California’s property tax rate is capped at 1% of a property’s assessed value under Proposition 13, but almost no one pays exactly 1%. Once voter-approved bonds and local special taxes are added to the bill, the effective rate for most homeowners lands somewhere between 1.1% and 1.5%.1Justia. California Constitution Article XIII A – Tax Limitation The rate itself is only half the story, though. California also controls how your assessed value is set, and that number can be very different from what your home would sell for today.
The 1% Base Rate Under Proposition 13
Article XIII A of the California Constitution, added by voters through Proposition 13 in 1978, caps the ad valorem tax on real property at 1% of full cash value.1Justia. California Constitution Article XIII A – Tax Limitation That cap is uniform across all 58 counties. No county board, city council, or state agency can raise it. Changing it would take a constitutional amendment approved by California voters statewide.
Counties collect the 1% levy and distribute the revenue to school districts, cities, special districts, and the county general fund according to formulas set by state law. On your bill, this appears as the “general tax levy” line. It’s the piece of the calculation that stays simple: assessed value times 1%.
Why Your Bill Exceeds 1%
The extra charges come from voter-approved bonds and special taxes layered on top of the base. School construction bonds, infrastructure improvements, park maintenance, library funding, and fire protection appear as separate line items. Together they typically push the effective rate to between 1.1% and 1.5%, and some newer developments run higher.
A large share of the extras in newer neighborhoods flows through Mello-Roos Community Facilities Districts, authorized by the Mello-Roos Community Facilities Act of 1982.2California Legislative Information. California Government Code 53321 – Proceedings to Create a Community Facilities District These districts impose a special tax to pay for infrastructure and services in a defined area. One detail trips people up: Mello-Roos charges are not based on your assessed value. They’re structured around debt service or the specific benefits provided to your parcel.3California State Board of Equalization. Exemptions Property tax exemptions won’t reduce them, and two neighboring homes with different assessed values can owe the same Mello-Roos amount. If you’re buying in a master-planned community, check for active Mello-Roos districts before closing. The charges can add thousands to the annual bill.
How Assessed Value Is Set
California does not tax your home at what it would sell for today. The state uses an acquisition-value system that locks assessed value at your purchase price. That figure becomes your “base year value,” and the Constitution limits annual increases to whichever is less: the change in the California Consumer Price Index or 2%.1Justia. California Constitution Article XIII A – Tax Limitation A home bought for $600,000 might be assessed at $660,000 a decade later even if the market value has climbed to $900,000. Long-term owners benefit heavily.
Reassessment to current market value only happens when ownership changes or new construction occurs. Buy a home and the assessor resets the base year value to the sale price. Add a room or do a substantial remodel and the new value of that improvement gets added to your existing base. Cosmetic updates and basic maintenance don’t trigger a reassessment.
Requesting a Lower Assessment When Values Drop
The 2% cap on increases is well known. Fewer owners realize they can get a temporary reduction when market values fall. Under Proposition 8, if your property’s market value as of January 1 (the annual lien date) is below its factored base year value, the assessor should enroll the lower market value instead.4California State Board of Equalization. Decline in Value – Proposition 8 Many assessors review automatically during a downturn, but you can file a decline-in-value application with your county assessor as well. The filing window typically runs from July 2 through November 30.
One catch when the market turns back up: the assessor can increase your assessed value by more than 2% per year until it climbs back to the factored base year value. It cannot exceed that ceiling unless there’s a change of ownership or new construction, but the annual jumps during recovery can feel steep.4California State Board of Equalization. Decline in Value – Proposition 8
Supplemental Bills After a Purchase
New buyers are often caught off guard by a supplemental tax bill arriving a few months after closing. It covers the gap between the previous owner’s assessed value and your purchase price, prorated for the portion of the fiscal year remaining after the sale. California’s property tax fiscal year runs from July 1 through June 30.5California State Board of Equalization. Supplemental Assessment
The math: the county subtracts the prior assessed value from the new assessed value to get the net supplemental assessment, multiplies by the tax rate, then prorates based on months remaining in the fiscal year. A purchase in October leaves nine months, so the proration factor is 9/12. Close between January and May and you can get two supplemental bills: one for the remainder of the current fiscal year and a second for the full upcoming year.5California State Board of Equalization. Supplemental Assessment Escrow companies sometimes collect for these, but not always. Budget for them at closing.
