Foundation
2026 Tax Parameters Used in This Guide
Every calculation in this guide uses the following projected 2026 federal tax parameters. These reflect enacted legislation (the QBI deduction is now permanent) and IRS inflation adjustments:
| Parameter | 2026 Value | Source |
|---|---|---|
| Social Security Wage Base | $184,500 | IRS Rev. Proc. (projected) |
| SE Tax Rate | 15.3% (12.4% SS + 2.9% Medicare) | IRC §1401 |
| SE Income Factor | 92.35% of net SE income | IRC §1402(a) |
| Additional Medicare Tax | 0.9% over $200K (single) / $250K (MFJ) | IRC §3101(b)(2) |
| QBI Deduction (§199A) | 23% — permanent (OBBBA) | IRC §199A, OBBBA |
| QBI Income Threshold | ~$197,300 (single) / ~$394,600 (MFJ) | IRS inflation adjustment |
| Standard Deduction (Single) | $15,000 | IRS Rev. Proc. 2025-61 |
| Standard Deduction (MFJ) | $30,000 | IRS inflation adjustment |
| C-Corp Tax Rate | 21% flat | IRC §11(b) |
| Qualified Dividends Rate | 0% / 15% / 20% | IRC §1(h) |
| Bonus Depreciation | 100% (restored) | IRC §168(k) |
| SALT Deduction Cap | $40,000 | IRC §164(b)(6) |
Entity Overview
Understanding the Three Entity Structures
Sole Proprietorship / Single-Member LLC (Default)
A single-member LLC is a "disregarded entity" for federal tax purposes — the IRS treats it identically to a sole proprietorship. All net business income flows to your personal Form 1040 via Schedule C, and you pay self-employment tax on the full amount (15.3% on 92.35% of net income).
- Tax filing: Schedule C (Form 1040) + Schedule SE
- SE tax: 15.3% on all net business income (up to SS wage base), plus 2.9% Medicare on amounts above
- QBI deduction: Eligible for 23% deduction on qualified business income (OBBBA permanent)
- Compliance cost: Minimal — no separate business return required
- Liability protection: LLC provides asset protection; sole prop does not
S-Corporation (Tax Election)
An S-Corp is not a separate entity type — it's a federal tax election made by an LLC or corporation. The key benefit: S-Corp owners split income into salary (subject to FICA/payroll taxes) and distributions (not subject to FICA). This can produce significant tax savings at higher income levels.
- Tax filing: Form 1120-S (corporate return) + Schedule K-1 → personal Form 1040
- SE tax: FICA only on W-2 salary; distributions are FICA-exempt
- QBI deduction: Eligible — applies to the pass-through income (not salary)
- Compliance cost: $1,500–$3,500/year (payroll, 1120-S, bookkeeping)
- Key requirement: Must pay "reasonable compensation" to owner-employees
- Election: File Form 2553 by March 15 of the desired tax year
C-Corporation
A C-Corp is a separate taxable entity. Profits are taxed at the corporate level (21% flat rate), and dividends distributed to shareholders are taxed again at the individual level — creating "double taxation." C-Corps make sense for specific strategies: venture funding, retained earnings, stock-based compensation, or complex ownership structures.
