I’m Michael DiVita — DRE #01372066 | NMLS #241655, DiVita Home Finance (DRE #01818285 | NMLS #323700), Tiburon, CA. I’ve been in California mortgage lending since 2000 and founded DiVita Home Finance in 2007. Prop 19 portability changes the mortgage math for California homeowners over 55 in ways most lenders don’t factor in — I do. Call (800) 239-1103.
California Proposition 19 changed the rules for property tax transfer in a way that dramatically affects the buy-versus-stay decision for California homeowners over 55. If you’re sitting on a low property tax base and thinking about upsizing, downsizing, or relocating anywhere in California, understanding Prop 19 changes the math on your mortgage entirely.
What Prop 19 Did
Prop 19 (passed November 2020, effective April 2021) expanded the ability of California homeowners who are 55 or older, severely disabled, or victims of wildfires or natural disasters to transfer their existing Prop 13 assessed value to a replacement home — anywhere in California, up to three times in their lifetime. Under the previous rules (Prop 60/90), this transfer was limited to same-county moves (with limited inter-county agreements) and could only be used once. Prop 19 removed the county restriction entirely and extended portability statewide, making it available for moves from Marin to Sonoma, from San Francisco to San Diego, or from Los Angeles to the Central Valley.
Why This Transforms the Mortgage Calculation
Property tax is a major component of monthly housing cost in California. Consider a Marin County homeowner who bought in 1992 for $400,000 and has an assessed value of around $650,000 today after annual Prop 13 adjustments. Their annual property tax is approximately $8,100 — about $675/month. If they buy a new $1,800,000 home without Prop 19 transfer, their new assessed value is $1,800,000 and property tax jumps to approximately $22,500/year — $1,875/month. That’s an increase of $1,200/month just in taxes, every month, permanently. With Prop 19 transfer on a same-price purchase, they carry their existing assessed value — keeping taxes at $675/month. On a replacement that costs $200,000 more, the partial adjustment formula pushes taxes up only slightly. Either way, the savings versus full reassessment are $10,000–$20,000/year or more.
How Prop 19 Affects Your Mortgage Qualification
Mortgage lenders use PITI — principal, interest, taxes, and insurance — to calculate monthly housing expense for DTI purposes. A lower property tax bill due to Prop 19 transfer directly reduces your PITI, which lowers your DTI, which increases how much you can borrow. On a $10,000/month income borrower with a 43% DTI cap, a $1,200/month reduction in monthly property taxes could add roughly $160,000 in loan capacity. I factor the Prop 19-adjusted tax base into every pre-qualification for eligible California homeowners over 55 — because the standard quote using market-value taxes significantly understates what you can afford.
The Timing Requirement
To claim the Prop 19 tax base transfer, you must file a claim with the county assessor’s office within one year of selling your original home or purchasing the replacement home, whichever is later. The replacement home must be your primary residence within one year of purchase. Missing this window forfeits the benefit — it’s not retroactive. I flag this for every eligible client so the filing gets done on time.
Frequently Asked Questions — California Prop 19 and Mortgages
Can I use Prop 19 to buy a more expensive home in a different California county?
Yes — that’s one of the key improvements Prop 19 made over prior law. Under Prop 19, you can transfer your assessed value to a replacement property anywhere in California, regardless of which county the new property is in. A homeowner in Marin County can sell their longtime home and buy in Sonoma, San Diego, Sacramento, or any other county while carrying their low Prop 13 assessed value with them. The replacement home must be your primary residence, and if it costs more than the sale price of the old home, the assessed value is adjusted upward by the difference — but you still come out well ahead of a full market-value reassessment.
How does Prop 19 affect my debt-to-income ratio when applying for a mortgage?
Positively and significantly. Property taxes are included in your PITI — the monthly housing expense lenders use to calculate DTI. If Prop 19 reduces your annual property taxes from $22,000 to $8,000 on the replacement property, that’s $14,000/year or $1,167/month less in PITI. At a 43% DTI, that $1,167 reduction can support approximately $155,000 in additional loan amount. I calculate the Prop 19-adjusted PITI for the replacement property when modeling your pre-qualification, which often shows clients they qualify for significantly more than a standard quote suggests.
How many times can I use Prop 19 portability in California?
Up to three times in your lifetime. Each sale-and-replacement that uses the Prop 19 transfer counts as one of your three uses. Most homeowners use it once when they’re ready to move — perhaps after retirement, after children leave home, or after a change in health. But the three-lifetime limit means you have flexibility: if you use it once to move at 58, you still have two transfers available for future moves at 65 or 75. Each transfer requires that the replacement property is your primary residence and that you meet the qualifying criteria (age 55+, severely disabled, or wildfire/disaster victim) at the time of the sale.
Talk to Michael Directly
DiVita Home Finance | Tiburon, CA | In lending since 2000, founded DiVita Home Finance in 2007. Michael DiVita DRE #01372066 | NMLS #241655. Company DRE #01818285 | NMLS #323700.
💬 Text: (310) 849-9124
