What First-Time Buyers Should Know About Property Taxes in California

Jan 27, 2027 · By Oanh Nguyen · Broker & Loan Officer · Buying

For most homeowners, property taxes are one of the biggest costs of owning a home after the mortgage itself. Yet many first-time buyers don't know how much they'll owe, when the bills come or why their first-year bills can be confusing.

In California, the basics are fairly predictable once you understand them. In this post, I'll explain how to estimate your property taxes, how reassessment works when you buy, what supplemental tax bills are, which local charges may appear, how impound accounts work, the homeowners' exemption, due dates and how to verify everything.

This is general education, not tax or legal advice. For questions about your specific property or situation, contact the county assessor or tax collector, or talk with a CPA.

The Basics

The State Board of Equalization's Publication 29 (March 2025) explains California's property tax system. Key points:

• The basic tax rate is 1 percent of the property's taxable value.
• Voter-approved rates for local bonds can be added to that 1 percent.
• Assessed values are generally limited to annual increases of no more than 2 percent, as long as there's no change in ownership or new construction.
• When you buy, the property is generally reassessed at its current market value, often the purchase price.

My post on Prop 13 and Mello-Roos basics explains these rules in more depth.

Step 1: Make a Base Estimate

Use your expected purchase price as a starting point.

Simple estimating steps:

1. Start with your purchase price.
2. Apply the 1 percent base rate.
3. Add the voter-approved rates for the property's tax rate area. You can often find the total rate on the current tax bill.
4. Add fixed charges, like parcel taxes and special assessments (see below).
5. Subtract the homeowners' exemption effect, if you'll qualify (see below).

Worksheet:

Don't use the seller's tax bill total. If the seller bought years ago, their assessed value may be much lower than your purchase price, so their bill may be much lower than yours will be.

Step 2: Understand Reassessment

When you buy, the county assessor reassesses the property, usually at the purchase price. This new value becomes your base year value. In future years, it can generally increase by no more than 2 percent a year, unless there's new construction or another change in ownership. Values can also be lowered in some cases if market values fall.

Step 3: Plan for Supplemental Tax Bills

This is the part that surprises many first-time buyers.

Because the regular tax bill is based on the assessment as of January 1, the county issues supplemental tax bills to cover the difference between the old and new assessed values after you buy. Publication 29 explains that the supplemental assessment covers the portion of the fiscal year remaining after the change in ownership, and in some cases a second supplemental bill covers the next fiscal year.

What to know:

• Supplemental bills often arrive months after closing.
• They're often not paid through your lender's impound account automatically. Check with your lender.
• They're mailed to you, so keep your mailing address current with the county.

Tip: Set aside money for supplemental bills in your first year. Alameda County offers an online supplemental tax estimator.

Step 4: Check for Local Charges

Your tax bill may include more than the 1 percent and voter-approved rates.

• Parcel taxes: fixed amounts per parcel for schools, parks or other services.
• Special assessments: for things like lighting, landscaping or sewer districts.
• Mello-Roos (Community Facilities District) taxes: in some newer developments.

How to find them:

• Review the current tax bill line by line.
• Read the Natural Hazard Disclosure and tax reports provided during escrow.
• Ask the seller and your agent about any Mello-Roos or special districts.

Step 5: The Homeowners' Exemption

Publication 29 explains that the California Constitution provides a $7,000 reduction in taxable value for qualifying owner-occupied homes that are the owner's principal place of residence. Rentals and vacation homes don't qualify.

What to do: file a one-time claim with the county assessor after you move in. Many counties mail the form after a sale. Publication 29 notes February 15 as the legal deadline for filing most exemption claims. Ask your county assessor about timing for your purchase.

Step 6: Know the Due Dates

Publication 29 explains the regular schedule:

• Bills are mailed by November 1.
• First installment: due November 1, delinquent after December 10.
• Second installment: due February 1, delinquent after April 10.
• Late payments carry a 10 percent penalty.

Supplemental bills have their own due dates, printed on the bill.

Step 7: How Impound (Escrow) Accounts Work

Many lenders collect property taxes and insurance with your monthly mortgage payment, through an impound or escrow account. The CFPB explains how these work.

What to know:

• Your lender pays the regular tax installments from the account.
• Your monthly payment may change each year after the lender reviews the account.
• Supplemental bills may or may not be paid from the account. Ask your lender.
• If you don't have an impound account, you pay the county directly.

Step 8: Taxes at Closing

At closing, property taxes are usually prorated between buyer and seller based on what's been paid and the closing date. Your lender may also collect money to start your impound account. My post on buyer closing costs explains these items.

