If your company is incorporated in Delaware, Texas, Wyoming, or anywhere else and you have customers, employees, property, or revenue connected to California, you may already owe taxes to the state. Whether you realize it or not. California has one of the broadest definitions of “doing business” of any state in the country. It uses two separate legal standards: one from the Secretary of State for registration, and a much lower bar from the Franchise Tax Board for taxation. Many out-of-state businesses trip the tax threshold without ever setting foot in the state. The consequences are not theoretical. The minimum obligation is $800 per year in franchise tax, due even if your business earns zero profit in California. For LLCs with significant California revenue, the total climbs to $12,590 or more annually. And if you fail to register or file? The state can suspend your entity’s right to conduct business, enforce contracts, or defend itself in California courts. This guide walks through every compliance obligation an out-of-state entity faces in California, what triggers it, what it costs, and what you need to file, backed entirely by official California government sources.

What “Doing Business” Actually Means in California

California uses two different legal definitions to determine whether your business is operating in the state. Understanding the distinction matters, because you can owe California taxes without ever being required to register with the Secretary of State, and vice versa.

The Tax Definition (Franchise Tax Board)

The California Franchise Tax Board defines “doing business” under Revenue and Taxation Code Section 23101(a) as “actively engaging in any transaction for the purpose of financial or pecuniary gain or profit.” That language is intentionally broad. Beyond that general definition, R&TC Section 23101(b) establishes specific quantitative thresholds, often called the “factor presence” test. Your business is automatically considered to be doing business in California if any one of the following is met: your California sales exceed the lesser of approximately $757,070 or 25% of your total sales; your real and tangible property in California exceeds the lesser of approximately $75,707 or 25% of your total property; the compensation you pay to California employees exceeds the lesser of approximately $75,707 or 25% of your total compensation. (Source: FTB, ftb.ca.gov; 2025 thresholds adjusted annually per R&TC Section 23101(b).) These are bright-line thresholds. Meet any single one, and you have a California filing obligation. But even if you fall below all three, the FTB can still determine you are “doing business” under the broader general definition in Section 23101(a). This was reinforced by the California Office of Tax Appeals in the October 2025 decision Matter of the Appeal of Diet Standards LLC (OTA Case No. 230613542). Diet Standards, a Delaware LLC based in Florida, stored inventory in California fulfillment centers. Even though its numbers were below thresholds, the OTA ruled it was “doing business” and owed the $800 annual LLC tax plus penalties. The takeaway: the factor-presence thresholds are not a safe harbor.

The Registration Definition (Secretary of State)

The Secretary of State uses a different standard: “transacting intrastate business” under CA Corporations Code Sections 17708.03 (LLCs) and 2105 (corporations). This is a higher bar than the FTB definition. Some businesses owe California franchise tax without needing to register, while others need to do both.

Common Scenarios That Trigger California Obligations

• Remote employees in California. Even one remote employee triggers the FTB “doing business” definition. (Source: FTB, “Help with Doing Business in California,” ftb.ca.gov.)
• E-commerce sellers using FBA. Inventory in California fulfillment centers creates presence. Confirmed by the Diet Standards ruling.
• SaaS and service businesses. Under R&TC Section 25136(b), service sales are sourced to where the customer receives the benefit.
• Interests in CA pass-through entities. General partners/members of a CA LLC or partnership are automatically doing business in California. (Source: FTB Publication 3556.)
• California real property. Valued at original cost. Exceeding the $75,707 threshold triggers nexus.

If any of these apply, accurate bookkeeping is critical for determining your filing obligations.

The $800 Minimum Franchise Tax

Every corporation or LLC doing business in California must pay $800 annually, regardless of income. LLCs pay via Form FTB 3522 (due April 15). Corporations pay via Form 100-ES. Failure to pay can result in entity suspension. (Source: FTB, “Corporations,” ftb.ca.gov; FTB Publication 3556.)

The California LLC Fee Schedule

LLCs with California income of $250,000+ owe an additional tiered fee on gross receipts: (Source: R&TC Section 17942; FTB Publication 3556.)

