How to Appeal Property Taxes in San Bernardino County, California (2026 Guide)

Direct answer: For the 2026 regular assessment roll in San Bernardino County, the appeal window is July 2, 2026 through Monday, November 30, 2026. File with the San Bernardino County Clerk of the Board of Supervisors / Assessment Appeals, not the Assessor, using the online appeal portal or a paper Assessment Appeal Application delivered to 385 N. Arrowhead Avenue, 2nd Floor, San Bernardino, CA 92415-0130.

The filing fee is $45 per application/parcel, unless you submit the county’s fee-waiver request with the application. Keep paying your tax bill while the appeal is pending; a successful appeal results in a corrected roll and refund process, not an excuse to miss the installment deadlines.

How assessments work in San Bernardino County

San Bernardino County’s 2026 assessment roll was signed and delivered in July 2026. The county reported 905,255 parcels and a total assessed value of $376,926,409,190. The roll reflects locally assessed real, business, and personal property as of the January 1 lien date.

For a typical home, the Assessor is not starting from scratch every year. Under Proposition 13, real property is generally assessed at the lower of current market value or adjusted base-year value. Your base-year value is usually set when you buy the home or complete new construction, and it can rise by no more than 2% per year unless there is a change in ownership or new construction. If the market value as of January 1, 2026 is below that Prop. 13 value, the issue is usually a regular assessment / decline-in-value appeal.

Important local distinction: the Assessor-Recorder-County Clerk sets the assessed value; the Treasurer-Tax Collector bills and collects taxes; and the Clerk of the Board runs the assessment appeal filing and hearing process. The Clerk and appeals boards are neutral and separate from the Assessor’s Office.

Whether you should appeal

Appeal only if you can support a lower value with evidence, not just because the bill feels high. For a 2026 regular decline-in-value appeal, you are arguing the market value of your property on January 1, 2026. San Bernardino County’s hearing brochure says comparable sales for a regular decline-in-value case should have closed before January 1, 2026, or no later than April 1, 2026.

Good evidence for a homeowner usually includes three to five comparable sales that are close in location, similar in size, age, condition, lot size, and property type. Bring a map showing where the comps are relative to your house. Adjust for obvious differences: pool/no pool, major renovation, view, acreage, garage count, or whether one property is in a different High Desert, mountain, or valley submarket.

Do not assume the appeal can fix everything on the bill. The appeals board decides value issues and some legal assessment issues, but it cannot decide whether you qualify for an exemption, and it cannot remove Tax Collector late-payment penalties. Also, if the board believes the evidence supports a higher value, it can decrease, increase, or leave the assessment unchanged.

San Bernardino County does not appear to publish a homeowner-specific success rate or median reduction for assessment appeals. The California BOE publishes county assessment-appeals activity categories, but that data is not the same as a median homeowner dollar reduction. Do not rely on “average reduction” claims from solicitations unless the company shows county-specific, current, verifiable results.

Step-by-step how to file

1. Look up the value you are appealing. Use your assessment notice or tax bill and identify the assessment number/APN, land value, improvement value, and total assessed value. Your application must include your opinion of value; leaving that blank can cause rejection.

2. Try the Assessor first, but do not miss the appeal deadline. The county tells owners to contact the Assessor’s Office first to discuss the valuation and request revaluation. That informal contact does not extend the formal deadline. If November 30 is approaching, file the appeal to preserve rights.

3. Use the correct form. The official form is the Assessment Appeal Application, California form BOE-305-AH, as adapted for San Bernardino County. For 2026 regular appeals, use the county portal’s Submit a Regular Assessment Appeal option, or download the paper application from the Clerk’s Assessment Appeal Types page.

4. Choose the correct appeal type. For most homeowners disputing the 2026 annual roll, select Regular Assessment – value as of January 1 of the current year. Supplemental assessment appeals are different: they usually must be filed within 60 days of the supplemental notice mailing date or postmark date, whichever is later. Escape assessments are also generally 60 days. Calamity assessment appeals are generally within six months of the notice.

