LLC vs. S-Corp vs. C-Corp: Which One Fits Your Business?
The structural decision that determines your tax bill for years. Honest comparison of LLC, S-Corp, and C-Corp — when each makes sense and the operational cost of each.
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TLDR
LLC is the default for almost everyone — flexible, easy, asset-protection without corporate complexity. S-Corp election (filed on top of an LLC) makes sense once net income clears ~$80K-100K because of self-employment tax savings. C-Corp only makes sense if you’re taking outside investment (VC, angel, institutional) or you genuinely need to retain large profits inside the entity at a 21% federal rate. For most owners, the answer is LLC → S-corp election when income justifies it.
In this guide, you’ll learn:
- See the five entity types every U.S. business operates under (and the default tax treatment of each)
- Understand when LLC, S-Corp election, and C-Corp each genuinely fit — and what they cost to operate
- Get the practical decision flowchart we run on every Discovery call
- Recognize the three narrow scenarios where C-Corp is actually the right answer (VC investment, retained profits, QSBS §1202)
- Avoid the “form in Delaware by default” mistake that costs operating businesses real money
#The decision frame
Every business in the U.S. operates as one of these entity types:
- Sole proprietorship — default if you do nothing
- Partnership — default if 2+ people do nothing together
- Limited Liability Company (LLC) — formed at the state level
- S-Corporation — a tax election available to LLCs or corporations
- C-Corporation — a separately incorporated entity, taxed as its own taxpayer
Most owner-operators have a single optimal answer, and most are choosing wrong because they picked based on a friend’s advice or what LegalZoom recommended on the day they formed.
#LLC (Limited Liability Company)
What it is: A state-law entity that gives you asset protection (your business assets are separate from your personal assets) and operational flexibility. By default, a single-member LLC is taxed as a sole proprietorship; a multi-member LLC is taxed as a partnership.
When it makes sense: Almost always, as the foundation. The LLC is rarely the wrong answer for the legal structure. The question is what tax election you make on top of it.
Cost to operate: State filing fee + annual report ($100-$300/yr depending on state). In Texas, the franchise tax + Public Information Report on top of formation. Minimal operational complexity.
Tax treatment: Single-member LLC defaults to Schedule C (sole prop) on your 1040. Multi-member LLC defaults to partnership (Form 1065). Either can elect S-corp or C-corp tax treatment.
When NOT to use: Rental real estate sometimes belongs in a different structure (DST, partnership-LLC with multiple owners). Pure passive holding might be a trust. Some professional services have state-specific PLLC requirements.
#S-Corp Election (filed on an LLC or Corporation)
What it is: A federal tax election (Form 2553) that changes how the entity is taxed. The entity itself can still be an LLC at the state level — the S-corp is purely a tax classification.
When it makes sense: Net business income clears ~$80K–$100K and you can document reasonable compensation for the owner. The election typically saves $5K-$30K/yr in self-employment tax depending on income level.
Cost to operate: Running payroll for the owner (~$40-$80/mo via Gusto). Reasonable comp documentation maintenance. Slightly more complex tax return (Form 1120-S + K-1s). Net operational cost is real but small compared to the savings.
Tax treatment: Owner pays themselves W-2 wages subject to payroll tax. Remaining net income flows to owners via K-1 as distribution income — not subject to self-employment tax.
When NOT to use: Net income under ~$80K (math doesn’t work). Rental real estate (distribution rules + loss passthrough don’t work). Multiple owners with materially different operating roles (partnership taxation is cleaner). Taking outside investment (VCs want C-corp).
#C-Corporation
What it is: A separately incorporated entity that’s taxed as its own taxpayer at the 21% federal rate. Owners are shareholders; income flows to them only as W-2 wages or dividends.
When it makes sense: Three scenarios, all narrow.
(1) Taking outside investment. VC funds and most institutional investors require C-corp structure (typically Delaware C-corp) for legal reasons — they can’t be in pass-through entities for fund-structure reasons.
(2) Genuinely retaining large profits inside the entity. If you’re building up working capital or reinvesting heavily in operations and don’t need to take the cash out personally, the 21% federal C-corp rate beats the 32-37% personal rate.
(3) QSBS Section 1202 planning. Founders of qualified small business C-corps can exclude up to $10M (or 10× basis) of federal capital gains on sale after a 5-year hold. For SaaS founders planning an exit, this can be a six- or seven-figure benefit.
