Since February 16, 2021, an inherited California home is generally reassessed to market value unless the child moves in as their primary residence and claims the homeowners’ exemption. Two separate one-year clocks run on that, and the consequences of missing them are not remotely alike.
This site stated the hard version and then described the soft consequence in the following sentence — on two pages, until a review caught it. It is an easy conflation to make, and an expensive one to rely on.
Clock one: occupancy. Hard gate, no relief.
The child must occupy the property as their principal residence within one year. This is an eligibility requirement. Miss it and the exclusion is simply not available — there is no late filing, no good-cause relief, no partial credit.
Property Tax Rule 462.520, Example 16 is unambiguous about this: a child who moves in at fifteen months is ineligible. Not reduced. Ineligible. The home is reassessed to full market value.
Clock two: the exemption filing. Soft, and recoverable.
The homeowners’ exemption (BOE-266) or the disabled veterans’ exemption (BOE-261-G) must also be in place. But filing that late costs retroactivity, not eligibility. You lose some back-dating of the benefit. You do not lose the exclusion.
So: move in late and you have lost everything. File late and you have lost some months. Anyone describing these as “the one-year deadline” has merged a cliff with a slope.
The cap, and how it actually computes
Even when you qualify, the exclusion is capped. For transfers dated February 16, 2025 through February 15, 2027, the cap is the factored base year value plus $1,044,586. It was $1,000,000 originally, then $1,022,600, and it re-indexes on February 16, 2027 — the Board typically publishes the new figure about three weeks late.
A citation detail that matters if you go looking: R&TC §63.2 is the exclusion, but it still reads a flat “$1,000,000” and contains no adjustment provision. The indexing authority is Cal. Const. art. XIII A, §2.1(c)(4), which directs the Board to adjust the figure every other February 16 by the change in the FHFA House Price Index for California. If you cite §63.2 for the $1,044,586, you will not find it there.
The arithmetic runs in three steps. The excluded amount is the factored base year value plus the cap. The excess is the market value minus that excluded amount, floored at zero. The new taxable value is the factored base year value plus the excess.
The Board’s published illustration uses a factored base year value of $300,000 and a market value of $1,500,000, and arrives at $500,000. But note: that illustration uses the older $1,000,000 allowance. Run the same facts at today’s $1,044,586 and the answer is $455,414. If you are quoting a number from a BOE example, say which allowance it assumes.
And it is a cap, not a cliff. Going over it does not destroy the exclusion; it adds the excess to your base.
Renting it out ends the conversation
An inherited home kept as a rental is fully reassessed. There is no partial treatment, no grace period for a year of tenancy while the family decides. The exclusion is for a child occupying the home as their principal residence, and nothing else qualifies.
This is the single biggest practical change Proposition 19 made. The old default — keep the house, rent it, enjoy Mom’s 1978 tax base — no longer exists.
The form, and when it is due
You file BOE-19-P for a parent-to-child transfer, or BOE-19-G for grandparent-to-grandchild. It is due at the earliest of: within three years of the transfer, before the property is transferred to a third party, or when an eligible transferee stops occupying it.
For transfers dated before February 16, 2021, the predecessor rules under §63.1 — Propositions 58 and 193 — apply instead, and they are considerably more generous. Date of death is the date of transfer, so which regime applies is fixed by a date nobody chose.
New for 2026: a third clock, and this one is short
SB 293 (Stats. 2025, ch. 539) amended §63.2 effective January 1, 2026, and added a filing trap that did not exist before. If the county assessor sends you written notice that you may be eligible for the exclusion, you must file a certified claim within 45 days. Miss that, and a second notice gives you 60 days. Miss that too, and the county may charge a processing fee of up to $175 — even if your claim is otherwise perfectly good and ultimately granted.
This is new, it is procedural, and it is easy to lose in a stack of county mail during a month when someone has just died. Open anything from the assessor. Forty-five days is not long.
The same bill added relief in the other direction for property damaged in the 2025 Palisades, Eaton, Hurst, Lidia, Sunset or Woodley fires — up to three years from a notice of supplemental or escape assessment, for claims filed before January 1, 2031.
If you are weighing whether the tax base is worth the occupancy requirement at all, that trade-off — step-up in basis against the one-year gate — is exactly what the sell-or-inherit comparison is built to model.