By Frederick Blum, Blum Realty Group
If your credit score made a home purchase too expensive—or kept you from qualifying—it may be worth asking your lender a new question: can you evaluate my loan using VantageScore 4.0?
That is not a credit-repair pitch. On September 9, 2026, Fannie Mae expanded VantageScore 4.0 from a limited rollout to broad availability for its approved lenders. An eligible borrower may now have another way for a lender to evaluate the credit history behind the application. Fannie Mae’s September 9 announcement
The opportunity is real. The automatic savings people may assume from the headline are not. A different model might help your situation, produce no meaningful change, or be unavailable through the lender or loan program you are using. The useful next step is a properly priced comparison, not celebrating a bigger number on a screen.
What changed—and what did not
Fannie Mae-approved lenders can now use VantageScore 4.0 for eligible loans evaluated through Desktop Underwriter Version 12.1, Fannie Mae’s automated underwriting system. Lenders that are not ready can continue using Classic FICO. This is another permitted option, not an order requiring every lender to switch immediately. Fannie Mae’s lender letter
That distinction matters when you call a loan officer. “Fannie Mae allows it” and “we can actually process your loan that way today” are different answers. Ask about your specific application, the lender’s systems, and the intended loan program.
This article addresses Fannie Mae’s eligible conventional loans. Do not assume the announcement automatically changes FHA, VA, jumbo, or a bank’s own portfolio-loan requirements. Those need a separate program-specific answer.
Why a different model could matter to you
A credit score is the result of a model evaluating information—not a universal grade that every lender calculates the same way.
Fannie Mae says newer models can incorporate information such as reported on-time rent history and patterns in credit use over time, potentially allowing more consumers to be scored. That does not mean every rent payment is automatically on your credit report or that everyone receives a higher score. Fannie Mae’s explanation of credit-score modernization
For a San Diego buyer, the practical reason to investigate is straightforward: if the earlier financing answer was based partly on your credit, you should understand whether the available options have changed before treating that answer as permanent.
I would especially raise the question if you received an unattractive quote earlier this year, have a limited credit history, or were told that your credit profile was the sticking point. Those are reasons to ask for a review, not predictions that the review will come back better.
Ask the lender to explain what actually constrained the earlier application. If it was income, available funds, the property, or an excessive total payment, changing the scoring model may not solve it. Start with the reason, then test the possible solution.
A higher score does not automatically mean a cheaper mortgage
This is the part of the announcement I would not skip.
Fannie Mae’s September 9 pricing matrix uses different score bands for Classic FICO and VantageScore 4.0. For a purchase loan longer than 15 years at exactly 80% loan-to-value, a 730 Classic FICO score and a 750 VantageScore 4.0 score both fall in bands with a 1.250% credit-score/loan-to-value adjustment. At 770 VantageScore, that adjustment is 0.875%. Other adjustments, waivers, and lender pricing can also apply. Fannie Mae’s pricing matrix, page 2
In that illustration, the first 20-point increase produces no difference in this adjustment. The second comparison differs by 0.375% of the loan balance: $2,625 on a hypothetical $700,000 loan.
That is a pricing-component calculation—not a promised borrower credit, closing-cost reduction, or interest-rate decrease. A loan-level price adjustment is not the mortgage interest rate. The lender must show how the complete pricing becomes your actual rate and costs.
These scores are separate hypothetical outcomes, not a conversion formula. You cannot add 20 or 40 points to your FICO score to predict a VantageScore.
Ask for numbers you can actually compare
“Your new score is higher” is interesting. “Here is how your payment, cash to close, and approval options change” is useful.
Have the lender hold the basic scenario steady: the same property price, down payment, loan amount, loan term, occupancy, and rate-lock period. Otherwise, a lower payment could simply reflect a larger down payment or a different loan structure rather than a benefit from the credit model.
