Prop 19 for San Diego Sellers Over 55: How to Take Your Property Tax Base With You

Let me put a number on this.

I sat with a couple in Kensington last year. They bought in 1994. Their home was worth about $1.35 million and their annual property tax bill was under $2,500, because California assesses on what you paid, not on what it's worth.

They wanted to downsize. Something single-level, closer to the water, easier to look after. And they weren't going to do it, because they were certain the tax bill on a new place would be four figures a month.

They were wrong, and it cost them two years of living in a house with stairs they'd stopped using.

Here's what they didn't know.

Why the gap exists in the first place

Proposition 13 caps how fast your assessed value can rise. Roughly two percent a year, regardless of what the market does. Buy in San Diego in the nineties and hold, and by now your assessed value and your market value live in different universes.

That's fantastic while you stay. It becomes a cage the moment you think about moving, because a new purchase gets assessed at the new price. Long-time owners end up locked into homes that no longer suit them, purely by tax arithmetic.

Proposition 19, which took effect on April 1, 2021, is the release valve.

What Prop 19 actually gives you

If you're 55 or older, you can transfer the assessed value from your current primary residence to a replacement primary residence.

Three things about it are much better than most people realise, because most people are remembering the old rules.

You can move anywhere in California. All 58 counties. The old law limited you to your own county, or to a short list of counties that had opted in.

The replacement home can be any value. There is no price ceiling.You get three of these in your lifetime. The old law gave you one.

The 105 percent myth

If you go looking online you will find article after article saying your replacement home has to be worth no more than 105 percent, or 110 percent, of what you sold.

That was Propositions 60 and 90. It is not the current law and hasn't been since 2021.

I raise it because those articles still rank well, and I have had sellers talk themselves out of moving based on a rule that was repealed years ago. Under Prop 19 you can absolutely buy something more expensive. You just don't get the whole benefit. You get a proportional one, and that's the part worth understanding properly.

Rule one: buying equal or cheaper

If your replacement home costs the same as or less than what you sold for, your assessed value transfers straight across. Unchanged.

My Kensington couple sells at $1.35 million. They buy a single-level place in La Mesa for $1.15 million. Their assessed value, call it $210,000 after decades of Prop 13 increases, follows them to La Mesa.

Their tax bill stays around $2,400 a year on a home they just bought for $1.15 million. Without Prop 19 it would have been roughly $13,000.

Rule two: buying more expensive

This is where the formula comes in, and it's simpler than it looks.

New assessed value = old assessed value + (new purchase price - old sale price)

You only get taxed at the full market rate on the step up. Everything below your old sale price keeps its protected assessment.

Same couple, different ending. They sell Kensington at $1.35 million and buy a Del Mar condo at $1.6 million.

Old assessed value: $210,000. The difference between the two properties: $250,000. Newassessed value: $460,000.

At a San Diego County rate of roughly 1.15 percent, and yours will vary with local bonds and special assessments, that's about $5,300 a year on a $1.6 million condo. Assessed fresh, it would have been about $18,400.

They upsized in price, moved to the coast, and still saved around thirteen thousand dollars a year.

The timing rule

You have two years. The sale of the old home and the purchase of the new one have to fall within two years of each other.

The order doesn't matter. You can buy first and sell after, or sell first and buy after. Either works, as long as both happen inside the two-year window. That flexibility matters a lot in practice, because buying before you sell is how most people actually want to move.

The filing rule, which is different

The two-year window is about the transactions. Filing the claim is a separate deadline, and people conflate the two constantly.

You file form BOE-19-B with the San Diego County Assessor. You have three years from the date you buy the replacement home to file and have the full benefit applied retroactively.

Miss the three years and you don't lose the relief entirely, but you lose the back end. Relief starts from the year you file, and there are no refunds for the years you sat on it.

Nobody sends you a reminder. This does not happen automatically just because you're over 55 and the county can see both transactions on its own records. You have to file the form.

Who actually qualifies

You need to be 55 or older at the time you sell the original home. If you're married, only one of you needs to hit the age.

Both properties have to be your principal residence. The one you sold, and the one you bought.

You have to have been both an owner and an occupant, and you need to be eligible for the homeowners' exemption or the disabled veterans' exemption on both properties.

Some things people try that don't work: transferring the base from a rental, a holiday home, or an investment property. Transferring it to a child. Transferring it to a property outside California. None of those fall within Prop 19.

A word on the other half of Prop 19

Prop 19 gave seniors more. It took a great deal away from inherited property.

Before 2021, a parent could pass a property to a child and the child inherited the low assessment, whether they lived in it or rented it out. Now the exclusion only applies if the child makes it their own principal residence, and even then it's capped. The protection runs out above roughly a million dollars of value over the parent's assessed value, and the excess gets reassessed.

That change reshaped a lot of San Diego family planning, and it's a bigger topic than one paragraph. But if you're 55 and thinking about both moving and what eventually happens to the family home, know that the two halves of this law pull in opposite directions, and it deserves proper advice.

The mistakes I see

Assuming the old value cap still applies, and not moving because of it.

Waiting for the assessor to apply the benefit automatically. It doesn't.

Blowing the two-year window by a few weeks on a deal that fell through, without realising the clock had been running the whole time.

Not accounting for the difference in the new tax bill on a step-up purchase. The blended number is much lower, but it isn't the old number.

The point

If you've owned a San Diego home for a couple of decades and you've been staying put because of the tax bill, that reason may not hold anymore. Three moves, anywhere in the state, at any price, with your assessment coming with you in whole or in part.

Run your actual numbers before you decide. The gap between what people assume Prop 19 does and what it actually does is, in most of the cases I see, worth about ten thousand dollars a year.

I'm a Realtor, not a tax adviser, and your situation deserves a look from your CPA or from the San Diego County Assessor's office before you act on any of it. But it's absolutely worth the phone call.