California sales tax nexus is the legal connection between your business and the state that requires you to register with the California Department of Tax and Fee Administration (CDTFA) and collect, report, and remit sales and use tax on your California transactions. That connection, known as “nexus,” can be created two ways: through a physical presence in the state, such as an office, warehouse, employee, or trade show booth, or through economic nexus, which is triggered once your combined California sales reach $500,000 in the current or prior calendar year. Because these rules apply to out-of-state retailers, drop shippers, and affiliates alike, understanding exactly what creates nexus, and how it affects the tax rate you must collect, is essential to avoiding registration penalties and costly CDTFA audits.
Key Takeaways
- California sales tax nexus is created either by physical presence (employees, offices, warehouses, inventory, trade shows, or affiliates) or by economic nexus, once combined California sales reach $500,000 in the current or prior calendar year.
- Once nexus exists, a business must register with the CDTFA and collect, report, and remit sales and use tax, including the 7.25 percent statewide base rate plus any applicable district taxes.
- Combined local sales tax rates vary by city and county and can exceed 10 percent in some California jurisdictions.
- California’s economic nexus threshold traces back to the U.S. Supreme Court’s 2018 Wayfair decision and California’s AB 147.
- Whether sales shipped out of state count toward the $500,000 threshold can depend on shipping terms and related-party sales, so borderline cases often warrant a professional review.
What Is Sales Tax Nexus in California?
Sales tax nexus is the level of connection between a business and a state that is substantial enough to require the business to collect and remit that state’s sales tax. Every state that imposes a sales tax, including California, sets its own legal standard for when an out-of-state or remote seller has crossed that line. In California, a business that meets the nexus standard is referred to as a “retailer engaged in business in this state” under Revenue and Taxation Code section 6203.
Physical Presence Nexus
Most businesses still trigger nexus the traditional way: by having some physical footprint in California, or by owning or leasing tangible personal property or real property within the state. That footprint can include:
- A salesperson or other employee
- A contractor or affiliate
- A location such as an office
- A warehouse or other inventory storage site
- Presence at an event such as a tradeshow
- Drop shipping from a third-party provider
What Does Not Create Nexus
If your only connection with a California customer is through one of the following, you have not established nexus on that basis alone:
- Common carrier or U.S. Postal Service delivery
- Phone calls, whether cell or landline
- Emails or other forms of electronic communication
- A website or web page accessed through an internet service provider or another access provider
- A click-through or other online advertisement providing a link to your website or web page
The one exception to this list: if your website or web page is stored on a server that you own or lease and that server is physically located in California, that server itself can establish nexus.
California law also uses a related term, “engaged in business,” which requires a “substantial” nexus with the state for purposes of the commerce clause of the U.S. Constitution. Historically, the meaning of “substantial” was open to debate, until California’s economic nexus threshold, discussed below, removed most of the ambiguity for high-volume sellers.
Economic Nexus: The $500,000 Threshold
Following the U.S. Supreme Court’s 2018 ruling in South Dakota v. Wayfair, Inc., which eliminated the requirement that a seller have a physical presence in a state before that state could require it to collect sales tax, California enacted AB 147. Under AB 147, a retailer is “engaged in business” in California, even without a single employee, warehouse, or office in the state, if its combined sales of tangible personal property delivered into California, together with sales by any related persons, exceed $500,000 in the preceding or current calendar year. Meeting this threshold requires the business to register with the CDTFA and collect state, local, and district use tax on its California sales, and it applies in every California tax district, regardless of where the retailer actually ships from.
Affiliate Nexus and Combined Reporting Groups
California law also examines exactly what “engaged in business” means on the state and local level. The definition of the phrase is rather convoluted; consultation with an attorney knowledgeable in California tax law could help you steer clear of any trouble.
Being engaged in business in California involves commonly controlled groups (corporations with shareholders) and combined reporting groups. A combined reporting group includes those corporations with business income that are permitted or required to be included in a particular combined report under the California Revenue and Tax Code unless specific criteria are met.
If a member of a retailer’s combined reporting group and commonly controlled group is performing services for the retailer within the State of California that helps the retailer establish or maintain a California market for sales of tangible personal property, that retailer has established a nexus. The same is true if the retailer has an affiliate operating in California that refers prospective customers to the retailer via an Internet-based link, an Internet website, or otherwise as defined under specific circumstances that can be found here.
