How High LTV Refinance Underwriting Works
High LTV refinance loans follow a streamlined underwriting process that's much simpler than traditional refinances. The program assumes you've already proven your creditworthiness by making payments on your existing Fannie Mae loan.
Most high LTV refinance loans go through Desktop Underwriter (DU), Fannie Mae's automated system. When you submit your loan application, DU automatically searches for your existing loan using your property address and Social Security number. If it finds a match, the system confirms you're the same borrower and processes your loan under the high LTV refinance guidelines.
Say you bought your home in 2019 with a Fannie Mae loan and now want to refinance to a lower rate. DU will locate your original loan, verify your identity, and apply the relaxed underwriting standards. The entire process happens behind the scenes.
Payment History Requirements
Your payment history on the existing loan is the most critical factor. You can have no more than one 30-day late payment in the 12 months before your refinance application. This means if you were 30 days late in March and 30 days late in July, you don't qualify.
The payment history requirement is strict but clear. A single 30-day late payment won't disqualify you, but two will. The lender will pull your mortgage payment history directly from the loan servicer to verify this requirement.
Credit and Income Requirements Are Minimal
Unlike traditional refinances, high LTV refinance loans have no minimum credit score requirement. The lender still pulls your credit report for pricing purposes and to check for any judgments, but there's no score threshold you must meet.
Debt-to-income ratios also don't apply. The program assumes that if you've been making payments on a similar or higher payment amount, you can handle the new loan payment. This eliminates the need for detailed income calculations and debt analysis.
However, if your loan goes through the Alternative Qualification Path (typically for borrowers being added or removed), standard credit score and DTI requirements do apply. See B5-7-03: High LTV Refinance Alternative Qualification Path for those specific rules.
Employment and Asset Verification
The employment verification requirement is remarkably simple. Your lender needs just one of these three things:
- A verbal verification of employment (a phone call to your employer)
- Documentation of non-employment income like Social Security or pension payments
- Proof of liquid reserves equal to 12 months of your new mortgage payment
Let's say your new mortgage payment will be $2,400 per month. If you have $28,800 in checking, savings, or investment accounts, that satisfies the verification requirement even without contacting your employer.
The lender doesn't need to verify your income amount, calculate your debt-to-income ratio, or assess whether your income will continue. They just need to confirm you have some source of income or adequate reserves.
Property Valuation Options
DU may offer "value acceptance" for your refinance, meaning no appraisal is required. The system uses automated valuation models and property data to determine your home's value. This option saves time and the $400-600 appraisal cost.
If DU doesn't offer value acceptance, you'll need a full appraisal with interior and exterior inspection. The appraiser will visit your home and prepare a complete appraisal report just like in a traditional refinance.
For manually underwritten loans, an appraisal is always required. There's no value acceptance option for manual underwriting.
Required Documentation
Every borrower must complete IRS Form 4506-C (Request for Transcript of Tax Return) at or before closing. This gives Fannie Mae the right to obtain your tax transcripts after the loan closes for quality control purposes.
Beyond the 4506-C form and basic employment verification, documentation requirements are minimal. You won't need to provide pay stubs, tax returns, bank statements, or asset verification unless your loan falls under the Alternative Qualification Path.
When Social Security Numbers Don't Match Perfectly
DU compares the Social Security numbers on your new loan application with those on your existing loan. Perfect matches process smoothly, but partial matches require lender verification.
If DU matches 7 or 8 digits of your 9-digit Social Security number, it will flag this for your lender to confirm you're the same borrower. This might happen if there was a data entry error on your original loan or if you've legally changed your Social Security number.
When you're adding a spouse to the loan who wasn't on the original mortgage, DU will detect this and may require the Alternative Qualification Path with full underwriting requirements.
Property Status and Listing Requirements
Unlike traditional refinances, lenders don't need to verify that your home isn't currently listed for sale. This eliminates one potential roadblock and speeds up the process.
If your property was damaged in a disaster, repairs aren't required before loan closing as long as you maintain proper insurance coverage. The lender doesn't need to inspect the property or order a new appraisal after disaster damage.
Common Complications
The most common issue occurs when borrowers are being added or removed from the loan. If your original loan had two borrowers but your refinance application shows only one, DU will flag this for manual review and potentially require the Alternative Qualification Path.
Second homes and investment properties must receive an "Approve/Eligible" recommendation from DU. If DU returns any other recommendation, these properties can't use the streamlined high LTV refinance process.
Address discrepancies can also cause problems. If your property address on the new application doesn't match the address on file for your existing loan, DU may not recognize the connection. Make sure your lender uses the exact same address format as your original loan.
References
For the official guidelines, see B5-7-02: High LTV Refinance Underwriting, Documentation, and Collateral Requirements for the New Loan in the Fannie Mae Selling Guide.
