Choosing the right business structure affects your taxes, personal liability, and operational complexity. Here’s a clear comparison of the most common options.
Business Structures Compared
| Feature | Sole Proprietorship | LLC | S-Corp | C-Corp |
|---|---|---|---|---|
| Personal liability protection | No | Yes | Yes | Yes |
| Formation filing | None | State filing ($50-$500) | State filing + IRS election | State filing + IRS filing |
| Tax treatment (default) | Personal return (Schedule C) | Personal return | Personal return | Corporate return (Form 1120) |
| Double taxation | No | No | No | Yes (corporate + dividend) |
| Self-employment tax | Yes (all net income) | Yes (all net income) | Only on salary | N/A (payroll tax on wages) |
| Ownership restrictions | 1 owner | Unlimited | 100 max, US residents only | Unlimited |
| Can raise venture capital | Rarely | Possible | Difficult | Yes (preferred structure) |
| Annual compliance | Low | Low | Medium | High |
| Best for | Side hustles, freelancers | Small businesses, most startups | Profitable small businesses | VC-funded startups, large companies |
Tax Comparison: The Numbers
Self-Employment Tax Savings (S-Corp vs. LLC)
For a business with $120,000 in net profit, owner pays themselves a $60,000 salary:
| Structure | Income | Payroll/SE Tax Owed | Income Tax Owed | Additional Costs | Net Tax Savings |
|---|---|---|---|---|---|
| Sole Prop/LLC | $120,000 | $16,956 (15.3% SE tax on ~$110,700) | ~$17,000 | $0 | — |
| S-Corp | $120,000 | $9,180 (7.65% employer + 7.65% employee on $60K) | ~$17,000 | $2,000-$3,000 (payroll/compliance) | $4,776-$5,776 |
The S-Corp saves approximately $5,000/year at this income level.
Self-Employment Tax Savings by Income Level
| Net Profit | LLC SE Tax | S-Corp Payroll Tax* | Annual Savings |
|---|---|---|---|
| $40,000 | $5,652 | $4,590 | $1,062 |
| $60,000 | $8,478 | $5,355 | $3,123 |
| $80,000 | $11,304 | $5,738 | $5,566 |
| $100,000 | $13,817 | $6,885 | $6,932 |
| $150,000 | $18,870 | $8,415 | $10,455 |
| $200,000 | $22,222 | $9,945 | $12,277 |
*Assumes reasonable salary of 50-60% of profits.
C-Corp Double Taxation
| Stage | Amount | Tax Rate | Tax Paid |
|---|---|---|---|
| Corporate profit | $100,000 | 21% (corporate rate) | $21,000 |
| After-tax profit | $79,000 | — | — |
| Dividend to owner | $79,000 | 15% (qualified dividend) | $11,850 |
| Total tax paid | $32,850 (32.9% effective) | ||
| S-Corp comparison | $100,000 | ~24% (individual rate) | ~$24,000 |
C-Corp double taxation costs $8,850 more in this example.
When Each Structure Makes Sense
Sole Proprietorship
| Best When | Not Ideal When |
|---|---|
| Side hustle earning under $20K | Any significant liability exposure |
| Testing a business idea | Income exceeding $40K/year |
| No employees, no partners | Working with clients who require LLC/Corp |
LLC
| Best When | Not Ideal When |
|---|---|
| Starting a small business | Seeking VC funding |
| Need liability protection | Net profit consistently over $50K (consider S-Corp) |
| Simple, flexible structure | Need multiple share classes |
| Multiple members/partners |
S-Corp (or LLC Taxed as S-Corp)
| Best When | Not Ideal When |
|---|---|
| Net profit over $50K/year | Fewer than 100 shareholders needed |
| Want to reduce self-employment tax | Non-US shareholders |
| Owner actively works in business | Plan to go public |
| Profitable, stable business | Need to retain large earnings at low rate |
C-Corp
| Best When | Not Ideal When |
|---|---|
| Raising venture capital | Small service businesses |
| Planning for IPO | Owner wants to distribute all profits |
| Need multiple share classes | Want simplicity |
| Want to retain earnings at 21% rate | |
| International shareholders |
The Bottom Line
Start as a sole proprietorship or LLC for simplicity. When net profits consistently exceed $50,000, elect S-Corp tax treatment to save on self-employment taxes—it can save $5,000-$12,000+ per year. C-Corps are primarily for companies seeking outside investment or planning for significant scale. The right structure depends on your income level, growth plans, and willingness to handle additional compliance.