S-Corp vs LLC vs Sole Proprietorship Tax 2026 — Self-Employment Tax, Section 199A QBI, Reasonable Salary
A solo consultant earning $200K net pays $30K self-employment tax as a sole proprietor. As an S-Corp with $100K reasonable salary, only $15.3K SE tax — saves $14.7K. Subtract $3K admin cost = $11.7K net savings. The S-Corp election break-even is $75K-$100K net income. Below: stick with LLC. Above: elect. This is the proprietary 2026 entity decision matrix: 8 entity types × income tier × QBI phase-outs × 8 reasonable salary scenarios × 8 multistate × 8 mistakes.
Income Tier Tax Comparison (Net Income)
| Net Income | Sole Prop Tax | LLC Default | S-Corp Tax | SE Savings | Admin Cost | Net Savings | Recommendation |
|---|---|---|---|---|---|---|---|
| $50,000 | $14,000 | $14,000 | $11,500 | $2,500 | -$2,000 | $500 | Sole Prop or LLC — S-Corp barely covers admin cost |
| $75,000 | $21,500 | $21,500 | $17,000 | $4,500 | -$2,500 | $2,000 | S-Corp marginal — case-by-case |
| $100,000 | $30,000 | $30,000 | $22,500 | $7,500 | -$2,500 | $5,000 | S-Corp generally better |
| $150,000 | $47,500 | $47,500 | $33,500 | $14,000 | -$3,000 | $11,000 | S-Corp clear winner |
| $200,000 | $65,500 | $65,500 | $45,500 | $20,000 | -$3,500 | $16,500 | S-Corp strongly recommended |
| $300,000 | $102,500 | $102,500 | $71,500 | $31,000 | -$4,000 | $27,000 | S-Corp essential |
| $500,000 | $180,500 | $180,500 | $130,500 | $50,000 | -$5,500 | $44,500 | S-Corp + entity stack |
| $1,000,000 | $380,000 | $380,000 | $290,000 | $90,000 | -$8,000 | $82,000 | S-Corp + multi-entity strategy |
8 Entity Types — Tax + Liability + Cost
Sole Proprietorship
Tax: Schedule C (Form 1040) · SE Tax: 15.3% · QBI: Yes
Formation: $0 · Annual: $0 · Liability: None — owner liable
Best for: Solo low-income; no liability concerns; <$50K net income
Simplest; no separate filing; full SE tax on entire profit
Single-Member LLC (SMLLC)
Tax: Schedule C unless taxed as S-Corp · SE Tax: 15.3% · QBI: Yes
Formation: $200 · Annual: $200 · Liability: Moderate — pierce-veil possible
Best for: Solo with assets to protect; same tax as sole prop
Liability shield; pass-through tax default; can elect S-Corp via Form 2553
Multi-Member LLC (Partnership)
Tax: Form 1065 + K-1 to partners · SE Tax: 15.3% · QBI: Yes
Formation: $300 · Annual: $500 · Liability: Moderate
Best for: 2+ owners; partnership taxation; K-1 distributions
Each partner pays SE tax on their distribution; QBI applies to active partners
S-Corporation
Tax: Form 1120-S + W-2 to owner · SE Tax: Reduced (only on salary portion) · QBI: Yes
Formation: $800 · Annual: $2,500 · Liability: Strong
Best for: Net income $75K-$500K typical; profitable solo professionals
Reasonable salary required; payroll + bookkeeping required; QBI applies after salary
C-Corporation
Tax: Form 1120 (corporate tax) · SE Tax: Salary subject to FICA only · QBI: No
Formation: $1,000 · Annual: $4,000 · Liability: Strongest
Best for: High-growth; venture-backed; multi-owner
Double taxation (corporate + dividend); 21% federal corporate rate
Multi-Member LLC + S-Corp Election
Tax: Form 1120-S + W-2 · SE Tax: Reduced · QBI: Yes
Formation: $800 · Annual: $3,000 · Liability: Strong
Best for: Multi-owner profitable business; owners want SE tax savings
Combines LLC liability shield + S-Corp tax benefit
Professional Corporation (PC)
Tax: Form 1120 or 1120-S · SE Tax: Varies · QBI: Limited (specified service trades)
Formation: $1,500 · Annual: $4,500 · Liability: Strong
Best for: Licensed professionals (doctors, lawyers, accountants)
State-specific requirements; some states limit ownership; SSTB QBI restrictions
Sole Member Disregarded LLC + 1099 contractor
Tax: Schedule C · SE Tax: 15.3% · QBI: Yes
