Most founders we meet made their entity decision in an afternoon on a formation website. The tax consequences of that afternoon follow them for years: into the first fundraising round, into the first state audit letter, and finally into the exit, where the bill for an early shortcut can run into seven figures.
The United States has spent roughly 250 years engineering answers to three old business problems: trust (the corporate form), risk (limited liability), and incentive (equity compensation and the "check-the-box" tax election). The system is unusually flexible. It is also unusually unforgiving of decisions made out of order.
This article follows the three acts in the order a company actually lives them. The short version: your legal form and your tax character are separate choices; your footprint is your tax trail; and a great exit starts on the day of formation.
Act I. Enter: legal form and tax character are two separate decisions
Two different authorities govern a U.S. company, and founders routinely confuse them.
The state decides what the company looks like: a Partnership, a Corporation, or a Limited Liability Company (LLC). That is the shell. It determines liability protection, governance, and what you file with the Secretary of State.
The IRS decides what the company counts as for federal income tax: a Disregarded Entity, a Partnership, an S Corporation, or a C Corporation. That is the core. It determines who pays tax on the profit, at what rate, and on which form.
The two are not locked together. An LLC can be taxed under any of the four classifications. Since the 1997 "check-the-box" regulations (Treas. Reg. §301.7701-3), an eligible entity chooses its tax core by filing Form 8832, or Form 2553 for S status. Very few countries separate these layers. In our experience, this separation is where most of the entry-stage planning value sits, and where most of the entry-stage mistakes are made.
A decision frame we use
The table is deliberately simplified. Every real case turns on ownership, funding plans, and the founders' own tax residency.
| Situation | Usual starting point | Why |
|---|---|---|
| U.S. tax resident, small scale, no large exit planned | LLC taxed as pass-through | One layer of tax; early losses flow to the owner's return |
| Foreign individual or company entering the U.S. market | LLC or corporation taxed as a C corporation | Keeps the foreign owner out of U.S. personal filing; cleaner treaty and withholding treatment |
| VC-backed, high-growth, large exit expected | Delaware C corporation | What investors expect; standard stock instruments; QSBS eligibility |
| Professional practice (law, accounting, consulting) | LLP or PLLC | Licensing rules usually require it; note these businesses are excluded from QSBS |
The one number to know on day one
Section 1202, Qualified Small Business Stock (QSBS). For qualifying C-corporation stock acquired after July 4, 2025, up to $15 million of capital gain per issuer (or ten times basis, if greater) can be excluded from federal tax. The benefit exists only if the company was a C corporation when the stock was issued and was under the gross-asset ceiling at that moment. A founder who starts as an LLC and converts later restarts the clock and may forfeit eligibility for the earliest, cheapest shares entirely.
That is why we say exit planning begins at formation. The QSBS decision is not made when a buyer appears. It was made, or missed, years earlier.
Entry-stage mistakes we see repeatedly
- Choosing the legal form because it was cheap to file, and inheriting the tax classification by default.
- A foreign owner electing pass-through treatment, then discovering they must file a U.S. personal return (Form 1040-NR) every year and expose themselves to U.S. estate tax.
- Issuing founder shares before the C-corporation election takes effect, which can break the QSBS holding period.
- Forgetting that an S corporation cannot have non-resident alien shareholders or corporate shareholders. This surfaces the moment a parent company in China wants to invest.
Act II. Expand: where your business goes, tax follows
Nexus is the legal term for a taxable connection to a state. Until 2018 it required physical presence: an office, employees, inventory, property. In South Dakota v. Wayfair, Inc. (2018) the U.S. Supreme Court held that economic nexus, a threshold of sales into the state, is enough on its own. You can owe tax in a state you have never visited.
Two separate tax systems are involved. They are judged independently, and confusing them is the single most common expansion error we correct.
Sales tax is money you collect from customers on the state's behalf. Economic-nexus thresholds typically run from $100,000 to $500,000 of in-state sales; some states also count transaction volume. It applies mainly to tangible goods, and increasingly to software and digital products.
Income (or franchise) tax is money taken from your own profit. Most states apply a "factor presence" test on sales, property, or payroll. It applies to every business type, including pure services.
California, worked through
- Sales tax economic nexus: $500,000 of tangible personal property sold into California in the current or prior calendar year.
- Income tax "doing business" test, 2025 amounts (adjusted annually by the Franchise Tax Board): sales of $757,070, property of $75,707, or payroll of $75,707, or any one of these exceeding 25% of your total.
Two companies:
- A consulting firm with $800,000 of California revenue sells nothing tangible. No California sales tax. But it clears the $757,070 income-tax threshold, so it files a California return and pays franchise tax.
- An e-commerce seller ships $600,000 of goods into California. It clears the $500,000 sales-tax threshold and must register and collect. If California is only 10% of its total sales and the dollar figure stays under $757,070, it may not yet owe California income tax.
Same state, opposite answers. And a company operating at a loss still owes California's $800 minimum franchise tax once it is "doing business" there.
Four expansion myths
- "No office, no tax." Economic nexus ended that in 2018.
