If you operate an online business and store products in California Amazon FBA warehouses, you are subject to a unique and often misunderstood set of California tax obligations. Many sellers are surprised to learn that simply storing inventory in California can trigger multiple taxes even if the business is based in another state or another country.
This guide explains all major tax liabilities for online businesses selling into California, including:
- Sales tax obligations
- Franchise tax requirements
- Income tax exposure
- Nexus rules for Amazon FBA sellers
- Differences between marketplace and direct sales
- Obligations for U.S. and foreign-owned businesses
If you sell products online and use fulfillment centers in California, this article will help you understand exactly what taxes apply and how to stay compliant.
Nexus Triggers: When Does Your Business Have California Tax Nexus?
In California, tax liability begins when your business is considered to be “doing business” in the state. This status is created through nexus, which means a sufficient connection between your business and California.
For online businesses and Amazon FBA sellers, the most common nexus triggers are:
Physical Presence Nexus (Inventory in California)
Storing inventory in California is one of the strongest nexus triggers.
If Amazon places your products in any California fulfillment center, your business is considered to have a physical presence in the state — even if:
- You never travel to California
- You have no employees there
- You have no office or address there
- You did not choose to store inventory there
Once inventory is stored in California:
- Your business is legally “doing business” in California
- Franchise tax obligations begin
- Income tax apportionment begins
- Sales tax obligations may apply
This applies to:
- Amazon FBA sellers
- Third-party logistics (3PL) warehouses
- Drop-shipping arrangements where inventory is in CA
Economic Nexus (Sales Threshold)
Even without physical presence, California imposes tax obligations once your sales volume into California exceeds a threshold.
For sales tax purposes:
- If you exceed $500,000 in annual California sales, you must register and collect California sales tax
For income and franchise tax purposes:
- If your California sales exceed a much higher annual threshold (adjusted yearly for inflation), California may assert income tax nexus
However, physical presence overrides thresholds.
If you store inventory in California, you have nexus immediately regardless of sales volume.
California Sales Tax for Online Businesses
Sales tax is usually the first tax obligation online sellers encounter.
If your business has nexus in California, you are required to:
- Register with the California Department of Tax and Fee Administration (CDTFA)
- Obtain a California seller’s permit
- Collect California sales tax on taxable sales shipped to California
- File sales tax returns and remit collected tax
Marketplace Facilitator Rule (Amazon FBA)
California has a marketplace facilitator law that shifts sales tax collection responsibility to platforms like Amazon.
If you sell through:
- Amazon
- Walmart Marketplace
- Etsy
- eBay
Then:
- The marketplace collects California sales tax from the customer
- The marketplace remits the tax to California on your behalf
For Amazon FBA sellers, this means:
- You do not charge sales tax yourself on Amazon orders
- Amazon handles collection and remittance
However:
- This only applies to marketplace sales
- It does not remove your nexus
- It does not eliminate franchise or income tax obligations
Direct Sales (Shopify, Website, Invoices)
If you sell through:
- Shopify
- WooCommerce
- Your own website
- Invoicing or manual sales
And you have California nexus:
- You must collect California sales tax yourself
- You must remit it to CDTFA
- You must file periodic sales tax returns
Marketplace protection does not apply to direct sales.
California Franchise Tax: The $800 Minimum Annual Tax
One of the most important and misunderstood California taxes is the franchise tax.
If your business is “doing business” in California, most entities must pay:
$800 per year minimum franchise tax
This applies even if:
- You have no profit
- You have a loss
- You made very few sales
- You only stored inventory briefly
Entities Subject to Franchise Tax
The $800 minimum applies to:
- LLCs
- C-corporations
- S-corporations
- Limited partnerships
- LLPs
- Foreign entities registered in California
It applies to both:
- U.S.-based companies
- Foreign (non-U.S.) companies
The only major exemptions:
- Sole proprietors
- General partnerships (without entity registration)
When the $800 Is Due
Once nexus begins:
- You must register as a foreign entity in California
- You owe $800 per year for each year you are doing business
- The tax continues until you formally withdraw from California
Many Amazon sellers first discover this obligation when they receive back tax bills from California for multiple prior years.