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Original Fannie Mae Guideline Text
B5-7-02, High LTV Refinance Underwriting, Documentation, and Collateral Requirements for the New Loan (09/03/2025)
Underwriting Requirements
Employment, Income, and Asset Verification
Underwriting Methods
High LTV refinance loans may be underwritten using DU or manually, with the exception of loans subject to the Alternative Qualification Path (which must be manually underwritten). Loans secured by a second home or an investment property must be underwritten in DU and receive an Approve/Eligible recommendation, unless they are required to be underwritten in accordance with the Alternative Qualification Path (see B5-7-03, High LTV Refinance Alternative Qualification Path).
Loans Underwritten in DU
When a limited cash-out refinance loan casefile that meets the minimum LTV requirement for a high LTV refinance loan is underwritten in DU, internal data will be used to determine if Fannie Mae owns the loan on the property, and if that loan is eligible to be refinanced using the high LTV refinance option.
When DU finds a loan for the subject property address using either the address provided on the DU loan application or the standardized address, DU will then confirm that the Social Security number(s) for the borrower(s) on the new loan casefile match those on the existing loan. The result of the Social Security number matching will be specified in a DU message.
When none of the borrower Social Security numbers match, the loan casefile will not be underwritten as a high LTV refinance loan. DU will issue a message informing the lender that the Social Security number(s) does not match and remind the lender to confirm the property address.
When there is a Social Security number match, DU will underwrite the loan casefile as a high LTV refinance loan. If the Social Security number for any of the borrowers on the loan casefile do not match using all nine digits, DU will advise the lender.
When a borrower Social Security number is matched using 7 or 8 digits of the 9-digit Social Security number, the DU message will specify that the Social Security numbers are one or two digits different and will require the lender to confirm the borrowers on the existing loan are the same borrowers that will be on the new loan.
When there are two borrowers on the new loan and two borrowers on the existing loan, but only one borrower’s Social Security number matches, the DU message will specify that not all of the borrower Social Security numbers match and will require that the lender confirm the borrowers on the existing loan are the same borrowers that will be on the new loan.
When one borrower is on the new loan casefile but more than one borrower is on the existing loan, the DU message will state that it appears that a borrower is being removed with transaction and refer the lender to the Selling Guide for additional requirements on removing a borrower with a high LTV refinance transaction.
When there is more than one borrower on the new loan casefile but there is only one on the existing loan, the DU message will state that it appears that a borrower is being added with the high LTV refinance transaction, and if that is the case, the high LTV refinance loan is not eligible for delivery.
Manually Underwritten Loans
The lender must determine that all eligibility requirements are met for manually underwritten loans.
Underwriting Requirements
The following table provides underwriting and documentation requirements applicable to high LTV refinance loans.
Underwriting and Documentation Requirements
Payment History
To be eligible for the high LTV refinance option, the payment history for the existing loan for the most recent 12 months must reflect
DTI Ratio
There are no maximum DTI ratio requirements except for loans underwritten under the Alternative Qualification Path.
Credit Score
There is no minimum credit score requirement except for loans underwritten under the Alternative Qualification Path.
Lenders must obtain and review a merged credit report in accordance with standard Selling Guide policies for payment history and pricing purposes. However, lenders are not required to comply with the waiting period and re-establishment of credit requirements for significant derogatory credit events or the payoff or satisfaction of a judgment identified on the credit report. Also, lenders are not required to review or consider
Property Status
The lender does not need to confirm the subject property is not currently listed for sale.
Request for Transcript of Tax Return
Each borrower must complete and sign a separate IRS Form 4506-C at or before closing. See
Employment, Income, and Asset Verification
The lender must obtain one of the following for the new loan:
a verbal verification of employment for employment or self-employment income for at least one borrower,
documentation of a non-employment income source, or
documentation of liquid financial reserves equal to 12 months of the new monthly housing payment.
With the exception of loans underwritten under the Alternative Qualification Path, lenders are not required to
assess continuity of income,
verify income,
verify assets, or
calculate the DTI ratio.
Valuation Requirements
For certain loan casefiles, DU will offer value acceptance or value acceptance + property data - options to sell the loan to Fannie Mae without an appraisal. Otherwise, an appraisal with an interior and exterior inspection is required. If an appraisal is obtained, it must be used for valuation even if value acceptance is offered by DU.
A lender may only exercise the high LTV refinance value acceptance or value acceptance + property data offer if
the final submission of the loan casefile to DU resulted in an offer,
an appraisal is not obtained for the transaction, and
the offer is not more than four months old on the date of the note and the mortgage.
Lenders exercising the high LTV refinance value acceptance offer must deliver Special Feature Code 807 or 774 for value acceptance + property data.
When the lender is required by law to obtain an appraisal, the lender must comply with such requirements, but may still exercise the offer.
For manually underwritten loans, an appraisal with an interior and exterior inspection is required.
Repairs to a property damaged as the result of a disaster (as defined by this Selling Guide) are not required prior to loan sale as long as the loan meets the applicable property insurance requirements. The lender is not required to perform an additional inspection and/or new appraisal of the property after a disaster.
The table below provides references to the Announcements that have been issued that are related to this topic.