- Tax filing: Form 1120 (corporate return) — completely separate from personal return
- Corporate tax: 21% flat rate on all corporate income
- Dividends: Taxed at 0%/15%/20% qualified dividend rates when distributed
- QBI deduction: Not eligible (C-Corp income is not pass-through)
- Compliance cost: $2,000–$5,000+/year (corporate return, minutes, bookkeeping)
- Key benefit: Can retain earnings at 21% — lower than top individual rates
| Feature | Sole Prop / LLC | S-Corp | C-Corp |
|---|---|---|---|
| Pass-through taxation | Yes | Yes | No |
| SE tax on all income | Yes — full | Salary only | No SE tax |
| QBI deduction eligible | Yes | Yes | No |
| Double taxation | No | No | Yes |
| Payroll required | No | Yes | Yes |
| Separate tax return | No | Form 1120-S | Form 1120 |
| Ownership restrictions | None | 100 shareholders, US only | None |
| Estimated annual compliance | $0–$500 | $1,500–$3,500 | $2,000–$5,000+ |
The Core Analysis
Tax Burden Comparison: $50K to $500K
The following analysis compares the total federal tax burden for a single filer operating as a sole proprietor (LLC), S-Corp, or C-Corp at five income levels. For the S-Corp scenario, we use a salary split that reflects reasonable compensation guidelines (typically 50–60% of net income at lower levels, tapering to 35–45% at higher levels).
At $50,000 Net Business Income
Sole Proprietorship / LLC
Sole Prop Calculation — $50,000
- SE tax base: $50,000 × 92.35% = $46,175
- SE tax: $46,175 × 15.3% = $7,065
- Deductible half of SE tax: $3,532
- AGI: $50,000 − $3,532 = $46,468
- QBI deduction: $46,468 × 23% = $10,688 (limited to 23% of QBI = $50,000 × 23% = $11,500)
- Taxable income: $46,468 − $15,000 (std ded) − $10,688 (QBI) = $20,780
- Federal income tax: ~$2,438
- Total federal tax: ~$9,503 (effective rate: ~19.0%)
S-Corp (55% salary / 45% distribution)
S-Corp Calculation — $50,000 (salary: $27,500)
- W-2 salary: $27,500
- Employer FICA: $27,500 × 7.65% = $2,104 (business expense)
- Employee FICA: $27,500 × 7.65% = $2,104
- Pass-through income: $50,000 − $27,500 − $2,104 = $20,396
- Total personal income: $27,500 + $20,396 = $47,896
- QBI deduction (on pass-through): $20,396 × 23% = $4,691
- Taxable income: $47,896 − $15,000 − $4,691 = $28,205
- Federal income tax: ~$3,178
- Total FICA (employer + employee): $4,208
- Total federal tax: ~$7,386
- Compliance costs: ~$2,000/year
- Net cost after compliance: ~$9,386 (effective: ~18.8%)
At $100,000 Net Business Income
Sole Prop — $100,000
- SE tax base: $100,000 × 92.35% = $92,350
- SE tax: $92,350 × 15.3% = $14,130
- Deductible half: $7,065
- AGI: $92,935
- QBI deduction: ~$18,587
- Taxable income: $92,935 − $15,000 − $18,587 = $58,648
- Federal income tax: ~$8,352
- Total: ~$22,482 (effective: ~22.5%)
S-Corp — $100,000 (salary: $50,000)
- W-2 salary: $50,000
- Employer FICA: $50,000 × 7.65% = $3,825
- Employee FICA: $3,825
- Pass-through: $100,000 − $50,000 − $3,825 = $46,175
- Total personal income: $96,175
- QBI deduction (on pass-through): $46,175 × 23% = $10,620
- Taxable income: $96,175 − $15,000 − $10,620 = $70,555
- Federal income tax: ~$10,931
- Total FICA: $7,650
- Total: ~$18,581
- Compliance: ~$2,500
- Net cost: ~$21,081 (effective: ~21.1%)
Run your exact numbers → Input your net income, filing status, and state to see a personalized comparison.
