Legal and tax disclaimer: This guide provides general educational information about business structures. Business entity laws vary by state. Tax implications depend on your specific income level, industry, and circumstances. Consult an attorney and a CPA before forming a business entity or making a tax election.
The Four Business Structures at a Glance
Sole Proprietorship
Default status / no filing required
Simplest
LiabilityNo protection — personal assets at risk
TaxesPass-through; self-employment tax on all profit
PaperworkAlmost none
FundingHarder; personal and business often mixed
Best forTesting a side hustle; very low-revenue operations
LLC
Limited Liability Company
Most Popular
LiabilityPersonal assets protected
TaxesPass-through by default; S-Corp election possible
PaperworkLow — state filing + annual report
FundingExcellent — lenders prefer formal entity
Best forMost small businesses; first formal entity
S-Corp
IRS tax election on LLC or Corp
Tax Saver
LiabilityPersonal assets protected
TaxesPass-through; self-employment tax on salary only
PaperworkModerate — payroll required, IRS Form 2553
FundingGood — well-recognized by lenders
Best forProfitable businesses earning $40K+ net annually
C-Corp
Corporation
Complex
LiabilityPersonal assets protected
TaxesDouble taxation — corp pays 21%, dividends taxed again
PaperworkHigh — board minutes, bylaws, separate filing
FundingBest for VC / equity investment
Best forBusinesses seeking outside equity investors or going public
Side-by-Side Comparison
| Factor | Sole Prop | LLC | S-Corp | C-Corp |
|---|---|---|---|---|
| FORMATION & COMPLIANCE | ||||
| Formation paperwork | None | Articles of Organization | LLC/Corp + IRS Form 2553 | Articles of Incorporation |
| State filing fee | $0 | $50–$500 | $50–$500 + IRS filing | $50–$500 |
| Annual compliance | Minimal | Annual report | Payroll, annual report, Form 1120-S | Board minutes, bylaws, Form 1120 |
| Personal liability protection | None | Yes | Yes | Yes |
| TAXATION | ||||
| Federal tax structure | Pass-through (Schedule C) | Pass-through (Schedule C or K-1) | Pass-through (K-1; salary on W-2) | Corporate (21% flat) + dividend tax |
| Self-employment tax | On all profit (15.3%) | On all profit (15.3%) | On salary only — not distributions | Owner pays FICA as employee only |
| Double taxation risk | None | None | None | Yes — corp profit taxed, dividends taxed again |
| Qualified Business Income (QBI) deduction | Up to 20% | Up to 20% | Up to 20% | Not available |
| BUSINESS FUNDING | ||||
| MCA / Working Capital Advance | Possible, but harder | Yes — preferred | Yes — preferred | Yes |
| SBA 7(a) loan eligibility | Yes, with EIN | Yes | Yes | Yes |
| Business credit building | Difficult | Good | Good | Excellent |
| Bank business checking account | Yes (with DBA) | Yes | Yes | Yes |
| Investor equity funding | Very difficult | Possible, limited | Yes, limited (100 shareholders max) | Yes — VC, angel, stock issuance |
The S-Corp Tax Advantage — How the Math Works
The S-Corp tax election's key benefit is reducing self-employment (SE) tax. Here's a concrete example:
LLC (default / no S-Corp election)
Net business profit$120,000
Self-employment tax (15.3% on ~92.35%)($17,013)
SE tax deduction (half of SE tax)−$8,507
Taxable income (at 22% bracket)($24,530)
Total federal tax burden~$41,543
S-Corp Election (salary + distributions)
Net business profit$120,000
Reasonable W-2 salary (owner)$60,000
FICA on salary (15.3% shared)($9,180)
Distribution (remaining $60K)$60,000
No SE tax on distribution$0
Income tax on total (~22%)($20,570)
Total federal tax burden~$29,750
Estimated savings vs. LLC~$11,793
Illustration only. Actual tax liability depends on deductions, state taxes, payroll costs, and other factors. Consult a CPA for your specific situation. Reasonable salary requirements are enforced by the IRS — you cannot set salary to $1 to avoid FICA.
How Your Business Structure Affects Funding
Merchant Cash Advances (MCA)
MCA underwriting is primarily based on bank deposit history — not business structure. However, structure matters in two ways:
- Separate bank account is critical — regardless of structure. Sole proprietors who deposit business revenue into personal accounts make MCA underwriting very difficult. Open a dedicated business checking account immediately, even as a sole proprietor.