Formation: $200 · Annual: $200 · Liability: Moderate
Best for: Single client; 1099 work; same as SMLLC
IRS treats as SP for tax; Common for consultants
Section 199A QBI Phase-Out Thresholds 2026
| Filing Status | Phase-Out Start | Full Phase-Out | SSTB > threshold | Non-SSTB > threshold |
|---|---|---|---|---|
| Single | $197,300 | $247,300 | 0% (specified service trade or business) | 20% subject to wage + property limitations |
| Married Filing Jointly | $394,600 | $494,600 | 0% | 20% subject to wage + property limits |
| Married Filing Separately | $197,300 | $247,300 | 0% | 20% subject to limits |
| Head of Household | $197,300 | $247,300 | 0% | 20% subject to limits |
8 Reasonable Salary Scenarios for S-Corp
Software Engineer (solo consultant)
Salary 50% — common for tech consultants
Doctor (solo practice, SSTB)
SSTB above QBI threshold = no QBI; only SE tax savings; salary often >70%
Real Estate Agent (solo)
Real estate licensed; service-based; reasonable salary 50-60%
Marketing Consultant
Service-based; salary 50-55%
E-commerce / Amazon Seller
Non-service; salary 40%; product business preserves more QBI
YouTube/Content Creator
Royalty + service mix; salary 33%; favorable QBI treatment
SaaS Founder (solo)
Software business; non-SSTB; salary 30%; large QBI
Lawyer (solo, SSTB)
SSTB + above threshold = no QBI; only SE tax savings; salary high
Multistate Considerations
State income tax on S-Corp pass-through
Most states tax S-Corp income at owner level via K-1
2026 Value: CA 13.3% top, NY 14.78% NYC, TX/FL 0%
Planning: Move to no-tax state if remote-eligible; consider domicile
Foreign LLC fees
CA $800 minimum LLC fee + 1.5% S-Corp franchise tax
2026 Value: Significant for CA
Planning: CA cost penalty for entity holding; some businesses use NV/WY LLC + foreign register
Texas margin tax
TX no income tax but 0.75% margin tax on revenue >$2.47M
2026 Value: Limited impact for solo
Planning: Watch revenue growth; use TX for solo + small businesses
Nexus + multistate sales tax
Selling in multiple states triggers tax nexus thresholds
2026 Value: Critical for e-commerce
Planning: Use TaxJar/Avalara; track $100K + 200 transaction thresholds
Salary attribution for remote workers
CA aggressive on remote workers; some states have day-presence rules
2026 Value: Audit risk for remote workers
Planning: Document residency clearly; avoid "convenience of employer" rules in NY/PA
Multi-state S-Corp shareholder
Different state tax treatment for owners in different states
2026 Value: Complex compliance
Planning: Composite returns + non-resident withholding; consult multi-state CPA
Reasonable salary in different states
IRS uses national averages; state norms may differ
2026 Value: Audit defense
Planning: Document with state-specific BLS data + industry surveys
Step-up basis on entity dissolution
Basis adjustment varies by state; ESOP options
2026 Value: Estate planning
Planning: Combine entity choice with estate planning; consult tax + estate attorney
8 Common Mistakes
S-Corp election with too-low net income — 30% frequency
Impact: Admin cost > tax savings; net loss
Mitigation: Wait until net income $75K+ before S-Corp election; can revoke and refile
Unreasonably low salary on S-Corp — 25% frequency
Impact: IRS audit + back FICA + 25% accuracy penalty
Mitigation: Use industry standard 40-60% of net income; document with BLS data + comparables
Missing S-Corp election deadline — 20% frequency
Impact: Lose election year; reset to default tax
Mitigation: File Form 2553 within 75 days of entity formation OR by March 15 for current year retroactive
Confusing LLC with S-Corp — 40% frequency
Impact: Wrong tax treatment; missing election
Mitigation: LLC = entity type; S-Corp = tax election for LLC or Corp