Step 9: Verify Your Estimate

Before you commit:

• Ask your lender to include a realistic tax estimate in your Loan Estimate.
• Check the county's tax information for the property.
• Contact the county assessor or tax collector with questions.
• Ask your agent about any special districts.

Property Taxes and Your Budget

Property taxes affect more than your annual bill. They're part of your monthly housing payment and your loan qualification.

• Lenders include property taxes in your housing payment when calculating your debt-to-income ratio.
• Higher taxes in areas with more voter-approved rates or special charges can reduce what you qualify for.
• Two homes at the same price can have different tax bills because of local charges.

When comparing homes, ask your lender to run your numbers with each home's estimated taxes. My post on how much house you can afford explains how taxes fit into your overall budget.

Where to Find Tax Information

In Santa Clara County, the Department of Tax and Collections and the Assessor's Office handle these questions. In Alameda County, the Treasurer-Tax Collector and Assessor do. Check each county's website for current contact information.

Your First Year as a Homeowner

Here's what the first year often looks like:

1. At closing: taxes are prorated, and your impound account may be funded.
2. First few months: file the homeowners' exemption.
3. Several months after closing: supplemental bill(s) arrive.
4. Next fall: your first regular bill based on your new assessed value.
5. Each year: your lender reviews your impound account and may adjust your payment.

Property Tax Checklist for First-Time Buyers

• ☐ Estimated yearly taxes based on my purchase price.
• ☐ Reviewed the current tax bill for special charges.
• ☐ Asked about Mello-Roos or special districts.
• ☐ Planned for supplemental bills in year one.
• ☐ Asked my lender how impounds and supplemental bills work.
• ☐ Will file the homeowners' exemption after moving in.
• ☐ Know the installment due dates.

Common Mistakes

1. Using the seller's tax bill as your estimate.
2. Forgetting supplemental bills.
3. Missing special assessments or Mello-Roos.
4. Not filing the homeowners' exemption.
5. Missing due dates if you don't have an impound account.

Key Takeaways

• Taxes are generally based on your purchase price after you buy.
• The base rate is 1 percent, plus voter-approved rates and local charges.
• Plan for supplemental bills in your first year.
• File the homeowners' exemption for your primary residence.
• Know your due dates and how your impound account works.

A Hypothetical Example

This example is made up to show the process. It is not based on any real home, buyer or tax bill.

A first-time buyer is under contract on a townhome. The seller's tax bill looks low because they bought many years ago. The buyer's agent explains that taxes will be reassessed at the purchase price.

The buyer uses the total tax rate and fixed charges from the current bill to estimate their own taxes, and their lender uses a similar estimate in the Loan Estimate. After closing, they file the homeowners' exemption. A few months later, a supplemental bill arrives. Because they had set aside money for it, it isn't a surprise.

Frequently Asked Questions

How I Can Help

As a broker and loan officer, I help first-time buyers estimate property taxes based on their purchase price, spot special charges on tax bills, plan for supplemental bills and understand how impounds work. Loan approval always depends on lender review and approval.

The Bottom Line

Property taxes in California are generally based on your purchase price, plus local rates and charges. Make a realistic estimate, check for special assessments, plan for supplemental bills, file the homeowners' exemption and know your due dates.

Want an estimate for a home you're considering? Let's look at the numbers together.

Sources

• California State Board of Equalization, California Property Tax: An Overview, Publication 29 (March 2025): https://www.boe.ca.gov/proptaxes/pdf/pub29.pdf
• Alameda County supplemental tax estimator: https://propinfo.acgov.org/SubTaxesCalculator/TaxCalculator.html
• Alameda County Auditor-Controller, Property Tax FAQs: https://auditor.alamedacountyca.gov/tax-faqs/
• Consumer Financial Protection Bureau, "What is an escrow or impound account?": https://www.consumerfinance.gov/ask-cfpb/what-is-an-escrow-or-impound-account-en-140/
• IRS Publication 530, Tax Information for Homeowners: https://www.irs.gov/publications/p530

Estimate property taxes on a home you're considering. Call or text me at 408-780-1188, or email onrealtygroup@gmail.com.

Oanh Nguyen · Broker & Loan Officer · On Realty Group, brokered by LPT Realty · BRE #02133991 · NMLS 2020335

Equal Housing Opportunity.

Loan disclosure: Oanh Nguyen, Broker | Loan Officer, On Realty Group, brokered by LPT Realty, BRE #02133991, NMLS #2020335. This post is general education, not a loan offer, rate quote or commitment to lend. Loan programs, guidelines and eligibility change and are subject to lender review and approval.

Disclaimer: This post is general information only, not an appraisal or legal, tax or financial advice; data comes from the public sources linked above, is believed reliable but not guaranteed, and can change at any time.