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San Mateo County dates and official links

San Mateo County Property Tax Calculator

Estimate from home value, or use taxable value and the rate on your bill.

Tools: San Mateo County, CA

Property tax calculator

Estimate for San Mateo County, CA

Estimated annual property tax $9,519

$1,559,600 home value × 0.61% Census effective rate ≈ $9,519 per year. Uses the unrounded ratio; your actual bill may differ.

Estimate only. Not tax, legal or financial advice; confirm with your county.

Get county tax reminders

Starts at the county’s Census median: $1,559,600. Change it to your best estimate.

The Census estimate describes owner-occupied homes in 2020–2024. It does not calculate a parcel’s current assessment or exemption savings. Use your bill details to test an exemption.

Official tax information

County, state and national effective rates
San Mateo County, CA
0.61%
California
0.70%
United States
0.94%

Each rate is median annual taxes ÷ median home value for that area. These historical survey ratios are not tax rates set by law or averages of county rates. Displayed rates are rounded; calculations use the unrounded ratio.

San Mateo County, CA: math and Census sources

$9,519 median annual taxes ÷ $1,559,600 median home value = 0.61%. Census ACS 2020–2024.

Sources. Checked Oct 24, 2026.

Median home value
0500000US06081|1559600|16159

Official source. Checked Oct 24, 2026.

Median annual taxes
0500000US06081|9519|153|10001|-333333333|6502|199

Official source. Checked Oct 24, 2026.

Effective rate calculation
0500000US06081|9519|153|10001|-333333333|6502|199

Official source. Checked Oct 24, 2026.

California: math and Census sources

$5,124 median annual taxes ÷ $734,700 median home value = 0.70%. Census ACS 2020–2024.

Sources. Checked Oct 24, 2026.

Median home value
0400000US06|734700|1307

Official source. Checked Oct 24, 2026.

Median annual taxes
0400000US06|5124|17|5839|17|3825|19

Official source. Checked Oct 24, 2026.

Effective rate calculation
0400000US06|5124|17|5839|17|3825|19

Official source. Checked Oct 24, 2026.

United States: math and Census sources

$3,119 median annual taxes ÷ $332,700 median home value = 0.94%. Census ACS 2020–2024.

Sources. Checked Oct 24, 2026.

Median home value
0100000US|332700|236

Official source. Checked Oct 24, 2026.

Median annual taxes
0100000US|3119|4|3489|4|2576|4

Official source. Checked Oct 24, 2026.

Effective rate calculation
0100000US|3119|4|3489|4|2576|4

Official source. Checked Oct 24, 2026.

Survey estimates have sampling error and do not account for your parcel’s assessment, taxing districts or exemptions. Estimation methodology.

Due dates for San Mateo County, CA

First secured installment: November 1, 2026 (Set by law). Last day to pay without a penalty: December 10, 2026.

Installment label
§ 2605 Rev. & Tax. Code November 1 Property owners First installment of real property taxes and all taxes on personal property on the secured roll are due and payable.

Official source. Set by law Checked Oct 24, 2026.

Published due date
§ 2605 Rev. & Tax. Code November 1 Property owners First installment of real property taxes and all taxes on personal property on the secured roll are due and payable.

Official source. Set by law Checked Oct 24, 2026.

Payment cutoff and exact wording
§§ 2617 and 2704 Rev. & Tax. Code December 10 Property owners First installment of taxes on the secured roll, if unpaid, is delinquent at 5:00 p.m. or close of business day, whichever is later.

Official source. Set by law Checked Oct 24, 2026.

Second secured installment: February 1, 2027 (Set by law).

Installment label
§ 2606 Rev. & Tax. Code February 1 Property owners Second installment real property taxes due and payable.

Official source. Set by law Checked Oct 24, 2026.

Published due date
§ 2606 Rev. & Tax. Code February 1 Property owners Second installment real property taxes due and payable.

Official source. Set by law Checked Oct 24, 2026.

County dates and official payment links. Dates are published dates, not a statement of your account balance.

Exemptions you may be missing (2 programs in our records)

Exemptions you may be missing

Sources. Checked Oct 24, 2026.

Check the exemptions that may fit. A “Yes” does not confirm eligibility; your assessor makes that decision.

