Rocket Mortgage Switches to VantageScore 4.0. What a New Default Credit Score Means for Buyers in San Diego and Chicago

The score a lender pulls is changing. Rocket Mortgage will make VantageScore 4.0 its default credit model, according to HousingWire. The lender says a four-month test covering 1.4 million credit reports helped some borrowers qualify and led to better pricing for some of them. HousingWire also reports that UWM chief Mat Ishbia has publicly backed the same model, so this is more than one lender's experiment.

For decades, most buyers never had to think about which scoring model sat behind their mortgage approval. That is starting to change. Two of the largest lenders in the country are now leaning toward a model built to read credit files differently, and that could shift who qualifies and at what rate.

Why this matters in our markets

In San Diego, entry prices are high enough that a small change in rate or approval odds decides whether a buyer can compete at all. A buyer with a thin credit file, such as a younger professional, a recent transplant, or someone who has rented and paid cash for years, may find that a different model scores them more fairly. Even a modest improvement in pricing adds up on a large loan balance.

In Chicagoland, where many first-time buyers move from renting in the city to owning in the suburbs, the same logic applies. Buyers who were close to a qualifying threshold under the older model may now clear it.

What buyers should do now

Do not assume the score on your banking app is the score your lender will use. Ask every lender you speak with which credit model it runs and whether it can compare results. Rocket's test found that some borrowers came out ahead, which also means results will vary. Some buyers may see little difference.

If you were told in the past year that your credit held you back, it is worth getting quoted again. The answer may be different now.

What sellers should know

A wider pool of qualified buyers is good news for sellers, especially in price bands where financing, not interest, has been the limit. More approvals can mean more offers that actually close.

Our team works with lenders who can explain these changes in plain terms. If you are planning a purchase in San Diego or Chicago, we can connect you with lenders who will show you how this new model affects your numbers before you start touring homes.