How California's Prop 13 Property Tax Cap Works - and What Prop 19 Changed for Inherited Homes
How does Prop 13 limit property taxes in California?
Proposition 13 caps the base property tax rate at 1% of a home's assessed value and limits annual increases in that assessed value to no more than 2%, regardless of what the real estate market does. When a home is sold, the assessed value resets to the purchase price, and the 2% annual cap starts over from that new base.
Does California reassess property taxes when you inherit a home?
Under Proposition 19, which took effect in February 2021, inheriting a home from a parent generally triggers a full reassessment at current market value unless you move into the home as your primary residence within one year. Even then, a partial reassessment applies if the market value exceeds the parent's assessed value by more than $1 million.
Can I transfer my Prop 13 tax base to a new home in California?
California homeowners 55 or older, those with severe disabilities, or victims of a declared disaster can transfer their existing Prop 13 assessed value to a replacement home anywhere in the state, under rules Prop 19 expanded statewide. The transfer can be used once. If the new home costs more than the original, the difference is added to the transferred base. Check current rules with the California State Board of Equalization at boe.ca.gov.
What triggers a property tax reassessment in California?
Most changes of ownership trigger a reassessment to current market value, including sales, gifts, and certain other transfers. Some transfers are excluded, including those between spouses and transfers into a revocable living trust where the original owner remains the beneficiary. New construction or major permitted improvements can also trigger a partial reassessment limited to the value added.
What is a Mello-Roos tax and how does it affect my California property tax bill?
A Mello-Roos tax is a special assessment levied on properties within a Community Facilities District, typically formed to fund infrastructure like roads, schools, or utilities in newer developments. It's separate from the 1% Prop 13 base rate and can add several hundred to several thousand dollars annually to a property tax bill. The amount varies by district and is disclosed during a home purchase.
California property taxes work nothing like what most new homeowners expect. The bill you pay isn't tied to your home's current market value - it's tied to what you paid for it, with a strict annual cap on how fast that taxable value can grow. Understanding that distinction, and the rules that govern what happens when a property changes hands, can mean tens of thousands of dollars in savings or surprise costs depending on your situation.
Related: How Prop 19 Changed Inherited Property Taxes in California - and What Heirs Need to Know · How California's Prop 19 Inheritance Rules Work - and What Homeowners Need to Do to Protect the Tax Break
The Prop 13 Baseline: What Actually Gets Taxed
Proposition 13, passed by California voters in 1978, set two foundational rules that still govern property taxes in the state today. First, the base property tax rate is capped at 1% of a property's assessed value - though local bonds and special assessments can push the effective rate somewhat higher, typically to somewhere between 1.1% and 1.5% depending on the county and school district. Second, and more consequentially for long-term owners, the assessed value of a property can increase no more than 2% per year, regardless of what the actual real estate market does.
When you buy a home, the county assessor resets your property's assessed value to your purchase price. That becomes your new base year value. From that point forward, the 2% annual cap applies. If you bought a home in 2024 for $800,000 and property values in your neighborhood doubled over the next decade, your assessed value for tax purposes would still only reflect roughly the original $800,000 compounded at 2% annually - not the market value. That's the core protection Prop 13 provides.
New construction or significant unpermitted improvements can trigger a partial reassessment. The county assessor adds the value of the new construction to your existing base year value, but the rest of the property isn't reassessed. Routine repairs and maintenance generally don't trigger any reassessment.
When a Property Changes Hands: Reassessment Rules
Any change of ownership - a sale, a gift, or certain other transfers - typically triggers a full reassessment at current market value. That's what resets the clock for a new buyer and is why a neighbor who bought the same model house in 1995 might pay a fraction of your property tax bill on paper-identical homes.
Some transfers are excluded from reassessment. Transfers between spouses generally qualify for a full exclusion. Transfers to a revocable living trust where the original owner remains the beneficial owner also typically don't trigger reassessment. The California State Board of Equalization and your county assessor's office maintain current lists of qualifying exclusions - it's worth confirming your specific situation with the assessor before assuming a transfer is excluded.
What Prop 19 Changed for Inherited Property
This is where a lot of families get caught off guard. Before Proposition 19 took effect in February 2021, California allowed parents to transfer a primary residence to their children - and up to $1 million of assessed value in other real property - without triggering a reassessment. That exclusion was broad enough that a family beach house or rental property could pass between generations with the low Prop 13 tax base intact.
Prop 19 significantly narrowed those rules. Under the current framework, a parent-to-child (or grandparent-to-grandchild, in certain cases) transfer of a primary residence still qualifies for a partial exclusion, but only if the child actually moves into the home and uses it as their primary residence within one year of the transfer. And even then, the exclusion has a cap: if the home's current market value exceeds the parent's assessed value by more than $1 million, the portion above that threshold gets added to the assessed base. A home with a $200,000 assessed value that's now worth $2 million, for example, would result in the child being taxed on $800,000 of assessed value - not the original $200,000, but also not the full market value.
For any inherited property the child doesn't move into - a vacation home, a rental, a second house - there is no longer a parent-to-child exclusion under Prop 19. Those transfers trigger a full reassessment at current market value, which in many California markets means a dramatic increase in annual property taxes. That's a significant change for families that had planned to pass income-producing property to the next generation under the older rules.
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Prop 19 also expanded a separate benefit: California homeowners 55 and older, people with severe disabilities, or victims of a declared disaster can now transfer their existing Prop 13 assessed value when they buy a replacement home anywhere in the state. Previously, that portability was limited to a handful of counties and to buying a home of equal or lesser value. The current rules allow one such transfer, and the replacement home can be of any value - though if it costs more than the original, the difference gets added to the assessed base. The California State Board of Equalization's current guidelines govern the exact mechanics, and your county assessor processes the claim.
How to Figure Out Where You Stand
If you're buying a home, your property tax bill starts from your purchase price. Contact your county assessor's office to confirm the current local tax rate and any supplemental assessments that apply in your area - school bonds, special districts, and Mello-Roos fees can vary significantly by location and won't appear in the base 1% rate.
If you're inheriting a home or receiving one as a gift, the timing and how you use the property matter enormously under Prop 19. Before completing any transfer, it's worth consulting with a California-licensed estate attorney or CPA who handles real property, because the window to qualify for the exclusion is strict and the tax consequences of missing it are permanent. Your county assessor's office can also explain what documentation they require and the deadline for filing a claim for exclusion after a transfer occurs - these vary somewhat by county but are generally tied to the date of transfer.
If you think your property has been over-assessed - meaning the assessor's stated value is higher than what your home would actually sell for on the open market - California law gives you the right to appeal. That process was covered in a separate CALWIRE explainer.
This is general information, not legal or financial advice. Property tax rules, exclusion eligibility, and local assessment practices can change, and the specifics vary significantly by county. Verify current rules with the California State Board of Equalization at boe.ca.gov and your county assessor's office directly.