Should My Consulting Firm Elect S-Corp? The Break-Even Math

A consulting firm’s S-corp election typically becomes net-positive once net income reaches roughly $75,000–$100,000 a year — below that, the administrative overhead tends to eat most or all of the tax savings. The most common piece of tax advice consulting firm owners receive is “you should be an S-corp.” It is usually correct. It is also usually delivered without the actual math behind it.

Here is the math.

What Does the S-Corp Election Actually Do?

When you operate as a sole proprietor or single-member LLC taxed as a disregarded entity, all of your net consulting income is subject to self-employment tax — 15.3% on the first $184,500 (2026) and 2.9% above that. On $200,000 in net income, you owe roughly $28,000 in self-employment tax before income taxes.

An S-corp changes the structure. Instead of paying SE tax on everything, you:

1. Pay yourself a reasonable W-2 salary
2. Take the remaining profit as an S-corp distribution

The distribution is not subject to self-employment tax (or payroll taxes). Only your salary is. The result: you pay payroll taxes on the salary, but not on the distribution. The difference between total income and salary is the savings zone.

Example at $200,000 net income:

• Sole proprietor SE tax: ~$25,900
• S-corp with $80,000 salary: payroll taxes on $80,000 = ~$12,240 (employer + employee share)
• Annual savings: ~$13,660

What Costs Eat Into the S-Corp Tax Savings?

Running an S-corp is not free. You need to account for:

Payroll processing: You must run W-2 payroll for yourself. Services like Gusto or ADP cost $500–$1,500/year for a single-owner S-corp.

Bookkeeping: The books need to be maintained monthly, with payroll entries, owner distribution records, and year-end reconciliation. Budget $200–$500/month if outsourced.

Tax preparation: Your S-corp files a separate return (Form 1120-S) in addition to your personal return (Form 1040 with Schedule E). CPA fees for both run $2,000–$6,000/year depending on complexity.

State filing fees and franchise taxes: Many states charge annual fees to maintain an S-corp — $800/year in California, $400 in Texas, varying elsewhere. Some states don’t recognize the S-corp election at all.

Total annual overhead: $5,000–$12,000 depending on your state, firm size, and CPA.

Where Is the S-Corp Break-Even Threshold?

Given those costs, the S-corp election typically becomes net-positive when consulting firm net income reaches $75,000–$100,000 per year.

Below that range, the administrative cost of the S-corp structure eats most of the tax savings. Above it, the savings compound significantly.

These are rough figures. Your specific savings depend on your salary level, your state, and what you’re currently paying for bookkeeping and accounting.

How Do You Set the Right S-Corp Salary?

The IRS requires S-corp owner-employees to pay themselves “reasonable compensation” — a salary that reflects what you would pay someone else to do your job. For a solo consulting firm, that is typically the median market rate for your type of work.

There is no precise IRS formula, but reasonable benchmarks:

• Consulting income < $150K: salary of 50–60% of net income
• Consulting income $150K–$300K: salary of 40–50% of net income
• Consulting income > $300K: salary of 35–45% of net income, with documentation

Setting the salary too low — below what the IRS would consider reasonable — is the single most audited aspect of S-corp returns. A $30,000 salary on $400,000 in consulting income is not defensible. A $120,000 salary on $400,000 is.

Setting the salary too high eliminates the tax advantage. See the full salary optimization analysis for the mechanics.

When Does the S-Corp Election Not Make Sense?

Low income years: If your consulting revenue drops to $60,000 or below, the S-corp overhead may exceed the tax savings. Consider whether you want to maintain the structure through a slow year or dissolve and re-elect when income recovers.

Short-term projects: If you are doing consulting for 12–18 months and then returning to W-2 employment, the setup and wind-down costs may not be worth it.

High-complexity states: California’s $800 minimum franchise tax and required LLCs for professional licenses can change the math significantly. Some California consultants find the S-corp break-even is closer to $150,000 in net income.

If you haven’t formed an entity yet: You don’t have to form an S-corp directly. Most consulting firm owners form an LLC and then elect S-corp taxation by filing Form 2553. The LLC provides liability protection; the S-corp election provides the tax benefit. These are separable decisions.

When Is the Deadline to File the S-Corp Election?

The S-corp election must generally be filed by March 15 of the tax year you want it to apply to — or within 75 days of forming a new entity. If you miss that window, you’re looking at a late S-corp election via IRS relief procedures. See how late elections work for consulting firms.

For new consulting businesses, the decision point is: once you project $80,000+ in net income for the year, the election is worth doing. Do not wait until year-end when the window may have closed.

What Does the S-Corp Election Not Fix?

The S-corp election reduces self-employment tax. It does not:

• Reduce income taxes (those are the same)
• Fix a QBI deduction issue (consulting may be an SSTB — see how QBI applies to consulting firms)
• Replace year-round tax planning
• Handle quarterly estimated tax payments automatically

The payroll tax savings are real and meaningful. But the S-corp is a structure, not a strategy. The structure has to be paired with retirement planning, quarterly projections, and deduction capture to produce full results.

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