Why Does Nexus Exist?
Nexus has been around in some form since taxes were invented, but the need for retailers from outside the state to collect and remit sales tax expanded each time a new selling innovation came along. Mail-order purchases expanded throughout the 20th century, joined by telephone sales, and then the biggest innovation of all: the internet.
State governments did not want to allow opportunities to pass by for collecting taxes and so needed to find a justification for requiring a business that was not incorporated in the state, nor had physical retail stores within its borders, to pay up. For decades, the U.S. Supreme Court’s 1992 decision in Quill Corp. v. North Dakota limited that reach to sellers with a physical presence in the state. The idea of a “sufficient presence” within the state in almost any form became the answer, until 2018, when the Court’s Wayfair decision overturned Quill’s physical presence rule entirely.
Because the definition of “sufficient presence” had already seemed vague, California and other states had taken a cue from the U.S. Constitution’s commerce clause and developed the concept of “engaging in business,” a standard that Wayfair and AB 147 later expanded to include economic activity alone. Legislation has continued to expand the types of out-of-state retailers required to register with the CDTFA, and the rules will keep changing as the way businesses sell continues to evolve.
How Nexus Affects Your Tax Obligations
If the CDTFA determines that you have the requisite “sufficient presence” and are “engaged in business” in the State of California, you must register your business with the CDTFA and begin collecting and remitting sales tax, even if you have nothing more than a drop-shipping hub or a booth at a trade show within the state’s borders.
You are not on the hook simply for the statewide rate, either. You are also responsible for local and district sales taxes, which vary from district to district, city to city, and county to county.
Example: Combined Sales Tax Rate in Beverly Hills (2026)
As of 2026, the combined sales tax rate in Beverly Hills is 9.75 percent. That rate is made up of:
- The statewide base rate of 7.25 percent (which itself includes the state rate plus the mandatory 1.25 percent local Bradley-Burns tax)
- Los Angeles County district taxes of 2.50 percent
If you have nexus in California, your business is responsible for knowing the current statewide rate, the rates for each of the state’s 58 counties, and the rates for hundreds of overlapping tax districts, since combined rates can top 11 percent in some cities.
Ongoing Compliance Costs
Your business bears the cost of compliance for filing, payment, and other activities involved in the administration of tax law, including:
- Audit costs
- Monitoring for changes in tax rates
- Exemption certificate management
- Company growth and expansion
Frequently Asked Questions
What is California’s economic nexus threshold?
A retailer has economic nexus in California once its combined sales of tangible personal property delivered into the state, including sales by related persons, exceed $500,000 in the current or preceding calendar year, per California’s AB 147.
What is California’s statewide sales tax rate in 2026?
The statewide base rate is 7.25 percent. Most cities and counties add district taxes on top of that base rate, so the total rate a business must collect depends on the customer’s delivery address.
Does drop shipping create nexus in California?
It can. Using a drop shipper, third-party warehouse, or fulfillment center located in California is generally treated as a physical presence, which can create nexus even if the retailer never sets foot in the state.
Do I need a physical location in California to owe sales tax?
No. A business that meets the $500,000 economic nexus threshold must register with the CDTFA and collect California use tax even without any employees, offices, or inventory in the state.
The Bottom Line
California, like many states, uses the concept of nexus to determine whether an out-of-state retailer must register with the CDTFA and collect sales tax from its customers. Today, that connection can be established either through “sufficient presence,” ranging from a brief appearance at a trade show to a permanent warehouse, or purely through economic activity once sales into the state cross $500,000.
The definition of “engaging in business” in California also incorporates the standard set by the commerce clause of the U.S. Constitution, which gives the federal government the right to “regulate commerce with foreign nations, and among the several states, and with the Indian tribes.” (Article 1)
If your business’s primary operations are outside California but you meet the requirements for nexus, you must register with the CDTFA and collect sales tax from your California customers. You must also stay current on all changes to the state, county, city, and district tax rates that apply to your sales.
Facing a California Sales Tax Audit?
CDTFA audits can result in significant assessments – especially if records are incomplete. The direction of the audit is largely set by how you respond to the initial document request. If you’re at any stage of a sales tax audit, a brief review can clarify what you’re facing.
Discuss My Sales Tax Audit → Or call: (619) 378-3138
