Part 1: Formation and Business Operations
A: Choosing Your Entity and Jurisdiction
LLC, S-corp, or C-corp — what actually changes based on your state, your tax posture, and whether you'll ever want partners or a bank behind you.
Why entity choice matters more than it seems
Most owners pick an entity once, early, and never revisit it — often based on whatever a friend's accountant recommended or whatever the online formation service defaulted to. That's a mistake. Your entity choice determines how you're taxed, how exposed your personal assets are, how easy it is to bring on a partner or sell the business later, and how much paperwork you're on the hook for every year.
The good news: for most small and medium-sized businesses, the decision comes down to a short list of real options, each with clear tradeoffs.
LLC vs. S-corp vs. C-corp
A Limited Liability Company (LLC) is the default starting point for most owner-operated businesses. It shields your personal assets from business debts and lawsuits, and by default it's taxed as a pass-through — profits flow to your personal return, and the business itself pays no separate federal income tax.
Electing S-corp tax treatment (which can apply to either an LLC or a corporation) becomes attractive once the business is consistently profitable, typically once net income clears roughly $60,000–$80,000 a year. An S-corp lets you split income between a reasonable salary (subject to payroll tax) and distributions (not subject to payroll tax), which can meaningfully reduce your self-employment tax bill. The tradeoff is more payroll administration and stricter compliance requirements.
A C-corp makes sense in a narrower set of cases: if you plan to raise outside investment from institutional investors, offer employee stock options at scale, or eventually go public. Absent one of those goals, most SMB owners should avoid C-corp status — it introduces double taxation (the corporation pays tax on profits, then shareholders pay tax again on dividends) with none of the offsetting benefits.
Where to form your business
Startups chasing venture capital often form in Delaware regardless of where they operate, because that's what investors expect. For a business that isn't raising institutional capital, that logic mostly disappears. In almost all cases, you should form your entity in the state where you actually do business.
Forming out-of-state (a common pitch from formation services) usually just adds cost: you'll still need to register as a "foreign entity" in your home state, pay fees in both states, and maintain a registered agent in a state you have no other connection to — with no offsetting legal benefit for a business that isn't raising VC money.
What changes if you bring on a partner or investor later
An LLC can accommodate multiple owners (called "members") from the start, and its operating agreement can be customized to allocate profits, losses, and control however the owners agree — more flexibly than corporate stock. If you ever take on a silent investor, a family member's capital, or a bank loan requiring a personal guarantee from multiple owners, the LLC structure typically adapts more easily than converting a sole-proprietorship or single-member entity after the fact.
B: Ownership Basics — What Owners Get Wrong Early
The ownership and buy-in mistakes that are cheap to fix in year one and expensive to unwind once the business has real value.
Verbal agreements don't survive success
The single most common ownership problem in small businesses isn't a bad deal — it's no deal at all. Two people start a business, agree informally on a 50/50 split or a rough sense of "who owns what," and never write it down. This works fine until the business is worth something, at which point everyone's memory of the original agreement conveniently favors themselves.
Every co-owned business needs a written ownership agreement from day one, even if the business is small and the owners are close friends or family. The agreement should state, unambiguously, who owns what percentage, what each owner contributed (cash, equipment, sweat equity, existing customer relationships), and how additional contributions will be valued going forward.
Sweat equity and unequal contributions
It's common for one owner to put in cash and another to put in time, or for ownership percentages to shift as one partner takes on more operational responsibility. These arrangements are legitimate, but they need to be documented with real numbers, not vague intentions — otherwise you're setting up a dispute for the day the business either struggles or succeeds beyond what anyone expected.
Assign a dollar value to sweat equity contributions, even if imperfect, rather than leaving it as an undefined "fair share"
Document any vesting schedule if ownership is earned over time rather than granted up front
Revisit and formally amend ownership percentages whenever a material change occurs — don't let the written agreement drift out of sync with reality
The minority owner problem
If you bring on a minority partner — someone who owns less than 50% — think through what rights they have beyond a share of the profits. Do they have a vote on major decisions? Can they block a sale of the business? Can they be removed, and under what circumstances? Silence on these questions doesn't protect the majority owner — it just means the answers get decided by state default law or a judge if a dispute ever arises, and default law is often more protective of minority owners than founders expect.
Getting a 409A or formal valuation isn't just for startups
SMB owners sometimes assume formal valuations are only relevant to VC-backed companies. In practice, any time you're issuing ownership to a new partner, buying out a departing one, or transferring interest to a family member, an informal handshake number invites disputes — and, in the case of gifts or transfers to family, can create unexpected tax exposure. A periodic, professionally-supported valuation, even a light one, is cheap insurance against all three problems.
C: Partnership Agreements and Buy-Sell Provisions
What happens when a co-owner wants out, gets divorced, dies, or stops pulling their weight — and why you need this in writing before you need it.
The four events that end partnerships
There's a shorthand for this in the legal world: death, disability, divorce, and disagreement. Any one of these can put a co-owner's stake in play, and if you haven't addressed it in advance, you're negotiating the terms under the worst possible conditions — grief, conflict, or a court order.
Death — without a plan, a partner's stake passes to their estate, potentially putting you in business with an uninvolved heir
Disability — most agreements are silent on whether a disabled partner still receives a full profit share indefinitely
Divorce — in many states, a spouse can have a marital property claim to a business interest acquired during the marriage
Disagreement — the most common trigger, and the one most likely to freeze decision-making without a resolution mechanism
What a buy-sell agreement actually does
A buy-sell agreement is a contract among owners (or between owners and the business) that answers one question in advance: if an owner leaves, what happens to their stake? Done well, it covers the triggering events that activate the agreement, the valuation method for pricing the departing owner's stake, the funding mechanism for actually paying for the buyout, and a right of first refusal that prevents an owner from selling to an outside third party without first offering the stake to existing owners.
The valuation problem
The single most common mistake is leaving valuation vague — "fair market value as determined by the parties" sounds reasonable until the parties can't agree, and now you're each paying for a competing business appraisal in the middle of a dispute. A better approach fixes the method up front: a formula tied to revenue or EBITDA, a fixed price revisited annually, or a pre-agreed appraiser. None of these is inherently right — the point is picking one while everyone's still getting along.
Funding the buyout
Even a fair price is meaningless if the business can't pay it. For a death trigger, this is usually solved with a life insurance policy on each owner, sized to cover their ownership stake, with the business or the other owners as beneficiary. For a voluntary exit or disagreement, funding is more often structured as a promissory note — a down payment plus payments over several years, so the buyout doesn't drain the business's working capital in one shot.
A note on informal partnerships
If you and your co-owner never formalized a partnership agreement, you may still have one — many states treat a business run by two or more people sharing profits as a general partnership by default, with each partner personally liable for the business's debts. If that describes your business, formalizing your structure and your buy-sell terms isn't optional paperwork. It's closing an open liability.
