Business Entity Selection: How to Choose an LLC, S-Corp, C-Corp, Partnership, or Sole Proprietorship
The structure you pick decides how your profit is taxed, whether your personal assets are protected, and how easily you can raise money. This guide compares the five main entity types side by side - then shows how reviewed advisory support turns the decision into a clear recommendation.
What Is a Business Entity?
A business entity is the legal form your business takes when it is created - sole proprietorship, partnership, LLC, S-corporation, or C-corporation. That form determines who is liable for the business's debts, how its income is taxed, who can own it, and how it raises capital.
Business entity selection is the decision that locks those answers in. Pick a sole proprietorship and you keep things simple but put your house and savings on the line for every business debt. Pick a C-corporation and you gain a clean structure for outside investors but accept two layers of tax. Most owners land somewhere in between, and the right answer depends on a handful of factors that are easy to weigh once you can see them side by side.
The choice is not permanent - you can convert later - but changing entities mid-stream carries its own tax cost. Getting it right at formation, or at least understanding the tradeoffs, saves money and avoids restructuring headaches down the road.
The 5 Main Types of Business Entities
Plus three more structures worth knowing. Each one trades liability protection, taxation, and complexity differently.
Sole Proprietorship
One owner, no separate legal entity. The default when an individual starts doing business without filing anything.
- Liability: None - your personal assets are fully exposed.
- Tax: Pass-through; profit on your Schedule C, subject to self-employment tax.
- Best for: Solo, low-risk side businesses testing an idea.
- Watch-out: No liability shield and no easy way to bring in partners or investors.
Partnership (GP, LP, LLP)
Two or more owners. A general partnership forms automatically; LPs and LLPs add liability protection for some or all partners.
- Liability: General partners exposed; LP and LLP structures shield limited or professional partners.
- Tax: Pass-through on Form 1065 with K-1s to each partner.
- Best for: Multi-owner ventures and professional practices.
- Watch-out: Partner disputes and joint liability in a plain general partnership.
Limited Liability Company (LLC)
A flexible state entity that shields owners' personal assets. A single-member LLC is treated as a disregarded entity by default.
- Liability: Limited - personal assets protected if formalities are kept.
- Tax: Pass-through by default; can elect S-corp or C-corp taxation.
- Best for: Most small and growing businesses wanting protection plus flexibility.
- Watch-out: Default LLC owners pay self-employment tax on all net profit.
S Corporation
Not a separate entity but a tax election made by an LLC or corporation on Form 2553, designed to cut self-employment tax.
- Liability: Limited (from the underlying LLC or corporation).
- Tax: Pass-through; owner-employees take a reasonable salary plus distributions.
- Best for: Profitable owner-operated businesses past the SE-tax break-even point.
- Watch-out: 100-shareholder cap, U.S.-individual owners only, payroll required.
C Corporation
A fully separate taxpaying entity with shareholders. The default structure for venture-backed companies.
- Liability: Strongest - shareholders are insulated from company debts.
- Tax: Taxed at the flat 21% corporate rate; dividends taxed again to owners.
- Best for: Startups raising venture capital or planning broad equity grants.
- Watch-out: Double taxation, and the heaviest compliance and recordkeeping load.
B-Corp, Nonprofit, Co-op
Special-purpose structures for specific missions and ownership models.
- Benefit corporation: A for-profit corporation with a stated public-benefit purpose.
- Nonprofit corporation: Mission-driven, eligible for tax-exempt status under 501(c)(3).
- Cooperative: Owned and democratically controlled by its members.
- Best for: Social enterprises, charities, and member-owned organizations.
Business Entity Comparison Chart - LLC vs S-Corp vs C-Corp vs Partnership vs Sole Proprietorship
The full picture in one table. This is the chart most guides leave out.
| Factor | Sole Proprietorship | Partnership | LLC | S-Corp | C-Corp |
|---|---|---|---|---|---|
| Liability protection | None | Limited (LP/LLP) to none (GP) | Yes | Yes | Strongest |
| Federal taxation | Pass-through | Pass-through (Form 1065) | Pass-through by default | Pass-through (election) | 21% corporate, then dividends |
| Double taxation | No | No | No (unless C-corp election) | No | Yes |
| Self-employment tax | On all profit | On active partners' share | On all profit (default) | Only on salary | N/A (W-2 wages) |
| 20% QBI deduction | Yes (with limits) | Yes (with limits) | Yes (with limits) | Yes (with limits) | No |
| Ownership limits | One owner | Two or more | Unlimited, any type | Max 100, U.S. individuals | Unlimited, any type |
| Raising outside capital | Very hard | Limited | Moderate | Limited (one stock class) | Easiest (VC-ready) |
| Formation & upkeep | Minimal | Low to moderate | Moderate | Moderate (payroll required) | Highest |
| Best for | Solo, low-risk | Multi-owner practices | Most small businesses | Profitable owner-operators | Venture-backed startups |
Rates, thresholds, and state rules change. Treat this chart as a starting framework and confirm the numbers for your year and facts.
