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A homeowner who bought in Laguna Niguel in 1998 may be paying property tax on an assessed value near $300,000, while the house that closed down the street last month is taxed near the $1,395,000 median. That gap is why a lot of long-time owners in South Orange County stay in a house that no longer fits. They want a single-level floor plan or a smaller yard, and they assume moving means their tax bill triples.
California Proposition 19 changed that for two groups of homeowners: people 55 and older, and people who are severely and permanently disabled. If you fall into either group, you can sell your current home, buy another one in California, and carry your existing taxable value with you. Under Prop 19 you can do it up to three times, even if you already used the old Proposition 60 or 110 transfer years ago.
How the math works
What moves is your taxable value, not your purchase price. The price of the replacement home decides how clean the transfer is:
- Buy the replacement before you sell, and you keep 100% of your old taxable value if the new home costs the same or less.
- Buy within one year after the sale, and the ceiling rises to 105% of your sale price.
- Buy in the second year after the sale, and the ceiling rises to 110%.
Going over the ceiling does not kill the transfer. Only the amount above the line gets added to your transferred value. Say your Laguna Niguel home sells for $1,300,000 and you buy in Aliso Viejo for $1,000,000, where the median sale price in July 2026 was $900,000. You are under the ceiling, so your old taxable value follows you untouched. If you bought at $1,450,000 instead, within the first year, roughly $85,000 would be added on top of your transferred value rather than the full $1,450,000 being reassessed.
Two years, and the order is up to you
The sale and the purchase have to fall within two years of each other. There is no required sequence. Plenty of Mission Viejo sellers buy first and sell after, because they would rather move once.
The transfer is also statewide. Your taxable value can follow you to any county in California, so a San Juan Capistrano seller can buy in Sacramento and keep it. Both homes have to be your primary residence.
Who qualifies, and what the county wants
For the age route, at least one owner on title has to be 55 or older on the date the original home sells. The claim form is BOE-19-B, filed with the assessor in the county where the replacement home sits. For Laguna Niguel, San Juan Capistrano, Mission Viejo and Aliso Viejo, that is the Orange County Assessor.
The disability route uses a separate claim form plus a physician’s certificate confirming a severe and permanent disability. There is no age minimum on this one. A 41 year old owner who qualifies uses it the same way a 70 year old does.
Timing on the paperwork matters. File within three years of buying the replacement home and the relief reaches back to your purchase date. File later and the assessor can still grant it going forward, but you lose the earlier years. Confirm the current filing window with the Orange County Assessor before you plan around it, and read the rules on the California Board of Equalization Proposition 19 page.
What to check before you list
Start with your assessed value from the Orange County Assessor parcel lookup. That number is often less than half of what a valuation site shows, and it is the one that travels.
Then read the tax bill on any home you are considering, because the extras do not transfer. Community Facilities District charges, better known as Mello-Roos, attach to the parcel you buy. Newer tracts in San Juan Capistrano such as Pacifica San Juan carry them. Most of Mission Viejo was built before those districts existed. Two homes at the same price can land more than a thousand dollars apart on the annual bill because of that one line.
If the reason for the move is a single-level floor plan or a zero-step entry, say so early. I can pull door widths and threshold heights on listings before you spend a Saturday driving between them.
Run your own numbers
I work with buyers and sellers across Laguna Niguel, San Juan Capistrano, Mission Viejo and Aliso Viejo, and my practice is queer-owned. If you want to see what your transferred tax bill would look like on a specific address, call or text me at (949) 257-2276 and we will work through it together. I am a Realtor and not a tax adviser, so I will tell you when to bring yours in.
