A $900,000 home in Irvine needs a mortgage of $720,000 at 20% down. That's below the $1,249,125 conforming limit for Orange County, so it qualifies as a conforming loan. The same $900,000 home in a baseline county like Riverside needs the same $720,000 mortgage, but the conforming limit there is $832,750. Still conforming. Now price that home at $1.1M, put 10% down, and you're borrowing $990,000. In Orange County, still conforming. In Riverside, that's a jumbo loan. Same borrower, same credit, different county, different loan category.
A jumbo loan is any mortgage that exceeds the conforming loan limit for the county where the property sits. Fannie Mae and Freddie Mac won't buy these loans, so lenders hold them on their own books or sell them to private investors. That distinction used to mean significantly higher rates. It doesn't anymore.
The Rate Myth
For years, jumbo loans carried a rate premium of 0.25-0.50% above conforming. Borrowers assumed paying more was the cost of borrowing more. That relationship has flipped. In early 2026, well-qualified jumbo borrowers are seeing rates at or slightly below conforming on many programs. A borrower with a 760 FICO, 25% down, and strong reserves might lock a jumbo rate 0.125% lower than the equivalent conforming rate.
Why? Jumbo borrowers tend to have excellent credit, significant assets, and low default rates. Lenders compete aggressively for these borrowers because the loans perform well. Banks in particular like holding jumbo loans on their balance sheets because the borrower profile fits their risk appetite.
The rate advantage disappears quickly for weaker profiles. Below 720 FICO or above 80% LTV, jumbo pricing gets noticeably worse than conforming. The "jumbo loans are cheaper" story only applies to borrowers who bring strong credentials.
What Qualification Actually Requires
Jumbo underwriting is tighter than conforming because there's no government backstop. The lender bears all the risk, so they set higher bars.