What is Structure Suitability Score?
A business structure quiz recommends sole proprietor, LLC, S-Corp, C-Corp, or partnership based on revenue, liability exposure, and tax efficiency.
The Formula
Score = (Tax Saving + Liability Protection + Admin Simplicity) ÷ 3
Worked Example
A freelancer earning $90,000 net profit with low liability risk compares sole proprietor vs LLC with S-Corp election.
- Sole proprietor: $90K × 15.3% SE tax ≈ $12,717 FICA + federal income tax (~22% marginal) ≈ $12,900 = $25,617
- LLC + S-Corp election: $55K reasonable salary × 15.3% FICA ≈ $8,415 + federal income tax on salary & distribution ≈ $12,900 + $1,500 payroll/CPA = $22,815
- S-Corp election saves: $25,617 − $22,815 = $2,802/year
📌 S-Corp election saves ~$2,800 annually at $90K net profit, the FICA savings on the distribution portion outweigh the extra payroll and compliance cost.
Why This Matters
Tax efficiency
The right structure saves $2,000-10,000+ annually. Above ~$50K net profit, an LLC with S-Corp election typically wins on self-employment tax alone.
Liability protection
LLCs and corporations protect personal assets from business debts. Sole proprietors have unlimited personal liability.
Professional credibility
LLCs and Inc./Corp. entities appear more established to larger clients. Some enterprise buyers require vendors to be incorporated.
Common Mistakes
❌ Electing S-Corp too early
Below $40K net profit, sole proprietor is usually better. S-Corp payroll and Form 1120-S filing add $1,500-$2,500/year in CPA and payroll fees.
❌ Ignoring reasonable compensation rules
The IRS requires S-Corp owners to pay themselves a reasonable salary before taking distributions. Setting the salary too low is one of the most common IRS audit triggers for S-Corps.
❌ Not reviewing annually
The optimal structure changes as income grows. Review with a CPA each year.
Industry Benchmarks
| Category | Good | Average | Poor |
|---|---|---|---|
| Under $40K Profit | Sole proprietor / single-member LLC | Either | S-Corp (unnecessary overhead) |
| $50-150K Profit | LLC with S-Corp election | Single-member LLC | No structure review |
| High Liability | LLC or Corp (protection) | LLP | Sole proprietor (risk) |
Source: IRS Statistics of Income Business Tax Return Data 2025
Benchmark data sourced from IRS Statistics of Income Business Tax Return Data 2025.