S-corp planning
LLC vs S-Corp: Which Business Structure Is Right for You?
An LLC and an S-corp aren't mutually exclusive — most S-corp owners operate as an LLC that elected S-corp tax treatment. The real question is when the S-corp election makes financial sense. Here's the math.
Written by Matt Reese, CPA · 8 min read · Published April 2026·Share on LinkedIn
Key Takeaways
- An LLC is a legal structure that provides liability protection. S-corp is a tax classification. You can be both: an LLC that has elected S-corp tax treatment.
- A single-member LLC taxed as a sole prop pays self-employment tax on 100% of net profit. An S-corp pays payroll taxes only on the owner's W-2 salary — not on distributions.
- The S-corp election only saves money above a certain income level — typically $50,000+ in net profit nationally, $80,000+ in California after accounting for the additional franchise tax.
- Once you elect S-corp, you must run payroll and pay yourself a reasonable W-2 salary. The structure only saves money when correctly implemented.
The confusion most people have
When people ask “should I be an LLC or an S-corp?” they’re usually asking the wrong question. An LLC is a legal structure that protects your personal assets from business liabilities. An S-corp is a tax classification that determines how the IRS taxes your profits.
They’re not alternatives. They operate at different levels. The most common structure for a profitable self-employed owner is an LLC that has elected S-corp tax treatment — you get the liability protection of the LLC and the payroll tax savings of the S-corp election.
The LLC and S-corp are not competing choices. The question is whether to add the S-corp tax election on top of your LLC.
How taxes work for each structure
The difference comes down to self-employment (SE) tax — the 15.3% Social Security and Medicare tax that applies to net business profit.
Single-member LLC (taxed as sole prop): 100% of net profit is subject to SE tax. On $150,000 in profit, SE tax runs roughly $19,500. This is on top of federal and state income tax.
LLC taxed as S-corp: You split your compensation into two parts — a W-2 salary (subject to FICA payroll taxes at 15.3%) and distributions from profits above that salary (no payroll taxes). The savings come from the distribution portion.
| Single-member LLC (sole prop tax) | LLC taxed as S-corp | |
|---|---|---|
| Legal liability protection | Yes | Yes (same LLC) |
| Self-employment / payroll tax | 15.3% on all net profit | 15.3% on W-2 salary only — not on distributions |
| Payroll requirements | None | Must run payroll, file quarterly 941s |
| Separate business tax return | No (Schedule C on your 1040) | Yes — Form 1120-S due March 15 |
| Additional CPA cost | Lower | $1,000–$2,000 more per year |
| Payroll service cost | $0 | $50–$100/month (~$600–$1,200/year) |
| California franchise tax | $800 minimum | $800 minimum + 1.5% of net income |
| Break-even (national) | — | ~$50,000 net profit |
| Break-even (California) | — | ~$80,000–$100,000 net profit |
The break-even calculation
The S-corp election only saves money when the SE tax savings exceed the added compliance costs (payroll service + additional CPA fees). Below a certain profit level, the LLC without the election is simpler and cheaper.
At $150k, the S-corp saves around $3,000 in California — real but not dramatic. At $300k, the same comparison yields $12,000–$15,000 in annual savings. The advantage grows with income because the SE tax savings grow while compliance costs stay roughly fixed.
Run the break-even for your income level
Enter your net profit and state — see whether the S-corp election saves money after compliance costs.
The S-corp election doesn't change the LLC
California makes the math different
California imposes an additional 1.5% tax on S-corp net income on top of the federal structure — plus the $800 minimum franchise tax. This raises the break-even compared to other states.
A California owner at $60,000 net profit might not break even on an S-corp election at all after the 1.5% state tax plus compliance costs eat into the SE tax savings. The national rule of thumb ($50k+ to justify the election) should be adjusted to $80,000–$100,000 for California owners.
California S-corp rules
When to choose each
Stay with LLC (sole prop taxation) when:
- Net profit is consistently below $50,000 ($80,000 in California)
- Your income is unpredictable year to year — the fixed compliance costs sting in low-income years
- You’re in your first year and still building toward stable profitability
- The administrative burden of payroll and a second return isn’t something you want yet
Elect S-corp when:
- Net profit is consistently above $60–80k and you expect it to stay there
- You’re prepared to run payroll and pay yourself a documented, defensible salary
- You have a CPA who handles both the 1120-S and your personal return (or at minimum coordinates both)
- The expected SE tax savings clearly exceed the compliance costs in your state
What changes after you elect S-corp
The election creates a few new obligations that don’t exist for a plain LLC:
- Payroll: You must pay yourself a reasonable W-2 salary through a payroll service. This isn’t optional — it’s the IRS requirement for the election to be valid.
