Proposition 19, for people who've owned a long time

Here is the situation Proposition 13 creates. You bought in 1991. Your assessed value has been allowed to rise at most 2% a year ever since, so your property tax bill bears no relationship to what your house is worth today. It is, in the language people actually use, absurdly low — and it is the reason a lot of people who want to move don't.

Because the moment you buy a replacement home, it is assessed at its market value. Same house size, same neighbourhood, and your property tax could multiply several times over. For a household on a fixed income, that is often the thing that makes the move impossible.

Proposition 19 is the answer to exactly that problem.

What it does

If you qualify, you can transfer the taxable base year value of your current home to a replacement primary residence. Not the price — the assessed value your tax bill is calculated from. The low one.

The core provisions, in plain terms:

If the replacement home is of equal or lesser value than what you sold, the base transfers across essentially intact. If it is more valuable, you don't lose the benefit — the difference in value is added to your transferred base. So moving up still works; you simply pay on the increment rather than on the whole thing.

That last point matters more than any other, and it is the one people get wrong. Under the older rules this was far more restrictive. Prop 19 opened it up.

Why it changes the conversation

Take a longtime owner whose assessed value is a fraction of today's market value. Moving without Prop 19 could add many thousands of dollars a year to their property tax, permanently. Moving with it can hold that cost close to where it already is.

That difference decides whether people can downsize, move nearer their children, or move somewhere with less house to maintain. I have sat with sellers who had assumed for a decade that they were stuck.

What to do about it, in order

1. Check eligibility before you list. Not after. Sequence and timing carry real consequences and some of them are not fixable retroactively.
2. Talk to the County Assessor. They administer the claim and they will talk to you. This is free, and they are the authority — not me, and not any website.
3. Talk to a CPA if there's a capital gains question alongside it, which for a long-held property there usually is.
4. Then we plan the sale and the purchase around what you've learned.

The other half of Prop 19

Prop 19 also changed the parent-to-child rules, and it tightened them substantially. Inherited property generally now keeps the parent's tax base only where the child uses it as their own principal residence, and there is a cap on the benefit.

If your plan involves leaving a house to your children, or you have inherited one, the rules that applied to your parents' generation may not apply to yours. That is a conversation with an estate attorney, and it is worth having before it becomes urgent.

Where to verify all of this

• California State Board of Equalization — Proposition 19

  The state's own guidance, including the base year value transfer rules and the parent-child provisions.

• San Diego County Assessor

  Who actually processes your claim, and who can tell you your current assessed value.

• Treasurer–Tax Collector — your current bill

  Start here. Your assessed value is on it, and it's the number the whole calculation turns on.