California Sales Tax Law: Nexus, Permits, and Use Tax

California sales tax applies to most retail sales of physical goods, with a statewide base rate of 7.25% that climbs above 10% in some areas once local district taxes are added.1California Department of Tax and Fee Administration. California City and County Sales and Use Tax Rate Information If your business sells tangible goods to customers in the state, you generally need a seller’s permit from the California Department of Tax and Fee Administration (CDTFA), you charge the rate that applies at the location of the sale, and you file returns on the schedule the CDTFA assigns you. The rules around exemptions, shipping, use tax, and nexus are where most businesses get tripped up.

What’s Taxable and What Isn’t

Revenue and Taxation Code (RTC) 6051 imposes sales tax on gross receipts from retail sales of physical goods.2California Legislative Information. California Code RTC 6051 – Imposition of Tax The definition of a “sale” under RTC 6006 is broad enough to include barters, trade-ins, exchanges, and most leases, so a transaction can create tax liability even when no cash changes hands.3California Legislative Information. California Code RTC 6006 – Sale

When a sale mixes goods and services, RTC 6012 treats bundled service charges as part of the taxable amount. Installation labor and similar work can be excluded if you separately state the charge on the invoice.4California Department of Tax and Fee Administration. California Code RTC 6012 – Gross Receipts Sell a custom-printed banner with the design work itemized on its own line and that design charge may escape tax; roll everything into one lump price and the whole amount is taxable.

Several categories are exempt from sales tax:

One boundary worth knowing: purely electronic transfers of software, e-books, apps, and digital images are not taxable when no physical component is included.10California Department of Tax and Fee Administration. Internet Sales Publication 109 – Nontaxable Sales Add a flash drive, printed copy, or disk and the entire sale becomes taxable, not just the physical item. California does not currently tax software-as-a-service or cloud-based software accessed entirely online.

Shipping and Delivery Charges

Whether your shipping charges are taxable depends on how you label them and what records you keep. Charges called “shipping,” “delivery,” “freight,” or “postage” can be nontaxable if you document the actual cost of each shipment. Handling charges are always taxable.11California Department of Tax and Fee Administration. Shipping and Delivery Charges Publication 100

If you don’t keep records showing the actual cost of an individual delivery, the entire delivery charge becomes taxable when it’s tied to a taxable sale. Keep freight invoices, bills of lading, parcel receipts, or carrier records to back up any shipping deductions.

Resale Certificates

Businesses buying goods to resell can give a resale certificate to their supplier under RTC 6091, which shifts the tax obligation to the eventual retail sale.12California Legislative Information. California Code RTC 6091 – Presumption of Taxability and Resale Certificate Using a resale certificate on items the business actually consumes rather than resells is one of the most common audit triggers.

The burden of proof falls on the seller who accepted the certificate. If the sale is questioned, that seller has to show it was reasonable to believe the goods were for resale. At a minimum, verify the buyer’s permit number is active before accepting a certificate.

When You Have to Collect: Nexus

You only need to collect California sales tax if your business has a sufficient connection with the state. California recognizes two kinds.

Physical nexus arises under RTC 6203 when a business maintains an office, warehouse, sales room, or any other place of business in California. Having employees, independent contractors, or sales representatives in the state also creates nexus.13California Department of Tax and Fee Administration. California Code RTC 6203 – Collection by Retailer

Economic nexus applies regardless of physical presence. Under RTC 6203(c)(4), any retailer — including all related parties combined — with more than $500,000 in total sales of physical goods delivered into California in the current or preceding calendar year must register and collect tax. The requirement covers all sales channels: website, catalog, phone, or otherwise.14California Department of Tax and Fee Administration. Use Tax Collection Requirements Based on Sales into California Due to the Wayfair Decision

Marketplace facilitators — platforms connecting buyers with third-party sellers — have their own collection obligations under RTC 6041. When Amazon, eBay, Etsy, or a similar platform meets the economic nexus threshold, it collects and remits tax on behalf of its sellers.15California Legislative Information. California Code RTC 6041 – Marketplace Facilitator Definitions If you sell only through one of these platforms, the platform generally handles collection, but verify it is actually happening. Sellers stay on the hook if the facilitator drops the ball.

