Property Taxes in California, Explained: What Every San Diego County Homeowner Should Know

If you own a home anywhere in San Diego County, from the coast to the mountains, you get a property tax bill every year. Most of us pay it (or our lender pays it through an impound account) without thinking much about how the number was calculated. But understanding how property taxes actually work in California can save you real money, especially when you buy, sell, inherit, or rebuild after a disaster.

This is a longer read, so grab a cup of coffee. By the end you will understand what property taxes are, why they go up, when they can go down, what Proposition 13 and Proposition 19 actually do, and what happened with the property tax initiative that was pulled from this November's ballot.

One note before we start: I am a Realtor, not a tax professional. This post is educational. For advice on your specific situation, talk to a CPA, tax attorney, or the San Diego County Assessor's office.

What Are Property Taxes and How Do They Work?

Property taxes are local taxes paid by property owners to fund local services: public schools, fire protection, roads, libraries, county services, and water and sanitation districts. Unlike income tax, which goes mostly to the state and federal government, the money from your property tax bill stays local. A meaningful portion of what funds San Diego County schools and services comes from the property taxes we all pay.

How your bill is calculated

In California, your property tax bill is based on your home's assessed value, not its current market value. This is the single most important concept in this entire post, and it is where California differs from most other states.

Here is the basic formula:

Assessed value x tax rate = your annual property tax

The base tax rate in California is 1 percent of assessed value. On top of that 1 percent, you pay for any voter-approved bonds and special assessments in your area, such as school bonds or water district charges. Across San Diego County, the effective total rate typically lands somewhere between roughly 1.1 and 1.25 percent depending on your specific tax rate area. Newer master-planned communities may also carry Mello-Roos special taxes, which fund the infrastructure that was built to support those neighborhoods and can add meaningfully to the bill. Your tax bill itemizes each of these, so pull out last year's bill and take a look. It is more readable than you might expect.

Assessed value vs. market value

When you buy a home, the purchase price generally becomes your base year value. That is your starting assessed value. From there, your assessed value can only increase by a maximum of 2 percent per year, no matter what the market does. This is the heart of Proposition 13, which we will cover in detail below.

This is why two neighbors in nearly identical homes on the same street can pay wildly different property taxes. A family that bought in 2003 for $400,000 is paying taxes on an assessed value that has grown slowly from that number. The family that bought the house next door last year for $950,000 is paying taxes based on $950,000. Both are following the same rules. The difference is when they bought.

When and how you pay

Property taxes in California run on a fiscal year from July 1 to June 30 and are billed in two installments:

• First installment: due November 1, delinquent after December 10
• Second installment: due February 1, delinquent after April 10

If you have a mortgage with an impound account, your lender collects a portion each month and pays the bill for you. If you own free and clear or waived impounds, you pay the county directly, and those December and April deadlines matter. Late payments carry an immediate 10 percent penalty.

The supplemental tax bill surprise

Here is something I make sure every buyer I work with understands. When you purchase a home, the county reassesses it to your purchase price, but that reassessment takes time to process. In the meantime, you have been paying taxes based on the previous owner's lower assessed value. The county eventually sends a supplemental tax bill to make up the difference, and it often arrives months after closing, when new homeowners have mentally moved on.

If you bought recently and a surprise bill shows up from the county, it is probably this. It is legitimate, it is a one-time catch-up, and it is not paid by your impound account in most cases, so plan for it.

What Makes Property Taxes Increase?

Under California law, there are a limited number of things that can push your property tax bill up:

1. The annual inflation adjustment. Your assessed value can rise up to 2 percent per year. In most years, it does rise by the full 2 percent.

2. A change of ownership. When a property sells, it is reassessed at the new purchase price. This resets the base year value and is the biggest tax event in the life of a property. Certain transfers are excluded from reassessment, such as transfers between spouses and some family transfers, which we will get to under Proposition 19.

3. New construction. If you add square footage, build an ADU, add a garage, or make other significant improvements, the value of the new construction is assessed and added to your existing base. Important detail: only the new construction gets assessed at current value. Your original home keeps its protected assessed value. Normal maintenance and repairs, like a new roof or repainting, do not trigger reassessment.

4. Voter-approved bonds and assessments. When voters in your school district or other local district approve a new bond or parcel tax, that gets added to everyone's bill. This is the part of your tax bill that Proposition 13 does not cap, which is why paying attention to what is on your local ballot matters.

5. Restoration of previously reduced value. If your assessed value was temporarily lowered during a market downturn (more on that next), it can be restored faster than 2 percent per year as the market recovers, until it catches back up to where it would have been.

