Most solo founders make their entity decision once, quickly, and never revisit it. They default to whatever a lawyer friend suggested, or whatever the first Google result said. That single decision — made in 20 minutes — can determine whether you pay $6,000 more in taxes every year or not. It deserves more than 20 minutes.
Why the entity choice matters
Your entity structure determines how the IRS taxes your business income, how much personal liability protection you have, and what administrative overhead you're taking on. For a solo founder generating real revenue, the difference between the wrong and right structure can exceed $9,000 per year in unnecessary taxes — money that compounds over time.
This is not legal or tax advice
This post explains the frameworks your CPA and attorney will use. Your specific situation may differ. Use this to have a smarter conversation with your advisors — not to replace them.
The four options at a glance
| Entity | Formation cost | Liability protection | Default tax treatment | Best for |
|---|---|---|---|---|
| Sole Proprietorship | $0 | None | Schedule C, 100% SE tax | Testing an idea, side projects, under $20k revenue |
| Single-Member LLC | $50–$500 | Yes | Disregarded entity (same as sole prop) | Anyone earning real revenue who wants protection |
| LLC + S-Corp Election | $50–$500 + ~$2k/yr admin | Yes | Salary + distributions — SE tax on salary only | Net profit consistently above $60–80k/year |
| C-Corp | $500–$2,000 | Yes | 21% flat rate + dividend tax | Raising VC, QSBS planning, foreign shareholders |
Sole proprietorship
A sole proprietorship is the default — if you're doing business and haven't filed anything, you're a sole proprietor. There's zero cost to set one up and no paperwork. But there's also zero liability protection: a judgment against your business is a judgment against you personally.
All profit flows to your personal Schedule C and is subject to self-employment tax (15.3% on the first $176,100 of net earnings in 2025, 2.9% above that). For a founder generating $100k in profit, that's ~$14,100 in SE tax alone — before income tax.
If you have a single client contract worth more than your personal net worth, you need liability protection. The moment you're generating meaningful revenue, a single-member LLC costs almost nothing to form and provides a real legal shield.
Single-member LLC
An LLC (Limited Liability Company) separates you from the business legally. A creditor can sue the LLC but — assuming you maintain proper separation (covered in Post 2) — cannot touch your personal savings, home, or car.
Tax treatment for a single-member LLC is identical to a sole proprietorship by default: it's a "disregarded entity" for IRS purposes. All income flows to your Schedule C. You can change this with an S-Corp election (see below), but the LLC itself doesn't change your tax picture without that step.
- File Articles of Organization with your state Secretary of State ($50–$500 depending on state)
- Get an EIN from the IRS (free, takes 5 minutes at IRS.gov)
- Open a dedicated business bank account (see Post 3)
- Keep a one-page Operating Agreement on file (even for single members)
LLC + S-Corp election
This is where the tax savings live for profitable solo founders. An S-Corp is not a separate entity type — it's a tax election you file on top of your LLC (using IRS Form 2553). The LLC structure remains; only the tax treatment changes.
The mechanism: instead of all profit flowing to Schedule C as self-employment income, you split it into two buckets. You pay yourself a reasonable W-2 salary (subject to payroll/SE taxes). Any remaining profit is distributed as a shareholder distribution — which is not subject to SE tax. That's where the savings come from.
At $100k net profit: a sole prop pays ~$14,100 in SE tax. An S-Corp founder paying themselves a $60k salary pays ~$9,180 in payroll tax — with the remaining $40k distributed free of SE tax. Gross savings of ~$4,920, minus $2,000–$4,000/year in payroll and CPA costs. Net benefit: $1,000–$3,000/year at $100k. That gap widens significantly as profit grows.
The S-Corp also unlocks the Accountable Plan (Post 6) — the ability to reimburse yourself tax-free for legitimate business expenses you paid personally, without creating taxable income.
C-Corp
C-Corps have a flat 21% federal tax rate. Profits distributed as dividends are taxed again on the shareholder's personal return — the classic "double taxation" problem. This makes C-Corps poor choices for founders who want to take money out of the business.
The C-Corp makes sense when: (1) you're raising institutional venture capital — most VCs won't invest in LLCs or S-Corps; (2) you want to take advantage of Qualified Small Business Stock (QSBS) exclusion under IRC §1202, which can exclude up to $10M in gains from tax at exit; (3) you have or expect foreign shareholders, who can't hold S-Corp shares.
