The Contra Costa County sales tax starts at a countywide minimum of 8.75 percent, but most purchases are taxed higher because cities add their own voter-approved rates on top. The ceiling right now is 10.25 percent in El Cerrito and Pinole. The rate that actually applies to any sale is tied to the address where you take possession of the goods, not where you live, so the same item can carry different tax depending on which city you buy it in.
Current Rates by City
As of 2026, here is how the total sales and use tax rate breaks down across the county’s incorporated cities:1California Department of Tax and Fee Administration. California City and County Sales and Use Tax Rates
- 10.25%: El Cerrito, Pinole
- 9.75%: Antioch, Concord, Martinez, Moraga, Orinda, Richmond, San Ramon
- 9.50%: San Pablo
- 9.25%: Hercules, Lafayette, Pittsburg, Pleasant Hill, Walnut Creek
- 8.75%: Brentwood, Clayton, Danville, Oakley
Unincorporated areas that don’t fall within any city default to the 8.75 percent county rate. These numbers shift whenever a local measure takes effect or expires, so for a specific address the CDTFA runs a lookup tool at maps.cdtfa.ca.gov that returns the current rate.2California Department of Tax and Fee Administration. Find a Sales and Use Tax Rate The agency also publishes a list of every active district tax with its operative and sunset dates for businesses tracking upcoming changes.3California Department of Tax and Fee Administration. Active District Tax Rates with Operative and Sunset Dates
Why the Rate Varies
California’s statewide minimum is 7.25 percent, which combines the state general fund rate, a portion dedicated to local public safety, and the Bradley-Burns local allocation that flows back to the city or county where the sale occurs.4California Department of Tax and Fee Administration. California City and County Sales and Use Tax Rate Information Contra Costa County voters have layered 1.5 percent in district taxes on top of that floor, which produces the countywide 8.75 percent minimum.1California Department of Tax and Fee Administration. California City and County Sales and Use Tax Rates Individual cities then add their own voter-approved transaction and use taxes, which is why the final number varies from one side of the county to the other.
What’s Taxable and What’s Exempt
Sales tax applies to retail sales of tangible personal property, meaning physical items you can touch.5California Franchise Tax Board. What Is Taxable Pure services, like hiring an accountant or a house cleaner, are not taxed. The confusion usually shows up at the edges, where goods and services mix.
Groceries and Prepared Food
Most grocery items sold for home preparation are exempt, including fruit, vegetables, meat, bread, and dairy.6California Legislative Information. California Revenue and Taxation Code 6359 The exemption ends the moment food is served as a meal or sold hot. A cold deli sandwich at a grocery store is generally exempt; the same sandwich grilled hot is taxable. Food sold with plates, utensils, or at tables provided by the seller is also taxable. Restaurants that get more than 80 percent of their revenue from food may owe tax on nearly everything they sell, including cold items, under what is known as the 80-80 rule.7California Department of Tax and Fee Administration. Regulation 1603
Prescription Medicine
Prescription medications and certain medical devices are exempt.5California Franchise Tax Board. What Is Taxable Over-the-counter drugs do not qualify. Only items dispensed by prescription are exempt.
Repair and Installation Labor
Charges for repair labor and installation labor are generally not taxable when itemized separately on the invoice.8California Department of Tax and Fee Administration. Publication 108 – Nontaxable Charges Replacement parts used in a repair are taxable at their retail value. When parts come to more than 10 percent of the total bill, the repair shop has to break out parts and labor on the invoice so tax applies only to the parts.9California Department of Tax and Fee Administration. Sales and Use Tax Regulations – Article 5 – Section: Regulation 1546 Lumping them together can result in tax being applied to the entire bill.
Use Tax on Out-of-State Purchases
When you buy something from an out-of-state retailer that doesn’t collect California sales tax, whether online, by phone, or while traveling, you owe use tax at the same rate that would have applied if you had bought it locally. The easiest way for individuals to report it is on the California state income tax return, which includes a worksheet and lookup table for estimating what’s owed. Businesses that accumulate more than $10,000 in purchases subject to use tax in a calendar year, excluding vehicles, vessels, and aircraft, must register separately with the CDTFA as a qualified purchaser.10California Department of Tax and Fee Administration. California Use Tax
Seller’s Permits and Collection Rules
Any business that sells or leases tangible personal property in California needs a seller’s permit from the CDTFA before making its first sale. The permit itself is free, though the agency can require a security deposit against potential unpaid tax if the business later closes.11California Department of Tax and Fee Administration. Obtaining a Seller’s Permit The requirement covers sole proprietors, corporations, LLCs, partnerships, and wholesalers alike.12California Department of Tax and Fee Administration. Your California Seller’s Permit Registration runs through the CDTFA website; you’ll need a Social Security number or EIN, a government-issued ID, and a business email. Selling at a pop-up or event for fewer than 90 days calls for a temporary seller’s permit, or a sub-permit if you already hold a permanent one.13California Department of Tax and Fee Administration. Temporary Sellers
Out-of-state retailers aren’t exempt from Contra Costa rates. Any remote seller whose sales of tangible goods delivered into California exceed $500,000 in the current or preceding calendar year has to register with the CDTFA and collect at the rate for each buyer’s delivery address.14California Department of Tax and Fee Administration. Sales and Use Tax Law – Section 6203 If you sell exclusively through a marketplace platform such as Amazon, eBay, or Etsy, the marketplace facilitator generally collects and remits the tax for California deliveries, and you typically don’t need your own CDTFA registration. Those marketplace sales still count toward your $500,000 threshold if you also make direct sales.15California Department of Tax and Fee Administration. Tax Guide for Marketplace Facilitator Act
Filing, Penalties, and Interest
Returns are filed through the CDTFA’s online portal, and the agency assigns a filing frequency, monthly, quarterly, or yearly, based on sales volume.16California Department of Tax and Fee Administration. Online Services – File a Return Most small retailers file quarterly. Businesses whose estimated monthly tax liability averages $17,000 or more go on a quarterly prepayment schedule.17California Department of Tax and Fee Administration. Return Prepayments A business with customers in multiple Contra Costa cities needs to allocate tax to the correct district. Collecting 8.75 percent on a sale that actually occurred in a 9.75 percent zone leaves the business short, and the CDTFA will look for that difference in an audit.
Missing a filing deadline or underpaying triggers a flat 10 percent penalty on the unpaid tax, applied whether the return was late or filed on time with a short payment.18Justia Law. California Revenue and Taxation Code 6591-6597 – Article 6 Interest and Penalties Operating without a valid seller’s permit to avoid the tax can add another 50 percent penalty on top.19California Department of Tax and Fee Administration. Interest, Penalties, and Collection Cost Recovery Fee Interest runs on any unpaid balance from the original due date. For all of 2026, the CDTFA’s debit interest rate is 10 percent per year, applied as a monthly factor of 0.00833 for each month or partial month the tax remains outstanding.20California Department of Tax and Fee Administration. Interest Rates That rate is adjusted semiannually.
Record Keeping
The CDTFA requires businesses to keep all sales and use tax records for at least four years, including invoices, receipts, resale certificates, exemption documentation, and point-of-sale data.21California Department of Tax and Fee Administration. Sales and Use Tax Records If your POS system overwrites data on a shorter cycle, export and preserve it separately before it’s lost. During an audit, appeal, or refund claim, hold records for the full matter even if it stretches past the standard four years. In a county like Contra Costa with overlapping district rates, the two issues auditors catch most often are misallocated district tax and missing resale certificates.