Use Tax: The Obligation Businesses Miss

Use tax is the counterpart to sales tax. When you buy physical goods for use in California and the seller doesn’t charge sales tax, often because the seller is out of state, you owe use tax directly to the CDTFA at the rate sales tax would have applied. RTC 6201 imposes this tax on the storage, use, or consumption of goods purchased from any retailer.16California Department of Tax and Fee Administration. California Code RTC 6201 – Imposition of Use Tax

Common triggers include office supplies bought from an out-of-state vendor who doesn’t collect California tax, equipment ordered online from a seller without California nexus, and items pulled from resale inventory for the business’s own use. You self-assess and remit use tax on the regular sales and use tax return. Businesses that overlook use tax face large assessments during audits because the liability accumulates quietly over years.

Getting a Seller’s Permit

Any business selling physical goods in California must obtain a seller’s permit from the CDTFA before making taxable sales. RTC 6066 requires an application for each place of business, listing the business name, location, and other details.17California Legislative Information. California Code RTC 6066 – Permits You can apply online through the CDTFA website or in person. There is no fee for a standard seller’s permit.

Under RTC 6067, each business location receives its own permit, which must be displayed prominently at the premises.18California Legislative Information. California Code RTC 6067 – Permits Permits are not transferable — if you buy an existing business, you need your own. The CDTFA also issues temporary permits for short-term events like trade shows and seasonal markets. Remote sellers who cross the $500,000 economic nexus threshold must register even without any physical presence.

Filing and Paying

Once registered, you file sales and use tax returns on a schedule the CDTFA assigns. RTC 6451 sets quarterly filing as the default, with returns due by the last day of the month after each quarter.19California Legislative Information. California Code RTC 6451 – Returns and Payments RTC 6455 gives the CDTFA authority to assign monthly, annual, or other filing periods based on your tax liability.20California Legislative Information. California Code RTC 6455 – Filing Periods Higher-volume businesses file more frequently; lower-volume ones may file annually.

Each return reports gross sales, taxable sales, applicable deductions and exemptions, and tax owed. A late return triggers a penalty of 10% of the tax due.21California Department of Tax and Fee Administration. California Code RTC 6591 – Interest and Penalties

Businesses whose average monthly tax liability reaches $10,000 or more must remit payments through electronic funds transfer.22California Department of Tax and Fee Administration. California Code RTC 6479.3 – Electronic Funds Transfer Payments Those averaging $17,000 or more per month must also make prepayments during the quarter under RTC 6471, paying estimated tax in advance before the full quarterly return is due.23California Department of Tax and Fee Administration. California Code RTC 6471 – Prepayment

Records, Audits, and Penalties

RTC 7054 gives the CDTFA broad authority to examine a business’s books, records, and equipment.24California Legislative Information. California Code RTC 7054 – Examination of Records Audits typically cover three years, but the CDTFA can look back up to eight years if no return was filed, and there is no time limit when fraud is involved.

Keep sales receipts, invoices, resale certificates, exemption documentation, shipping records, and filed tax returns for at least four years. When the CDTFA audits a business with incomplete records, it can issue an estimated assessment from whatever information is available, and those estimates run higher than actual liability would have been.

Penalties escalate with severity:

Interest accrues on all unpaid balances and compounds over time.

If you receive a Notice of Determination after an audit, you have 30 days from the issue date to either pay the billed amount or file a petition for redetermination if you disagree. Missing that window triggers an additional 10% penalty on top of the assessed tax.29California Department of Tax and Fee Administration. Managed Audit Program Publication 53 Consult a tax professional before the deadline passes if the assessment is significant.

Buying an Existing Business: Successor Liability

Buying an existing California business carries a tax risk many buyers miss. Under RTC 6811, if the previous owner has unpaid sales tax, the buyer becomes personally liable for those debts up to the amount of the purchase price.30California Department of Tax and Fee Administration. California Code RTC 6811 – Withholding by Purchaser The law requires the buyer to withhold enough of the purchase price to cover any outstanding tax until the former owner produces a clearance certificate from the CDTFA.

Liability extends to all unpaid taxes from the predecessor or any former owner, including interest and penalties that accrued before the sale.31Legal Information Institute. California Code of Regulations Title 18 Section 1334 – Successor Liability Request a tax clearance certificate from the CDTFA before closing. If the CDTFA does not issue the certificate or notify you of the amount owed within 60 days, you’re released from the withholding obligation. Skip this step and you could end up paying someone else’s back taxes out of pocket with no practical way to recover the money.