California Income Tax on Online Businesses
Beyond the franchise tax, California also imposes income tax on profits attributable to California.
This applies to:
- U.S. companies
- Foreign companies
- Pass-through entities
- Corporations
How Income Is Taxed
California does not usually tax your entire profit.
Instead, it taxes the portion of your income apportioned to California.
For most online sellers:
- Apportionment is based primarily on sales shipped to California customers
Example:
- Total U.S. sales: $2,000,000
- California sales: $500,000 (25%)
- Total net profit: $400,000
California taxable income:
- 25% × $400,000 = $100,000
Corporate Income Tax Rates
| Entity Type | California Tax |
| C-Corporation | 8.84% of CA-apportioned profit |
| S-Corporation | 1.5% of CA-apportioned profit |
| LLC (pass-through) | Taxed at owner level |
| Foreign corporation | 8.84% on CA-apportioned income |
The $800 franchise tax is a minimum if income tax exceeds $800, you pay the higher amount.
LLC Fee (Additional Trap for High-Revenue Sellers)
LLCs may also owe an additional LLC fee based on gross California revenue, not profit.
This applies if CA gross receipts exceed:
- $250,000
- $500,000
- $1,000,000
- $5,000,000
The fee ranges from:
- $900 up to $11,790
This is owed in addition to the $800 minimum tax.
Foreign Companies Selling Through California FBA
Foreign ownership does not protect against California tax.
If a:
- UK company
- Israeli company
- EU company
- Offshore company
Stores inventory in California or sells to California customers:
- Nexus is created
- Franchise tax applies
- Income tax applies
- Sales tax rules apply
Tax treaties generally do not protect against state taxes.
California can tax:
- Foreign corporations
- Foreign LLCs
- Foreign partnerships
- Foreign individuals
Once inventory is in California, state tax jurisdiction attaches.
Marketplace vs Direct Sales: Tax Differences
| Area | Amazon Marketplace | Direct Website Sales |
| Sales tax collection | Amazon collects & remits | You must collect & remit |
| Nexus created | Yes | Yes |
| Franchise tax | Yes | Yes |
| Income tax | Yes | Yes |
| Reporting burden | Lower | Higher |
Amazon helps with sales tax only all other taxes remain your responsibility.
Compliance Tips for Online Businesses
To avoid penalties, audits, and back taxes:
1. Monitor Where Your Inventory Is Stored
- Track Amazon inventory by state
- Know when California storage begins
- Identify the first year of nexus
2. Register Properly
- Register as a foreign entity in California (if applicable)
- Obtain a seller’s permit if needed
- File the correct entity returns annually
3. File Returns Even If Tax Is Zero
- File franchise tax returns
- File income tax returns
- File sales tax returns (if registered)
Non-filing often triggers audits and estimated assessments.
4. Use Professional Support
Multi-state taxation for FBA sellers is complex.
Professional planning can:
- Reduce apportionment exposure
- Avoid unnecessary registrations
- Structure entities efficiently
- Manage voluntary disclosures if needed
Final Takeaway
If your business stores products in California Amazon FBA warehouses and sells to California customers, you likely face three separate tax systems:
- Sales tax (handled by Amazon for marketplace sales)
- Franchise tax $800 per year minimum
- Income tax on California-apportioned profits
These rules apply to:
- LLCs
- Corporations
- Pass-through entities
- U.S. companies
- Foreign companies
Inventory in California is one of the strongest nexus triggers in the United States.
Ignoring it can result in:
- Back franchise taxes
- Back income taxes
- Penalties and interest
- Forced registrations and audits
Understanding these rules early allows online sellers to remain compliant, plan intelligently, and continue selling into one of the largest consumer markets in the world with confidence.
