LLC vs. S-Corp for a Consulting Firm: The Decision Framework

The standard path for most solo consulting firms: form an LLC first, then elect S-corp taxation once net income exceeds roughly $80,000. The question “Should I be an LLC or an S-corp?” is usually the wrong framing — because an LLC and an S-corp are not mutually exclusive, and understanding the actual question makes the answer clearer.

What Do “LLC” and “S-Corp” Actually Mean?

LLC (Limited Liability Company) is a state law entity type that provides liability protection. When you form an LLC, you get separation between your personal assets and your business assets. Creditors of the LLC generally cannot come after your personal property. You file your LLC with your state and pay state filing fees.

S-Corp is a federal tax classification. It is not a separate entity type — it is an election you make with the IRS (Form 2553) that changes how your entity is taxed. A corporation or an LLC can both elect to be taxed as an S-corp.

The correct comparison is not “LLC vs. S-corp.” It is:

• LLC taxed as disregarded entity (sole prop): State liability protection + all income on Schedule C + full SE tax
• LLC taxed as S-corp: State liability protection + income split between salary and distribution + reduced SE tax
• Corporation taxed as S-corp: Similar to LLC-S, with different state law characteristics

For most solo consulting firms, the operative choice is: LLC with no election (disregarded entity) vs. LLC with S-corp election.

When Should Your LLC Stay a Disregarded Entity?

When you form a single-member LLC and don’t elect any federal tax classification, it defaults to a disregarded entity. The LLC does not file a separate federal return. All income and expenses flow to your Schedule C. You pay SE tax on all net profit.

Advantages:

• No payroll setup required
• No separate business return (Form 1120-S)
• No salary requirement
• Simpler administration — one tax return
• Can be converted to S-corp treatment later when income warrants it

Disadvantages:

• Full 15.3% SE tax on all net profit up to the Social Security wage base ($184,500 in 2026)
• At $200,000 in net income, SE tax is ~$25,900 — vs. ~$10,000–$12,000 with S-corp structure

When to stay as disregarded entity: Net consulting income below $75,000–$80,000/year. At that level, the administrative cost of running an S-corp (payroll, separate return, bookkeeping) typically exceeds the SE tax savings. Below $60,000, the disregarded entity is almost always more cost-effective.

How Does Electing S-Corp Taxation Save Your LLC Money?

When you elect S-corp taxation on your LLC, the structure changes:

1. You pay yourself a reasonable W-2 salary
2. Remaining profit passes through to your personal return as K-1 income
3. Payroll taxes apply only to the salary, not to the K-1 distribution
4. You file Form 1120-S (S-corp return) annually in addition to your personal return
5. You must maintain payroll through a payroll service

The tax math: At $200,000 in net income with an $80,000 salary:

• SE tax (disregarded): ~$25,900
• Payroll taxes (S-corp): ~$12,240
• Annual savings: ~$13,660
• Annual additional cost (payroll, bookkeeping, S-corp return): ~$5,000–$9,000
• Net annual benefit: ~$4,700–$8,700

This benefit grows with income. At $400,000 in net income: ~$25,000–$35,000 in net annual savings after overhead.

Full S-corp election analysis with break-even math.

Is a C-Corp Ever the Right Choice for a Consulting Firm?

For most consulting firm owners, the C-corp is the wrong structure. C-corps pay corporate income tax at 21% on profits, and then shareholders pay income tax again on dividends — classic double taxation. There is no salary/distribution split that avoids this.

The C-corp is appropriate in specific situations:

• You plan to raise venture capital or institutional investment (investors prefer C-corp structure)
• You want to retain significant earnings in the business at the 21% corporate rate (rather than passing through to personal rates of 32–37%)
• You have complex equity structures or employee stock option plans

For a solo consulting firm where the goal is maximum personal income at minimum total tax cost, the C-corp typically produces the worst tax outcome.

How Do State Rules Change the LLC vs. S-Corp Math?

The LLC vs. S-corp question isn’t just federal. State rules matter:

California: $800 minimum LLC franchise tax annually, plus an additional LLC fee on gross receipts above $250,000. The LLC + S-corp combination is the standard recommendation, but the cost structure is higher. A solo consulting firm at $150,000 in net income in California may find the break-even for S-corp treatment closer to $120,000–$130,000 after state costs.

Texas: No state income tax. Franchise tax applies but is structured differently. The federal SE tax savings from S-corp election remain the same.

New York / New Jersey: Both states recognize S-corp elections but have additional filing fees and minimum taxes. Factor these in when modeling the net benefit.

State professional licensing: In some states, certain licensed professionals (attorneys, CPAs, doctors) cannot hold their professional license through an LLC — they must use a Professional Corporation (PC) or Professional Limited Liability Company (PLLC). If you hold a professional license in your field, check your state’s rules before forming a standard LLC.

What Does the LLC-to-S-Corp Timeline Look Like for Most Consulting Firms?

Year 1, income < $80K: Form an LLC (single-member, disregarded entity). File Schedule C. Focus on capturing deductions and getting the bookkeeping right. No S-corp election yet.

Year 2–3, income $80K–$150K: Model the S-corp election. File Form 2553 by March 15 if the election makes financial sense. Set up payroll. Establish Solo 401(k) before December 31.

Year 3+, income $150K+: The S-corp election is almost certainly net positive. Optimize salary, maximize retirement contributions, build toward cash balance plan as income grows.

Income above $400K: The S-corp overhead is negligible relative to the tax savings. At this level, the financial structure (salary level, retirement vehicles, QBI optimization) matters more than the basic entity decision.

One Decision vs. Two

The key insight: the LLC and the S-corp tax election are separable. Most consulting firm owners should:

1. Form the LLC immediately — for liability protection regardless of income level
2. Elect S-corp taxation when income supports it — typically when net income exceeds $80,000

You don’t have to dissolve and re-form anything when you add the S-corp election. You simply file Form 2553 with the IRS, and the LLC retains its state law status while changing its federal tax treatment. If you miss the March 15 deadline, late election relief is available in most cases.

The structure decision is not permanent and irreversible. Start simple, grow into complexity when the numbers support it.

This article is educational and reflects general tax principles as of 2024. Consult a licensed CPA for advice specific to your situation.