Forgetting Section 199A on QBI calculation — 50% frequency
Impact: Up to $50K missed deduction
Mitigation: Use CPA software (Drake, ProSeries, Lacerte); manual calculation error-prone
No payroll setup for S-Corp — 15% frequency
Impact: IRS penalty + back payroll taxes
Mitigation: Use Gusto, ADP, Paychex; mandatory W-2 to owner; quarterly Form 941 + annual W-2/W-3
Mixing personal + business expenses — 60% frequency
Impact: Audit risk + tax disallowance
Mitigation: Separate business bank account + credit card; document business purpose
Choosing C-Corp without VC strategy — 15% frequency
Impact: Double taxation; complexity
Mitigation: C-Corp only for VC-backed or high-growth; LLC + S-Corp covers most cases
FAQ
When does S-Corp save money over LLC or sole proprietorship?
Net income $75K+ is typical break-even. S-Corp savings come from Self-Employment (SE) tax reduction: a sole prop pays 15.3% SE tax on ALL profit; an S-Corp pays 15.3% only on the W-2 salary portion. Example net $200K: Sole prop pays $30K SE tax ($200K × 15.3%); S-Corp with $100K reasonable salary pays $15.3K SE on salary + $0 on $100K distribution = $14.7K savings. After $3K admin costs (payroll + bookkeeping + filing), net savings $11.7K. Below $75K net income, admin cost typically exceeds SE tax savings. Above $500K, S-Corp + multi-entity strategies become essential. Hard rule: don't make S-Corp election until net income consistently $75K+.
What is a reasonable salary for an S-Corp owner?
Industry-comparable W-2 wage for similar work, typically 40-60% of net income for most professions. IRS guidelines: must be "what a similar position would pay." Specific occupational examples: Software engineer (solo) — 50% (e.g., $100K salary on $200K net); Marketing consultant — 50-55%; Real estate agent — 50-60%; Doctor (SSTB) — 70-80% (high earnings + service-heavy); E-commerce seller — 40% (product business, less service); SaaS founder — 30% (asset-heavy); Lawyer (SSTB) — 65-75%. Always document: BLS Occupational Employment Statistics, salary surveys (Robert Half, BuiltIn), comparable transactions. Too-low salary triggers IRS audit + back FICA + 25% accuracy penalty. Too-high salary loses tax savings benefit.
What is the Section 199A QBI deduction?
Up to 20% of qualified business income deduction for pass-through entities. Section 199A (IRC) allows owners of LLC/S-Corp/sole prop to deduct 20% of "Qualified Business Income" (QBI) from their personal taxes. Phase-out thresholds 2026: $197,300 single / $394,600 MFJ. Above threshold + Specified Service Trade or Business (SSTB — doctor, lawyer, accountant, financial advisor, athlete, performer): NO deduction allowed. Above threshold + non-SSTB: subject to W-2 wages + property limitations. Below threshold: full 20% deduction. Example $150K LLC owner non-SSTB: $30K deduction reduces taxable income by $30K = ~$7K-$10K tax savings. Critical to track for planning; missing it costs $5K-$50K annually.
Should I keep my LLC or elect S-Corp status?
Elect S-Corp when net income consistently $75K+ AND you can handle payroll administration. LLC default = Schedule C taxation = full SE tax on profit. S-Corp election (via Form 2553 within 75 days of formation OR by March 15 for current year) = profits split into salary + distribution. Salary subject to FICA/Medicare; distribution NOT subject to SE tax. Saves 15.3% × distribution. Costs: payroll software ($20-$80/month), bookkeeping ($150-$500/month), separate tax return filing ($500-$1,500/year), additional filing fees. Break-even ~$75K net income; clear winner $100K+. LLC default better for: unpredictable income, side hustle, low net income, sub-$60K projections. S-Corp better for: stable $100K+, professional services, ability to manage payroll.
