California property tax is based on the assessed value of your home, not its market value

California property tax is calculated using Proposition 13, a state law passed in 1978 that fundamentally changed how the state taxes real estate. Under this system, your property tax bill is based on the assessed value of your home at the time you bought it, not what it is worth today. This assessed value increases by a maximum of 2 percent per year, regardless of how much your home's actual market value rises.

The tax rate itself is set by your county and typically ranges from 0.76 percent to 1.25 percent of the assessed value, depending on where you live. Most California counties charge close to 1 percent. This means a home assessed at $500,000 in a county with a 1 percent rate would generate a $5,000 annual property tax bill — but that bill would only grow by about $100 per year unless the property changes ownership.

When you sell your home or it transfers to someone other than a spouse or direct descendant, the county reassesses it at current market value. This reassessment is what creates the "surprise" many new homeowners experience: your property tax can jump significantly the year after you purchase.

Key Takeaways

  • Your property tax bill is based on the assessed value of your home when you bought it, capped at 2 percent annual increases, not on current market value.
  • The tax rate varies by county but is typically around 0.76 to 1.25 percent of assessed value.
  • When you buy a home or it transfers outside your when ready family, the county reassesses it at market value, which can significantly raise your tax bill.
  • Your property tax bill includes not just the base rate but also voter-approved bonds and special assessments for schools, fire districts, and local improvements.
  • Homeowners over 55 can transfer their low assessed value to a replacement home in the same county under Proposition 60.

How the assessed value is determined and when it changes

The county assessor's office determines the assessed value of your property. When you first purchase a home, they assess it at the purchase price (or appraised value if that is lower). From that point forward, the assessed value can only increase by up to 2 percent per year, even if your home doubles in market value.

The reassessment happens automatically when ownership changes. If you inherit a home from a parent or spouse, you may be exempt from reassessment under Proposition 13's family transfer rules — but if you inherit from anyone else, or if you buy the home, reassessment occurs. The county assessor's office sends you a notice of assessed value, usually within a few months of purchase or transfer.

You can challenge the assessed value if you believe it is incorrect. You have 30 days from the date on the assessment notice to file an informal appeal with the assessor's office, or you can file a formal appeal with the county Assessment Appeals Board. Many homeowners successfully challenge assessments by providing comparable sales data or evidence of property defects.

What is included in your property tax bill beyond the base rate

Your property tax bill is not just the county's base rate applied to assessed value. It also includes voter-approved bonds and special assessments for schools, fire protection districts, water districts, flood control, and local infrastructure improvements. These add-ons vary significantly by location.

For example, a home in one county might pay the base 1 percent rate plus an additional 0.3 percent for school bonds, 0.1 percent for a fire district, and 0.05 percent for a water district. Another home in a different county might pay a lower or higher total depending on what bonds and assessments are in place there. Your property tax bill itemizes all of these, so you can see exactly what each portion funds.

Some assessments are temporary — they expire after a set number of years once the bond is paid off. Others are permanent. When you receive your annual property tax bill, it will list each assessment separately so you understand what you are paying for.

How property tax bills are calculated year to year

Once your home is assessed, your property tax bill grows predictably. The assessed value increases by up to 2 percent annually, compounded. If your assessed value is $500,000 in year one, it becomes $510,000 in year two (a 2 percent increase), then $520,200 in year three, and so on. Your tax rate stays the same, so the bill grows at roughly the same rate as the assessed value.

The only time this changes is if you make major improvements to your home. Adding a room, a pool, or a new roof can trigger a reassessment of just that improvement, raising your assessed value beyond the normal 2 percent cap. The county assessor's office monitors building permits and property records to identify these improvements.

Your bill is due in two installments: one in November and one in February. If you pay through escrow (which most mortgage holders do), your lender collects the money monthly and pays the county on your behalf. If you own your home outright, you receive the bill directly and must pay by the due dates or face penalties and interest.

Proposition 60 and transferring your assessed value

If you are 55 or older and own your home, you may be able to transfer your low assessed value to a replacement home under Proposition 60 (or Proposition 90 if you are moving to certain other counties). This is one of the few ways to keep your assessed value from jumping when you sell and buy again.

To use Proposition 60, you must purchase a replacement home of equal or lesser value within two years before or after you sell your current home. The new home will be assessed at the same value as your old home (adjusted for inflation), rather than at the new purchase price. You must file a claim with the county assessor's office within three years of the purchase.

This benefit applies only to your primary residence. If you own investment property or a second home, those do not may have access to. You can use Proposition 60 only once per lifetime, so the decision to move and transfer your assessed value is significant.

Common misconceptions about California property tax

Many people believe that California property tax is the lowest in the nation because of Proposition 13. While the assessed-value system does keep bills lower than they would be in states that reassess every year, California's effective tax rate (what you actually pay as a percentage of market value) varies widely. A home worth $1 million might have an assessed value of $400,000, making the effective rate much lower than the nominal rate. But a newly purchased home pays tax on its full market value, so new buyers often pay more than long-term owners in the same neighborhood.

Another misconception is that you can avoid reassessment by adding a family member to the deed. Reassessment is triggered by a change in ownership percentage, not by the number of names on the title. If you add someone who did not previously own the property, even partially, it counts as a change in ownership and triggers reassessment.

Some people also assume that property tax in California is deductible on their federal income tax return without limit. Federal tax law caps the deduction for state and local taxes (SALT) at $10,000 per year, which affects many California homeowners. This is a federal rule, not a California one, but it significantly impacts the actual cost of homeownership for higher-income earners.

Frequently Asked Questions

What happens to my property tax if I inherit a home from my parent?

If you inherit from a parent or grandparent, you are generally exempt from reassessment under Proposition 13's family transfer rules, and the home keeps its low assessed value. You must file a claim with the county assessor's office to document the family relationship. If you inherit from anyone else, or if you later sell the home, reassessment occurs at market value.

Can I lower my property tax bill by appealing the assessed value?

Yes. You have 30 days from the assessment notice to file an informal appeal with the assessor's office. If you believe the assessed value is higher than comparable homes sold nearby, or if your home has significant defects, you can present evidence to support a lower value. Many counties also allow formal appeals to the Assessment Appeals Board if the informal process does not resolve the issue.

Does adding a solar panel system or making energy-efficient improvements increase my property tax?

No. California law exempts solar energy systems and certain other energy-efficient improvements from property tax assessment. You must file an exemption claim with the county assessor's office, but once approved, these improvements do not trigger a reassessment or increase your assessed value.

What is the difference between property tax and homeowners insurance?

Property tax is paid to the county and funds schools, fire districts, and local services. Homeowners insurance is paid to an insurance company and covers damage to your home and liability. Both are often collected through escrow by your mortgage lender, but they are separate bills that fund different things.

If I buy a home with my spouse, do we both have to be on the deed to avoid reassessment later?

Both spouses should be on the deed if you want to preserve the low assessed value if one spouse passes away. If only one spouse is on the deed and that person dies, the surviving spouse may face reassessment. Consult a real estate attorney or your county assessor's office about the best way to hold title in your situation.