5. File by an accepted method. San Bernardino County accepts online filing through the Assessment Appeals portal. Paper applications must be received by the Clerk by mail or personal delivery. The local rules say applications must be received by mail, personal delivery, or online submission and that paper filings need an original signature; copies and facsimile filings are not accepted. Do not email or fax the initial Assessment Appeal Application unless the Clerk specifically tells you a separate document may be handled that way.

6. Pay the fee or include the waiver. The county requires a $45 non-refundable administrative processing fee for each application. Paper-payment instructions list cash or check/money order payable to the Clerk of the Board; returned payments incur a $25 fee. If you receive public assistance or cannot afford the fee, submit the Confidential Request for Waiver of Assessment Appeal Administrative Processing Fee with the application.

7. Send it to the right office. For paper filing, use: San Bernardino County Clerk of the Board of Supervisors, Assessment Appeals, 385 N. Arrowhead Avenue, 2nd Floor, San Bernardino, CA 92415-0130. The assessment appeals phone number is 909-387-4413; the Clerk lists Appeals@cob.sbcounty.gov for assessment-appeals questions.

What happens after

The appeal authority is the San Bernardino County Assessment Appeals Board. The Board of Supervisors appoints Assessment Appeals Board members, Legal Hearing Officers, and Value Hearing Officers. San Bernardino County maintains Assessment Appeals Boards 1, 2, 3, and 4, each with three members; hearing officers may individually hear qualifying cases.

The Clerk assigns an appeal number, reviews the application, and sends a letter verifying the application is complete, requesting more information, or denying it. The county’s process page says that review letter is sent within 12 months of filing. A notice of scheduled hearing is sent at least 45 days before the hearing, and the hearing and decision are expected within 24 months of filing unless the case is continued or postponed.

For many homeowners, a Value Hearing Officer is an option. The county form instructions say a single-family dwelling, condominium, townhouse, residential multi-family property of four or fewer units, or an appeal with roll value under $500,000 may request a Hearing Officer. But note the tradeoff: findings of fact are unavailable and waived for a hearing-officer case, and the hearing officer’s decision is final.

At the hearing, both sides present evidence. If the property is your primary residence, the Assessor bears the burden of proof and presents first. Bring the required copies of your evidence: the county hearing brochure says 5 sets for an Appeals Board hearing and 3 sets for a Hearing Officer hearing. Hearings are recorded, each side may question the other side, and the board or hearing officer may announce the value decision or take the case under submission.

There is also a non-oral path: the county’s Hearing Response Form lets you confirm attendance, request postponement, withdraw, or waive appearance. A waiver of appearance allows the hearing to proceed without you, but use it carefully; if your evidence needs explanation, appearing is usually safer.

Local tips

Check exemptions before spending time on an appeal. The Homeowners’ Exemption reduces taxable value by $7,000, saving about $70 per year, if you own and occupy the home as your principal residence as of January 1. The 2026 roll release says 219,368 San Bernardino County homeowners received it, saving more than $15.3 million countywide. A 100% service-connected disabled veteran, or qualifying unmarried surviving spouse, should review the Disabled Veterans’ Exemption; the county reported 7,628 disabled veterans qualified on the 2026 roll, receiving over $13 million in savings.

A worked example: say your 2026 assessed value is $540,000, but three good nearby sales support $500,000 as of January 1, 2026. If the board agrees, the taxable value drops by $40,000. San Bernardino County’s countywide general property tax rate is 1.00000000%, so the base-tax savings are $400. If the parcel is also in San Bernardino Unified (0.08169816%) and San Bernardino Community College (0.04989275%), those listed ad valorem components total 1.13159091%, making the annual savings about $453 before considering parcel-specific direct charges that may not change with assessed value.

Finally, if you mail close to the deadline, ask the USPS counter for a manual postmark. San Bernardino County warned in 2026 that postmark timing can matter for deadline-sensitive county filings, especially in High Desert, mountain, and remote communities.