If you form a qualifying C-Corp, hold shares for 5+ years, and sell, you can exclude up to $10M (or 10× your basis) in capital gains from federal tax under IRC §1202. For founders building toward an acquisition, this alone can justify the C-Corp structure and its added complexity.
The S-Corp profit threshold
The S-Corp election isn't free — you take on payroll administration, a higher CPA bill, and additional compliance requirements. The question is whether the tax savings exceed those costs.
Most tax professionals set the threshold at $60,000–$80,000 in annual net profit. Below that, the $2,000–$4,000/year in extra costs typically outweighs the SE tax savings. Above $100,000, the case becomes clear — savings routinely exceed $5,000–$8,000/year and widen as profit grows.
| Net profit | SE tax (LLC) | Payroll tax (S-Corp, $60k salary) | Gross savings | Net savings after admin costs |
|---|---|---|---|---|
| $60,000 | $8,478 | $9,180 | −$702 | Negative — don't elect yet |
| $80,000 | $11,304 | $9,180 | $2,124 | ~$0 after costs — borderline |
| $100,000 | $14,130 | $9,180 | $4,950 | ~$2,000–$3,000 net |
| $150,000 | $17,730* | $9,180 | $8,550 | ~$5,000–$7,000 net |
| $200,000 | $19,730* | $9,180 | $10,550 | ~$7,000–$9,000 net |
The 60/40 rule is a myth
You may have read that you can pay yourself 60% salary and take 40% as distributions. The IRS has no such rule. They require "reasonable compensation" — what you'd pay someone else to do your job. In 2025, the IRS significantly increased S-Corp payroll audits. Document your salary determination with BLS data or industry surveys.
When and how to elect S-Corp
The S-Corp election has specific deadlines. For an existing LLC electing S-Corp treatment for the current calendar year: file Form 2553 by March 15. For a newly formed LLC: file within 75 days of formation to apply S-Corp treatment from day one.
Missed the deadline? Late election relief is available under IRS Revenue Procedure 2013-30 for up to 3 years and 75 days retroactively. Your CPA can file with a reasonable cause statement — this works more often than most people expect.
- File IRS Form 2553 (Election by a Small Business Corporation)
- All shareholders must sign (just you for a solo founder)
- Choose your tax year (calendar year is standard)
- Set up payroll immediately — you must pay yourself a salary from the election date
- Keep a signed copy in your corporate records
State-specific considerations
Federal tax treatment is one piece. States add their own layer. California, for example, charges LLCs an annual $800 minimum franchise tax plus a gross receipts fee that kicks in above $250k. New York has its own filing requirements. Delaware is popular for C-Corps but adds complexity for single-state operators. Always verify your state's specific rules before forming.
Bottom line
| Your situation | Recommended structure |
|---|---|
| Just testing an idea, under $30k revenue | Sole prop — keep it simple |
| Real revenue, any amount | Single-member LLC — get the protection |
| Consistent net profit above $60–80k | LLC + S-Corp election |
| Raising venture capital or planning QSBS exit | Delaware C-Corp |
The single-member LLC is the right home base for most solo founders. It costs almost nothing to form, provides real liability protection, and gives you the option to layer on the S-Corp election when your profit justifies it. Don't over-engineer it at the start — but don't ignore it either.
Frequently asked questions
- What is the best business entity for a solo founder?
- For most solo founders, a single-member LLC is the right starting structure. It provides personal liability protection, costs little to form, and lets you add an S-Corp tax election later when your net profit consistently exceeds $60,000–$80,000 per year.
- When should a solo founder elect S-Corp status?
- The S-Corp election typically makes sense when your business net profit exceeds $60,000–$80,000 per year. Below that threshold, the payroll administration costs (roughly $1,500–$3,000/year) often exceed the self-employment tax savings. Consult a CPA for your specific numbers.
- What is the difference between an LLC and an S-Corp?
- An LLC is a legal structure that provides liability protection. An S-Corp is a tax election — you can have an LLC that is taxed as an S-Corp. With an S-Corp election, you pay yourself a reasonable salary (subject to payroll tax) and take the remaining profit as distributions (not subject to self-employment tax), which is the primary tax advantage.
- Can a solo founder be an S-Corp?
- Yes. A single-member LLC can elect to be taxed as an S-Corp by filing IRS Form 2553. The election must be filed by March 15 of the tax year you want it to take effect (or within 75 days of forming the entity for a new business).
Disclaimer: This article is general educational content and does not constitute legal or tax advice. Tax laws change and your specific situation may differ. Consult a qualified CPA or attorney before making tax or legal decisions. All figures reference IRS guidance current as of the publication date.