The Most Important Tax Decision for Self-Employed Owners
If you’re self-employed or running a small business, the entity structure you choose can mean thousands of dollars in tax savings — or thousands in unnecessary costs. The comparison that comes up most often: LLC (taxed as a sole proprietor or partnership) vs. S-Corporation.
Both offer limited liability protection. The difference is almost entirely about how self-employment taxes are calculated.
The Self-Employment Tax Problem
When you earn income as a sole proprietor or single-member LLC, your entire net business profit is subject to self-employment (SE) tax, applied to 92.35% of it (your “net earnings from self-employment”):
- 15.3% on the first $184,500 of net earnings (2026 Social Security wage base; $176,100 for 2025)
- 2.9% (Medicare portion only) on earnings above that amount
This 15.3% rate represents both the employee and employer portions of Social Security and Medicare. As a self-employed person, you pay both sides.
Example: $150,000 net profit as a sole proprietor
- SE tax: $150,000 × 92.35% × 15.3% = ~$21,194
- Income tax: separate calculation on top of this
How an S-Corporation Changes the Math
An S-Corporation doesn’t eliminate SE tax — it restructures how your income flows to reduce how much of it is subject to payroll taxes.
As an S-Corp owner-employee, you must pay yourself a reasonable salary. Payroll taxes apply to that salary. But profit distributions above your salary are not subject to payroll taxes.
Example: Same $150,000 net profit, structured as S-Corp
- Reasonable salary: $75,000
- Payroll taxes on salary: $75,000 × 15.3% = $11,475 (split between employer/employee)
- Distribution: $75,000 — no payroll tax
- SE tax savings: ~$9,720 per year
The “Reasonable Salary” Requirement
The IRS requires that S-Corp owner-employees pay themselves a reasonable salary for the services they provide. This is the most scrutinized aspect of S-Corp tax planning.
Key factors the IRS considers:
- What would you pay someone else to do your job?
- Industry compensation data (BLS Occupational Employment Statistics)
- Your hours worked and qualifications
- Dividend history vs. salary history
Setting your salary too low is the primary audit trigger for S-Corps. A tax professional should help you document and justify your reasonable salary.
S-Corp Costs and Requirements
The SE tax savings don’t come free. S-Corps involve real administrative overhead:
| Requirement | Estimated Cost |
|---|---|
| State filing fees (annual) | $50–$800 |
| Payroll setup and processing | $500–$2,000/yr |
| S-Corp tax return (Form 1120-S) | $500–$1,500/yr |
| Bookkeeping requirements | Varies |
Rule of thumb: S-Corp election typically makes sense when net self-employment income exceeds $50,000–$80,000 per year, depending on your state and specific circumstances.
When to Stay an LLC (or Sole Proprietor)
An S-Corp isn’t always the answer. Consider keeping your LLC structure if:
- Net income is below $50,000 — savings won’t cover administrative costs
- You’re in a passive-loss situation — rental real estate often benefits from LLC treatment
- You want maximum simplicity — single-member LLCs have almost no ongoing compliance requirements
- You need allocation flexibility — S-Corps can only have one class of stock; multi-member LLCs offer flexible profit sharing
Real-World Comparison at Different Income Levels
| Net Business Income | SE Tax (Sole Prop) | Payroll Tax (S-Corp, 50% salary) | Annual Savings |
|---|---|---|---|
| $60,000 | ~$8,478 | ~$4,590 + admin costs | Minimal (~$3,900 before admin costs) |
| $100,000 | ~$14,130 | ~$7,650 + admin costs | ~$2,000–$5,500 net |
| $150,000 | ~$21,194 | ~$11,475 + admin costs | ~$5,500–$8,500 net |
| $250,000 | ~$29,850 | ~$19,125 + admin costs | ~$6,500–$9,500 net |
2026 figures. The $250,000 row reflects the $184,500 Social Security wage base and includes ~$278 of Additional Medicare Tax. “Net” subtracts the ~$1,050–$4,300 in annual costs from the table above (bookkeeping not included). Payroll taxes only: the S-Corp also shrinks your QBI deduction, which gives back part of these savings — see the QBI section below. Actual savings depend on reasonable salary determination, state rules, and deductions.
The Qualified Business Income (QBI) Deduction Interaction
The Section 199A QBI deduction adds another layer to this analysis. Both S-Corps and sole proprietors can qualify for a 20% deduction on qualified business income — a benefit the One Big Beautiful Bill Act (OBBBA) made permanent starting in 2026, removing the sunset that had previously been scheduled for the end of 2025.
Key difference: For S-Corps, the QBI deduction is calculated on the business’s pass-through profit after your reasonable salary (and the employer payroll tax on it) has been deducted — not on what you actually distribute. Your W-2 salary never counts as QBI, so every dollar of salary shrinks the base. At $150,000 of profit with a $75,000 salary, the QBI base drops to about $69,263, versus roughly $139,400 for a sole proprietor. This can meaningfully reduce the QBI benefit at certain income levels — something to model carefully before electing S-Corp status.
Should You Convert Your LLC to an S-Corp?
Before making the switch, a proper analysis should include:
- Your projected net income for the next 3–5 years
- Your state’s tax treatment of S-Corps (some states have franchise taxes or minimum fees)
- Your current payroll setup and bookkeeping capacity
- The QBI interaction at your income level
- Whether the administrative burden fits your situation
Frequently Asked Questions
Can I convert my LLC to an S-Corp without dissolving it?
Yes — an LLC doesn’t need to change its legal structure at all. You simply file Form 2553 with the IRS to elect S-Corp tax treatment for an existing LLC, keeping the same liability protection and state registration while changing only how the entity is taxed.
What if I already took a salary lower than “reasonable” this year?
Correct it going forward rather than trying to retroactively fix a completed payroll year — adjust your remaining pay periods to bring the annualized salary up to a defensible level, and document your reasonable-salary analysis for future reference. A pattern of consistently low salary across multiple years is what draws IRS attention, not a single adjustment.
Does the S-Corp election affect my ability to contribute to a Solo 401(k)?
No, but it changes how you calculate the contribution. As an S-Corp owner-employee, your Solo 401(k) employee deferral and employer profit-sharing contributions are based on your W-2 salary rather than net self-employment income, which is a different calculation than for a sole proprietor.
Is there a deadline for making the S-Corp election?
Generally, you must file Form 2553 within 2 months and 15 days of the start of the tax year you want the election to apply to (for a calendar-year business, that’s March 15). Missing this deadline usually means waiting until the following year, though late-election relief is sometimes available with reasonable cause.
Do I need a separate business bank account if I elect S-Corp status?
Yes — this becomes essentially mandatory, not just good practice. Running payroll, tracking reasonable compensation, and maintaining the corporate formalities the IRS expects all require clean separation between business and personal finances, more so than with a simple sole-proprietor LLC.
Next Steps
The LLC vs. S-Corp decision is one of the highest-ROI tax planning moves available to self-employed individuals. But it requires proper analysis — the “right answer” depends on your specific numbers, state, and business situation.
Schedule a business entity consultation with Worth Shield Financial Services to get a personalized analysis of which structure saves you the most. Track deductible expenses with our business deduction tracker, and if you elect S-Corp status, see our guide to estimated tax safe harbor rules for coordinating payroll and personal quarterly payments.
Worth Shield Financial Services specializes in business entity formation and S-Corporation tax planning for self-employed individuals and small business owners.