Riverside County Tax Rates: Property, Exemptions, and Sales Tax

Riverside County tax rates start with a property tax base of 1% of assessed value, set by Proposition 13. Once voter-approved bond debt and local assessments are added, most owners pay between roughly 1.05% and 1.25% of assessed value, and properties inside newer Mello-Roos districts pay meaningfully more. Sales tax runs 7.75% in unincorporated parts of the county, 8.75% in most incorporated cities including Riverside, Corona, Temecula, Murrieta, and Moreno Valley, and 9.25% in Cathedral City and Palm Springs.¹

The 1% Property Tax Base and What Adds to It

California Constitution Article XIII A, Section 1 caps the ad valorem tax on real property at 1% of full cash value.² The Riverside County Treasurer-Tax Collector describes it as “$1 per $100 of assessed value.”³ The county collects the money and distributes it to school districts, cities, and special districts.

Your actual ad valorem rate will run higher than 1% because Proposition 13 allows voter-approved bonded debt to be added on top. School districts, community college districts, and other local agencies issue bonds for construction and infrastructure, and repayment costs get built into your rate.² How much extra depends on how many overlapping bond measures cover your parcel. The Riverside County Auditor-Controller publishes tax rate area breakdowns each fiscal year for the exact percentage on any parcel.⁴

Mello-Roos Special Taxes

Below the ad valorem section of your tax bill sits a list of flat-rate charges and special assessments for services like street lighting, landscaping, flood control, and waste collection. In newer Riverside County developments, one line often stands out: the Mello-Roos special tax. Under the Mello-Roos Community Facilities Act of 1982, local agencies create Community Facilities Districts to finance roads, parks, schools, and fire stations through annual special taxes recorded as liens against each property in the district.⁵ These charges can add hundreds or thousands of dollars each year and do not shrink when property values drop. Sellers must disclose them, but the amounts still surprise buyers who plan around the 1% base alone.

PACE Assessments

Property Assessed Clean Energy (PACE) financing lets homeowners fund energy-efficiency upgrades or solar installations through an assessment added to the property tax bill, with a lien recorded until the contract is paid off.⁶ Because the payment rides on the tax bill, falling behind can lead to the same consequences as unpaid property taxes. A PACE lien can also complicate refinancing or selling, since some mortgage lenders will not approve a loan on a home carrying one.

How Your Assessed Value Is Set

Your tax bill is a product of two numbers: the rate, and the assessed value the rate is applied to. Proposition 13 controls both sides.

When you buy a property or complete new construction, the county assessor sets the value at current market price. That figure becomes the base year value. In every year that follows, the assessed value can rise by no more than 2%, no matter how fast the market moves. Revenue and Taxation Code Section 51 sets out the mechanics: the assessor compares the inflation-adjusted base year value to current market value, and you are taxed on whichever is lower.²

This is why a long-time owner in Riverside County often pays much less than a neighbor who bought recently. A home purchased in 2005 for $350,000 might still carry an assessed value under $500,000 even if it would sell today for $650,000.

The value resets to market when the property changes hands. New construction triggers a reset too, but only on the value of the new improvements. After a sale or new construction, the county issues a supplemental tax bill covering the difference between the old and new assessed values for the remaining months of the fiscal year. If you buy in October, the higher tax amount applies from November through the following June, prorated by month.⁷ Changes between January and May produce two supplemental bills: one for the rest of the current fiscal year, another for the entire next one. These bills go directly to the property owner, not the mortgage servicer, so an escrow account will not pay them automatically.

Exemptions That Reduce What You Pay

Two exemptions cut the assessed value the county taxes. Both require a claim filed with the Riverside County Assessor.

Homeowner’s Exemption

Owning and occupying a home as your primary residence qualifies you for a $7,000 reduction in taxable value under the California Constitution. At the 1% base, that saves about $70 a year, a bit more once bond rates are counted.⁸ File form BOE-266 with the county assessor; it is a one-time filing, due by February 15 for the full exemption that tax year. Rentals, vacation homes, and vacant land do not qualify, and you cannot double up with the disabled veteran’s exemption on the same property.

Disabled Veteran’s Exemption

A veteran rated 100% disabled from a service-connected condition, or compensated at the 100% rate for individual unemployability, can claim a much larger reduction. California offers two tiers: a basic exemption reducing assessed value by roughly $180,000, and a low-income version reducing it by roughly $271,000. Both amounts adjust annually for inflation. File form BOE-261-G with the county assessor. The basic version is usually a one-time filing; the low-income version renews annually, generally by February 15.⁹ Unmarried surviving spouses may also qualify under certain conditions.