When you are at the application stage, compare Loan Estimates. The Consumer Financial Protection Bureau recommends reviewing estimates from multiple lenders; the standardized form is designed to help compare the actual financing terms. CFPB’s mortgage-comparison guidance
Look at the interest rate, points or lender credits, lender charges, mortgage insurance if applicable, estimated monthly payment, and cash needed at closing. Confirm whether each quoted rate is locked and when the lock expires. A Loan Estimate is not final loan approval. CFPB’s Loan Estimate review guide
There is also a difference between cheaper financing and a larger approved purchase price. If an updated analysis makes a more expensive home possible, you still get to decide whether that payment is comfortable. Approval is not a household budget.
Six questions to send your lender
- Can you use VantageScore 4.0 for my specific loan today, and is there a reason Classic FICO would still be the better or required path?
- Would reviewing the alternative require another credit inquiry, another report fee, or additional processing time?
- What is the actual underwriting result—not just the score—and what conditions would remain?
- Can you show the pricing comparison without changing my down payment, loan term, points, or rate-lock period?
- If I am applying with another borrower, how does the combined application affect the result?
- If I am already in escrow, can this be completed without putting my financing contingency, rate lock, or closing date at risk?
Get the answers before authorizing a new report or restructuring a loan already in progress. There is no benefit in discovering a theoretical improvement that cannot be completed within your transaction’s deadlines.
If you want to connect that conversation to a realistic purchase plan, start with BRG’s San Diego home-loan resources. Bring the price range, down payment, current quote, and any explanation the lender gave you—not sensitive account numbers in a general contact form.
Keep the home itself in the financing conversation
A better credit result does not make every property equally affordable or equally easy to finance.
For a condo, the building’s eligibility can matter separately from the buyer’s approval. Our San Diego condo mortgage project-approval guide explains why you should ask about both before relying on a preapproval.
For any home, keep taxes, insurance, HOA dues, special assessments, and maintenance in the monthly picture. The San Diego ownership-cost checklist helps organize that review. Saving on financing is useful; overlooking a separate recurring cost can erase the benefit.
And if the property has an existing FHA or VA loan that might be assumed, that is a different financing path—not a feature of VantageScore. Our assumable-mortgage guide covers the servicer approval, cash gap, and seller protections that need their own review.
Common questions about the new mortgage credit-score option
Is VantageScore 4.0 required for every new mortgage?
No. Fannie Mae permits eligible lenders to use it for eligible loans, but adoption is optional. Your lender may still use Classic FICO. Confirm what is available for your application rather than assuming every advertised mortgage has changed.
Can each borrower on a joint application use whichever model gives them the higher score?
Not under this Fannie Mae option. The same model must be used for all borrowers on one loan. When VantageScore 4.0 is selected, the lender requests that model from all three credit bureaus. Fannie Mae’s current implementation requirements
What about manually underwritten loans and FICO Score 10T?
Fannie Mae still requires Classic FICO for manually underwritten loans. Its current guidance also says FICO Score 10T is not yet available for loans delivered to Fannie Mae. Approval of a model for future use is not the same as availability for your loan today. Fannie Mae’s current implementation requirements
Should I restart a loan that is already close to closing?
Do not restart it based on a headline. Ask your loan officer for a specific assessment of the potential benefit, added cost, required review, and effect on your deadlines. Keep the existing plan intact unless you understand the consequences of changing it.
The takeaway: ask the question, then follow the actual result
I would not tell a buyer that a new scoring model suddenly makes an unaffordable home affordable. I would tell them not to rely forever on an old financing answer when a meaningful new option has become available.
Ask whether the lender can evaluate it. Find out whether it improves the actual loan. Then use that answer to choose a home and payment that work for you.
If you are ready to turn those numbers into a focused San Diego home search, contact me with your target areas, budget, and timing. We can keep the property search and financing conversation moving together.
Rules checked September 11, 2026. This is general information, not a loan approval, rate quote, or promise of savings. Availability, qualification, and pricing depend on the borrower, property, lender, and loan program. Mortgage services are provided through Home Loan Advantage, Inc.; Frederick Blum NMLS #1914546, company NMLS #2468904.