LLC vs. Sole Proprietorship: When Liability Protection Is Worth It
For most new owners this is the first real decision, and it usually comes down to one question: is what you could lose worth the small cost of an LLC?
A sole proprietorship is the default. Start working for yourself and you are one already, with nothing to file. It is simple and cheap, but there is no legal line between you and the business: if the business is sued or owes money it cannot pay, your personal assets, home, savings, car, are exposed.
An LLC draws that line. It creates a separate legal entity, so in most cases a claim against the business stops at the business. You take on a little more: a state filing, a fee, and the discipline of keeping business and personal money separate, the formality that actually preserves the protection. By default an LLC is taxed the same as a sole proprietorship, so the choice is usually about liability, not taxes.
The rule of thumb: the moment the business has real customers, contracts, employees, debt, or assets worth protecting, the LLC earns its keep. Below that, a sole proprietorship may be fine for a while. Confirm the specifics for your state and situation; fees and rules vary.
LLC vs S-Corp vs C-Corp - The Three That Trip People Up
LLC vs S-corp. This is the most-searched comparison, and the trick is that it is not really apples to apples. An LLC is a legal entity; an S-corp is a tax election that an LLC can make. The reason owners elect S-corp status is self-employment tax. A default LLC pays roughly 15.3% SE tax on every dollar of profit, while an S-corp owner pays payroll tax only on a reasonable salary and takes the remaining profit as distributions that escape SE tax. The catch is that payroll, an extra return, and the cost of running it only pay off once profit is high enough - often around the point where SE-tax savings clear several thousand dollars a year.
S-corp vs C-corp. Both are corporations on paper, but they are taxed in opposite ways. An S-corp passes income straight to owners and avoids entity-level tax; a C-corp pays the 21% corporate tax and then owners pay again on dividends. C-corps win when you plan to keep earnings inside the company, grant stock options broadly, take outside investment, or position for the qualified small business stock (QSBS) gains exclusion under Section 1202. For a tightly held, owner-operated business that distributes its profit, the S-corp is usually the cheaper path.
LLC vs C-corp. For most small businesses, the LLC's pass-through taxation and lighter paperwork beat the C-corp's double taxation. The C-corp earns its keep when fundraising is the goal: venture investors expect Delaware C-corps, and the structure handles multiple share classes and equity compensation cleanly. If you are not raising money, an LLC - taxed as itself or as an S-corp once you are profitable - is the simpler, lower-tax choice. Our S-corp tax preparation and tax planning teams model these tradeoffs with real numbers.
How to Choose the Right Business Entity - A 6-Factor Framework
Work through these in order. The first factor that clearly rules an option out usually points you to the answer.
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1. Liability exposure
How much can go wrong, and would a lawsuit reach your personal assets? Any real risk pushes you past a sole proprietorship toward an LLC or corporation.
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2. Tax treatment and self-employment tax
Pass-through avoids double taxation; an S-corp election cuts SE tax once you are profitable. Map your expected profit against the SE-tax break-even before deciding.
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3. Ownership and who can own it
S-corps cap you at 100 U.S. individual shareholders with one class of stock. LLCs and C-corps allow unlimited owners of any type, including other entities and foreign investors.
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4. Fundraising plans
If venture capital or broad equity grants are on the horizon, a C-corp is almost required. If you are self-funding or borrowing, an LLC keeps things simple.
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5. Administrative tolerance
C-corps demand the most formalities and filings; sole proprietorships the least. Be honest about how much paperwork and payroll you will actually maintain.
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6. State and multi-state footprint
Franchise taxes, annual fees, and foreign-registration rules vary widely by state. Where you form and operate changes the total cost more than most owners expect.
Common Entity-Selection Mistakes
Defaulting to an LLC without modeling tax
An LLC is the easy answer, but skipping the SE-tax math can cost a profitable owner thousands a year that an S-corp election would have saved.
Electing S-corp status too early or too late
Elect before you are profitable and you pay payroll cost for no benefit; elect too late and you miss SE-tax savings. The break-even point and the Form 2553 deadline both matter.