Open Entity CalculatorAt $150,000 Net Business Income
Sole Prop — $150,000
- SE tax base: $150,000 × 92.35% = $138,525
- SE tax: $138,525 × 15.3% = $21,194
- Deductible half: $10,597
- AGI: $139,403
- QBI deduction: ~$27,881
- Taxable income: $139,403 − $15,000 − $27,881 = $95,822
- Federal income tax: ~$15,566
- Total: ~$36,760 (effective: ~24.5%)
S-Corp — $150,000 (salary: $65,000)
- W-2 salary: $65,000
- Employer FICA: $65,000 × 7.65% = $4,973
- Employee FICA: $4,973
- Pass-through: $150,000 − $65,000 − $4,973 = $80,027
- Total personal income: $145,027
- QBI deduction (on pass-through): $80,027 × 23% = $18,406
- Taxable income: $145,027 − $15,000 − $18,406 = $111,621
- Federal income tax: ~$19,622
- Total FICA: $9,946
- Total: ~$29,568
- Compliance: ~$2,500
- Net cost: ~$32,068 (effective: ~21.4%)
At $250,000 Net Business Income
Sole Prop — $250,000
- SE tax base: $250,000 × 92.35% = $230,875
- SS portion: $184,500 × 12.4% = $22,878
- Medicare: $230,875 × 2.9% = $6,695
- Additional Medicare (over $200K): $30,875 × 0.9% = $278
- Total SE tax: $29,851
- Deductible half: $14,926
- AGI: $235,074
- QBI deduction: limited — above $197,300 threshold, phase-out applies. Estimate ~$24,000 (varies by SSTB status)
- Taxable income: ~$195,374
- Federal income tax: ~$38,816
- Total: ~$68,667 (effective: ~27.5%)
S-Corp — $250,000 (salary: $100,000)
- W-2 salary: $100,000
- Employer FICA: $100,000 × 7.65% = $7,650
- Employee FICA: $7,650
- Pass-through: $250,000 − $100,000 − $7,650 = $142,350
- Total personal income: $242,350
- QBI deduction (on pass-through): up to $28,470 (subject to threshold limitations)
- Taxable income: ~$198,180
- Federal income tax: ~$39,645
- Total FICA: $15,300
- Total: ~$54,945
- Compliance: ~$3,000
- Net cost: ~$57,945 (effective: ~23.2%)
At $500,000 Net Business Income
Sole Prop — $500,000
- SE tax base: $500,000 × 92.35% = $461,750
- SS portion: $184,500 × 12.4% = $22,878
- Medicare: $461,750 × 2.9% = $13,391
- Additional Medicare (over $200K): $261,750 × 0.9% = $2,356
- Total SE tax: $38,625
- Deductible half: $19,312
- AGI: $480,688
- QBI deduction: likely $0–$10,000 (above threshold; SSTB fully phased out, non-SSTB limited by W-2 wages/property)
- Taxable income: ~$460,000
- Federal income tax: ~$114,700
- Total: ~$153,325 (effective: ~30.7%)
S-Corp — $500,000 (salary: $175,000)
- W-2 salary: $175,000
- Employer FICA: SS ($175,000 capped at $184,500) + Medicare = $13,388 + $5,075 = $16,099 (approx, using $175K × 7.65% = $13,388)
- Employee FICA: $13,388
- Pass-through: $500,000 − $175,000 − $13,388 = $311,612
- Total personal income: $486,612
- QBI deduction: limited by W-2 wages — 50% of W-2 wages = $87,500, or 23% of QBI = $71,671 — lesser applies: ~$71,671
- Taxable income: ~$408,590
- Federal income tax: ~$97,300
- Total FICA: $26,776
- Additional Medicare on salary over $200K: $0 (salary under $200K)
- Total: ~$124,076
- Compliance: ~$3,500
- Net cost: ~$127,576 (effective: ~25.5%)
C-Corp Analysis: When Double Taxation Makes Sense
The C-Corp introduces double taxation — profits taxed at 21% corporate rate, then dividends taxed at 0%/15%/20% to shareholders. However, there are scenarios where this structure produces a lower total tax burden:
C-Corp Scenario — $250,000 Business Income (Full Distribution)
- Owner salary: $100,000 (deductible to the corp)
- Corporate taxable income: $250,000 − $100,000 = $150,000
- Corporate tax: $150,000 × 21% = $31,500
- After-tax profit: $118,500
- Qualified dividend tax (15% rate): $118,500 × 15% = $17,775
- Owner's personal income tax on salary: ~$14,768
- FICA on salary: $15,300
- Total combined tax: ~$79,343 (effective: ~31.7%)
Compared to S-Corp total of ~$57,945 — the C-Corp costs ~$21,400 more when all profits are distributed.