Exemptions That Lower Your Bill
Homeowners’ Exemption
If the property is your principal residence, you qualify for a $7,000 reduction in assessed value under the homeowners’ property tax exemption.6California Legislative Information. California Revenue and Taxation Code 218 – Homeowners Property Tax Exemption At the 1% base rate, that’s about $70 off your annual bill. Modest, but you lose it entirely if you don’t file. Check your bill for the exemption line. If it’s missing, contact your county assessor and file a claim. Once activated, it stays in place as long as you own and occupy the home.
Disabled Veterans’ Exemption
Veterans with a service-connected disability rated at 100%, or compensated at the 100% rate due to unemployability, qualify for a much larger exemption. For the 2026 tax year, the basic exemption reduces assessed value by $180,671. A low-income version, available to qualifying households with income under $81,131, provides a $271,009 reduction.7California State Board of Equalization. Disabled Veterans Exemption These amounts adjust annually for inflation. Eligible veterans file a claim with the county assessor using the BOE-261-G form.
Keeping Your Rate When You Move or Inherit
Proposition 19, which took effect in stages starting in 2021, changed two situations where your assessed value can move with you or stay low across generations.
Homeowners Over 55 or With Disabilities
If you’re at least 55, severely disabled, or a victim of wildfire or natural disaster, you can transfer your current property’s tax base to a replacement home anywhere in California.8California State Board of Equalization. Proposition 19 The replacement must become your principal residence, and you have two years from the sale of the original home to buy or build it. Homeowners qualifying based on age or disability can use this up to three times. Wildfire and natural disaster victims have no limit.9California Legislative Information. California Revenue and Taxation Code 69.6
If the replacement home is the same price or cheaper, your transferred base year value stays unchanged. If it costs more, the difference is added to your transferred base. “Equal or lesser value” depends on timing. Buy before selling and the replacement must be worth no more than 100% of the original’s market value. The threshold rises to 105% if you buy within the first year after selling, and 110% in the second year.8California State Board of Equalization. Proposition 19
Inheriting From a Parent or Grandparent
Before Proposition 19, children inheriting a parent’s home kept the parent’s low assessed value whether or not they moved in. That’s no longer true. The inherited property must become the child’s principal residence within one year of the transfer, and the child must file for the homeowners’ or disabled veterans’ exemption within that same window.8California State Board of Equalization. Proposition 19 A formal claim for the exclusion must be filed within three years of the transfer or before the property is sold to a third party, whichever comes first.
Even when the child moves in, there’s a value limit. If the home’s fair market value at transfer exceeds the parent’s taxable value by more than a set allowance, the excess above that allowance is added to the tax base. The allowance started at $1 million and adjusts for inflation every two years. For transfers between February 16, 2025, and February 15, 2027, the adjusted allowance is $1,044,586.10California State Board of Equalization. Proposition 19 Fact Sheet – Intergenerational Transfer Exclusion Inherited rental properties and vacation homes no longer qualify for any exclusion and are fully reassessed to market value.
Payment Deadlines and Penalties
California property taxes are paid in two installments. The first is due November 1 and becomes delinquent at 5 p.m. on December 10. The second is due February 1 and becomes delinquent at 5 p.m. on April 10.11Taxes. Property Tax Function Important Dates If either falls on a weekend or holiday, the grace period extends to the next business day.
Miss the first deadline and a 10% penalty attaches immediately to the unpaid amount.12California Legislative Information. California Revenue and Taxation Code 2617 The second also carries a 10% penalty plus an administrative cost. There’s no warning period and no negotiating the penalty down. Mailed payments must be postmarked on or before the deadline to count as timely. Most counties also accept online payments through the tax collector’s website.