Ignoring state franchise tax and fees
A structure that looks cheap federally can carry a steep state franchise tax or annual fee. Forming in the wrong state quietly raises your cost every year.
Mismatching the entity to a fundraising path
Investors expect a C-corp. Raising venture money as an LLC usually forces a conversion later, often at an inconvenient and taxable moment.
Letting the liability shield lapse
Mixing personal and business funds or skipping formalities lets a court pierce the corporate veil, erasing the protection you formed the entity to get.
Treating the decision as permanent
Your needs change as you grow. Reviewing the structure every few years catches the moment an LLC should become an S-corp, or an S-corp should convert.
Entity Selection by Situation
The same factors land differently depending on where you are. A few common starting points.
Freelancers & solo owners
Low-risk work can run as a sole proprietorship, but a single-member LLC adds a liability shield for little extra effort. Once net profit climbs into the high five figures, an S-corp election starts to pay for itself.
Typical path: Sole prop → LLC → S-corp electionGrowing small businesses
An LLC is the usual home base - protection plus flexibility. As profit and payroll grow, S-corp taxation trims self-employment tax, and multi-state operations make state research worth doing properly.
Typical path: LLC, with S-corp election when profitableStartups raising venture capital
If institutional investment is the plan, a Delaware C-corp is the expected structure. It handles preferred stock, option pools, and the QSBS exclusion cleanly, and avoids a costly conversion mid-raise.
Typical path: Delaware C-corp from day oneAccounting & advisory firms running this for clients
Firms handling entity selection at volume need consistent comparative models, state research, and recommendation memos for every client. Our offshore analysts produce that work inside your templates so your reviewers stay focused on the advice.
Support: offshore research + memo drafting at scaleHow Our Offshore Entity-Selection Team Supports Your Decision
When the chart is not enough, trained U.S.-led offshore analysts turn your specific numbers into a clear, reviewed recommendation - inside your systems.
Comparative Tax Analysis
Side-by-side tax impact across LLC, S-corp, and C-corp for the specific situation in front of you.
Multi-Year Projection Models
3-to-5 year projections showing the financial impact of each entity type under different growth scenarios.
State-by-State Research
Formation requirements, franchise taxes, annual fees, and compliance obligations across all 50 states.
Self-Employment Tax & Reasonable Comp
Detailed SE-tax savings analysis comparing structures, including reasonable-compensation modeling for S-corps.
Restructuring & Conversion Analysis
For owners considering a switch from one entity type to another - tax consequences and transition planning included.
Recommendation Memos
Clear, written recommendation memos summarizing the analysis, findings, and the selection rationale - ready for delivery.
Every deliverable runs through multi-layer review before it reaches you, and onboarding inside your software takes 2-3 weeks. Delivery is SOC 2 aligned.
We Work Inside Your Software
Our analysts train on your tech stack during onboarding - no migration needed.
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Certified TeamBNA Income Tax Planner
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Certified Team+ Any Other
We'll TrainIn-House vs. Offshore Entity Research
Entity-selection research at senior rates runs $200-$400 an hour, and a single analysis takes 8-12 hours. With offshore support, trained analysts handle the modeling and memo drafting while your reviewers focus on the decision - at a fraction of the cost.
| Comparison | U.S. In-House Research | Accountably |
|---|---|---|
| Senior Tax Advisor (Annual) | $120,000 - $180,000 | $36,000 - $48,000 |
| Research Analyst (Annual) | $75,000 - $95,000 | $28,000 - $36,000 |
| Time to Productivity | 3-6 months | 2-3 weeks |
| Multi-State Research Capability | Varies by hire | ✓ Standard |
| Entity Comparison Templates | Built ad-hoc | ✓ Standardized |
| Backup Coverage | ✗ No coverage | ✓ Always covered |
| Memo Drafting | Senior time | ✓ Analyst-drafted, reviewed |
| Turnover Risk | High | ✓ 98.7% retention |
How One Advisory Practice Tripled Its Entity-Selection Capacity
The firm was bottlenecked because every entity-selection engagement needed custom tax modeling only senior people could build. One offshore research analyst now handles the comparative analysis and memo drafting - cutting turnaround from two weeks to four days and freeing the team for the actual advice. The practice now closes roughly three times as many engagements per quarter.
"Our team went from ten hours per engagement on spreadsheets to two hours on the strategy conversation. That's exactly where they should be."
- Practice Partner, U.S. advisory firmBusiness Entity Selection FAQ
The questions that come up most when choosing between an LLC, S-corp, C-corp, partnership, and sole proprietorship.
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