date not stated). DTI eligibility depends on the specific loan, the borrower’s full file, and final underwriting. No rates are quoted on this page.

Want your co-signed debt reviewed?

Bring your most recent statement on the co-signed loan, 12 months of the payer’s canceled checks or bank statements, and your other monthly debts. We will review the real file before you count on any number.

Questions to Bring to Your Review

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