If Your Assessed Value Looks Too High

When market values fall, your assessed value can drop below the Proposition 13 base year value adjusted for inflation. Proposition 8 allows a temporary reduction in that situation.

The Riverside County Assessor accepts informal requests for review at no cost. The office encourages submission by May 15 so a request can be considered before the assessment roll closes, and accepts them through November 1.¹⁰ The question is whether market value on the January 1 lien date was lower than current assessed value. If the assessor agrees, the bill drops that year, then rises back up as the market recovers, capped at the Proposition 13 adjusted base year value.

If the informal review does not resolve the issue, you can file a formal appeal with the Riverside County Assessment Appeals Board between July 2 and November 30.¹¹ Miss that window and you wait for the next annual cycle. An informal Proposition 8 review does not extend the formal appeal deadline, so file the formal application before November 30 if you want to keep the option open.

Inherited Property and Proposition 19

If you expect to inherit Riverside County property and keep the old low tax bill, Proposition 19 has narrowed that option considerably. Before February 2021, a parent could transfer any property to a child without triggering reassessment. Now, the transferred property must be the child’s primary residence, and the child has to move in and claim a homeowner’s or disabled veteran’s exemption within one year of the transfer.¹²

Even where the residence rule is met, there is a value cap. The exclusion covers the existing assessed value plus an adjusted amount, currently $1,044,586 for transfers between February 16, 2025 and February 15, 2027. Market value above that combined limit gets added to the new owner’s assessed value.¹² The exclusion claim has to be filed within three years of the transfer. Inheriting a rental, a second home, or a family home you will not occupy now triggers full reassessment to current market value.

Payment Deadlines and Penalties

Riverside County property tax is paid in two installments. The first covers July through December, is due November 1, and becomes delinquent after December 10. The second covers January through June, is due February 1, and becomes delinquent after April 10.¹³

Miss a deadline and a 10% penalty is added immediately to the unpaid installment. The second installment carries an additional $38.06 administrative charge on top of the 10%. If taxes stay unpaid through June 30, the property enters tax-defaulted status, penalties accrue at 1.5% per month on the unpaid balance, and a $36.45 redemption fee is added. The county can hold defaulted property for up to five years before selling it at public auction.¹⁴

Sales and Use Tax

The base sales and use tax rate for unincorporated Riverside County is 7.75%, combining state and county levies. Most incorporated cities add district taxes on top, bringing the total to 8.75% in Riverside, Corona, Temecula, Murrieta, and Moreno Valley. Cathedral City and Palm Springs run higher at 9.25%.¹ The applicable rate follows the transaction location or delivery point, not the buyer’s home address.

Buying from an out-of-state seller who does not collect California sales tax leaves you owing use tax at the same rate that would have applied locally. Report it on your California income tax return; the instructions include a worksheet and a lookup table tied to adjusted gross income.¹⁵ Most people owe little, since major online retailers now collect California sales tax at checkout, but high-value purchases from private sellers or non-collecting vendors can add up.

1
California Department of Tax and Fee Administration. California City and County Sales and Use Tax Rates
2
California Legislative Information. California Constitution Article XIII A
3
Office of the Treasurer-Tax Collector, Riverside County, California. Current Secured Property Tax Information
4
Auditor Controller County of Riverside. Property Tax – Tax Rates
5
California Legislative Information. California Government Code 53321 – Proceedings to Establish a Community Facilities District
6
Department of Financial Protection and Innovation. PACE – Property Assessed Clean Energy: What Homeowners Need to Know
7
California State Board of Equalization. Supplemental Assessment
8
California State Board of Equalization. Homeowners’ Exemption
9
California State Board of Equalization. Disabled Veterans’ Exemption
10
County of Riverside, CA. Riverside County Reminds Property Owners of Proposition 8 Review Opportunity Ahead of Assessment Roll Close
11
Riverside County Assessor-County Clerk-Recorder. Important Dates
12
California State Board of Equalization. Proposition 19 Fact Sheet
13
Office of the Treasurer-Tax Collector, Riverside County, California. Property Tax Deadline for Riverside County Property Owners
14
Office of the Treasurer-Tax Collector, Riverside County, California. Redemption Information
15
California Department of Tax and Fee Administration. California Use Tax, Good for You. Good for California