Most business owners choose their initial entity structure based on convenience or habit — their attorney suggested an LLC, or their accountant set up an S corp years ago. For small or early-stage businesses, those defaults are often reasonable. For businesses generating $500,000 or more annually, or businesses approaching a sale, the entity structure has significant tax, estate, and exit implications that deserve a deliberate analysis.
The Four Structures in Practice
There are four structures that matter in practice: sole proprietorship/single-member LLC (disregarded entity), multi-member LLC taxed as a partnership, S corporation, and C corporation. Each has a different tax treatment, a different compliance burden, and a different interaction with estate planning.
Single-Member LLC (Disregarded Entity)
A single-member LLC owned by an individual is ignored for federal income tax purposes. The owner reports business income and expenses directly on Schedule C of their personal 1040. All net income is subject to self-employment tax (15.3% on the first $160,200 and 2.9% above that in 2024) as well as income tax. There is no payroll, no separate return, and minimal compliance burden — but the self-employment tax cost is substantial at higher income levels.
Best for: Early-stage businesses, freelancers, and businesses with lower net income where the simplicity and flexibility outweigh the SE tax cost.
S Corporation
An S corporation passes income and losses through to shareholders who report them on their personal returns — avoiding entity-level income tax. The critical difference from a disregarded LLC is that owner-employees must be paid a "reasonable salary," and only that salary is subject to payroll taxes. Distributions above the salary are not subject to self-employment tax, creating potential Social Security/Medicare tax savings.
On $400,000 of net business income, the S corp owner might take a $150,000 salary (subject to payroll taxes) and $250,000 in distributions (not subject to payroll taxes). The SE tax savings on $250,000 — at 2.9% — is $7,250 annually. More meaningful at higher income levels. Less so at lower ones when you account for the added compliance cost.
Maximum 100 shareholders — only U.S. citizens and residents as shareholders.
One class of stock only — cannot have preferred and common shares.
No corporate shareholders — S corps cannot be owned by other corporations or most trusts.
QSBS exclusion not available — Section 1202 requires a C corporation.
C Corporation
A C corporation is a separate taxpaying entity. It pays the flat 21% corporate rate on its taxable income. Shareholders pay tax again when dividends are distributed — the classic "double taxation" concern. However, for businesses that retain earnings, are building toward a QSBS-eligible exit, or have specific capital structure needs, the C corp is not just the worst option by default.
The QSBS exclusion under Section 1202 — which allows up to $15 million of capital gains to be excluded from federal income tax on exit — is available only to original shareholders of qualifying C corporations. For a business expected to exit at $10 million or above, the QSBS analysis alone can override the double taxation concern entirely.
Additionally, C corporations can have multiple classes of stock, institutional investors, unlimited shareholders, and cleaner equity compensation structures — all of which matter for venture-backed businesses or those planning institutional raises.
Partnership (Multi-Member LLC)
A multi-member LLC taxed as a partnership avoids entity-level tax while allowing far more flexibility than an S corporation — different economic allocations for different partners, preferred return structures, and the ability to have corporate partners. This is the standard structure for real estate investment vehicles, private equity, and family limited partnerships used in estate planning.
| Factor | LLC (Disregarded) | S Corp | C Corp | Partnership |
|---|---|---|---|---|
| Self-employment tax on all income | Yes | Salary only | No | Yes (general partners) |
| Entity-level income tax | No | No | 21% | No |
| QSBS §1202 available | No | No | Yes | No |
| Multiple share classes | N/A | No | Yes | Yes (via units) |
| Estate planning flexibility | Limited | Moderate | High | High |
| Compliance burden | Low | Medium | Medium-High | Medium |
| QBI deduction available | Yes | Yes | No | Yes |
The Exit Planning Consideration
Entity choice significantly affects the tax treatment of a future sale. In an asset sale, C corporation shareholders face potential double taxation — the corporation pays tax on asset sale gains, then shareholders pay tax on the liquidating distribution. S corporation shareholders in an asset sale recognize gains at their personal rates but avoid the double layer. However, the QSBS exclusion available to C corp shareholders can eliminate the gain entirely for qualifying exits.
For businesses anticipating a sale within 5 to 10 years, the entity choice made today has compounding consequences. The analysis must happen before the business is worth what it will be worth at exit — not after.
When to Revisit the Current Structure
The entity structure chosen in year one is rarely the right structure indefinitely. Common triggers for revisiting: net income exceeds $500,000 and the S corp SE tax savings are meaningful; a co-founder or investor is joining and the S corp's shareholder restrictions become limiting; you are approaching a potential exit and QSBS analysis changes the calculus; or the business is being incorporated into a larger estate planning strategy involving FLPs or irrevocable trusts.
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Begin a ConversationThis article is for informational purposes only and does not constitute legal, tax, or financial advice. Tax laws change and individual circumstances vary. Consult a qualified tax professional before implementing any strategy discussed here.