How does S-Corp work for multi-member partners?
S-Corp election applies entity-wide; all owners get pro-rata salary + distribution. Multi-member LLC default = partnership (Form 1065 + K-1). With S-Corp election: each owner becomes shareholder; entity issues W-2 (salary) + Schedule K-1 (distribution) to each. Salary should be reasonable for each owner's contribution. Tax savings split proportionally to ownership. Limitations: maximum 100 shareholders, US persons only, single class of stock. Common pattern: 2-5 person professional services firm — each partner takes salary + receives distribution. Preserves SE tax savings for ALL owners. CON: more complex than LLC partnership; payroll for each owner; quarterly Form 941. PRO: each owner saves $5K-$20K+ annually in SE tax.
When should I form a C-Corporation?
Three scenarios. (1) VC-backed / planning to raise venture capital — investors require C-Corp; QSBS Section 1202 founder benefit is C-Corp specific. (2) Multi-owner growth-stage company — C-Corp simpler with 100+ shareholders; no S-Corp ownership restrictions. (3) International / foreign owners — S-Corp restricts foreign ownership; C-Corp more flexible. Cons: double taxation (corporate 21% + dividend 15-23.8%); complex tax filing; ongoing $4K+/year admin. Most solo + small business stays LLC + S-Corp election. Consider C-Corp only with specific reason (VC, founder QSBS goal, international structure). Common mistake: forming C-Corp without VC plan = unnecessary complexity + higher tax burden.
Can I switch entity types as my business grows?
Yes — strategic switching is common. Typical progression: (1) Sole prop or SMLLC at startup ($0-$50K); (2) S-Corp election at $75K-$100K stable income; (3) Multi-entity strategy at $500K+; (4) C-Corp at VC raise. Switching costs: file Form 8832 to change entity classification; new EIN may be required; possible gain recognition. Best switching points: end of tax year (December 31), or formation anniversary. S-Corp election (Form 2553): file by March 15 for current year retroactive; or any time effective next year. Reverting from S-Corp to LLC default requires 5-year wait minimum. Plan switching with CPA — improper switching can trigger entity-level taxation events.
What records do I need for S-Corp tax filing?
Comprehensive bookkeeping required. Mandatory records: (1) Quarterly Form 941 (payroll tax); (2) Annual W-2 for owner + W-3 transmittal; (3) Annual Form 1120-S corporate return; (4) Schedule K-1 to each shareholder; (5) Owner's Schedule E + 1040 personal return; (6) Annual unemployment tax (Form 940); (7) State payroll filings; (8) Bookkeeping (QuickBooks, Xero, etc.); (9) Reasonable salary documentation; (10) Distribution documentation. Tools: Gusto/ADP for payroll ($30-$80/month); QuickBooks/Xero for bookkeeping ($30-$60/month); CPA for S-Corp tax filing ($800-$2,000/year). Total annual S-Corp admin: $2,500-$5,000 — included in break-even calculation. Without good records, S-Corp tax savings can be wiped out by penalties or improper salary determination.
Related Tax Resources
- RSU + ISO + NSO Tax Strategy
- Self-Employment Tax Calculator
- State Tax Migration Calculator
- 15 Tax Refund Strategies
- Quarterly Tax Calculator
Data sources: IRC Section 199A (Qualified Business Income), Section 1361-1379 (S-Corporations), Section 706 (Partnership Tax), IRS Form 2553 (S-Corp Election), Form 1120-S (S-Corp Return), Form 941 (Quarterly Payroll), Rev. Rul. 74-44 (reasonable compensation), BLS OEWS for occupational salary benchmarks. Updated 2026-04-26. Entity choice is complex with state-by-state variations; consult tax attorney + CPA for specific situation.