C-Corp Scenario — $250,000 Business Income (Retained Earnings)
- Owner salary: $100,000
- Corporate taxable income: $150,000
- Corporate tax: $31,500
- Retained in business: $118,500 — no dividend tax until distributed
- Owner's personal tax on salary + FICA: ~$30,068
- Current-year total: ~$61,568 (effective: ~24.6%)
When retaining earnings for business growth, the C-Corp's current-year burden can be comparable to or lower than the S-Corp — the trade-off is deferred double taxation when profits are eventually distributed.
Summary
Complete Tax Burden Summary
The following table summarizes the total federal tax burden (including SE/FICA taxes) across all income levels and entity types, after accounting for typical compliance costs:
| Net Income | Sole Prop / LLC | S-Corp (Net) | S-Corp Savings | C-Corp (All Distributed) |
|---|---|---|---|---|
| $50,000 | ~$9,503 (19.0%) | ~$9,386 (18.8%) | ~$117 | ~$12,200 (24.4%) |
| $100,000 | ~$22,482 (22.5%) | ~$21,081 (21.1%) | ~$1,400 | ~$27,800 (27.8%) |
| $150,000 | ~$36,760 (24.5%) | ~$32,068 (21.4%) | ~$4,700 | ~$43,500 (29.0%) |
| $250,000 | ~$68,667 (27.5%) | ~$57,945 (23.2%) | ~$10,700 | ~$79,343 (31.7%) |
| $500,000 | ~$153,325 (30.7%) | ~$127,576 (25.5%) | ~$25,750 | ~$164,000 (32.8%) |
See your exact S-Corp savings → Get a personalized analysis with your income, salary split, and state taxes.
Open Entity CalculatorSalary Split Strategy
Reasonable Compensation: How to Set Your S-Corp Salary
The IRS requires S-Corp owner-employees to pay themselves "reasonable compensation" before taking distributions. Set the salary too low and you risk reclassification (back taxes + penalties). Set it too high and you lose the SE tax benefit. Here's how to find the sweet spot:
Factors the IRS Considers
- Services rendered: What duties do you perform? More specialized roles justify higher salaries.
- Comparable salaries: What do similar positions pay in your industry and geographic area?
- Business revenue and profits: Your salary should be proportional to business performance.
- Time and effort: Full-time operators should earn more than part-time owners.
- Experience and qualifications: Credentials and years of experience factor in.
Salary Split Guidelines by Income Level
| Net Income | Suggested Salary Range | % of Net Income | Rationale |
|---|---|---|---|
| $50,000–$75,000 | $27,000–$45,000 | 55–60% | At lower incomes, salary must represent most of the income — leaving too much as distributions raises red flags |
| $75,000–$150,000 | $45,000–$75,000 | 50–55% | Standard range for most solopreneurs and consultants |
| $150,000–$250,000 | $65,000–$110,000 | 40–50% | Higher profits allow more distribution allocation; salary should match industry norms |
| $250,000–$500,000 | $100,000–$185,000 | 35–45% | Significant profit allows larger distribution share; consider capping at SS wage base for max savings |
| $500,000+ | $150,000–$250,000 | 30–40% | At this level, the salary reflects what a hired executive would earn — not a percentage of profits |
Decision Framework
Which Entity Is Right for You?
