California Prop 19: How to Move Without Losing Your Property Tax Base

Plenty of California homeowners want to move and do not. They bought decades ago, Proposition 13 has held their assessed value far below market, and a new purchase means a reassessment at today's price. The tax increase alone can make a smaller, more suitable home cost more per month than the house they already own.

Proposition 19 is the rule that addresses this — and a lot of homeowners still do not know how much it changed.

Key takeaways

• Qualifying homeowners can transfer their base year value to a replacement principal residence.
• It applies to homeowners 55 or older, the severely disabled, and victims of wildfire or natural disaster.
• The replacement home can be anywhere in California — the old same-county restriction is gone.
• It can be used up to three times (the prior law generally allowed once).
• The replacement must be bought or newly built within two years of the sale.
• Prop 19 is implemented by Revenue and Taxation Code section 69.6 and took effect April 1, 2021.

What a base year value transfer actually does

Under Proposition 13, your property is assessed at its value when you bought it, with limited annual increases, until there is a change in ownership. Buy a new home and the clock resets at the new purchase price.

A base year value transfer lets you carry the old assessed value with you to the replacement home instead of being reassessed at full market value. Your new home is taxed roughly as though it were your old one.

If you are unfamiliar with how a reassessment shows up after closing, our guide to the California supplemental property tax bill covers the mechanics of what happens when a property is reassessed.

Who qualifies

Three groups, under Revenue and Taxation Code section 69.6:

• Homeowners who are at least 55 years old
• Homeowners who are severely disabled
• Victims of a wildfire, as defined, or a natural disaster as declared by the Governor

The property being sold and the property being bought must both be a principal residence. This is not a rule for second homes or rentals.

What changed from the old law

Prop 19 replaced Propositions 60, 90, and 110 (Revenue and Taxation Code section 69.5). The differences are substantial:

The two changes that matter most in practice are location and frequency. Under the old rules, a homeowner in a county without a reciprocal ordinance simply could not move and keep their base. Now the entire state is open.

The "equal or lesser value" test, and what happens above it

Prop 19 does not require the replacement home to be cheaper. It allows any value — but if the replacement costs more, the excess is added to the transferred base.

There is no adjustment to the transferred base year value if the replacement is of equal or lesser value than the original property's market value. "Equal or lesser value" is defined by timing:

• 100% if the replacement is purchased or newly constructed before the sale of the original
• 105% if purchased or newly constructed in the first year after the sale
• 110% if purchased or newly constructed in the second year after the sale

If you exceed that threshold, the amount above it is added to the transferred value. You do not lose the benefit — you keep your old base plus the difference.

That structure rewards moving sooner. Waiting into year two gives you a slightly higher allowance, but the two-year clock is the outer limit either way.

The timing rule

You must purchase or newly construct the replacement residence within two years of the sale of the original. Building counts, not just buying — but the two-year window applies to completion of the new construction, so a long build is a real risk to the benefit.

Why this matters for your financing

Two practical consequences.

Your payment estimate changes. If you qualify and file successfully, the property tax component of your new payment is based on the transferred base, not the purchase price. A standard payment estimate that assumes taxes at roughly the purchase price will overstate your true payment — sometimes by a lot. Ask for an estimate that reflects the transferred base, and be clear with your loan officer that you intend to claim it.

Sequencing affects both the tax and the loan. Buying before you sell gets you the 100% threshold, but it means qualifying while still carrying the first mortgage. Selling first is cleaner for qualifying but starts the clock. There is no universally right answer — it depends on your equity, your income, and whether bridge financing is realistic for you. That is worth modeling with a loan officer before you list.

You can compare structures on our conventional, jumbo, and bridge loan pages, and run scenarios with our calculators.

Filing is on you

A base year value transfer is not automatic. You claim it with the county assessor in the county where the replacement home is located, and the claim has its own form and deadlines. County assessor offices publish the forms and their filing requirements, and the Board of Equalization maintains a Proposition 19 filing requirements checklist.

Do not assume escrow handled it. Do not assume the assessor will apply it because you obviously qualify. File.

Related California resources

For county-level financing limits, see our California loan limits guide. Buyers weighing conforming against jumbo financing in high-cost counties may want our Bay Area conforming vs. jumbo guide.

Local pages: Sacramento, Los Angeles, San Diego, Orange County, and the SF Bay Area.

To model a move with the transferred base built into the numbers, browse our loan officer directory or get started.

Frequently Asked Questions About California Prop 19 Property Tax Transfer

How many times can I use a Prop 19 base year value transfer?

Up to three times for homeowners who are at least 55 or severely disabled. The prior law under Propositions 60, 90, and 110 generally allowed one transfer, with a narrow exception for a subsequent disability.

Can I move anywhere in California and keep my property tax base?

Yes. Proposition 19 allows the replacement principal residence to be located anywhere in California. Under the old law the replacement generally had to be in the same county, or in one of the ten counties that had adopted an intercounty ordinance.

Does my new home have to cost less than my old one?

No. Prop 19 allows a replacement of any value. If the replacement exceeds the equal-or-lesser-value threshold, the amount above it is added to the transferred base year value, so you keep the benefit on the portion below the threshold.

What counts as equal or lesser value under Prop 19?

100% of the original property's market value if the replacement is purchased or newly constructed before the sale, 105% if in the first year after the sale, and 110% if in the second year after the sale.

How long do I have to buy the replacement home?

You must purchase or newly construct the replacement residence within two years of selling the original property.

Sources

• California State Board of Equalization — Proposition 19 base year value transfer comparison charts
• California Revenue and Taxation Code section 69.6 (implements Proposition 19); section 69.5 (former Propositions 60/90/110)

This article is for general information only and is not legal, tax, or financial advice. State law and investor guidelines change; confirm current requirements with a licensed professional before making decisions. Xpert Home Lending, Inc. is an Equal Housing Lender.