- Form 1120-S: A separate business tax return is due March 15 (extendable to September 15). Your CPA prepares this in addition to your personal 1040.
- Schedule K-1: Your share of S-corp income flows through a K-1 to your personal return. Your CPA handles the filing — but understanding what’s on the K-1 matters for estimated tax payments.
- Distributions: Any profit above your salary can be taken as distributions — no payroll taxes apply. The salary/distribution mix is where the tax savings live.
The S-corp only saves money when it’s run correctly — with a defensible salary and payroll in place from day one.
The timeline and deadlines
To be taxed as an S-corp for a given calendar year, you need to file Form 2553 by March 15 of that year(or within 75 days of forming a new entity). Miss it and you’re waiting until January 1 of the following year — though late election relief is available in many cases.
If you’re reading this in Q1 and the calculator suggests the S-corp election makes sense for your income level, file now. The longer you wait into the year, the shorter your window of potential savings.
You might also read
How to Actually Elect S-Corp Status: Form 2553, Deadlines, and What Happens Next
The calculator said it's worth it. Now what? A step-by-step guide to filing Form 2553, the March 15 deadline, late election relief, and what to set up in the first month as an S-corp.
S-corp planningS-Corp Reasonable Compensation: What the IRS Actually Requires and How to Set Your Salary
The IRS requires S-corp owners to pay themselves a 'reasonable salary' — and has audit procedures to enforce it. What factors the IRS considers, how auditors typically approach S-corp compensation cases, and a practical method for setting a defensible number.
Tax planningSelf-Employment Tax Explained: Rates, Calculation, and How to Reduce It
Self-employment tax is 15.3% on net profit — on top of income tax. How SE tax is calculated, what the deductible half actually saves, and the three ways to reduce it.
Frequently asked
Questions owners actually ask
- Do I need to form a new entity to elect S-corp?
- No. Your existing single-member LLC can elect S-corp tax treatment by filing Form 2553. The LLC remains the legal entity — only how the IRS taxes it changes. You keep the same bank account, contracts, and name. This is the most common approach.
- Can I have an S-corp with business partners or investors?
- S-corps have restrictions on who can be shareholders: all shareholders must be U.S. citizens or permanent residents, there can be no more than 100 shareholders, and there can only be one class of stock. This makes S-corps incompatible with most venture-backed structures. Partnerships or C-corps are typically used when bringing in investors.
- Can I switch back from S-corp to a regular LLC (sole prop taxation)?
- Yes, but it requires filing a revocation with the IRS and there are waiting periods. If you revoke the election voluntarily, the IRS generally won't allow you to make a new S-corp election for five years. This is why it's worth getting the timing right before electing — especially in California where the compliance costs change the breakeven.
- Does an S-corp provide more liability protection than an LLC?
- No. The liability protection comes from the LLC structure, not the S-corp tax election. Both an LLC and an LLC taxed as S-corp provide the same liability shield from personal responsibility for business debts (assuming proper structure and no personal guarantees). The election only changes how you're taxed.
- What happens if I set my S-corp salary too low?
- The IRS can reclassify distributions as wages, triggering back payroll taxes, interest, and penalties. They've won several high-profile cases on this. 'Reasonable compensation' is the standard — approximately what you'd pay someone else to do your job. It's not defined by a formula, but BLS wage data and revenue benchmarks are typically used.
- What's the annual cost of running an S-corp vs a plain LLC?
- Running an S-corp adds roughly $2,000–$4,000 per year in California: payroll service ($600–$1,200), additional CPA fees for the Form 1120-S business return ($1,000–$2,000 more), plus the California 1.5% S-corp franchise tax on net income and the $800 minimum annual tax. Outside California, costs are typically $1,500–$3,000 per year above an LLC.
Take the next step
Turn tax questions into a plan. Talk with Matt or see how we work with operating business owners.
Educational content only.This article is for informational purposes and does not constitute tax, legal, or investment advice. Every owner’s facts are different; consult a qualified CPA and advisor before acting. Tax and accounting services are provided through Matt Reese, CPA; investment advisory services are provided through Measured Risk Portfolios, a registered investment adviser. Matt Reese, CPA and Measured Risk Portfolios are separate entities; clients are not required to engage both.