Market Value vs Assessed Value in California

A lot of sellers anchor to the wrong number when thinking about what their house is worth. The number on your property tax statement is the assessed value, and in California it can be a long way from what a buyer would pay, especially for anyone who’s owned more than ten years.

I see it come up constantly with sellers who’ve held their property for a decade or more. Sellers who go in anchored to the tax bill number end up making decisions around a figure that has nothing to do with what buyers are paying.

What Assessed Value Is in California (and Why It Falls So Far Behind)

How Prop 13 Works

The county locks in your assessed value at whatever you paid when you bought, and under Proposition 13 it can only move up 2% a year after that. California passed Prop 13 back in 1978, and that 2% ceiling is basically how California property taxes have worked for long-term owners ever since.

An owner who bought in 1999 for $185,000 has an assessed value somewhere around $290,000 today, in most of the markets I work in. Houses on that same street are probably selling for $620,000 or more.

The county number is built for the tax bill, and most owners know this on some level but don’t always follow through on what it means when they’re trying to price a sale. Prop 13 was designed to keep long-term owners from being priced out of their own homes every time the market runs up.

The assessor’s office runs a formula against the purchase price and adjusts 2% annually, and that base number only resets when the property sells or when permits get pulled for significant work. An owner who’s held the same place for fifteen or twenty years without either of those things happening ends up with two completely different numbers that don’t have much to do with each other.

Prop 13 was written to keep the tax bill from tracking the market, and that design is pretty much working as intended. The long-term owners who’ve held in appreciating neighborhoods for decades have benefited a lot from it, and the sellers who run into trouble are the ones who start confusing which number is relevant when they’re thinking about selling.

Prop 19 and Parent-to-Child Transfers

Prop 19 changed the rules on parent-to-child transfers starting in February 2021, and a lot of heirs I’ve talked to since then didn’t see it coming. Before it passed, a child could inherit any California property and keep the parent’s assessed value regardless of what they planned to do with it.

Under Prop 19, the child has to move in within a year and use it as their primary residence to preserve the Prop 13 base. If they’re planning to rent it out or sell it, the county reassesses at market value the day title transfers.

There’s also a $1 million cap on the protection, even for primary residences. Say a parent’s assessed value is $300,000 and the market value is $1.8 million.

Only $1 million of that $1.5 million gap gets shielded, so the new assessed value would land around $800,000.

Heirs who inherited a rental property thinking the low tax bill would carry over have ended up with a significantly different number than they expected. It usually changes how they’re thinking about the property once the actual bill is on the table.

What Market Value Means

How Market Value Gets Established

I spent seven years doing residential appraisals before getting into acquisitions, and the starting point on every value question was the same. The reference points are closed sales nearby in similar condition, and what matters is what those buyers paid in the last three to six months.

Zillow gives you a rough directional read but lenders don’t use it and neither do agents when they’re working up an offer. The number that drives what buyers pay is what similar houses have closed at in the last few months, and that’s the figure I’m building off of when I walk a property.

Why It Moves Around

The market number tracks interest rates and inventory and both of those can shift the price range on a property pretty quickly. I’ve watched that range move enough inside of six months that the closed sales I’m pulling need to be from the last three to six months to mean anything.

By comparison the assessed value is basically fixed, and those two numbers can end up really far apart if you’ve owned the place a long time. I’ve worked with sellers in Riverside who bought in 2003 and had an assessed value less than half of what the market was showing.

How Wide the Gap Gets in Southern California

We work with a lot of long-term owners and the gap between what the county says a house is worth and what the market will pay can be pretty significant. Someone who bought in Riverside or San Bernardino in the early 2000s at $200,000 might have an assessed value around $300,000 now and a home that would sell for $580,000.

If you go into a sale anchored to the wrong number you can make some really bad decisions.

Montana Street, Quail Valley

I see this pretty regularly across all five counties we work in. In May 2021 we closed on a house on Montana Street in Quail Valley, Riverside County, we paid $155,000.

The property had been vacant a while, there were some condition issues and the seller’s sense of what it was worth wasn’t really tracking what similar places in that area had been closing at.

When Both Numbers Miss

I run into this regularly, sellers who’ve held a long time and haven’t looked at what nearby places have closed at in a while.

I’ve talked to sellers who wanted way more than the market would support, anchored to a Zillow estimate that hadn’t moved in a year.

And I’ve talked to sellers who thought their place was worth whatever the tax bill implied.

Both of those numbers are sort of beside the point when you’re trying to sell, and I’ve had to walk a few of those sellers back to what the market was doing before we could have a real conversation.

