California Property Tax Percentage: 1% Rule, Real Bill Add-Ons, Calculator & County Payment Guide
California property tax is often described as “1%,” but that is only the base ad valorem tax under Proposition 13. Your actual bill can include voter-approved bonds, direct assessments, parcel taxes, Mello-Roos or district charges, and supplemental bills after purchase or new construction. This guide explains the percentage, how to calculate it, why bills vary by county, and which official office handles each task.
What percentage is California property tax?
The simple answer is 1% of taxable assessed value for the base tax. The practical answer is: your final bill may be more than 1% because California counties also bill voter-approved debt, direct assessments and special district charges.
What most searchers actually need to know
- 1Base percentage: Proposition 13 generally limits the ad valorem property tax to 1% of taxable assessed value.
- 2Actual bill: Your bill can include voter-approved bonds, direct assessments, parcel taxes, Mello-Roos, school district charges, lighting, landscape, sewer or other local assessments.
- 3Taxable value: Most California homes are taxed on assessed value, not Zillow value, list price or current market value every year.
- 4Annual cap: Under Prop 13, assessed value generally rises by no more than 2% per year unless reassessment is triggered.
- 5Correct office: County assessor handles value and exemptions; county tax collector handles bills and payments.
How to calculate California property tax percentage
Use this for a quick estimate. For exact numbers, always verify the county tax collector’s bill because county add-ons are property-specific.
Simple California property tax estimate
Taxable assessed value × 1% = base property tax. Then add bonds, direct assessments, special taxes, Mello-Roos or parcel charges from the county tax bill.
| Taxable Assessed Value | Base 1% Tax | What to Add Next |
|---|---|---|
| $400,000 | $4,000 | County bonds, special assessments, parcel taxes, Mello-Roos if listed |
| $600,000 | $6,000 | School bonds, city charges, direct assessments, sewer/lighting districts |
| $800,000 | $8,000 | Look at each line item on county tax bill |
| $1,000,000 | $10,000 | Add all voted debt and direct charges from tax collector bill |
1
Find your taxable assessed value
Do not use market price unless the property just sold and reassessed.
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Open your county assessor or tax collector property lookup. Find assessed value, net assessed value, taxable value, factored base-year value, land value and improvement value. The exact labels vary by county.
2
Apply the 1% base tax
This gives the Prop 13 general ad valorem estimate.
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Multiply taxable assessed value by 0.01. A $750,000 taxable assessed value has a base 1% tax of about $7,500 before local add-ons.
3
Add the line items from your tax bill
This is where “more than 1%” usually comes from.
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Look for voter-approved debt, fixed charges, special assessments, Mello-Roos, parcel taxes, sewer, lighting, landscape, flood, school bond or community facilities district charges. These are why two similar homes in different neighborhoods can have different effective tax percentages.
Why California property tax bills can be higher than 1%
The 1% limit does not mean your total bill must equal exactly 1% of assessed value. California property tax bills can include several non-base charges.
Voter-approved bonds
Local voters can approve debt for schools, infrastructure or public facilities. These amounts may appear as a separate tax rate or line item.
Direct assessments
Local agencies may add assessments for services such as sewer, lighting, landscaping, flood control, refuse or neighborhood improvements.
Mello-Roos / CFD
Some newer developments have Community Facilities District charges that can materially increase the effective tax percentage.
| Bill Line | Does It Count Inside the 1%? | What It Means |
|---|---|---|
| General tax levy | Yes, usually the base 1% | Prop 13 ad valorem tax on taxable assessed value. |
| Voted indebtedness | Added separately | Debt approved by voters, often schools or local bonds. |
| Direct assessment | Added separately | Fixed or formula-based charge from a local agency. |
| Mello-Roos / CFD | Added separately | Community facilities district charge for public improvements/services. |
| Supplemental bill | Separate billing event | Extra bill after change in ownership or new construction reassessment. |
How Proposition 13 affects your California property tax percentage
Prop 13 is the reason California tax bills are based on assessed value with limited annual growth, not full market value every year.
Base-year value
When property changes ownership or new construction is completed, the assessor may establish a new base-year value.
Annual growth cap
Assessed value generally increases by no more than 2% per year, unless reassessment is triggered by ownership change, new construction or another rule.
Market value can be higher
Your home’s market value may rise faster than assessed value. That is why long-time owners can have lower taxable values than recent buyers.
Purchase can reset tax value
Buying a property often triggers reassessment to current market value, creating a larger annual bill and possible supplemental bill.
California supplemental property tax bills after buying or building
Supplemental taxes surprise many buyers because they are separate from the regular annual secured tax bill and may not be handled the same way as escrowed annual taxes.
1
A reassessment event occurs
Usually purchase, ownership change or completed new construction.
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The county assessor reviews the change and calculates the difference between the prior assessed value and the new value for the affected period.
2
County issues supplemental assessment
A positive difference can create one or two extra bills.
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The BOE explains that when a positive supplemental assessment is created, the increase in taxes is calculated and the county tax collector mails one or possibly two supplemental tax bills.
3
Do not assume your lender paid it
Supplemental bills can be separate from normal escrow flow.
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If your mortgage has an impound/escrow account, still open every supplemental bill and ask the lender and tax collector how it will be paid. Do not ignore it because the annual tax bill is escrowed.
California property tax due dates for secured property
Most California secured property tax bills are paid in two installments. Counties publish exact payment rules and online cut-off times, so verify with your county tax collector.
| Installment | Due Date | Delinquent After | What to Do |
|---|---|---|---|
| First installment | November 1 | December 10 | Pay online, mail with postmark, or pay by county-approved method before deadline. |
| Second installment | February 1 | April 10 | Pay by the county tax collector’s deadline; confirm receipt if paying near the date. |
| Supplemental bill | Date shown on bill | Date shown on bill | Treat separately from regular annual bill; confirm lender/escrow handling. |
| Unsecured property | Different schedule | Different schedule | Check county tax collector for business/personal property due date. |
California homeowners’ exemption and other property tax savings
The homeowners’ exemption does not change the 1% rate. It reduces assessed value before the rate is applied, so the savings appear as a lower taxable amount.
