Form your LLC where you operate — not Delaware. Here's when you must register as a foreign LLC in a second state, what creates nexus, and which state actually taxes the income.
Where should your LLC live when your business touches more than one state? The short answer: form the LLC in the state where you actually operate, and register as a "foreign LLC" in any other state where you have real presence — employees, an office, property, or in some cases enough sales. Income tax follows where the work happens and where the customers are, not where the LLC's paperwork was filed. Forming in a "business-friendly" state doesn't move your tax bill; it usually just doubles your fees.
This post untangles the three separate questions people mash together — where to form, where to register, and where to pay tax — and busts the Delaware/Wyoming myth along the way. If you're still choosing an entity type at all, start with our pillar guide to LLC vs S Corp vs C Corp in 2026.
Delaware and Wyoming are marketed hard: privacy, no state income tax, famous courts. For a venture-backed startup planning a priced round, Delaware makes sense. For a small operating business — an agency in Ohio, a contractor in Georgia, a therapist in Colorado — it's usually a trap, because:
Rule of thumb: an operating business forms where its owner-operators are. And if a foreign (non-US) owner is involved, the analysis changes entirely — see our post on foreign-owned single-member LLCs and Form 5472 before copying any US founder's playbook.
For a default-taxed LLC, the entity is a pass-through — profits land on the owners' personal returns, as covered in our single-member LLC tax guide. Which state taxes that profit turns on two things:
Notice that "state of formation" appears nowhere on that list. A California resident running a Nevada-formed LLC from a Sacramento home office owes California tax on the profit — plus California's annual franchise tax once the LLC registers there, which it must.
"Nexus" is the connection that gives a state the right to tax you or require registration. Two flavors matter:
The traditional trigger, and still the clearest: an office, a warehouse, inventory, equipment, real estate, or people — employees or regular contractors working in the state. One remote employee in a new state is the most common way a small business acquires a second-state footprint without noticing: it can create registration duties, payroll tax accounts, and income tax apportionment all at once. Before extending a remote offer, price in the compliance: a registered agent, a foreign registration, an annual report, and a payroll setup in the new state, every year that person stays.
Since the Wayfair decision, states can also assert nexus from sales volume alone — most states use a $100,000 sales threshold for sales tax purposes, and many have dropped the old 200-transaction test. Economic nexus is primarily a sales tax concept, and it's a big enough topic that we cover it separately in our guide to sales tax nexus for online sellers. Some states extend economic-presence ideas to income tax too, so high sales into one state deserve a look even with no physical presence.
Registering in a second state ("foreign qualification") is required when you're doing business there under that state's law. Definitions vary, but you almost always need to register when you have, in that state:
What generally does not require registration: selling remotely into a state, having customers there, or shipping products there from elsewhere (sales tax may still apply — different question). Skipping a required registration can mean penalties, back fees, and in many states losing the right to enforce contracts in that state's courts until you register. Each registration also brings annual reports and fees, and states keep adding disclosure regimes on top — New York's is a good example; see our post on the New York LLC Transparency Act effective January 1, 2026.
Once two states can tax the business's income, you don't pay tax twice on the same dollar — you apportion. Each state taxes a slice of the profit based on a formula, most commonly driven by where your sales go, sometimes weighted with payroll and property. Conceptually: if a quarter of your revenue is attributable to State B under its formula, State B taxes roughly that quarter, and your home state gives you a credit or excludes that slice. The formulas differ state to state and the details get technical fast, but the principle is simple — the profit gets divided, not duplicated. The real-world cost of multi-state life is usually the compliance: more returns, more fees, more deadlines.
Form where you operate. Register where you have people, places, or property. Pay tax where the work and sales happen. The formation state is the least important of the three.
For a small operating business, multi-state strategy is mostly defense: form at home, add foreign registrations only where real presence demands it, watch the nexus triggers (especially remote hires), and let apportionment — not wishful formation choices — determine where the income is taxed. The Delaware LLC that saves taxes for someone else will just cost you a second set of annual fees.
Taxagon's CPAs and EAs handle formations, foreign registrations, and multi-state filing decisions through our business formation service — if you'd rather not navigate it alone, reach out.
This article is general information, not tax advice for your specific situation. Tax law changes; figures are for the years stated.
Talk it through with a licensed US tax professional — we'll tell you honestly whether it applies to your situation.
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