When Each Number Comes Up

Your Tax Bill

If you’re trying to figure out your tax bill, assessed value is what you need to look at. The county applies a rate to it, starting at 1% under Prop 13 and typically landing at 1.1 to 1.25% all-in once local bonds and special assessments are factored in, and that’s your annual bill.

Those special assessments usually mean Mello-Roos, and in Southern California new construction that number can push the effective rate well past 1.25%. A property with an active CFD in the Inland Empire can run 1.5% to 1.8% all-in on the tax bill, and buyers who haven’t built that into their payment math sometimes get surprised mid-escrow when the lender’s impound estimate arrives.

The assessed value is basically only relevant for the tax bill. If you think it’s running too high relative to what your place would sell for, most California counties open an appeal window from July 2 to November 30.

Appealing Your Assessment

The appeal goes to the Assessment Appeals Board, which is separate from the assessor’s office. The board wants a recent appraisal dated as close to January 1 as possible, and the closer it is to the lien date the stronger the case.

If the board sustains it, the county adjusts your assessment and typically issues a refund for the current year. Most long-term California owners are already assessed well below market, so an appeal usually doesn’t apply, but after a significant price drop in the area it can change the math.

When You’re Selling or Refinancing

The assessed value doesn’t come up when you’re selling or refinancing. A lender ordering a refinance appraisal is establishing market value off what nearby houses have closed at, not looking at the county’s number.

Buyers are going off closed sales when they’re making offers, not the county number. In over 400 transactions I’ve never had someone bring the assessed value into a price negotiation.

The only time those two numbers line up is right when you sell. The county reassesses at the sale price and for a brief moment they match.

Then the 2% cap kicks in again and they start pulling apart.

How to Find Out What Your Home Is Worth

Getting a Formal Appraisal

A licensed appraiser is going to get you the closest thing to a number a lender or buyer will accept. They’re comparing what nearby houses have closed at recently and adjusting for size and condition before landing on a figure.

If you’re refinancing the lender orders one as part of the process. A lot of sellers ask how the appraiser arrives at a number, and the fair market value breakdown covers what goes into that calculation.

Running Your Own Comps

If you’re just trying to get a sense of things before deciding anything, you can look up recent closed sales yourself. Your county assessor’s website shows sale prices and Redfin has pretty solid comp data.

The number you want is what homes in similar condition have closed at in the past three to six months, not what’s listed. Listing prices are what sellers are asking, and the gap between those and what buyers end up paying can run pretty wide depending on the market.

A real estate agent can do a comparative market analysis for you at no charge. Just keep in mind they’re trying to get the listing so the number might run a little high.

I don’t mean that as a knock, it’s just something to factor in when you’re looking at what they give you.

If you’ve owned the place a long time and it’s appreciated a lot, the gap between what you paid and what you sell for isn’t just a valuation question, it can trigger real capital gains tax implications. The IRS exclusion for primary residences covers a lot of situations but not all of them, and a CPA before you close is a better move than sorting it out after.

Supplemental Assessments After Improvements

A remodel or ADU addition that goes through permits triggers a supplemental assessment from the county on top of your existing bill. The improvement gets valued at current market rates, but your existing structure keeps its Prop 13 base.

A $180,000 ADU addition adds roughly $1,800 a year to the tax bill at the base 1% rate, on top of whatever local bonds and CFD charges apply. The county sends two supplemental bills: one pro-rated for the partial year the improvement was completed, and a second covering the first full year.

Sellers who recently finished a permitted improvement sometimes haven’t received both of those bills yet when they go to sell. A buyer’s lender is going to flag it when they run the impound calculation, and it can come up mid-escrow if neither party had factored it in.

If You’re Thinking About Selling

If you’ve owned your home for more than a few years in Southern California there’s a real chance your market value has gotten significantly above your assessed value. That’s a good thing, it means you’ve built up equity.

The problem is when people go into a sale anchored to the wrong number, either the tax bill or an outdated Zillow estimate, and make decisions based on that.

If you want to know what your property is worth in its current condition, that’s something we can help you figure out without putting it on the market. We buy houses in San Diego, Orange, San Bernardino, Riverside, and Los Angeles counties, we pay cash and we can move quickly if the situation calls for it.

Give us a call at (951) 331-3844 or request a cash offer here.

If you’re still weighing your options, the cash sale comparison puts commission and carrying costs on the same side of the ledger so you can see what the net difference looks like.

And if you’re dealing with an inherited property, the assessed-to-market gap is usually the first thing that comes up. The inherited house sale guide covers how that plays out for heirs in California.

Doug Van Soest spent seven years as a certified residential appraiser starting in 2003 before co-founding SoCal Home Buyers with his wife Andrea Van Soest, CA DRE #01505854. Together they have closed over 400 transactions across Southern California.