What is the sales tax rate in Ontario, California?

The combined sales tax rate in Ontario, California is 10.100% as of 2026. This includes the California state rate of 7.300% plus local jurisdiction taxes.

How is the Ontario sales tax calculated?

Multiply your purchase amount by 10.100% (or 0.01010) to get the tax owed. For example, a $100 purchase incurs $10.10 in sales tax.

What is the California state sales tax rate?

The base California state sales tax rate is 7.300%. Local jurisdictions may add additional taxes on top of this rate.

Does Ontario have a county sales tax?

Ontario imposes an additional county-level sales tax of 0.300% on top of the state rate.

When was the Ontario sales tax rate last updated?

The Ontario sales tax rate was last verified on March 27, 2026. We cross-reference all rates against the official State Department of Revenue data.

Live Data: April 2026

Ontario, CA Sales Tax Rate 2026

The combined sales tax rate in Ontario, California is 10.100%.

Combined Rate 10.100%

State7.300% County0.300% City1.100%

Ontario Sales Tax Breakdown

Jurisdiction	Rate
California State Sales Tax	7.300%
County Sales Tax	0.300%
City / Municipal Tax	1.100%
Special District Tax	1.500%
Total Combined Rate	10.100%

Which County Is Ontario In?

Ontario falls within San Bernardino, California. San Bernardino imposes a 0.300% county-level sales tax in addition to the California state base rate.

Ontario ZIP Codes

The following ZIP codes are mapped to Ontario for sales tax purposes. All listed codes apply the 10.100% combined rate.

91761 91762 91764

Nearby Tax Rates

Combined Rate

Combined Rate

Combined Rate

Business Nexus in California

Economic Nexus Threshold

Selling into California from out of state? Once you exceed $500,000 in annual sales or 0 transactions, you must register and collect California sales tax.

FAQ: Ontario Sales Tax

The combined sales tax rate in Ontario, California is 10.100% as of 2026.

Multiply your purchase price by 10.100% to find the tax owed. A $500 purchase would include $50.50 in sales tax.

Groceries are generally taxable in California. Check the official Department of Revenue for specific exemptions.

Vehicle purchases in Ontario are subject to the 10.100% combined rate, though some states apply different rules for vehicle sales. Verify with the California Department of Revenue or DMV.

Register for a sales tax permit through the official California Department of Revenue website. Registration is typically free and required before collecting any sales tax.

Sales Tax Calculator

Using 10.100% rate for Ontario, CA

Purchase Amount ($)

Tax Amount $0.00

Total with Tax $100.00

Rate applied: 10.100% combined

Official Tax Authority

California Department of Tax and Fee Administration

Filing Deadline: Returns due the last day of the month following the reporting period. File via CDTFA Online Services.

Visit Official Portal (800) 400-7115