Multi-Entity Comparison
C Corp vs S Corp vs Sole Proprietorship
A sole proprietorship is the default federal tax treatment for an individual running an unincorporated business. No filing fee, no separate return (just Schedule C on Form 1040), no payroll required. The decision to leave sole prop status comes down to liability protection plus the income threshold where S corp savings cover compliance.
Updated May 2026. Not tax advice.
The three-way verdict
Sole prop: simplest, cheapest, no liability protection. S corp: SE-tax savings above ~$80k profit, full liability protection, annual compliance ($1,800-2,500). C corp: rarely better than S corp for sole owners; reserve for VC-track or accumulated-earnings strategies.
Liability comes first
Sole proprietors have unlimited personal liability for business debts and lawsuits. Personal assets (home, savings, vehicles) are at risk. An LLC or corporation provides a liability shield: business creditors generally cannot reach owner's personal assets, subject to veil-piercing risk if entity formalities are not maintained.
For any business with employees, customers on premises, vehicles operated for business, or products that could cause injury, the liability protection from incorporating or forming an LLC is typically worth far more than the annual compliance cost. Tax considerations are secondary to liability considerations for risk-bearing businesses.
Tax comparison at common income tiers
Assuming single owner, 24 percent federal marginal bracket, no state tax for simplicity.
| Profit | Sole Prop SE tax | S Corp SE-tax saving (vs sole prop) | S Corp compliance | Net S Corp gain |
|---|---|---|---|---|
| $50,000 | $7,065 | ~$0 | $1,800 | -$1,800 |
| $80,000 | $11,304 | ~$2,295 | $2,000 | +$295 |
| $120,000 | $16,956 | ~$6,120 | $2,200 | +$3,920 |
| $200,000 | $23,650 (capped) | ~$13,770 | $2,400 | +$11,370 |
Indicative. Assumes defensible reasonable salary based on BLS OEWS data. Compliance figure is industry-typical payroll + 1120-S prep. Actual saving varies with state, occupation, and salary defensibility.
What sole prop loses vs incorporated
- Liability protection (the biggest one; consult a business attorney)
- SE-tax savings opportunity (S corp only)
- Easier credit (lenders often prefer to lend to corporations or LLCs)
- Easier sale (selling an entity is cleaner than selling unincorporated assets)
- Retirement plan flexibility (some plans favor incorporated entities)
What sole prop gains vs incorporated
- Simplest possible compliance: Schedule C on personal return, no separate filing
- No state filing fees, no annual report, no registered agent
- QBI 199A deduction available (same as S corp pass-through)
- No reasonable salary requirement, no payroll, no W-2
- Easy to start, easy to stop
For very small businesses (under $50k profit), part-time gigs, freelancers, and pre-traction founders, sole prop typically wins on cost and simplicity. The savings from incorporating are real but small at that level.
The "LLC for liability, sole prop for tax" path
A single-member LLC at the state level, with default disregarded entity tax treatment, gives you LLC liability protection AND sole-prop tax simplicity (still Schedule C, no separate federal filing). For most pre-S-election founders, this is the right starting point: liability shield with no additional federal compliance, then S election later when profit warrants.
See C corp vs S corp vs LLC for the entity-type framing.
Sources
- IRS Sole Proprietorships
- IRS Schedule C (Form 1040)
- 26 U.S.C. Section 1402 (SE tax)
- 26 U.S.C. Section 199A (QBI deduction)
Educational only. Entity choice involves liability and tax tradeoffs. Consult a business attorney and CPA.