Almost every buyer asks some version of "what will my property taxes actually be?" at some point in the process. The honest answer involves two different laws, Prop 13 and Prop 19, that together control how your tax bill gets set and what happens to it over time.
The short version
When you buy a home in California, your property is reassessed at the purchase price, and that becomes your new "base year value." Under Prop 13, your assessed value then can't increase by more than 2% per year, regardless of how much the home's market value actually goes up. That's the whole system in a sentence: taxed on what you paid, adjusted slowly, not on what the home is worth today.
How Prop 13 actually works
Property tax in California is generally about 1% of assessed value, plus any local voter-approved bonds and assessments, which is why actual rates vary a bit by city. The part that surprises people is the 2% annual cap. If you buy a home for $1.2 million, your first year's assessed value is $1.2 million. The next year it can rise to $1,224,000 at most, not to whatever the home's market value has climbed to. Over 10 or 20 years, this gap between assessed value and market value can get substantial, which is exactly why long-time owners often have dramatically lower tax bills than their neighbors who bought more recently.
What triggers a reassessment
The most common trigger is simply buying a home, at which point it's reassessed at the new purchase price. New construction or major improvements can also trigger a partial reassessment on the improved portion. A change in ownership, like adding someone to title in some circumstances, can trigger it too, though there are specific exclusions (like transfers between spouses) that don't.
What Prop 19 changed
Prop 19, passed in 2020, made two significant changes. First, it expanded the ability for homeowners 55 and older, severely disabled homeowners, or wildfire and disaster victims to transfer their existing tax base to a new home anywhere in California, up to three times, even if the new home costs more (with an adjustment upward for the price difference). Before Prop 19, this transfer was more geographically limited.
Second, and this is the part that generates the most questions, Prop 19 significantly narrowed the parent-to-child exclusion. Previously, a parent could pass a home to a child and the child could keep the parent's low assessed value, whether or not they moved in. Now, the child generally has to make the home their primary residence within a year to get any exclusion at all, and even then, if the home's current market value exceeds the parent's assessed value by more than $1 million, the assessment gets partially adjusted upward. Investment or vacation properties inherited from a parent no longer get the old tax base carried over.
What this means if you're inheriting a family home
If a home is coming to you from a parent, timing and intent matter more than they used to. Moving in within the required window and filing the right paperwork with the county assessor is what preserves any benefit at all. This is genuinely a case where talking to a property tax specialist or estate attorney before making a decision is worth it, since the numbers involved can be significant and the rules have real deadlines attached.
What I'd actually tell you
For most buyers, the practical takeaway is simple: budget property taxes based on your purchase price, not based on what the current owner has been paying, since your bill resets to reflect what you paid. If you're 55 or older and thinking about your next move, or you're navigating an inherited property, the rules are specific enough that it's worth a real conversation rather than assuming how the general rule applies to your exact situation.
