Rate Breakdown

Property taxes in Riverside County are calculated by multiplying the assessed value (minus exemptions) by the total local millage rate.

How Property Tax Works in Riverside County

In Riverside County, property tax is calculated by applying the county’s millage rate to the assessed value of a parcel. The assessed value is determined on the date of acquisition (or the date of new construction) and is generally equal to the market value at that time. Once established, the assessed value can increase by no more than 2 % per year under California’s Proposition 13, unless the property undergoes a change in ownership, new construction, or a reassessment for a significant improvement.

The base millage rate for the county is set by the Board of Supervisors and is currently around 1.1 % (11 mills). Additional millage rates are added for cities, school districts, special districts, and voter‑approved indebtedness. The total combined rate for most residential properties in Riverside County falls between 1.1 % and 1.3 % of the assessed value, though commercial and industrial parcels can carry higher rates.

To calculate an estimate, multiply the assessed value by the total applied millage (expressed as a decimal). For example, a home with an assessed value of $350,000 and a combined rate of 1.2 % would owe $4,200 in annual property tax.

Available Exemptions

California law provides several exemptions that can reduce the taxable portion of a property’s assessed value. In Riverside County, the most common exemptions are:

• Homestead Exemption: Reduces the assessed value by up to $7,000 for owner‑occupied primary residences, lowering the tax bill by roughly $70–$90 annually.
• Senior Citizen Exemption (Property Tax Postponement): Homeowners 62 years or older may defer all or part of their property tax if they meet income and equity limits. The postponed amount accrues interest and is repaid when the property is sold or transferred.
• Disability Exemption (Property Tax Postponement): Similar to the senior program, disabled owners who meet eligibility criteria can postpone taxes.
• Veteran Exemption: Qualifying disabled veterans receive a $5,000 reduction in assessed value, with an additional $5,000 for those who are also surviving spouses.

All exemptions must be applied for through the Riverside County Assessor‑Recorder’s Office, typically by the February 15 deadline preceding the tax year.

Payment Schedule & Deadlines

Riverside County follows the statewide two‑installment system:

• First Installment: Due October 1; a 5 % penalty is added if paid after December 10.
• Second Installment: Due February 1; a 5 % penalty is added if paid after April 10.

Taxpayers may also elect to pay the full amount in a single payment by October 1, thereby avoiding both penalties. Late payments incur the statutory 5 % penalty per installment plus annual interest at the state base rate (currently 3 %). Persistent delinquency can result in tax‑sale proceedings, including a tax‑foreclosure auction.

Payments can be made online through the Riverside County Treasurer‑Tax Collector portal, by mail, or in person at any Treasurer‑Tax Collector office. Setting up automatic recurring payments is recommended to stay on schedule.

Appealing Your Assessment

If you believe your property’s assessed value is inaccurate, you have the right to appeal:

• File a Formal Appeal: Submit a written appeal to the Riverside County Assessment Appeals Board (AAB) by July 2 of the assessment year (the “deadline for filing”).
• Gather Evidence: Provide recent comparable sales, an independent appraisal, or documentation of any damage or improvements that affect value.
• Attend a Hearing: The AAB will schedule a hearing where you can present your case. You may be represented by a lawyer or a qualified property tax consultant.
• Decision & Further Review: The AAB issues a written decision within 30 days. If unsatisfied, you may petition the State Board of Equalization within 30 days of the AAB’s decision.

Timely filing and thorough documentation are essential for a successful challenge. The Riverside County Assessor’s Office also offers a preliminary “informal review” option before filing a formal appeal, which can resolve many disputes without a formal hearing.