S Corp Tax Savings Calculator
Compare Sole Proprietorship vs. S Corporation tax liabilities, model reasonable salaries, QBI deductions, and state corp fees using the latest 2026 rules.
Operating as a Sole Proprietor or a single-member LLC exposes your entire net business income to self-employment tax. For the 2026 tax year, this includes a 12.4% Social Security tax on earnings up to $184,500, a 2.9% Medicare tax on all earnings, and an additional 0.9% tax for high-income earners. By electing S Corporation status under IRS rules, you split your business profits into a W-2 salary and pass-through distributions. Self-employment tax (FICA) is only paid on the salary component, shielding the remaining profits. However, these savings must be balanced against S Corp administrative costs, state-level franchise taxes (like California's $800 minimum), and shifts in your Section 199A Qualified Business Income (QBI) deduction. Use this calculator to simulate your exact tax comparison and find your financial break-even point.
Estimated Annual Savings: $2,557
Operating as an S Corp is projected to lower your overall taxes. Savings are primarily driven by shielding your distributions from self-employment taxes.
Calculator Settings
$33,233
Includes $16,955 self-employment tax + $11,506 federal income tax.
$30,676
Includes $9,180 payroll tax + $2,800 overhead + $13,574 income tax.
Side-by-Side Tax Comparison
2026 Rules| Tax Metric | Sole Proprietor / LLC | S Corporation |
|---|---|---|
| Gross Business Net Income | $120,000 | $120,000 |
| W-2 Owner Salary (Paid to You) | — ($0) | $60,000 |
| Self-Employment Tax / W-2 FICA Social Security & Medicare | $16,955 | $9,180($4,590 employer + $4,590 employee) |
| Corporate Administrative Overhead | — ($0) | $2,312(Software, CPA + $312 SUTA/FUTA) |
| State S-Corp Entity Tax / Fees | — ($0) | $800 |
| Schedule K-1 Profit Pass-through business distributions | $120,000 | $52,298 |
| Section 199A QBI Deduction | $19,084 | $10,460 |
| Taxable Personal Income | $76,338 | $85,738 |
| Federal Personal Income Tax | $11,506 | $13,574 |
| Est. State Personal Income Tax | $4,771 | $4,810 |
| Total Combined Tax & Overhead | $33,233 | $30,676 |
| Estimated Take-Home Profit | $86,767 | $89,324 |
Calculations Breakdown & Explanation
Self-Employment Tax Savings: Under the Sole Proprietorship, you pay self-employment tax on 92.35% of the total profit, amounting to $16,955. Under the S Corporation election, you only pay payroll FICA taxes on your W-2 wages, totaling $9,180. This saves you $7,775 in Social Security and Medicare taxes.
The QBI Deduction Offset: Because W-2 wages are deducted from corporate net profit, your S Corp Qualified Business Income (QBI) decreases from $120,000 as a sole proprietor to $52,298. Consequently, your QBI deduction drops from $19,084 to $10,460, which increases your federal personal income tax liability by $2,068.
Overhead and Entity Fees: Maintaining the S Corp requires payroll and CPA services (set to $2,000) plus CA state taxes/franchise fees of $800.
Net Saving Equation: SE Tax Saved ($7,775) − QBI Loss ($8,625) − Admin Costs ($2,000) − State Entity Fees ($800) = Net Saving of $2,557.
How This Calculator Compares Taxes
The calculator operates on two separate tracks to project your net liability under each business structure:
Track 1: Sole Proprietorship / LLC
- Self-Employment Tax: Calculated on 92.35% of your total net business profit.
- SE Deduction: You receive an above-the-line deduction for 50% of your self-employment tax to determine AGI.
- QBI Deduction: Equal to 20% of your net income after subtracting the SE tax deduction, subject to phase-out limits.
- Income Tax: Personal progressive brackets (ranging from 10% to 37%) apply to taxable income after subtracting standard and QBI deductions.
Track 2: S Corporation Election
- FICA Payroll Taxes: Paid on your W-2 salary only. The employer and employee portions are calculated at 7.65% each (15.3% total), up to the 2026 cap.
- Corporate Expenses: Business income is reduced by your salary, employer FICA, and state unemployment taxes.
- QBI Deduction: 20% of the remaining K-1 profit (excluding salary). Limited to 50% of W-2 wages if income exceeds 2026 phase-in caps.
- Income Tax: Personal brackets apply to both your W-2 wages and K-1 pass-through distributions.
The 2026 Tax Formulas & Assumptions
To guarantee accuracy, this calculator relies on the official 2026 IRS schedules, Social Security wage limits, and standard deductions:
| Tax Component | 2026 Rate / Limit | Application Notes |
|---|---|---|
| Social Security Tax Cap | $184,500 | 12.4% total rate ceases above this payroll or SE income amount. |
| Medicare Tax Rate | 2.9% | No income limit; applies to all wage and self-employment income. |
| Additional Medicare Tax | 0.9% | Applies on wages/SE earnings above $200,000 (Single) or $250,000 (Married). |
| QBI Phase-In Limit | $201,750 (Single) / $403,500 (MFJ) | Deduction limits (W-2 wage tests) begin to phase in above these thresholds. |
| Standard Deduction | Single: $16,100 / Joint: $32,200 / HoH: $24,150 | Subtracted from Adjusted Gross Income to compute taxable income. |
Understanding "Reasonable Compensation"
Because S Corp distributions are exempt from FICA taxes, owners are incentivized to set their salary as low as possible. To prevent tax avoidance, the IRS mandates that shareholder-employees receive "reasonable compensation" for their labor.
