What Prop 19 Portability Is
Proposition 19 (effective April 1, 2021) allows California homeowners who are 55 or older to sell their primary residence and transfer their existing Prop 13 assessed value to a replacement home anywhere in California — even if the new home is in a different county. Prior to Prop 19, this transfer was limited to the same county or a handful of participating counties.
The significance for Coachella Valley buyers: if you own a home in the Bay Area, Los Angeles, or anywhere in coastal California with a low Prop 13 basis — the result of buying years ago at a lower price — you can bring that low tax basis with you to your desert retirement home. The savings are not symbolic. For many buyers they exceed $60,000 over a 10-year ownership period.
The Prop 19 Transfer Formula
If new home price ≤ old home market value:
New assessed value = your old basis (full transfer)
If new home price > old home market value:
New assessed value = old basis + (new price − old market value)
Worked Examples — Coachella Valley Buyers
Bay Area seller — downsize scenario
Bay Area seller — lateral price move
LA seller — upsizing slightly
Out-of-state seller — no Prop 19 available
Prop 19 does not apply to out-of-state sellers
Prop 19 portability only applies to California homeowners transferring a California Prop 13 basis. If you are selling a home in Oregon, Washington, Colorado, Texas, Arizona, or any other state, you have no transferable California tax basis. Your new Coachella Valley home will be assessed at its full purchase price, and Prop 13 will then cap future increases at 2% per year from that new baseline.
Out-of-state sellers still benefit from Prop 13's annual increase cap — just not from the portability provision. Make sure your retirement budget reflects the full purchase price assessment for your first year.
Eligibility Requirements
- ✓You must be 55 years or older at the time of the sale of the original property (or severely disabled, or a disaster victim — but for most readers this is the age requirement)
- ✓The home you are selling must be your principal residence — not a rental, vacation home, or investment property
- ✓The replacement property you purchase must also become your principal residence
- ✓You must purchase or newly construct the replacement home within two years of the sale date of the original property
- ✓You must file a claim with the county assessor's office — the transfer is NOT automatic and requires active application
- ✓The benefit can be used up to three times in your lifetime (a change from the old one-time limit under Props 60/90)
Filing the claim: the step most buyers miss
Proposition 19 portability is not automatic. After closing on your new Coachella Valley home, you must file a Homeowner's Exemption claim AND a Proposition 19 Base Value Transfer claim with the Riverside County Assessor. The forms are available at assessor.rivco.org. Many buyers skip this step and pay full assessed value for months before catching the error.
File the claim as soon as possible after closing. The assessor applies the portability benefit prospectively from when the claim is processed, so delays cost real money. Consult a California real property tax advisor or your escrow company for exact timing requirements.
The three-use limit — and why it matters for active movers
Under Prop 19, you can transfer your tax basis up to three times in your lifetime. Prior law (Props 60 and 90) allowed only one transfer. This change is particularly relevant for active retirees who may downsize once and then relocate again to be closer to family or medical care.
If you have used a transfer under the old Props 60/90, that counts as one of your three lifetime uses under Prop 19. A California property tax specialist can advise you on where you stand if you have previously transferred a basis.
This guide is informational — consult a California tax professional
Proposition 19 calculations involve specific legal and factual determinations that depend on your individual ownership history, the timing of your transactions, and the specific assessed values established by the county. The worked examples above are illustrative estimates, not tax advice. Before filing a Prop 19 claim, consult a California real property tax attorney or CPA familiar with county assessor procedures.