One of the very first decisions you make as a business owner, often before you have earned a dollar, is what structure to operate under. It feels like a box-checking chore. It isn’t. The structure you pick decides how your profit is taxed, how much self-employment tax you hand over, and how freely you can split income with a partner. Here is how the main choices compare, and how to pick one.
1. First, the menu
You have five options worth knowing: the sole proprietorship, the general partnership, the limited liability company (LLC), the S corporation, and the C corporation.
The first two you get for free, whether you want them or not. One person selling something is automatically a sole proprietor. Two or more people doing it together, with nothing on paper, are automatically a general partnership. The LLC is a formal entity you register with your state.
Here is the part that confuses almost everyone: an S corporation isn’t really a separate kind of company – it’s a tax election. An LLC or a corporation files a form with the IRS asking to be taxed under the S-corp rules. So most small business owners are really choosing an LLC first, then choosing how it gets taxed.
2. Going it alone
Starting solo? Your default is the sole proprietorship. No filing, no separate return. Your profit lands on Schedule C of your personal Form 1040. Beautifully simple.
The simplicity comes with two strings attached. First, every dollar of net profit gets hit with self-employment tax, 15.3% (12.4% for Social Security on income up to $184,500 in 2026, plus 2.9% for Medicare), and that is before regular income tax. Second, there is no wall between you and the business. If it gets sued, your house and savings are within reach.
A single-member LLC fixes the second problem without touching the first. The IRS treats a one-owner LLC as a “disregarded entity”: for tax purposes it simply ignores it, and you file the same Schedule C as before. You get the legal wall; your tax bill doesn’t budge. For most solo owners, that makes the LLC cheap insurance and the sensible place to start.
3. Teaming up with a partner or two
The minute you go into business with one or two other people and don’t form anything, the law has chosen for you: you’re a general partnership. That’s a risky default, because each partner is personally on the hook for the whole business, including a debt a partner runs up without asking you.
The cleaner move is a multi-member LLC. By default the IRS taxes it as a partnership: the business files an information return (Form 1065) and hands each owner a Schedule K-1 showing their share of the profit, which each person reports on their own return. The business itself pays no income tax. Everything flows through to the owners, and, just like a sole proprietor, an active partner generally pays self-employment tax on their share.
Partnership taxation has one feature a solo owner never gets: flexibility. You don’t have to split profit and loss strictly by ownership percentage. Say one partner puts in the startup cash and the other does the daily work – you can steer more of the early losses to the funder and more of the profit to the one running the shop. The rules call these “special allocations,” and they must reflect real economics, not just tax wishes. Whatever you agree to, put it in a written operating agreement: who owns what, who does what, and what happens the day someone wants out.
4. The S-corp election: a tax move, not a new company
Once a business, solo or partnered, is reliably profitable, the S-corp election is worth a serious look. The appeal is specific: in an S corp, an owner who works in the business takes a “reasonable salary” as a W-2 employee, and the leftover profit comes out as a distribution that escapes the 15.3% self-employment tax. On a healthy profit, that adds up.
It isn’t free money. You have to run real payroll, file a separate return (Form 1120-S), and pay yourself a salary that is genuinely reasonable for the work; the IRS watches that number closely. As a rough gauge, the election starts paying off once profit runs comfortably past a reasonable salary, often by $40,000 or more. One catch for partners: an S corp must split profit strictly by ownership percentage, so a partnership’s special-allocation flexibility disappears.
5. The C corporation and how to choose
The C corporation is the only structure here that pays its own income tax, a flat 21%, and then taxes its owners again on any dividends they take. That “double taxation” is why most small, owner-run businesses pass on it. Where it shines is raising money: venture capital investors almost always expect a C corporation, and the structure can also let founders exclude a large share, sometimes all, of their gain when they sell stock held for several years.
So how do you choose? If you’re solo and keeping life simple, a single-member LLC taxed as a sole proprietor is the natural home – add the S-corp election later, once profit justifies it. Partnering up? A multi-member LLC taxed as a partnership gives you the legal wall plus the freedom to split income fairly. And if you plan to raise serious outside capital, look hard at the C corporation. The reassuring part: none of these doors lock behind you – the right answer for year one often isn’t the right answer for year five.
A final word
The cost of getting this decision wrong compounds quietly: overpaid self-employment tax, a missed election, a profit split that doesn’t hold up under a closer look. The right structure depends on details a general guide can’t see: your state’s rules, your income, your partners, and where you want the business to be in five years. That’s the kind of question worth a real conversation. If you’d like a tailored review of which structure fits your business, or a broader look at your tax strategy, reach out anytime HERE. Let’s put the most money where it belongs: back in your business, so that you can focus on what you do best to take your business to the next level.
Shang (Shawn) Zhou, CPA