Running a consulting practice means wearing every hat. Account executive, project manager, delivery lead, and eventually, the person figuring out why their tax bill keeps climbing. Business structure is where that tax story starts, and for solo consultants, the choice between a sole proprietorship, a single-member LLC, and an S Corp election shapes how much you keep every year.
The right answer depends on where you are in your business, what your income looks like, and how much administrative overhead you’re willing to manage. Here’s how to think through it.
Why Consultants Feel the Tax Burden Differently
When you’re self-employed, you pay self-employment tax on your net profit. This is the contribution toward Social Security (12.4%) and Medicare (2.9%) that a traditional employer would split with you. At a combined 15.3% of net profit (up to the annual Social Security wage base, with a reduced rate on earnings above it), this is often the biggest surprise for new consultants.
On top of that, your net profit is still taxed at your ordinary federal and state income tax rate. In a high profit year, the combined hit can feel significant. The question is which structure gives you the most flexibility to manage it.
Sole Proprietorship: The Default and Its Limits
If you’re consulting without any formal business entity, you’re operating as a sole proprietor by default. Your income and business are legally the same thing, and all net profit flows through to your personal tax return.
This works fine at the start. Low overhead, no separate business tax return, no payroll. But as revenue grows, self-employment tax scales with it and there’s no mechanism to reduce it. Every dollar of profit is subject to the full rate. Liability exposure is also worth noting: as a sole proprietor, your personal assets are not shielded from business claims.
The Single-Member LLC: A Meaningful Upgrade
Forming a single-member LLC (SMLLC) adds a layer of legal protection between you and your business without changing how you’re taxed. By default, the IRS treats an SMLLC as a “disregarded entity,” meaning taxes still flow through to your personal return, the same as a sole proprietor.
Where the LLC earns its keep is on the legal side: your personal assets are separate from business liabilities in the eyes of the state. For a consultant with contracts, client relationships, and real business activity, that separation has value.
If you’re early in your consulting practice, still building consistent revenue, or testing whether this is your primary income stream, an SMLLC is likely the right home base. The administrative lift is low, and you can layer on the S Corp election later once the numbers justify it.
The S Corp Election: Where the Tax Math Shifts
The S Corp election is not a separate legal entity. It’s a tax treatment you elect on top of an existing LLC or corporation. What changes is how your profits are classified.
With an S Corp, you split your business income into two buckets: a reasonable salary (subject to payroll taxes) and a distribution (not subject to those taxes). That split is where the potential savings come from.
For example, a business with $150,000 in net profit:
| Net Profit | Subject to SE Tax | SE Tax Owed | |
|---|---|---|---|
| SMLLC | $150,000 | $150,000 | ~$21,200 |
| S Corp (salary: $75,000) | $150,000 | $75,000 | ~$10,600 |
The difference in this example is meaningful. But the election only makes financial sense when those savings outpace the real cost of running the structure correctly.
What the S Corp adds to your plate: You’ll need to run payroll for yourself on a regular schedule and file quarterly payroll tax returns. Your bookkeeping also becomes more involved. Where an SMLLC can get by with basic income and expense tracking, an S Corp requires more comprehensive financial statements, including a profit and loss statement and a balance sheet, to support the business tax return filed each year.
The IRS also requires that you pay yourself a reasonable salary for the work you perform in the business before taking distributions. What “reasonable” means varies by role, industry, and geography. See our guide to reasonable compensation for S Corp owners.
How to Choose Between Sole Proprietorship, Single-Member LLC, and an S Corp Election
| Sole Proprietorship | Single-Member LLC | S Corp Election | |
|---|---|---|---|
| Business Stage | New or early self-employed activity | Early to established | Established, consistent revenue |
| Legal Protection | None | Yes | Yes |
| Tax Reporting | Personal tax return | Personal tax return | Separate business tax return |
| Taxes Applied | SE tax + income tax | SE tax + income tax | SE tax + income tax |
| SE Tax Applied To | All business profit | All business profit | Salary only |
| Payroll Required | No | No | Yes |
| Financial Statements | Profit & Loss | Profit & Loss | Profit & Loss and Balance Sheet |
| Separate Business Tax Return | No | State-level LLC filings may be required | Yes |
| Best For | Testing the waters with little liability concern | Building without overcomplicating; limited savings opportunity with S Corp election | Optimizing an established business; pursuing growth with savings potential |
The S Corp election isn’t a finish line. It’s a tool that makes sense at a specific stage. If the administrative cost of running the structure correctly exceeds what you’d save on self-employment tax, staying as an SMLLC is the right call, and a legitimate one.
A Note on State Taxes
Federal tax treatment gets most of the attention, but state rules vary. Some states have no income tax. Others tax S Corps at the entity level or impose franchise fees. California charges an $800 annual minimum franchise tax regardless of profit level. New York City effectively taxes S Corps as C Corps. These details matter when running the actual numbers and are worth a conversation with a local tax professional before you elect.
If you’re at the point where structure decisions feel like a real lever in your business, Collective is the all-in-one back-office platform built exclusively for solopreneurs, handling everything from formation and bookkeeping to payroll and tax filings.
This content is for educational purposes only and does not constitute legal, financial, or tax advice. Tax rules vary by state and individual situation. Consult a qualified tax professional for guidance specific to your circumstances.
