The Rules of Proposition 19 Portability: Where You Can Move, How Many Times, and How Long You Have

Proposition 19 lets qualifying California homeowners carry their low property tax base to a new home anywhere in the state. Three rules set the limits: you can move to any of California's 58 counties, you can use the benefit up to three times in your lifetime, and the sale of your old home and the purchase of your new one must happen within two years of each other. Miss the window or wait too long to file, and you can lose part or all of the benefit.

Key Facts

• Proposition 19 allows intercounty transfers — you can move your tax base to a replacement home in any of California's 58 counties. You are no longer restricted to the same county.

• If you qualify by age (55 or older) or disability, you may use the transfer up to three times in your lifetime. The count is per person, so each spouse on title has their own three transfers.

• Wildfire and disaster victims are not subject to the three-transfer lifetime cap in the same way — their benefit can apply once per qualifying disaster.

• The sale of your original home and the purchase (or construction) of your replacement must fall within a two-year window of each other, in either order.

• File your claim within three years of buying the replacement home and you get retroactive relief — the assessor applies your low base back to the date you became eligible. File after three years and you get only prospective relief, losing the benefit for the years you waited.

Can You Move Your Tax Base to a Different County?

Yes. Proposition 19 allows transfers to any of California's 58 counties. The county your replacement home sits in does not matter.

This changed the rules significantly. Under the old Propositions 60 and 90, a transfer usually had to stay within the same county. Only a handful of counties voluntarily accepted transfers from elsewhere. If you wanted to move across a county line — say, from Sacramento to Placer, or from Los Angeles to San Diego — you often had to leave your low tax base behind.

Proposition 19 eliminated that restriction. A move where the replacement home sits in a different county from the original is called an intercounty transfer, and every county in California must honor it. You can move toward family, toward a different climate, or toward a lower cost of living anywhere in the state and bring your low tax base with you.

How Many Times Can You Use the Prop 19 Transfer?

If you qualify by age (55 or older) or by severe and permanent disability, you may use the tax base transfer up to three times over your lifetime. Once all three are used, the benefit is gone.

The count tracks the individual, not the household. If both spouses hold title, each has their own three-transfer limit. A couple is not limited to a shared pool of three — they each have their own count, which gives a household more flexibility over time.

Wildfire and disaster victims are treated differently. Because their benefit is tied to a qualifying disaster, not to personal circumstances, they are not held to the same three-lifetime cap. The benefit can apply once per qualifying disaster. Chapter 6 covers the disaster rules in full.

What Is the Two-Year Window for a Prop 19 Transfer?

The sale of your original home and the purchase or construction of your replacement home must both happen within two years of each other. The order does not matter — you can buy before you sell or sell before you buy — but both events must fall inside that two-year span.

If more than two years pass between the two events, the transfer does not qualify regardless of your age or disability status.

The two-year window also determines how much of a timing cushion you get on the value comparison (covered in Chapter 4). Buying before you sell produces no cushion. Buying within the first year after selling gives your original home's value a 5 percent bump for the comparison. Buying within the second year gives it a 10 percent bump. The window controls both whether you qualify and how favorable your new taxable value will be.

What Happens If You File Your Claim Late?

Filing on time is just as important as qualifying. You file your claim with the assessor in the county where your replacement home sits, and when you file changes how much benefit you receive.

File within three years of purchasing or completing your replacement home and you get retroactive relief. The assessor applies your transferred base back to the date you became eligible, and any tax you overpaid in the meantime can be corrected.

File after three years and you get only prospective relief. Your low base applies going forward from the date you file, but you cannot recover the extra tax you paid during the years you waited. Those years are permanently forfeited.

The practical advice is simple: file within a few months of closing on your replacement home. Do not treat the three-year mark as a comfortable deadline — treat it as a hard wall you should never approach.

A Worked Example: Using Two of Three Transfers Over a Lifetime

Here is how the lifetime count and the two-year window work in practice. A 58-year-old Sacramento homeowner used one transfer in 2022 when she moved to a smaller home in Placer County. She has two transfers remaining.

At age 64, she decides to move again — this time to Sonoma County, closer to her daughter. She sells her Placer County home in March 2026 and buys in Sonoma County in October 2026, within the two-year window. Because she buys within the first year after selling, she gets the 5 percent timing cushion on the value comparison. She files her BOE-19-B claim with the Sonoma County assessor within three months of closing. Her claim is processed retroactively to closing. This is her second transfer. One remains.

If she moves again after 65, she will have one transfer left to use. When that third transfer is complete, the benefit is exhausted for her — though her spouse, if also on title, still has his own count.

Chapter 5 of Prop 19 Hero covers every variation of these rules, including what happens when a transfer doesn't qualify because the window was missed, and how to track your count if you've moved before.

Summary

• Proposition 19 allows intercounty transfers — your replacement home can be in any of California's 58 counties.

• If you qualify by age or disability, you may transfer up to three times in your lifetime. The count is per person, not per household.

• Disaster victims are not subject to the same three-lifetime cap — the benefit can apply once per qualifying disaster.

• The sale of the original home and the purchase of the replacement must both fall within a two-year window, in either order.

• File within three years of the replacement purchase for retroactive relief; filing after three years gives only prospective relief and forfeits the waiting period.

• Plan around all three rules before you move: confirm the county is acceptable, track your transfer count, and map your sale and purchase dates against the two-year window.

Get the Full Picture

Read the book. Prop 19 Hero walks through every portability rule in detail — what happens when the window is tight, how to track your lifetime count, and how filing timing affects your benefit. Find it on Amazon.

Talk to Bart. If you own a home in Sacramento and want to plan a move that protects your low tax base, Bart Hubbard can walk you through the rules before you list. Reach out at Prop19Hero.com.

About the Author

Bart Hubbard is a California real estate associate at HomeSmart ICARE Realty (DRE #01815497) and a C.A.R. Certified Probate & Trust Specialist. He wrote Prop 19 Hero to give California homeowners 55 and older a clear, practical guide to the property tax rules that affect every move they make. He works with buyers and sellers throughout the Sacramento area. Reach him at [email protected] or www.prop19hero.com.