S-Corp vs LLC Tax Comparison Calculator

How to Use This Tool

Follow these steps to generate an accurate tax comparison between S-Corp and LLC structures:

1. Enter your annual business net income: this is your total revenue minus ordinary business expenses, before any owner compensation or salary.
2. Input a reasonable S-Corp salary: the IRS requires S-Corp owners to pay themselves a fair market salary for their role, which is subject to FICA taxes.
3. Select your tax filing status: choose Single, Married Filing Jointly, or Head of Household to align with your personal tax return.
4. Enter your effective federal income tax rate: this is the percentage of pass-through income you pay in federal income tax (you can use your prior year rate as an estimate).
5. Add your state income tax rate: enter 0 if your state does not impose personal income tax.
6. Click the Calculate Tax Comparison button to view detailed breakdowns for both entity types.
7. Use the Reset Form button to clear all inputs and start a new calculation.

Formula and Logic

This calculator uses simplified tax rules to estimate liabilities for both structures. All calculations assume pass-through taxation, where business income is taxed on the owner’s personal return.

LLC Tax Calculation

• Self-Employment Tax: Net Income × 15.3% (covers Social Security and Medicare taxes for all business income)
• Federal Income Tax: Net Income × Effective Federal Tax Rate
• State Income Tax: Net Income × State Tax Rate
• Total LLC Tax: Self-Employment Tax + Federal Income Tax + State Income Tax

S-Corp Tax Calculation

• Salary FICA Tax: Reasonable Salary × 15.3% (FICA only applies to salary, not distributions)
• Distributions: Net Income − Reasonable Salary (not subject to FICA)
• Federal Income Tax: Net Income × Effective Federal Tax Rate (applies to all pass-through income)
• State Income Tax: Net Income × State Tax Rate
• Total S-Corp Tax: Salary FICA Tax + Federal Income Tax + State Income Tax

Note: This tool uses a flat 15.3% FICA rate and does not account for the Social Security wage base, additional Medicare taxes, or deductions. For precise calculations, consult a tax professional.

Practical Notes

Keep these finance-specific considerations in mind when interpreting your results:

• Reasonable salary requirements: The IRS scrutinizes S-Corp salaries to ensure they align with industry standards for your role. Underpaying salary to reduce FICA taxes can trigger penalties.
• FICA tax limits: For 2024, Social Security tax only applies to the first $168,600 of salary. This calculator uses a flat 15.3% rate for simplicity, which may overstate taxes for high earners.
• Additional Medicare tax: Earners with income above $200,000 (Single) or $250,000 (Married Filing Jointly) pay an additional 0.9% Medicare tax, which is not included here.
• State tax differences: Some states treat S-Corps and LLCs differently, including franchise taxes or gross receipts taxes not accounted for in this tool.
• Deductions: This calculator does not factor in qualified business income (QBI) deductions, which can reduce taxable income for both structures by up to 20%.

Why This Tool Is Useful

Choosing between an S-Corp and LLC has long-term financial implications for small business owners, freelancers, and independent contractors:

• Quantifies FICA savings: S-Corps can reduce self-employment tax liabilities by splitting income into salary and distributions, a benefit this tool clearly illustrates.
• Supports entity selection: Compare real dollar differences to decide which structure aligns with your income level and growth plans.
• Saves professional fees: Get a preliminary estimate before paying for a CPA consultation to structure your business.
• Flexible inputs: Adjust tax rates and salary assumptions to model different scenarios, such as income growth or tax law changes.

Frequently Asked Questions

Is an S-Corp always better for tax savings than an LLC?

No. S-Corps only provide tax savings if the FICA savings on distributions exceed the additional administrative costs of maintaining an S-Corp, such as payroll fees, separate tax filings, and reasonable salary requirements. For low-income businesses, the LLC structure is often simpler and more cost-effective.

What counts as a reasonable S-Corp salary?

The IRS defines reasonable salary as what a similar business would pay for the same services. Factors include your experience, industry standards, time spent working for the business, and dividends paid. Use sites like Glassdoor or Bureau of Labor Statistics data to benchmark your salary.

Does this calculator include state franchise taxes?

No. This tool only accounts for personal income tax and FICA/self-employment tax. Many states impose additional franchise taxes or annual report fees on S-Corps and LLCs, which vary by state and business income. Check your state’s tax agency for specific rates.

Additional Guidance

While this tool provides a useful estimate, it is not a substitute for professional tax advice:

• Consult a CPA: Tax laws change frequently, and a certified public accountant can adjust calculations for your specific deductions, credits, and state requirements.
• Review IRS guidelines: Refer to IRS Publication 542 (Corporations) and Publication 505 (Tax Withholding) for official rules on S-Corp salary requirements and estimated tax payments.
• Model multiple scenarios: Run calculations with different salary and income assumptions to see how changes in your business affect tax liabilities over time.
• Consider non-tax factors: S-Corps have stricter record-keeping requirements, while LLCs offer more flexibility in profit distribution. Factor these operational differences into your decision.