⚠️ IRS Reasonable Salary Benchmarks
If your W-2 salary is deemed unreasonably low (for instance, allocating a $10,000 salary against $150,000 in net business profit), the IRS has the authority to reclassify your K-1 distributions as wages. This triggers retroactively due payroll taxes, penalties, and interest.
To remain compliant:
- Follow the 60/40 rule of thumb: allocate 60% of your business net profits to salary and 40% to distributions.
- Compare your proposed wage to market rates: What would you have to pay a third party to perform your daily tasks?
- Keep written records (such as salary surveys or job descriptions) that justify your compensation rate.
QBI Deduction Rules (Permanent in 2026)
Section 199A allows eligible small business owners to deduct up to 20% of their Qualified Business Income from federal tax. While scheduled to sunset, the One Big Beautiful Bill Act (OBBBA) of 2025 made this deduction permanent.
However, electing S Corp status shifts this calculation. S Corp W-2 wages paid to yourself are deducted from business net income, which reduces the K-1 profit subject to the 20% QBI deduction. Conversely, for high earners, having W-2 wages is necessary. For incomes exceeding $276,750 (Single) or $553,500 (Married), the QBI deduction is capped at 50% of the W-2 wages paid by the business. A Sole Proprietorship with no employees gets zero QBI deduction at these high brackets, whereas an S Corp with a $100,000 salary can unlock up to a $50,000 QBI deduction.
Who Should Use This Calculator?
You should evaluate an S Corp election if you fall into one of the following categories:
Single-Member LLC Owners
If you operate a legal LLC and are taxed as a sole proprietorship, you can keep your LLC structure but file Form 2553 to switch your tax treatment.
Independent Contractors & Freelancers
If your 1099 revenue exceeds $80,000, filing as an S Corp can protect thousands of dollars from self-employment taxes.
SaaS & Founder Structures
Manage early-stage salary drawdowns and distributions while laying the groundwork for tax-compliant founder equity vesting.
Common Mistakes to Avoid
❌ Ignoring Administrative Costs
Running an S Corp requires payroll software (like Gusto or Rippling) to pay your salary, a separate business tax return (Form 1120S), and corporate accounting records. These administrative costs typically average $1,500 to $2,500 annually. If your net savings are only $1,000, you will lose money on the election.
❌ Overlooking State-Level Taxes
Several states levy specific taxes on S Corporations. California imposes a 1.5% franchise tax on S Corp net income, with an $800 minimum due even if you run a net loss. New York and Illinois also charge receipt-based or replacement taxes on pass-through profits.
❌ Missing Filing Deadlines
To elect S Corp status, you must file Form 2553 with the IRS within 75 days of the start of the tax year, or within 75 days of incorporating. Late filings require special relief requests and can be rejected.
Frequently Asked Questions
What is the difference between an LLC and an S Corp?
An LLC (Limited Liability Company) is a legal business entity formed at the state level. An S Corp (S Corporation) is not a business entity type, but rather a tax status election that an LLC or a C Corporation can make with the IRS by filing Form 2553.
What is a 'reasonable salary' for an S Corp owner?
The IRS requires S Corp shareholder-employees to be paid a reasonable W-2 salary for the services they perform. A common guideline is the 60/40 rule (60% salary, 40% distribution), but it must also align with market rates for similar positions in your industry and geographic area.
How does the QBI deduction differ between a Sole Proprietorship and an S Corp?
For a Sole Proprietor, Qualified Business Income (QBI) is generally net profit minus the 50% self-employment tax deduction. For an S Corp, QBI is the pass-through K-1 profit, which excludes the owner's W-2 salary. However, for high earners, S Corp W-2 wages help unlock the QBI deduction because the deduction is limited to 50% of W-2 wages once taxable income exceeds the 2026 phase-in threshold ($201,750 for Single, $403,500 for Married).
When does it make sense to elect S Corp status?
Electing S Corp status typically becomes beneficial once net business income (before owner salary) reaches $70,000 to $80,000. Below this level, the administrative costs—such as running payroll software, paying additional CPA fees for corporate tax returns (Form 1120S), and state franchise fees—usually wipe out any self-employment tax savings.
Does an S Corp pay federal income taxes directly?
Generally, no. An S Corp is a pass-through entity. The corporation files an informational tax return (Form 1120S), but the net income or loss passes through to the owners on Schedule K-1. The owners then report this income on their personal tax returns and pay income taxes at their individual rates.
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Official References & Legal Guidance
Calculations are based on 2026 federal schedules and IRS revenue guidelines. Consult a CPA or tax attorney before making election decisions.