Proposition 19 and the Payment on Your Next Home
Program and regulatory figures verified September 17, 2026. Details change; confirm your scenario with us.
This is a tax rule, so why is a lender explaining it? Because property tax sits inside the payment we underwrite, and on a long-held California home the difference is not marginal.
What actually transfers
Not your purchase price and not your tax bill. What moves is the factored base year value, which the Board of Equalization defines as the base year value plus inflationary adjustments. On a California home held for decades that figure can sit far below what the house would sell for today, and Proposition 19 lets an eligible owner carry it to the replacement rather than being reassessed at the new purchase price.
The authority is Article XIII A, Section 2.1(b) and (e) of the California Constitution, implemented at Revenue and Taxation Code Section 69.6, operative April 1, 2021.
The 105 and 110 percent windows
The Board of Equalization states the rule plainly: there is no limit to the market value of the replacement property compared to the original, but the amount in excess of the original property's market value is added to the transferred value. The replacement's market value can exceed the original's by up to 105 percent if the replacement is purchased within the first year after the sale of the original, or 110 percent in the second year, with no excess added.
Read that twice, because the common misreading is costly. It is not a cap on what you may buy. It is a threshold past which the extra shows up in your assessment permanently.
Why a lender cares about any of this
Because property taxes are inside the housing payment underwriting measures, and therefore inside your debt ratio. Two California buyers purchasing identical houses at the same price can carry very different payments depending on whether a base year value transferred. One qualifies comfortably; the other does not. That is not a tax footnote, it is the approval.
It also means the honest answer to "should I buy first or sell first?" in California is sometimes different from the answer in any other state, and it depends on numbers rather than on preference.
Who qualifies
- Age 55 or older at the time the original property is sold, or severely and permanently disabled at any age.
- Both the original and the replacement must be eligible for the homeowners' or disabled veterans' exemption.
- The claimant must own and reside in the original at the time of sale, or within two years of the purchase or completion of the replacement.
- Either the sale or the purchase must have occurred on or after April 1, 2021.
One thing we are careful about
We do not determine your assessment and we do not file your claim. Your county assessor does the first and you or your tax professional do the second. What we do is take the outcome seriously when modelling the payment, rather than plugging in a percentage of purchase price and hoping.
Run your own numbers on the Proposition 19 window calculator, then see which financing structure fits.
Proposition 19 eligibility and landlord notice requirements are legal and tax questions. Your CPA, a California attorney, and your county assessor own those answers. We flag them because they change the numbers we underwrite.
Frequently asked questions
What is a factored base year value?
The Board of Equalization defines taxable value as the base year value plus inflationary adjustments, commonly called the factored base year value. It is the figure your assessment is built on, and on a long-held California property it is usually far below current market value. Proposition 19 lets an eligible owner carry it to a replacement home.
Is there a limit on what I can buy under Proposition 19?
No price cap. There is a threshold: the replacement's market value may exceed the original's by up to 105% if purchased within the first year after the sale, or 110% in the second year, with nothing added to the transferred value. Above that you may still buy, but the amount in excess of the original's market value is added to the transferred value and stays there.
How long do I have to buy the replacement home?
The replacement must be purchased or newly constructed within two years of the sale of the original property. The 105% and 110% thresholds sit inside that window, measured from the sale.
Do I have to be 55 when I buy the new house?
The requirement is age 55 or older at the time the original property is sold, or severely and permanently disabled at any age. The timing that matters is the sale of the original, not the purchase of the replacement.
Does Proposition 19 change what I qualify for on a mortgage?
Indirectly but significantly. Property taxes are part of the housing payment underwriting measures, so a transferred base year value can lower the payment used in your debt ratio compared with an assessment at full purchase price. Two buyers at the same price can qualify differently because of it.
Mike Certo · NMLS #260555 · Cornerstone First Mortgage NMLS #173855 · Equal Housing Lender. Educational content about financing, not a loan commitment and not legal, tax, or real estate advice. Proposition 19 eligibility, assessment practice, and landlord-tenant rules change and depend on your facts; your county assessor, your CPA or a California attorney, and your real estate agent each handle their own part. Loans are subject to borrower and property qualification.