S-Corp vs. LLC for Contractors: The Real Math Nobody Shows You

Every contractor hears the same advice eventually: "You should be an S-Corp. You'll save a ton on taxes."

And every time, it's presented as a no-brainer. As if there's no downside, no breakeven point, and no scenario where it doesn't make sense.

That's not true. The S-Corp election saves some contractors a lot of money. For others, it costs more than it saves. And almost nobody shows you the actual math to figure out which camp you're in.

Let me fix that.

How Self-Employment Tax Works (The Problem S-Corp Solves)

When you're a sole proprietor or single-member LLC, every dollar of net profit is subject to self-employment tax. That's 15.3% on the first $168,600 (2024) and 2.9% on everything above that.

So if your contracting business nets $200K, you're paying roughly $27,500 in self-employment tax on top of your income tax. That's the equivalent of a new truck — every year — just in SE tax.

The S-Corp structure lets you split that $200K into two buckets:

1. W-2 salary (subject to payroll taxes — the employer + employee share of FICA)
2. Distributions (not subject to self-employment tax)

If you pay yourself a $90K salary and take $110K in distributions, you only pay FICA on the $90K. The $110K in distributions avoids the 15.3% SE tax entirely.

Savings: roughly $16,830 in avoided SE tax.

Sounds amazing, right? Here's where it gets complicated.

The Costs Nobody Mentions

An S-Corp isn't free to operate. Here's what it actually costs:

Payroll processing: You must run legitimate payroll with proper withholding, quarterly 941 filings, W-2s, and state unemployment reporting. Budget $1,500-$3,000/year for a payroll service.

Additional tax return: S-Corps file Form 1120-S, which is a separate business return on top of your personal 1040. CPA fees for an 1120-S typically run $1,500-$3,000 depending on complexity.

Reasonable compensation analysis: The IRS requires your salary to be "reasonable" for the work you do. If you set it too low, you're inviting an audit. You may need a formal compensation study ($500-$1,500) to defend your number.

State-level costs: Many states charge franchise taxes, annual report fees, or minimum taxes on S-Corps. In New York, for example, there's a fixed dollar minimum tax that doesn't apply to LLCs.

Workers' comp and disability: Your W-2 salary may trigger additional workers' comp premium and state disability insurance obligations that you wouldn't have as a sole proprietor.

Quarterly estimated taxes: These become more complex because you're managing both payroll withholding and estimated payments on distributions.

Total annual overhead of S-Corp status: $4,000-$8,000/year in additional administrative and compliance costs.

The Breakeven Calculation

Here's the math that matters. The S-Corp saves you money only when the SE tax savings exceed the additional costs of maintaining the S-Corp structure.

The formula:

SE Tax Savings = (Net Profit - Reasonable Salary) × 15.3%*

S-Corp Overhead = Payroll + Extra Tax Prep + State Fees + Compliance

Net Benefit = SE Tax Savings - S-Corp Overhead*

Simplified — actual calculation accounts for the Social Security wage base and the employer-portion deduction.

Let's run three scenarios:

Scenario 1: $80K Net Profit

• Reasonable salary: $65K (hard to justify less for a skilled tradesperson)
• Distribution: $15K
• SE tax savings: $15K × 15.3% = $2,295
• S-Corp overhead: ~$5,000
• Net result: LOSE $2,705/year

At $80K, the S-Corp costs you money. You're better off as a simple LLC.

Scenario 2: $150K Net Profit

• Reasonable salary: $85K
• Distribution: $65K
• SE tax savings: $65K × 15.3% = $9,945
• S-Corp overhead: ~$5,500
• Net result: SAVE $4,445/year

At $150K, the S-Corp starts making sense. Not life-changing, but meaningful.

Scenario 3: $300K Net Profit

• Reasonable salary: $110K
• Distribution: $190K
• SE tax savings: $190K × 15.3%* = $24,510 (partially reduced above SS wage base)
• S-Corp overhead: ~$6,500
• Net result: SAVE $18,010/year*

At $300K, the S-Corp is a clear winner. You're saving enough to fund a retirement account.

The Breakeven Point

For most contractors, the breakeven is somewhere between $90K and $120K in net profit. Below that, the administrative costs eat up your savings. Above that, the savings grow rapidly.

But "net profit" means after all business expenses — not gross revenue. A contractor doing $500K in revenue with $400K in costs has $100K in net profit. That's barely above breakeven.

Other Factors to Consider

Retirement contributions: S-Corp owners can make employer contributions to a Solo 401(k) based on their W-2 salary. This can be advantageous for tax deferral, but it also means your salary needs to be high enough to support meaningful contributions.

Health insurance: S-Corp owners who own >2% of the company get a special deduction for health insurance premiums. It's reported on the W-2 but deducted on the 1040. Slightly better treatment than the self-employed health insurance deduction in some cases.

Exit strategy: If you ever plan to sell your business, the S-Corp structure can complicate things. Asset sales vs. stock sales have different tax implications, and S-Corp status limits your buyer pool (no corporate or foreign buyers for S-Corp stock).

Multiple entities: If you have multiple LLCs (common for contractors who separate operations from equipment or real estate), adding S-Corp elections to each one multiplies the compliance costs.

My Recommendation

Here's what I tell my contractor clients:

1. Under $100K net profit: Stay as an LLC. The juice isn't worth the squeeze.

2. $100K-$150K net profit: Run the numbers with your CPA. It might make sense, but the savings are modest. Make sure the administrative burden is worth it to you.

3. Over $150K net profit: You should almost certainly be an S-Corp. The savings are significant and grow every year.

4. Over $250K net profit: S-Corp is a no-brainer, and you should also be looking at retirement plan strategies, equipment timing, and other planning opportunities that compound the benefit.

The Timing Question

You can elect S-Corp status effective January 1 of the current year if you file Form 2553 by March 15. If you miss that deadline, you can file with a reasonable cause statement (the IRS is fairly lenient on late elections) or wait until next year.

Don't elect S-Corp status mid-year unless your CPA specifically recommends it — the short-year return creates unnecessary complexity and cost.

The Bottom Line

The S-Corp election is a powerful tool, but it's not universal. Run the actual numbers for your specific situation before making the switch. And once you do elect, make sure your salary is defensible — the IRS is actively auditing S-Corp owners who pay themselves unreasonably low salaries.

The goal isn't to minimize your salary to zero. The goal is to find the sweet spot where your salary is reasonable and defensible, and the remaining profit flows through as distributions without the 15.3% SE tax hit.

Not sure if S-Corp makes sense for your situation? Schedule a free 20-minute consultation and I'll run the breakeven calculation with your actual numbers.