Homeowners' Exemption

Qualifying owners whose home is their principal residence on January 1.

Does this describe you?
Possible annual savings Answer above

We’ll show the next step for this exemption.

Estimate only. Not tax, legal or financial advice; confirm with your county.

Official eligibility and application

Eligibility source
The California Constitution provides a $7,000 reduction in the taxable value for a qualifying owner-occupied home. The home must have been the principal place of residence of the owner on the lien date, January 1st.

Official source. Officially published Checked Oct 24, 2026.

Savings source
To claim the exemption, the homeowner must make a one-time filing with the county assessor where the property is located. A person filing for the first time on a property may file anytime after the property or claimant becomes eligible, but no later than February 15 to receive the full exemption for that year.

Official source. Officially published Checked Oct 24, 2026.

Disabled Veterans' Exemption

Qualifying veterans rated or compensated at 100% for service-connected disability, or qualifying unmarried surviving spouses; principal residence required.

Does this describe you?
Possible annual savings Answer above

We’ll show the next step for this exemption.

Estimate only. Not tax, legal or financial advice; confirm with your county.

Official eligibility and application

Eligibility source
The Disabled Veterans' Exemption reduces the property tax liability on the principal place of residence of qualified veterans who, due to a service-connected injury or disease, have been rated 100% disabled or are being compensated at the 100% rate due to unemployability. An unmarried surviving spouse of a qualified veteran may also claim the exemption.

Official source. Officially published Checked Oct 24, 2026.

Savings source
the claim form must be filed between the date of the eligibility event and on or before the following January 1, or 90 days after the date of the eligibility event, whichever is later. The claim form must be filed annually between January 1 and on or before February 15.

Official source. Officially published Checked Oct 24, 2026.

Full-year marginal estimates before tax ceilings, special charges or mid-year changes. Enter the taxable value before this exemption to avoid subtracting it twice. Estimates are separate. Do not add them together; eligibility, taxing units and restrictions can overlap.

Late payment penalty

Late payment penalty

Sources. Checked Oct 24, 2026.

Not available yet

A complete penalty rule and its payment deadline have not been verified here.

Estimate only. Not tax, legal or financial advice; confirm with your county.

Check the official information

Source details
A 10% penalty is added the next day A 10% penalty plus $40.00 cost is added the next day A redemption fee of $35.00 and a monthly penalty of 1.5% will be added to Secured defaulted parcels If a delinquent date falls on a weekend or holiday, the delinquent date is the next business day.

Official source. Officially published Checked Oct 24, 2026.

Is my assessment too high?

Is my assessment too high?

Use market value, not assessed or taxable value.

Compared with the county median At the median

This compares market values only; being above the county median does not establish overassessment.

Estimate only. Not tax, legal or financial advice; confirm with your county.

Official appeal information

Sources. Checked Oct 24, 2026.

Census survey, 2020–2024. Rate = median annual taxes ÷ median home value.

Census home value source
0500000US06081|1559600|16159

Official source. Checked Oct 24, 2026.

Census taxes paid source
0500000US06081|9519|153|10001|-333333333|6502|199

Official source. Checked Oct 24, 2026.

Appeal dates and filing

Published appeal window: July 2, 2026 through November 30, 2026.

How to file: San Mateo County Assessment Appeals Board, 500 County Center, 5th Floor, BOS 104, Redwood City, CA 94063

State guidance: File the county's Assessment Appeal Application (BOE-305-AH) with the clerk of the board in the county where the property is located.

Official appeal source. Last verified 2026-10-24.

Official appeal source. Last verified 2026-10-24.

Official appeal source. Last verified 2026-10-24.

Official appeal source. Last verified 2026-10-24.

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    Starts at the county’s Census median: $1,559,600. Change it to your best estimate.

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    What's next for you

    San Mateo County, CA

    Due date:

    Official source

    Set by law. Verified October 24, 2026.

    § 2605 Rev. & Tax. Code November 1 Property owners First installment of real property taxes and all taxes on personal property on the secured roll are due and payable.

    Check the official source

    Add to calendar Remind me

    Updated , from cited verification dates. Individual sources may have earlier checks.