Stay as Sole Prop / LLC When:
- Net business income is consistently below $60,000
- Your income fluctuates significantly year to year
- You want minimum administrative complexity
- You're testing a business idea and may pivot or shut down
- You have significant business losses to offset other income
Elect S-Corp When:
- Net business income consistently exceeds $80,000
- You can establish a defensible reasonable compensation figure
- You're comfortable with payroll obligations and quarterly filings
- You're a U.S. citizen or resident with no plans to add foreign investors
- You want to maximize current-year tax savings on self-employment income
Choose C-Corp When:
- You plan to raise venture capital or angel investment
- You want to offer stock options or ISOs to employees
- You plan to retain significant earnings in the business (21% rate)
- You have or plan to have international shareholders
- You're building toward an IPO or acquisition exit
S-Corp Election
How to Elect S-Corp Status: Form 2553 Guide
Converting to S-Corp taxation requires filing Form 2553 (Election by a Small Business Corporation) with the IRS. Here's the step-by-step process:
Filing Deadlines
- New entity: Within 75 days of formation
- Existing entity: By March 15 of the tax year you want the election effective
- Late filing: Relief available under Rev. Proc. 2013-30 if you have "reasonable cause"
Eligibility Requirements
- Must be a domestic (U.S.) entity
- Maximum 100 shareholders (family members can count as one)
- Only individuals, estates, and certain trusts can be shareholders (no partnerships, corporations, or non-resident aliens)
- Only one class of stock (though voting/non-voting rights can differ)
- Cannot be an ineligible corporation (certain financial institutions, insurance companies, or DISCs)
Steps to File
- Verify eligibility — confirm your entity meets all S-Corp requirements
- Get all shareholders to consent — each shareholder must sign Form 2553
- Complete Form 2553 — entity name, EIN, tax year, shareholder details
- Submit to the IRS — mail to the IRS Service Center for your state, or fax to (855) 887-7734
- Wait for confirmation — the IRS sends CP261 acceptance letter (usually 60 days)
- Set up payroll — establish payroll processing before your first pay period
Generate your Form 2553 → Our S-Corp Election Generator pre-fills the form with your entity details.
S-Corp Election GeneratorCommon Mistakes
Top Mistakes to Avoid
1. Electing S-Corp Too Early
If your net income is under $60K, the $1,500–$3,500 in annual compliance costs may eat your entire SE tax savings. Wait until your income is consistently above $80K before making the election.
2. Setting Salary Too Low
The IRS actively audits S-Corps paying owner salaries below industry norms. A marketing consultant earning $300K who pays herself $30K in salary is inviting an audit. Use BLS data and salary surveys to defend your compensation level.
3. Ignoring State-Level Taxes
Some states impose franchise taxes, minimum taxes, or entity-level taxes on S-Corps that don't apply to sole proprietors. California charges a minimum $800/year franchise tax plus 1.5% on net income. New York City imposes the Unincorporated Business Tax on sole props but not S-Corps. Always model your state taxes before electing.
4. Forgetting About QBI Phase-outs
At higher incomes, the QBI deduction phases out. For Specified Service Trades or Businesses (SSTBs — lawyers, accountants, consultants, doctors), the deduction disappears entirely between $197,300–$247,300 (single). Non-SSTBs face the W-2 wage/property limitation instead. Model this carefully before choosing your entity.
5. Missing the March 15 Deadline
Form 2553 must be filed by March 15 to be effective for the current tax year. Miss it and you wait until next year — or hope for late-election relief under Rev. Proc. 2013-30. Set a calendar reminder for January to evaluate the election each year.
FAQ
Frequently Asked Questions
When should I elect S-Corp status?
Most tax professionals recommend considering S-Corp election when net self-employment income consistently exceeds $60,000–$80,000 annually. Below that threshold, the compliance costs ($1,500–$3,000/year for payroll, S-Corp tax return, and bookkeeping) often exceed the SE tax savings. File Form 2553 with the IRS by March 15 of the tax year you want the election to take effect.
What is the reasonable compensation requirement for S-Corp owners?