Cost to operate: Much higher than LLC or S-corp. Separate tax return (Form 1120). Double taxation if you distribute earnings as dividends (corp pays 21%, then dividends are taxed again at 15-20%). Delaware franchise tax + state-level filings. Often $2K-$5K/yr in compliance costs alone.
Tax treatment: Entity-level 21% federal tax. Dividends to shareholders taxed at qualified-dividend rates. Owner compensation via W-2 wages (subject to payroll tax).
When NOT to use: Almost everywhere except the three scenarios above. For 95% of small businesses, C-corp is the wrong answer.
#The three structures at a glance
| LLC | S-Corp | C-Corp | |
|---|---|---|---|
| What it is | A state-law entity with asset protection and flexible tax treatment | A federal tax election filed on top of an LLC or corporation | A separately incorporated entity, taxed as its own taxpayer |
| When it fits | Almost always, as the foundation | Net income clears ~$80K-$100K with documented reasonable comp | Taking outside investment, retaining large profits, or QSBS §1202 planning |
| Cost to operate | $100-$300/yr filing + annual report; minimal complexity | Owner payroll (~$40-$80/mo) + Form 1120-S; small vs. the savings | $2K-$5K/yr; separate Form 1120 + Delaware franchise tax |
| Tax treatment | Pass-through: Schedule C (single) or Form 1065 (multi) | Owner W-2 wages taxed; K-1 distributions avoid SE tax | 21% federal entity tax; dividends taxed again at 15-20% |
| When NOT to use | Rental real estate, passive holding, or state PLLC cases | Under ~$80K net, rentals, unequal multi-owner roles, or VC-track | Almost everywhere outside the three narrow scenarios |
#Decision flowchart
Here’s the practical decision tree we run on every Discovery call:
The Discovery-call decision tree
Which structure fits your business?
- Taking outside investment in the next 24 months
C-Corp (Delaware)
VC funds and institutional investors require C-corp structure for fund-structure reasons.
- SaaS founder with a possible QSBS exit
C-Corp
QSBS §1202 can exclude up to $10M of gain after a 5-year hold. Start as a C-corp so the clock runs from formation.
- Net business income under $80K
LLC (sole-prop or partnership)
Below the break-even, the cost of S-corp payroll and compliance eats the savings.
-
Recommended
Net business income $80K-$10M+
LLC + S-corp election
Reasonable comp benchmarked + documented, payroll through Gusto. This is the answer for most owner-operators.
- Rental real estate
LLC, not S-corp
Hold rentals in an LLC taxed as a partnership or sole prop. Distribution and loss-passthrough rules break inside an S-corp.
- Multiple owners with different operating roles
LLC partnership
Partnership taxation handles unequal work and unequal pay far more cleanly than an S-corp's pro-rata rules.
For most owner-operators, the answer is the LLC + S-corp election once income justifies it.
For most owner-operators, the answer is the LLC + S-corp election. LLC at the state level, S-corp election on top, reasonable comp benchmarked + documented, payroll through Gusto.
#What about Delaware?
Delaware is the standard for venture-backed C-corps because of well-developed corporate case law + flexible chancery courts. For an LLC operating in Texas with Texas customers, Delaware adds cost (Delaware franchise tax + Delaware annual reports + Texas registration as foreign LLC) without operational benefit. Form in the state where you actually do business, unless you’re VC-track.
#Common questions
Can I change entity types later? Yes, but with friction. LLC to S-corp is easy (just file Form 2553). S-corp to LLC partnership requires liquidation analysis and can trigger built-in-gains tax. LLC to C-corp requires the conversion + can be structured tax-free under specific rules. Pick the right structure from the start when possible.
What about the 5-year QSBS clock — can I convert later? Theoretically yes, but the QSBS holding period starts at the qualified entity formation. If you operate as an LLC for 3 years then convert to C-corp, your QSBS clock starts at conversion — not at original formation. If QSBS is in the plan, start as a C-corp.
Do all states recognize the S-corp election? Most do (the federal election automatically applies at the state level). A few states (California, New Jersey, New York) require a separate state-level S-corp election. We handle this where applicable.
Can a single-member LLC be a partner in another partnership? Yes. A single-member LLC is a “disregarded entity” by default, which means it can hold partnership interests. Common structure for holdco / opco setups.
What’s a “Series LLC”? A series LLC is an LLC structure (available in ~17 states) where multiple “series” exist under one parent LLC, each with separate liability. Useful for real estate investors with multiple properties. We have a dedicated article on Series LLC coming.
If you’re forming a new business or restructuring an existing one, the Discovery call is the right next step. We model the right structure against your specific situation and quote the engagement.