- "Sales tax and income tax are the same thing." Different thresholds, different bases, different forms.
- "We lost money, so we owe nothing." Minimum taxes and filing duties apply regardless of profit.
- "Amazon collects the sales tax, so we're done." Marketplace facilitator laws cover the marketplace's sales, not your direct channel, and say nothing about income tax.
Your footprint is your tax trail. Every warehouse, remote employee, and threshold crossed is a potential filing obligation.
What we ask growing clients to do
- Track sales by state monthly. Thresholds are tested on rolling or calendar-year windows, and by the time an annual report shows the problem, the penalty period has already started.
- Map where remote employees and contractors sit. Payroll creates nexus in most states.
- Register before crossing a threshold when you can see it coming. Voluntary registration is cheaper than a back-assessment.
- Revisit the map every time you add a fulfillment center or a marketplace channel.
Act III. Exit: QSBS, the founder's most valuable tax tool
Section 1202 lets an individual exclude capital gain on the sale of qualifying C-corporation stock. The One Big Beautiful Bill Act, signed July 4, 2025, expanded the provision substantially for stock acquired after that date:
| Item | Stock acquired on or before July 4, 2025 | Stock acquired after July 4, 2025 |
|---|---|---|
| Per-issuer exclusion cap | $10 million (or 10× basis) | $15 million (or 10× basis), inflation-indexed |
| Corporate gross-asset ceiling at issuance | $50 million | $75 million, inflation-indexed |
| Holding period for exclusion | 5 years for 100% | 3 years: 50% · 4 years: 75% · 5 years: 100% |
Four conditions and one trap
- Right status. C-corporation stock, acquired at original issuance, held by a non-corporate taxpayer.
- Held long enough. The tiers above. Under the old rule, selling at four years and eleven months meant zero exclusion. Under the new rule it means 75%.
- Real operating business. At least 80% of assets in an active qualified trade. Software, e-commerce, manufacturing, and biotech generally qualify. Professional services, finance, real estate, hospitality, farming, and mining do not.
- Small enough at issuance. Aggregate gross assets at or below the ceiling immediately after the stock is issued.
- The state trap. The federal exclusion does not bind the states. California does not recognize QSBS. A California-resident founder still pays state tax, at rates up to 13.3%, on the full gain. Pennsylvania, Alabama, and Mississippi also decline to conform. Planning around this, for example with a properly structured non-grantor trust in a state without income tax, has to be in place long before a sale is negotiated.
An illustration
A founder receives shares at formation in 2026 with a basis of $10,000. The company sells in 2030, four years later, and the founder's gain is $12 million.
Federal: 75% of the gain, $9 million, is excluded under the tiered rule. The remaining $3 million is taxed at the §1202 rate of 28%, plus the 3.8% net investment income tax where applicable.
California, if the founder is a resident: the full $12 million is subject to state tax. On a gain of this size the state liability alone can exceed $1.5 million. That is why the residency and trust conversation belongs in year one, not the quarter before closing.
Had the founder held one more year, the federal exclusion would have been 100%. We have seen closing dates negotiated over exactly this point, and it is a negotiation worth having.
The trilogy in three lines
Enter: legal form and tax character are separate choices. Make both on purpose. Expand: your footprint is your tax trail. Track it by state, every month. Exit: a great exit starts with a smart beginning. QSBS eligibility is fixed at formation.
Tax planning is not a setup task. It is a sequence, and each act depends on the one before it.
Questions we hear most
I'm a foreign investor. Can I hold QSBS through my company back home? No. The exclusion is for non-corporate taxpayers: individuals, trusts, and pass-throughs owned by individuals. A foreign parent corporation holding the shares does not qualify.
We started as an LLC two years ago. Is QSBS gone for good? Not necessarily, but the clock starts at conversion, not at formation. Shares deemed issued when you become a C corporation begin a new holding period, and the gross-asset test is applied at that moment. Gain built up before conversion is generally not eligible.
We only sell through Amazon. Do we really have nexus anywhere? Amazon's marketplace facilitator status covers sales-tax collection on marketplace orders. The inventory Amazon holds for you in its fulfillment centers is still your property in that state, and it can create both sales-tax and income-tax nexus.
If we register for sales tax in a state, does that mean we owe income tax there too? Not automatically. The tests are independent. But states cross-check sales-tax registrants against income-tax filers, so registering for one invites questions about the other.
When should we first talk to a CPA about exit structure? Before the first share is issued. Most QSBS failures we see are not tax-law failures. They are formation-timing failures, and one meeting would have prevented them.
Sources
- IRS, About Form 8832, Entity Classification Election
- 26 U.S.C. §1202, as amended by Pub. L. 119-21 (One Big Beautiful Bill Act, July 4, 2025)
- California Franchise Tax Board, Doing business in California, 2025 threshold amounts
- California Department of Tax and Fee Administration, Use tax collection requirements based on sales into California due to the Wayfair decision
- South Dakota v. Wayfair, Inc., 585 U.S. 162 (2018)
This article is general information, not tax advice. Cross-border and multi-state facts change outcomes; consult a CPA on your specific situation before acting.