S-Corp owner-employees must pay themselves a reasonable salary before taking distributions. The IRS determines reasonable compensation based on the services you provide, comparable salaries in your industry, and your experience level. A common guideline is 50–60% of net business income as salary, but this varies. Paying too little salary risks IRS reclassification of distributions as wages, triggering back taxes, penalties, and interest.
How does the QBI deduction work for each entity type?
The Section 199A Qualified Business Income (QBI) deduction allows a 23% deduction on qualified business income from pass-through entities (sole proprietorships, partnerships, S-Corps). The rate was raised from 20% to 23% permanently under the One Big Beautiful Bill Act (OBBBA). C-Corps do not qualify. Below the income threshold (~$197,300 single / ~$394,600 MFJ), the full 23% applies. Above the threshold, limitations based on W-2 wages paid and qualified property begin to phase in, and specified service trades or businesses (SSTBs) face additional restrictions.
What are the 2026 self-employment tax rates?
For 2026, the SE tax rate is 15.3% (12.4% Social Security + 2.9% Medicare) on 92.35% of net self-employment income. The Social Security wage base is $184,500. An additional 0.9% Medicare surtax applies to earnings above $200,000 (single) or $250,000 (MFJ). Half of SE tax is deductible as an above-the-line deduction on your Form 1040.
Can I convert my LLC to an S-Corp?
Yes. An LLC can elect S-Corp tax treatment by filing Form 2553 with the IRS. The LLC remains an LLC under state law but is taxed as an S-Corp for federal purposes. This must be filed by March 15 of the tax year you want the election effective, or within 75 days of forming the LLC. Late elections may qualify for relief under Revenue Procedure 2013-30.
What is the difference between an LLC and an S-Corp?
An LLC is a state-level legal entity that provides liability protection. By default, a single-member LLC is taxed as a sole proprietorship. An S-Corp is a federal tax election (not a separate entity type) that changes how the business is taxed. An LLC can elect S-Corp taxation. The key difference: S-Corp owners split income into salary (subject to FICA) and distributions (not subject to FICA), potentially saving thousands in self-employment taxes at higher income levels.
When does a C-Corp make sense for a small business?
A C-Corp makes sense when: (1) you plan to raise venture capital or go public, (2) you want to retain significant earnings in the business at the flat 21% corporate rate, (3) you have foreign shareholders or complex ownership structures, or (4) you want to offer equity compensation (stock options, ISOs). The downside is double taxation — profits are taxed at the corporate level and again when distributed as dividends to shareholders.
How much does S-Corp compliance cost?
Typical annual S-Corp compliance costs include: payroll processing ($500–$1,200/year), S-Corp tax return preparation via Form 1120-S ($800–$2,000), additional bookkeeping requirements ($500–$1,500/year), and state-level franchise taxes or fees ($0–$800 depending on the state). Total annual compliance overhead typically runs $1,500–$3,500, which must be weighed against the SE tax savings.
Sources & IRS References
- IRS Publication 334 — Tax Guide for Small Business (2025 edition): irs.gov/publications/p334
- IRS Form 2553 — Election by a Small Business Corporation: irs.gov/forms-pubs/about-form-2553
- IRC §199A — Qualified Business Income Deduction: law.cornell.edu/uscode/text/26/199A
- IRC §1401 — Self-Employment Tax Rates: law.cornell.edu/uscode/text/26/1401
- IRC §1402(a) — Net Earnings from Self-Employment (92.35% factor): law.cornell.edu/uscode/text/26/1402
- IRC §11(b) — Corporate Tax Rate (21%): law.cornell.edu/uscode/text/26/11
- IRC §168(k) — Bonus Depreciation: law.cornell.edu/uscode/text/26/168
- Watson v. Commissioner, T.C. Memo 2012-168 (reasonable compensation case): ustaxcourt.gov
- Revenue Procedure 2013-30 (late S-Corp election relief): irs.gov/irb/2013-36_IRB
- BLS Occupational Employment and Wage Statistics: bls.gov/oes
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