Measure B: What a Half-Cent San Diego County Sales Tax Would Mean for Your Business

What is on the ballot

Measure B is a citizens' initiative on the November 3, 2026 ballot that would add a half-cent (0.5 percent) countywide transactions and use tax to fund health and safety services, according to the measure text and analysis published by the San Diego County Registrar of Voters. Because it qualified as a citizens' initiative, the San Diego Foundation's nonpartisan voter guide explains that it needs only a simple majority to pass. The measure has no sunset date.

County estimates in the ballot materials put the revenue at roughly $400 million to $450 million a year. This article does not take a position on the measure. It explains what would change for businesses so you can plan for either result.

How rates would change

Sales tax in California is a stack: the statewide base rate plus local district taxes approved by voters. As of October 1, 2026, the CDTFA rate table lists 7.75 percent for unincorporated San Diego County and for cities without their own add-on, including San Diego, Carlsbad, Coronado, Encinitas, Poway and Santee. Several cities already add their own district taxes. A countywide measure would apply on top of the rate in every city and unincorporated area, so each local rate would rise by the half cent described in the ballot materials, subject to the state's limits on combined district taxes. CDTFA publishes the official rates before any new tax starts.

When it could take effect

District taxes in California start on the first day of a calendar quarter. The measure's materials describe an operative date on the first day of the first calendar quarter that begins more than 110 days after adoption. County election results are expected to be certified in early December 2026. If the measure passes and is adopted on that timeline, the rule points to a start in the spring of 2027, but the official date will come from CDTFA, which notifies registered sellers in advance. Watch for that notice rather than relying on an estimate.

Who in San Diego County it affects

The tax applies to retail sales of tangible goods delivered in the county and to the use of goods bought elsewhere and brought into the county. That reaches more businesses than retailers alone.

• Retailers and restaurants charging sales tax at the register or online
• Contractors, who often pay sales or use tax on materials they install
• Manufacturers, life science labs and tech companies buying equipment, furniture or supplies
• Businesses that buy from out-of-state vendors that do not collect California tax, which owe use tax
• Out-of-county and online sellers delivering into San Diego County, which collect the district tax based on the delivery address
• Every business as a buyer: the cost of taxable purchases rises by the same half cent

How California sales tax rules shape the impact

Services are generally not subject to California sales tax, so a professional services firm will mostly feel Measure B as a buyer. Product sellers, contractors and restaurants will feel it at the register. For sellers, the main operational work is updating point-of-sale and e-commerce systems so the right rate is charged on the operative date, and making sure the CDTFA return reports sales by the correct jurisdiction. Contracts with fixed prices that span the start date, and large purchases that are delivered after it, are the other areas to review with your CPA.

What to do before year end

No action is required until the vote is certified. A little preparation now avoids a scramble if the measure passes.

1. Confirm your POS, e-commerce platform and invoicing system can switch rates on a set date.
2. List large taxable purchases planned for 2027 and note the expected delivery dates.
3. Review fixed-price customer and supplier contracts that run into 2027.
4. Check that use tax is accrued on out-of-state purchases, which many growing companies miss.
5. Add the rate change to your 2027 budget and pricing review, and revisit it after certification.
6. Ask your CPA to confirm your CDTFA account is set up for every location where you deliver goods.

How Scalesight helps

Sales tax is part of the monthly close for many of our clients. Our accounting team keeps CDTFA filings current, and our fractional CFO work builds rate changes into pricing and cash forecasts. For the full picture of local rates and license rules in your city, see our San Diego County pages.

Sources

• Measure text and analysis: San Diego County Fund Health and Safety Services, San Diego County Registrar of Voters, 2026
• Measures list, November 3, 2026 Gubernatorial General Election, San Diego County Registrar of Voters, 2026
• Voter education FAQs, The San Diego Foundation, 2026
• California City and County Sales and Use Tax Rates (CDTFA-95), operative October 1, 2026, California Department of Tax and Fee Administration, October 1, 2026

This is general information, not tax or legal advice. Tax rules change and the right answer depends on your facts, so talk with a CPA before acting on it.