Can Property Taxes Decrease? Yes, in Several Situations

This is the part most homeowners never hear about. Your property taxes are not a one-way street.

Proposition 8 decline-in-value reassessment. Passed in 1978 alongside Proposition 13, Prop 8 requires the county to temporarily lower your assessed value if the market value of your home falls below its assessed value as of January 1. This happened on a large scale across San Diego County after 2008. If you believe your home is worth less than its assessed value, you can file a decline-in-value review request with the San Diego County Assessor, and there is no fee to do so.

Assessment appeals. If you disagree with your assessed value and an informal review does not resolve it, you can file a formal appeal with the county's Assessment Appeals Board. In San Diego County, the regular filing window runs from July 2 through November 30 each year.

Misfortune and calamity relief. San Diego County knows wildfire, from the Cedar Fire in 2003 to the Witch Creek Fire in 2007 and plenty of smaller fires since. If your property is damaged or destroyed by a wildfire, flood, or other disaster, you can apply for a reassessment reflecting the damage, which lowers your taxes while you recover and rebuild. In San Diego County, you generally must file within 12 months of the damage, and the damage must exceed $10,000. When you rebuild a substantially equivalent home, your original Prop 13 base year value can be restored. This is a form worth knowing about before you ever need it.

Exemptions. The homeowners' exemption knocks $7,000 off the assessed value of your primary residence, which saves you around $70 or more per year. It is small, but it is free, you only file once, and a surprising number of eligible homeowners never claim it. Disabled veterans may qualify for a much larger exemption on their primary residence, which matters in a county with one of the largest military and veteran populations in the country.

What Is Proposition 13?

Proposition 13, passed by California voters in 1978, is the foundation of everything above. Before Prop 13, homes were regularly reassessed to market value, and during the rapid appreciation of the 1970s, longtime homeowners, especially retirees on fixed incomes, were being taxed out of homes they had owned for decades.

Prop 13 changed the California Constitution to do four main things:

1. Capped the base property tax rate at 1 percent of assessed value.
2. Limited annual increases in assessed value to 2 percent, regardless of market appreciation.
3. Set reassessment to market value only upon change of ownership or new construction.
4. Required a two-thirds vote of the Legislature to raise state taxes and a two-thirds vote of the electorate for local special taxes.

The practical effect is predictability. When you buy a home, you can estimate your property taxes for decades into the future, because the rules limit how fast the number can grow. In a county where home values have climbed as dramatically as they have here, Prop 13 is the reason a rising market does not price you out of the home you already own.

What Is Proposition 19?

Proposition 19 passed in November 2020 and took effect in 2021. It made two major changes, one that helps certain homeowners and one that significantly changed family inheritance planning.

The portability benefit

Prop 19 allows homeowners who are 55 or older, severely disabled, or victims of a wildfire or natural disaster to sell their primary residence and transfer their low Prop 13 assessed value to a replacement home anywhere in California, up to three times.

Before Prop 19, this kind of transfer (under the old Props 60 and 90) was mostly limited to moves within the same county or a short list of participating counties, and you could only do it once. Now the whole state is open.

Here is how it works. If the replacement home costs the same or less than what you sold for, your old assessed value moves with you. If the replacement home costs more, you take your old assessed value and add the difference between the two prices. Either way, the savings compared to a full reassessment can be substantial.

This is a genuinely useful tool for San Diego County homeowners. I talk with longtime owners who feel stuck in a home that no longer fits, whether that means downsizing after the kids are gone, trading a two-story for a single-level, moving from the coast inland or from the city to the mountains, or relocating closer to grandkids. Prop 19 means the property tax bill no longer has to be the thing that keeps you from moving. And for wildfire victims, the disaster provision applies regardless of age.

The inheritance change

The second half of Prop 19 is less popular. Before 2021, under Props 58 and 193, parents could transfer a home and up to $1 million of assessed value in other property to their children without any reassessment, whether or not the kids ever lived there. Grandparent to grandchild transfers were covered in certain cases too.

Prop 19 narrowed this considerably. Now, to keep the parents' low assessed value:

• The child must make the inherited home their primary residence, generally filing for the homeowners' exemption within one year, and
• Even then, the exclusion is capped. If the home's market value exceeds the parents' assessed value by more than roughly $1 million (this cap adjusts over time), the amount above the cap is added to the assessed value.

Inherited rental properties, vacation homes, and cabins no longer qualify for the exclusion at all. They are reassessed to market value on transfer.

