80-10-10 piggyback vs a 90% jumbo in San Diego
Quick answer: An 80-10-10 piggyback keeps the first mortgage at or under the 2026 San Diego County 1-unit high-cost line of $1,104,000 and puts a second lien behind it. A 90% jumbo is one first mortgage above that line. Which wins depends on the file, the investor, and the second-lien payment. I am not posting invented rates here.
A lot of San Diego contracts sit just over the 2026 1-unit high-cost conforming line of $1,104,000. Shoppers hear two pitches: take one 90% jumbo first, or split the loan so the first stays at or under $1,104,000. The county jumbo overlay is jumbo loan limits San Diego 2026. The product guide is jumbo loans in San Diego. This post is the 80-10-10 vs 90% jumbo split.
Left Coast Leaders, Inc. (NMLS #2394495) prices both on the same address. Amir Nurani (NMLS #197458) will not quote a canned piggyback rate. The second lien is a real payment.
What 80-10-10 actually is
80 is the first mortgage, about 80% of the lesser of purchase price or appraised value. 10 is a second lien. 10 is cash down. The useful part in San Diego is keeping that first at or under $1,104,000 so it can still be high-balance conforming instead of jumbo. $832,750 is the national baseline, not the county ceiling. Amounts from $832,751 through $1,104,000 are high-balance on a 1-unit.
If the purchase price is high enough that 80% of value is still above $1,104,000, the piggyback does not save you from jumbo. Math first. Do not assume 80% automatically lands under the line.
| Structure | What you are actually taking |
|---|---|
| 80-10-10 piggyback | First at about 80% (hopefully at or under $1,104,000) plus a second lien plus about 10% down |
| 90% jumbo first | One first mortgage above $1,104,000 with about 10% down |
| High-balance first, more cash | Bring the loan down to $1,104,000 or less with extra down payment and skip the second |
| $832,750 baseline talk | That is the national low-balance line, not the San Diego County 1-unit cap |
Where a 90% jumbo still wins
One note is easier to close, easier to refinance, and easier for a future sale. Jumbo investors often want stronger credit, more reserves after closing, and cleaner income. Those overlays are real. They are not a published county table. See jumbo reserve months in San Diego for why I will not invent a reserve number.
If the second-lien payment, the second-lien rate, or a balloon or HELOC feature on the 10% is worse than the jumbo overlay, take the jumbo. If the first can stay high-balance and the second is cheap enough that the combined payment still wins, take the piggyback. File-specific.
The second lien is not free money
Seconds can be a closed-end second, a HELOC, or a lender-specific piggyback product. Terms vary. Some seconds reprice. Some have a draw period. Combined loan-to-value, combined DTI, and how the second is underwritten all sit on the file. A pretty first-lien quote that ignores the second is not a payment.
Title, escrow, and recording still see two deeds of trust. That is extra paperwork, not invented dollar amounts. We talk through the file before you write. Related: low down payment conventional in San Diego and San Diego County conforming loan limits 2026.
Run both on the same contract
Same address. Same down payment. Same tax, insurance, and HOA. One column is 80 plus 10. The other is one 90% jumbo. If you can bring more cash and stay at or under $1,104,000 with a single first, that is a third column. Get the structure named on the San Diego mortgage pre-approval before the offer.
Frequently asked questions
It is two liens: a first mortgage at about 80% of value, kept at or under the 2026 1-unit high-cost conforming figure of $1,104,000 when the numbers allow, plus a second lien for about 10%, with about 10% down in cash. The first can stay conforming or high-balance. The second is a separate note with its own payment, rate, and underwriting.
One first mortgage is simpler to close and to refinance later. It is also a jumbo once the loan is above $1,104,000. Jumbo overlays on credit, reserves, and documentation are usually tighter than a high-balance first. Simpler is not always cheaper. We price both on the same contract.
The first lien at 80% is usually structured so monthly PMI is not on that note. You still have a second-lien payment. A 90% jumbo may use lender-paid or borrower-paid mortgage insurance, or an overlay that does not use PMI the same way. I will not invent a PMI factor. Run both payments including the second lien.
Shopping above the $1,104,000 line in San Diego?
We will price an 80-10-10 piggyback next to a 90% jumbo on the same address before you write.
Get Pre-Approved(619) 366-9494 · Amir Nurani · NMLS #197458
Left Coast Leaders, Inc. · NMLS #2394495 · DRE #02191517 · Equal Housing Lender · San Diego, CA