Napa County Sales Tax: Rates by City, Exemptions, and Filing

The Napa County sales tax ranges from 7.75% to 8.75% depending on which city you’re buying in, with the City of Napa carrying the highest rate as of 2026.¹ Every rate starts with California’s 7.25% statewide minimum and layers on voter-approved local taxes from there.

Rate by City

These combined rates took effect January 1, 2026:¹

City of Napa: 8.750%
St. Helena: 8.250%
American Canyon: 7.750%
Calistoga: 7.750%
Yountville: 7.750%
Unincorporated Napa County: 7.750%

The City of Napa’s rate climbed from 7.75% to 8.75% after voters approved Measure G in November 2024, adding a full cent to every taxable dollar spent inside city limits.² On a $30,000 purchase, that’s $300 more in tax than you’d pay in American Canyon or Yountville.

What Makes Up the Rate

California’s statewide minimum of 7.25% applies everywhere in the state.³ Everything above that comes from local measures approved by voters.

In most of Napa County, a countywide half-cent transportation tax (Measure U, which replaced Measure T on July 1, 2025) brings the total to 7.75%. Measure U is authorized for 30 years and funds road reconstruction, street rehabilitation, sidewalks, and ADA-accessible infrastructure.⁴⁵

On top of that, St. Helena adds its own half-cent, and the City of Napa adds Measure G’s full cent. Measure G is estimated to raise about $22 million a year earmarked for road maintenance, sidewalk repairs, park improvements, and public safety; collection began in April 2025.²

What Gets Taxed

California sales tax applies to retail sales of tangible personal property, meaning physical goods you can see, touch, or weigh.⁶ Clothing, electronics, furniture, building materials, and most retail merchandise all get taxed at the local rate.

Vehicles

When you buy a car, truck, or motorcycle, sales or use tax applies to the full purchase price. California does not let you subtract a trade-in before calculating tax. Buy a $40,000 vehicle and hand over an old car worth $15,000 plus $25,000 in cash, and you owe tax on the full $40,000.⁷ The rate is based on where you register the vehicle, not where the dealership sits. A City of Napa resident buying from a dealer in American Canyon pays 8.75%.

Restaurant and Prepared Food

Hot food is always taxable, whether you eat in or take it home. That includes anything grilled, microwaved, kept under heat lamps, or served from a steam table.⁸ Cold food is more complicated. Eat a cold sandwich at a restaurant’s tables and it’s taxable; order the same sandwich to go and it may not be.

The dividing line is California’s “80-80 rule.” At places where more than 80% of revenue comes from food and more than 80% of those food sales are already taxable, all food consumed on the premises is taxable, cold items included.⁸ That catches most sit-down restaurants and many fast-food locations. Cold food sold to go at a place that doesn’t hit both thresholds is generally exempt. Alcoholic beverages are always taxable.

Groceries, Prescriptions, and Services

Most food bought at a supermarket for home preparation is exempt. Fresh produce, meat, dairy, bread, and canned goods all qualify. The exemption disappears once food is sold heated, served as a meal, or eaten on the seller’s premises.⁹

Prescription drugs are exempt from both state and local sales tax.¹⁰ Repair labor, professional consulting, and other services where no physical product changes hands are generally not subject to sales tax. Fabrication labor (creating a new product) is taxable, though, even when charged separately.⁹

Nonprofits don’t get a blanket exemption. A 501(c)(3) selling merchandise at a fundraiser generally collects sales tax like any other retailer, with limited exceptions for certain charitable organizations.¹¹

Online and Out-of-State Purchases

When you buy something from outside California and the seller doesn’t collect California tax, you owe an equivalent “use tax” at the same rate that would have applied to a local purchase. Most large online marketplaces handle this for you. Under California’s Marketplace Facilitator Act, platforms like Amazon, eBay, and Etsy must collect and remit California sales tax on orders delivered into the state once their combined sales exceed $500,000 in the current or prior calendar year.¹²

For smaller out-of-state sellers or private-party purchases where no tax was collected, the responsibility is yours. You can report and pay use tax on your California income tax return (Form 540), due April 15 of the year after the purchase.¹³ If you don’t want to track every receipt, the CDTFA publishes a lookup table that estimates use tax on nonbusiness items under $1,000 each. Vehicles, boats, aircraft, and mobile homes can’t be reported this way and require separate filing with the CDTFA.

The rate is based on where you’ll use the item, not where the seller is located. A Napa County resident outside city limits pays 7.75%; a City of Napa resident pays 8.75%.¹⁴

If You Run a Business That Sells Goods

Any business in Napa County that sells or leases tangible goods needs a California seller’s permit before making its first sale. There’s no fee for the permit itself, though the CDTFA may require a security deposit against potential unpaid tax if you later close.¹⁵ You register online through the CDTFA portal. A seller’s permit is separate from your local business license; contact your city or county for that.

Operate at more than one physical location and you may need a separate permit for each. Pop-up shops, farmers market vendors, and event booths running 90 days or less at one location apply for a temporary seller’s permit instead of a standard one.¹⁵

Most businesses file quarterly. The 2026 deadlines are:¹⁶

Q4 2025: February 2, 2026
Q1 2026: April 30, 2026
Q2 2026: July 31, 2026
Q3 2026: November 2, 2026 (extended from October 31 due to weekend)

Higher-volume businesses also owe monthly prepayments on the 24th of the month following each prepayment period. When a deadline falls on a weekend or state holiday, it shifts to the next business day.

Any violation of the Sales and Use Tax Law not covered by a more specific penalty is a misdemeanor carrying a fine of $1,000 to $5,000, up to one year in county jail, or both.¹⁷ Filing a fraudulent return, or helping someone prepare one, carries the same range.¹⁸ The more common risk for a small business is a CDTFA audit covering several years of returns, with back taxes and interest piling up on top of any underreported amounts.

1
California Department of Tax and Fee Administration. California City and County Sales and Use Tax Rates
2
City of Napa. Measure G – Investing in Our Community
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California Department of Tax and Fee Administration. California City and County Sales and Use Tax Rate Information
4
NVTA. About Our Tax Measures
5
Napa County. File 24-1049
6
California Department of Tax and Fee Administration. California Revenue and Taxation Code 6016 – Tangible Personal Property
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California Department of Tax and Fee Administration. Tax Guide for Purchasers of Vehicles
8
California Department of Tax and Fee Administration. Regulation 1603
9
California Department of Tax and Fee Administration. Common Sales and Use Tax Nontaxable Sales and Partial Exemptions
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California Department of Tax and Fee Administration. Sales and Use Tax Regulations – Article 8
11
California Department of Tax and Fee Administration. Nonprofit/Exempt Organizations
12
California Department of Tax and Fee Administration. Tax Guide for Marketplace Facilitator Act
13
California Department of Tax and Fee Administration. California Use Tax for Personal Use
14
California Department of Tax and Fee Administration. Local and District Tax Guide for Retailers
15
California Department of Tax and Fee Administration. Obtaining a Seller’s Permit
16
California Department of Tax and Fee Administration. Sales and Use Tax
17
California Department of Tax and Fee Administration. Revenue and Taxation Code – Chapter 10 – Violations
18
California Department of Tax and Fee Administration. Revenue and Taxation Code 7152 – Criminal Penalties