For San Diego County families, this matters more than almost anywhere. With median home values where they are, a house purchased decades ago in Point Loma, La Mesa, or Alpine can easily exceed that exclusion cap, and a rental property or family cabin passed to the next generation now comes with a full reassessment. If keeping property in the family is part of your plan, this is exactly the kind of situation where sitting down with an estate planning attorney before a transfer happens is worth every penny.

Other Propositions Worth Knowing

A quick reference list, since California's property tax history is basically a series of ballot propositions:

• Prop 8 (1978): Temporary reductions in assessed value when the market drops. Still active.
• Props 60 and 90 (1986, 1988): The original over-55 base year transfers. Superseded by Prop 19.
• Props 58 and 193 (1986, 1996): The original parent-child and grandparent-grandchild transfer exclusions. Superseded by Prop 19.
• Prop 218 (1996): Requires voter approval for most local taxes, assessments, and property-related fees.
• Props 50 and 171 (1986, 1993): Base year value transfers for properties destroyed in a governor-declared disaster. Prop 19 now covers much of this ground statewide for disaster victims.

The Initiative That Was Pulled From the November Ballot

Now to the current events question, because it made headlines this summer and I have had people ask about it.

The Howard Jarvis Taxpayers Association, the same organization behind Prop 13, qualified an initiative for the November 2026 ballot called the Local Taxpayer Protection Act. It had two main components. First, it would have sharply capped local real estate transfer taxes, the fees some cities charge when a property sells. The primary target was Los Angeles's Measure ULA, the so-called mansion tax of up to 5.5 percent on high-value sales. Second, it would have required a two-thirds voter approval threshold for local special taxes placed on the ballot by citizen initiative, closing a loophole that currently lets those pass with a simple majority, and it would have applied that rule retroactively to some taxes passed since 2017.

In late June 2026, after negotiations involving the Governor's office, legislative leaders, and various interest groups, the association withdrew the initiative before the deadline. In its place, the Legislature put a narrower compromise measure on the November ballot: voters will decide whether future local special taxes proposed by citizen initiative should require a two-thirds vote instead of a simple majority. The transfer tax caps were dropped entirely, and the compromise does not apply retroactively to existing taxes.

Is this something to worry about?

For San Diego County homeowners, the honest answer is no, not in any direct way. A few points of perspective:

Nothing about this changes your annual property tax bill. Neither the withdrawn initiative nor the compromise measure touches Prop 13's core protections: the 1 percent rate cap, the 2 percent annual increase limit, and reassessment only on sale or new construction. Those remain fully in place.

The transfer tax fight was aimed elsewhere. San Diego County's standard documentary transfer tax is $1.10 per $1,000 of sale price, which is the baseline rate statewide. The initiative targeted cities like Los Angeles that have layered on much higher rates. No city in San Diego County has anything comparable to Measure ULA.

What you will actually see in November is the compromise measure on the two-thirds threshold for future citizen-initiated special taxes. Supporters say it restores the higher approval bar that Prop 13 intended for special taxes. Opponents note it would make it harder for communities to pass future local funding measures, which can include things like parcel taxes for schools, transit, or fire protection. That is a genuine tradeoff, and reasonable people land on different sides of it. Read the ballot arguments and decide what fits your priorities.

One more thing to watch: a separate effort to restore the parent-child transfer exclusion that Prop 19 removed, often called the Repeal the Death Tax initiative, did not gather enough signatures to qualify for the 2026 ballot. Its backers have said they intend to keep trying, so the inheritance rules described above remain the law for now, and this issue is likely to come back in a future election cycle.

The Bottom Line for San Diego County Homeowners

California property taxes reward understanding the rules. Your purchase price sets your base. Time and Prop 13 protect you from runaway increases. Prop 19 gives you options if you are 55 or older, disabled, or rebuilding after a fire, and it changed the math on passing property to your kids. Reductions, exemptions, and disaster relief exist, but only if you file for them.

If you are thinking about buying, selling, downsizing with a Prop 19 base year transfer, or figuring out what an inherited family property means for your taxes, I am happy to walk through the numbers for your specific situation and point you to the right professionals for the tax and legal side.

I have lived in San Diego County's East County mountains for nearly 25 years, and I have sat at plenty of kitchen tables helping neighbors sort through exactly these questions. There is no such thing as a silly property tax question. Reach out anytime.

Jen Kleist is a Realtor with Coldwell Banker West serving San Diego County, based in the East County mountain communities of Alpine, Descanso, Pine Valley, and Mt. Laguna. DRE #02228818. This article is for educational purposes and is not tax or legal advice. Consult a qualified tax professional, attorney, or the San Diego County Assessor's office regarding your specific circumstances.