California LLC Fee Schedule (Based on Total California Income)

LLCs with California income of $250,000 or more must pay an additional tiered LLC fee based on gross receipts.

Total California Income	LLC Fee
$250,000 – $499,999	$900
$500,000 – $999,999	$2,500
$1,000,000 – $4,999,999	$6,000
$5,000,000+	$11,790

Note: This fee is in addition to the mandatory $800 annual California LLC franchise tax. A controller-level financial review catches revenue classification issues before they become compliance problems.

How to Register as a Foreign Entity

• Foreign LLCs: Form LLC-5 online via bizfileOnline ($70). Certificate of Good Standing required. Statement of Information (Form LLC-12, $20) due within 90 days, then biennially. (Source: CA Secretary of State.)
• Foreign Corporations: Form S&DC-S/N ($100). Annual Statement of Information (Form SI-200, $25). (Source: CA Secretary of State.)

Getting tax compliance set up correctly from the start prevents cascading penalties.

California Income Tax Apportionment

Most businesses use single-sales-factor apportionment: the percentage of total sales to California customers determines the percentage of income taxed by California. Services are sourced under market-based sourcing (R&TC Section 25136(b)). (Source: R&TC Sections 25128.7 and 25136.) A CFO-level analysis of your multi-state allocation can identify exposure and reduction opportunities.

Public Law 86-272 Protection

PL 86-272 protects businesses whose only CA activity is soliciting orders for tangible personal property. It does not protect service/digital businesses, does not shield against the $800 minimum tax, and the FTB interprets “solicitation” narrowly. (Source: FTB, ftb.ca.gov.)

Penalties for Non-Compliance

• Late payment: 5% of unpaid tax plus 0.5% monthly. Interest accrues continuously.
• Entity suspension: Suspended entities cannot conduct business, enforce contracts, or defend lawsuits in CA courts.

For e-commerce businesses, restaurants, construction firms, or professional service firms, the compliance risk is real.

Step-by-Step: What to Do

Step 1:

Determine your nexus against FTB thresholds.

Step 2:

Register if required. LLCs: Form LLC-5 ($70). Corps: Form S&DC-S/N ($100).

Step 3:

Pay the $800 minimum franchise tax by April 15.

Step 4:

Estimate and pay the LLC fee by June 15 if income exceeds $250,000.

Step 5:

File your CA tax return (Form 100, 100S, or 568).

Step 6:

Keep records clean. Professional bookkeeping that tracks multi-state data makes compliance manageable.

FAQ

1. What triggers the “doing business” definition?

Active transactions for profit in CA, or exceeding any factor-presence threshold: ~$757,070 sales, ~$75,707 property, ~$75,707 payroll (or 25% of totals). Adjusted annually.

2. Do remote employees trigger CA taxes?

Yes. Even one remote employee working from home in California triggers the FTB doing business definition.

3. What is the $800 franchise tax?

A flat annual charge on every entity incorporated, registered, or doing business in California. Due April 15. Applies regardless of profitability.

4. How much to register a foreign LLC?

$70 filing fee (Form LLC-5), plus $20 Statement of Information within 90 days, plus $800 annual franchise tax, plus tiered LLC fee if income exceeds $250,000.

5. Does PL 86-272 protect my business?

Only if your sole CA activity is soliciting orders for tangible goods. Does not protect services, digital products, or against the $800 minimum tax.

The Bottom Line

California compliance requirements for out-of-state businesses are aggressive by design. The bar for “doing business” is low, penalties are high, and the combination of franchise tax, LLC fees, apportionment, and registration demands accurate state-segmented financial records. Otterz combines AI-powered bookkeeping with expert tax compliance and CFO-level strategy for multi-state businesses. From e-commerce sellers to tech startups, we make California compliance manageable. Schedule a meeting with a CFO today and discover how Otterz can transform your financial operations with automation, accuracy, and predictive insights. Questions? Reach us via email at hello@otterz.co or call us at (857) 234 4000 we’d love to hear from you.