There is no universal profit threshold at which an S-corporation election becomes financially beneficial for business owners. The outcome depends on the business’s sustainable profit, the owner’s reasonable W-2 compensation, the qualified business income deduction, employer payroll taxes, payroll-administration costs, tax preparation fees and the resulting federal income tax.
As a result, the potential benefit cannot be determined from self-employment tax savings alone. Focusing on that factor without considering QBI and the additional cost of operating an S corporation can materially overstate the potential savings.
Using 2026 federal tax rules and a New York business-owner fact pattern, this S-Corp vs. LLC case study compares an S-corporation election with a single-member LLC’s default sole-proprietor tax treatment for a New York consulting business owner filing as a single taxpayer. The analysis examines annual profit levels of $100,000, $150,000, $200,000 and $300,000 and illustrates when an S-corporation election may produce a net cost, approach the break-even point or generate more meaningful savings.
For an explanation of the underlying tax rules, reasonable compensation requirements and New York compliance considerations, read our article S-Corp vs. LLC: 2026 Tax Comparison for New York Small-Business Owners.
Table of Contents
1.0 Practical Case Study
Consider a single New York State resident (operating outside New York City) who owns an active consulting company (classified as a Specified Service Trade or Business, or SSTB). The owner is evaluating whether to retain the single-member LLC’s default sole-proprietor tax treatment or elect to have the LLC taxed as an S corporation. Business owners who are still deciding among sole proprietorship, LLC, partnership and corporate structures can review our guide to choosing the appropriate business entity structure.
The case study uses four profit scenarios to demonstrate how the answer changes as the business grows.
2.0 Case Study Assumptions
The case study analysis considers federal income tax, the Section 199A QBI deduction, self-employment tax, employer and employee payroll taxes, payroll administration, and S-corporation return preparation.
Table 1: Baseline Assumptions for Each Scenario
| Attribute | Baseline Parameter (Tax Year 2026) |
| Filing Status | Single filer, under age 65, no dependents. |
| Geography | Full-year New York State resident (operating outside NYC). |
| Business Type | Consulting firm classified as a Specified Service Trade or Business (SSTB). |
| Outside Income | $0 (The business is the owner’s sole source of income). |
| Employees | No non-owner employees; under S-corporation treatment, the owner is the only shareholder-employee. |
| S-Corp Overhead Costs | Illustrative $660/year payroll admin allowance for one owner-employee + $2,000/year S-corporation return preparation cost, based on Baccus Consulting’s published starting price for a business return. |
Note: This case study excludes New York State personal income tax, retirement contributions, health-insurance deductions, itemized deductions, tax credits, PTET, workers’ compensation, disability insurance, unemployment insurance, New York entity-level taxes and filing fees, and New York City business taxes. These items may affect the actual benefit and should be evaluated separately.
Table 2: Other Federal Inputs
| Attribute | Baseline Parameter (Tax Year 2026) |
| Social Security Tax | 12.4% combined, limited to the $184,500 wage base |
| Medicare Tax | 2.9% combined, with no wage ceiling |
| Additional Medicare Tax | 0.9% above the applicable individual threshold; the single-filer threshold used here is $200,000. |
| Standard Deduction | $16,100 (2026 federal threshold). |
| Section 199A Phase-Out | Section 199A threshold and phaseout range for this single filer: $201,750 to $276,750. |
Source: IRS 2026 Employer’s Tax Guide
3.0 Case Study Results
Table 3: Summary of the Case Study Results
| Profit Before Owner Compensation | Illustrative S-Corp Salary | Total LLC Federal Tax and Compliance Cost | Total S-Corp Federal Tax and Compliance Cost | Net S-Corp Benefit |
| $100,000 | $75,000 | $22,364.55 | $24,727.04 | ($2,362.49) loss |
| $150,000 | $90,000 | $37,607.62 | $36,451.36 | $1,156.26 savings |
| $200,000 | $110,000 | $53,430.61 | $49,777.60 | $3,653.01 savings |
| $300,000 | $130,000 | $94,086.17 | $85,471.15 | $8,615.02 savings |
Note: A negative benefit implies that the S corporation costs more than the LLC’s default tax treatment.
4.0 Supporting Computation for the Case Study
Scenario 1: $100,000 of Profit – The S Corporation Costs More
The consulting company earns $100,000 before owner compensation. If the LLC elects S-corporation status, it pays the owner a reasonable salary of $75,000.
Table 4: LLC Taxed as a Sole Proprietorship
| Parameters | Explanations |
| Self-Employment Tax | Net earnings subject to SE tax are $92,350 ($100,000 × 92.35%). At 15.3%, this equals $14,129.55. |
| QBI Deduction | QBI equals $92,935.23, calculated as $100,000 of business profit minus the $7,064.78 deductible portion of self-employment tax. Twenty percent of QBI is $18,587.05. Taxable income before the QBI deduction is $76,835.23, and 20% of that amount is $15,367.05. Because the deduction is limited to the lower amount, the allowable QBI deduction is $15,367.05. |
| Federal Income Tax | Net taxable income of $61,468.18 produces an income tax of $8,235.00. |
| Total federal tax and compliance costs | Federal income tax ($8,235) + Self-employment tax ($14,129.55) = $22,364.55 |
QBI Deduction Note: In this scenario, the QBI deduction is the lesser of 20% of qualified business income after the deductible portion of self-employment tax and 20% of taxable income before the QBI deduction. The taxable-income limitation depends on filing status, other income, deductions and net capital gain. A different personal tax profile may produce a different result.