- EIN (Employer Identification Number) preferred — most MCA providers want a business EIN. Sole proprietors can use their SSN but this creates a direct link to personal credit. An LLC with a separate EIN is cleaner for MCA applications.
SBA 7(a) Loans
SBA 7(a) loans are available to all four structure types (with EIN). The structure affects two things:
- Personal guarantee requirement — SBA 7(a) requires a personal guarantee from any owner holding 20%+ equity. This applies regardless of LLC or corporate structure — the liability protection of the entity doesn't protect you from the personal guarantee.
- Financial statement preparation — LLCs and S-Corps filing as pass-through entities need business tax returns (Schedule C or Form 1120-S) plus personal tax returns. C-Corps need corporate returns (Form 1120) only — but the added complexity and double taxation rarely make C-Corp the right choice for small businesses seeking SBA loans.
Building Business Credit
To build a separate business credit profile (PAYDEX, Intelliscore, Equifax Business), you need:
- A formal business entity with a name (LLC, Corp, or even DBA with EIN)
- A DUNS number (free at dnb.com)
- Trade references reporting to D&B or Experian Business
Sole proprietors cannot build truly separate business credit without a DBA and EIN. An LLC provides the cleanest foundation for business credit building.
Which Structure Should You Choose?
- New business / testing a concept / under $20K revenue: Sole proprietorship to start — keep it simple. Open a separate bank account. Get an EIN. Convert to LLC once the business proves itself.
- Established small business, ready for formalization: LLC. It's the sweet spot of protection, simplicity, and funding access for the vast majority of small businesses.
- Profitable LLC earning $40K+ net annually: Consider the S-Corp election with your CPA. The tax savings can be significant at this income level — potentially $5K–$15K+ per year.
- Seeking venture capital or angel investment, planning to offer equity to employees: C-Corp (typically Delaware). VCs strongly prefer C-Corps for the stock structure flexibility.
The #1 mistake: waiting too long to form an LLC
Many small business owners operate as sole proprietors for years to "avoid paperwork." But every day they operate without an LLC, their personal assets (house, car, personal bank account) are fully exposed to business lawsuits, vendor disputes, and customer claims. In most states, forming an LLC costs $100–$300 and takes one hour. The liability protection it provides is worth far more than the paperwork burden.
Frequently Asked Questions
- What is the difference between an LLC and an S-Corp?
- An LLC is a legal entity type (formation with your state). An S-Corp is an IRS tax election — not a separate legal structure. An LLC can elect to be taxed as an S-Corp by filing IRS Form 2553. The practical difference: an S-Corp requires the owner to receive a "reasonable salary" as a W-2 employee, with FICA taxes on that salary only — not on the remaining profit distributed. This can save significant self-employment taxes at higher income levels (generally above $40,000–$50,000 in net profit).
- Which business structure is best for getting a business loan?
- LLCs and S-Corps are the most common and preferred structures for business lending. Both allow clear separation of business and personal finances, both have EINs, and both have recognizable legal structures that lenders are comfortable with. For MCAs specifically, the most important factor is having a dedicated business bank account — not the specific structure. For SBA loans, LLCs and S-Corps are equally well-positioned. C-Corps are fine for bank loans but add complexity. Sole proprietors can qualify for MCAs and SBA loans but should have a dedicated business bank account and EIN.
- Should I be an LLC or S-Corp for tax purposes?
- The S-Corp election starts making financial sense once your business consistently earns $40,000–$50,000 or more in net profit annually. Below that, the cost of S-Corp compliance (running payroll, additional tax filings, accountant fees) typically exceeds the tax savings. Above $80,000–$100,000 in net profit, the savings become substantial — potentially $8,000–$15,000 per year. The exact crossover point depends on your reasonable salary amount, state taxes, and other deductions. Consult a CPA for a personalized analysis.
- Can a sole proprietor get a merchant cash advance?
- Yes. MCA underwriting is primarily based on bank deposit history and a minimum personal FICO score (typically 500+). Sole proprietors can qualify — but the key is having a dedicated business bank account where all business revenue is deposited. If business and personal deposits are mixed in the same account, underwriters cannot accurately assess business revenue, which typically results in lower advance amounts or denial. Opening a separate business checking account, even as a sole proprietor, significantly improves MCA approval odds and amounts.