Homeowners’ exemption
Can reduce assessed value by up to $7,000 for an owner-occupied principal residence. File with the county assessor.
Disabled veterans’ exemption
California has disabled veterans’ property tax exemption rules administered through county assessors and BOE guidance.
Prop 19 transfer rules
Prop 19 affects some base-year value transfers and certain parent-child or grandparent-grandchild reassessment exclusions.
Disaster relief
Properties damaged by qualifying disasters may have special reassessment or tax relief options through county assessors.
1
Find your county assessor
Exemptions are filed at county level.
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Use the BOE county contacts directory to find your county assessor. Search your property and verify whether an exemption already appears.
2
File the homeowners’ exemption if eligible
Do this if the home is your principal residence.
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The BOE says the homeowners’ exemption requires a one-time filing with the county assessor where the property is located. Use your county assessor’s claim form and follow local filing instructions.
3
Check Prop 19 before transferring property
Transfers can trigger reassessment if rules are not met.
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Before parent-child transfer, senior base-year transfer, disability base-year transfer, disaster replacement or inherited property planning, review BOE Proposition 19 resources and speak with the county assessor or qualified tax/legal professional.
Can you appeal a California property tax value?
Yes, but the appeal is usually about assessed value, assessment status, ownership/reassessment issue or exemption issue—not simply because the bill feels expensive.
Assessor review
Start by reviewing property characteristics, value notice and comparable market data. Many counties offer informal assessor review before formal appeal.
Assessment appeal
California counties use assessment appeals boards or county boards acting as local boards of equalization to hear appeals.
Deadlines vary
Filing windows can vary by county and notice timing. Use the county clerk/assessment appeals board instructions for your property.
Pay while appealing
An appeal usually does not automatically stop penalties. Ask the county tax collector about payment while appeal is pending.
Which California office handles property tax percentage questions?
California property tax has three main county roles. Using the wrong office wastes time.
| Question | Correct Office | Why |
|---|---|---|
| What is my assessed value? | County Assessor | Assessor values property, applies exemptions and updates ownership/assessment records. |
| How much do I owe? | County Tax Collector | Tax collector bills, collects, posts payments and issues receipts. |
| Why are there extra line items? | Tax Collector / listed agency | Tax bill shows voter debt, direct assessments and agency charges. |
| Can I appeal the value? | Assessment Appeals Board / Clerk | Formal assessment appeals are filed with the county’s appeal process. |
| Is my exemption applied? | County Assessor | Exemption applications and status are assessor functions. |
California property tax map reference
California has 58 counties. Your tax percentage and final bill depend on the county, city, school district, special districts and parcel-level charges where the property sits.
Official California property tax resources
Use these links for live verification, official forms, deadlines, appeal filing and county-specific payment pages.
California Property Tax Percentage FAQs
Short answers for homeowners, buyers, escrow customers and people comparing California county tax bills.
QWhat is the California property tax percentage?▾
California’s base ad valorem property tax is generally 1% of taxable assessed value. The final bill can be higher after voter-approved bonds, direct assessments, Mello-Roos and other local charges.
QWhy is my bill 1.2%, 1.3% or more?▾
Because the 1% rule does not include every charge. Your county tax bill can add school bonds, city bonds, parcel taxes, Mello-Roos, sewer, lighting, landscaping, flood control or other direct assessments.
QIs California property tax based on purchase price?▾
Often, after a purchase, the county assessor establishes a new base-year value close to market/purchase value. After that, Prop 13 generally limits annual assessed-value increases to no more than 2% unless another reassessment event occurs.
QCan my assessed value rise more than 2%?▾
It can if there is a reassessment event, such as change in ownership, new construction, restoration from a temporary decline-in-value reduction, or another legally recognized event.
QWhat is the homeowners’ exemption worth?▾
The homeowners’ exemption can reduce assessed value by up to $7,000 for a qualifying owner-occupied principal residence. It reduces taxable value, not the tax rate itself.
QDo I pay property tax through the state?▾
No. California property taxes are handled locally. County assessors determine assessed value and exemptions, while county tax collectors bill and collect property taxes.
QWhen are California property taxes due?▾
For most secured property tax bills, the first installment is due November 1 and delinquent after December 10. The second installment is due February 1 and delinquent after April 10.
QWhat is a supplemental tax bill?▾
It is a separate bill after a change in ownership or new construction reassessment. A buyer can receive one or two supplemental bills in addition to the regular annual secured tax bill.
QCan I appeal the percentage?▾
You usually appeal the assessed value or assessment issue, not the basic 1% rate. For extra line items, contact the tax collector or the agency listed on the bill.
QIs PropertyTaxUSA.org official?▾
No. PropertyTaxUSA.org is an independent informational guide. Always verify assessed value, exemptions, bills, payment status and deadlines with your county assessor, tax collector or official California BOE resources.
Bottom line
California property tax percentage is best understood as 1% base tax plus local add-ons. Use assessed value—not current market value—to estimate the base tax, then add voter-approved bonds, assessments, Mello-Roos and parcel charges from your county tax bill. For value or exemption problems, contact the county assessor. For payment, receipt or delinquency questions, contact the county tax collector.
Independent guide notice: This page is not the California Board of Equalization, a county assessor, a county tax collector, a payment portal, or legal/tax advice. Official state and county sources control values, rates, exemptions, due dates, appeals and payment status.