Table 5: LLC Taxed as an S Corporation
| Parameters | Explanations |
| Payroll Taxes | A $75,000 salary triggers $11,475.00 in combined employee and employer payroll taxes. |
| Administrative Overhead | $660.00 in payroll compliance and $2,000.00 for Form 1120-S preparation equals $2,660. |
| Pass-through Income | Profit before compensation ($100,000) net of owner’s salary ($75,000), employer payroll tax ($5,737.50) and administrative overhead ($2,660) produces pass-through income of $16,602.50. |
| QBI Deduction | W-2 wages are excluded from QBI. Only the remaining $16,602.50 of pass-through income is eligible, shrinking the QBI deduction to $3,320.50. |
| Federal Income Tax | The owner reports $75,000 W-2 compensation and $16,602.50 pass-through income. After the standard deduction and QBI deduction, federal taxable income is $72,182, producing federal income tax of $10,592.04. |
| Total federal tax and compliance costs | Federal income tax ($10,592.04) + Payroll tax ($11,475.00) + Administrative overhead ($2,660) =$24,727.04 |
Based on the explanation above, the net S-Corp Benefit is $22,364.55 − $24,727.04 = ($2,362.49)
The S corporation costs the owner $2,362.49 more than the LLC taxed as a sole proprietorship.
Although the S corporation reduces employment taxes, the employment-tax savings are insufficient to offset the smaller QBI deduction and additional S-corporation compliance costs. At $100,000 of profit and a supportable $75,000 salary, the S-corporation election does not produce a tax benefit.
Results Explanatory Note:
- Payroll administration and tax-preparation fees reduce S-corporation pass-through income because they are assumed to be deductible business expenses. They are also included in total costs because they remain actual cash expenditures. This treatment captures both their income-tax effect and their economic cost without double-counting the expenses.
- The same general methodology applies to the remaining scenarios. At $300,000 of profit, however, both structures require an additional Section 199A calculation because taxable income before the QBI deduction falls within the 2026 SSTB phaseout range of $201,750 to $276,750 for a single filer. The summary results incorporate the phaseout.
5.0 When Does an S-Corporation Election Produce Tax Savings?
Based on this case study, the S-corporation election produces an annual benefit of $1,156.26 at the $150,000 profit level. Although the result is positive, the benefit remains modest relative to the additional payroll, recordkeeping and corporate compliance responsibilities.
Accordingly, $150,000 of profit represents the beginning of a potentially beneficial range under the stated assumptions and not necessarily the ideal profit level for making an S-corporation election.
At $200,000 of sustainable profit, the savings become more meaningful and may better justify the additional requirements. For the consulting business owner in this case study, approximately $175,000 to $200,000 represents a more practical planning range, while the benefit becomes more substantial at $300,000.
6.0 How Reasonable Compensation Can Eliminate the Benefit
The S-corporation advantage decreases as the owner’s salary increases. A higher salary:
- Increases Social Security and Medicare taxes
- Reduces pass-through income
- Reduces income potentially eligible for the QBI deduction
- Leaves less profit available for non-wage distributions
Using the case study assumptions, the approximate break-even compensation levels are:
Table 6: Approximate Break-Even Compensation
| Profit Before Owner Compensation | Approximate Break-Even Salary | Salary as a Percentage of Profit |
| $100,000 | Approximately $62,100 | 62% |
| $150,000 | Approximately $96,200 | 64% |
| $200,000 | Approximately $129,600 | 65% |
At approximately these salary levels, the S corporation and the LLC taxed as a sole proprietorship produce substantially the same result under the assumptions used.
The break-even salary amount is not a recommended salary. Reasonable compensation must be supported by the owner’s duties, qualifications, time devoted to the business, location, and comparable market compensation. An owner should not select a salary solely to create a desired tax result.
The key takeaway is that the election is generally most valuable when the business consistently earns substantially more than the reasonable market compensation required for the owner’s services.
7.0 Conclusion
Under the stated federal assumptions, the S-corporation election loses $2,362.49 at $100,000 of profit, begins to produce a modest $1,156.26 benefit at $150,000, reaches a more practical $3,653.01 benefit at $200,000, and produces an $8,615.02 benefit at $300,000.
For this consulting business owner, approximately $175,000 to $200,000 of sustainable annual profit is the more practical planning range, not a universal threshold. A different reasonable salary, filing status, business type, location, retirement strategy, or source of income can materially change the analysis.
The break-even salaries are analytical outputs, not recommended compensation. The owner must first determine a supportable market wage and then test whether sufficient pass-through profit remains to justify the election.
Is an S-Corporation Election Right for Your Business?
The appropriate tax structure depends on your business profit, reasonable compensation, QBI position, location and ongoing compliance costs.
Baccus Consulting helps business owners evaluate entity-tax elections and develop tax-planning strategies aligned with their current stage of growth.
If you are considering an S-corporation election, get in touch to schedule a consultation.
Learn more about our Tax Planning & Compliance Services and Financial Advisory Services.
This case study is illustrative and simplified and does not constitute tax, legal, payroll or investment advice. A business owner should obtain a personalized analysis before making or terminating an S-corporation election.
