Choosing between an LLC and an S-Corp is one of the most consequential tax decisions a small business owner can make. The difference often amounts to thousands of dollars in annual tax savings, particularly for profitable businesses. But the right choice depends on your income level, growth trajectory, and willingness to handle additional compliance requirements.
At Silicon Valley Tax, we help Bay Area founders and business owners navigate this decision every day. Here is a comprehensive breakdown of how each structure works and which one is likely to save you the most.
How LLCs Are Taxed by Default
A single-member LLC is a disregarded entity for federal tax purposes. All business income flows through to your personal tax return on Schedule C. A multi-member LLC is treated as a partnership and files Form 1065, with each member receiving a K-1.
The critical issue with default LLC taxation is self-employment tax. Every dollar of net business income is subject to the 15.3% self-employment tax (12.4% Social Security up to the wage base of $176,100 in 2026, plus 2.9% Medicare on all earnings). For high earners, there is an additional 0.9% Medicare surtax on income above $200,000 for single filers or $250,000 for married filing jointly.
For a business earning $200,000 in net profit, the self-employment tax alone is approximately $28,300. That is a significant liability on top of your regular income tax.
How S-Corp Taxation Works
An S-Corp is not a separate entity type. It is a tax election made by filing Form 2553 with the IRS. You can be an LLC that elects S-Corp taxation, or you can incorporate as a corporation and then make the S election.
The key advantage of S-Corp taxation is the ability to split your business income into two categories:
- Reasonable salary -- subject to payroll taxes (FICA)
- Distributions -- not subject to self-employment or payroll taxes
If that same $200,000 business earns S-Corp status and the owner pays themselves a reasonable salary of $90,000, only the salary portion is subject to payroll taxes. The remaining $110,000 taken as distributions avoids the 15.3% self-employment tax entirely, saving roughly $16,830 per year.
Reasonable Compensation: The IRS Requirement
The IRS requires S-Corp shareholders who perform services for the company to pay themselves a reasonable salary before taking distributions. This is not optional, and it is one of the most heavily scrutinized areas in S-Corp audits.
Factors the IRS considers when evaluating reasonable compensation include:
- Training, education, and experience of the shareholder-employee
- Duties and responsibilities performed
- Time devoted to the business
- Comparable salaries for similar roles in the industry and geographic area
- Dividend history of the company
- Overall compensation agreements
A common rule of thumb is that your salary should be at least 40-60% of your net business income, but the actual figure depends on industry benchmarks and your specific role. Setting your salary too low invites IRS scrutiny; setting it too high negates the tax benefits.
When Does the S-Corp Election Make Sense?
The S-Corp election generally starts making financial sense when your net business income consistently exceeds $60,000 to $80,000 per year. Below that threshold, the additional costs of maintaining an S-Corp (payroll processing, additional tax filings, compliance) often outweigh the self-employment tax savings.
| Net Income | LLC SE Tax | S-Corp Payroll Tax (est.) | Annual Savings |
|---|---|---|---|
| $50,000 | $7,065 | $6,120 (salary: $40K) | $945 |
| $100,000 | $14,130 | $8,415 (salary: $55K) | $5,715 |
| $200,000 | $28,260 | $13,770 (salary: $90K) | $14,490 |
| $350,000 | $44,985 | $19,890 (salary: $130K) | $25,095 |
Estimates assume 2026 rates. Actual savings depend on reasonable compensation determination and individual circumstances.
Filing Differences
The filing obligations differ significantly between the two structures:
- Single-member LLC: Schedule C attached to your Form 1040. Quarterly estimated tax payments. No separate business return required.
- S-Corp: Form 1120-S filed by March 15. K-1 issued to each shareholder. W-2 filed for shareholder-employees. Quarterly payroll tax returns (Form 941). Quarterly estimated tax payments for income tax. California Form 100S.
The S-Corp adds meaningful compliance overhead. You will need to run payroll (typically $30-75/month through a payroll provider), file additional returns, and maintain corporate formalities.
California-Specific Considerations
California has several rules that affect this decision for Bay Area business owners:
Franchise Tax
Both LLCs and S-Corps owe California's $800 minimum franchise tax annually. This applies in your first year of operation (California reinstated the first-year exemption but it has since expired for most entities). The franchise tax is due by the 15th day of the 4th month after your entity's tax year begins.
LLC Fee
California imposes an additional LLC fee based on total income (not net income) sourced to California. This fee ranges from $900 (income of $250,000-$499,999) to $11,790 (income of $5,000,000 or more). S-Corps are not subject to this fee, which can be a significant advantage for higher-revenue businesses.
1.5% Net Income Tax
California S-Corps pay a 1.5% tax on net income (minimum $800). This is a corporate-level tax that LLCs taxed as disregarded entities or partnerships do not pay. You need to factor this into your savings calculations.
Pros and Cons at a Glance
LLC (Default Taxation)
- Pros: Simple filing, lower compliance costs, flexible profit allocation (multi-member), no payroll requirement, easier to set up and maintain
- Cons: Full self-employment tax on all net income, California LLC fee for higher-revenue businesses, limited tax planning opportunities
S-Corp (Tax Election)
- Pros: Significant self-employment tax savings, no California LLC fee, established legal framework, potential credibility advantages
- Cons: Payroll obligations, stricter compliance, reasonable compensation requirement, California 1.5% net income tax, additional filing costs, limitations on number and type of shareholders
Making the Right Decision
There is no universal answer to the S-Corp vs. LLC question. The optimal structure depends on your current income, projected growth, how much you are willing to spend on compliance, and your broader financial goals.
As a general guideline:
- Stick with an LLC if your net income is under $60,000, your income fluctuates significantly, or you want the simplest possible setup.
- Elect S-Corp taxation if your net income consistently exceeds $80,000, you are comfortable running payroll, and you want to minimize self-employment taxes.
- Consider a C-Corp if you plan to raise venture capital, want to offer equity compensation (ISOs), or are building a high-growth startup.
The entity structure decision interacts with retirement planning, health insurance deductions, exit strategy, and state tax obligations. We recommend working with a tax professional who understands these interconnections before making your election.
If you are ready to evaluate which structure is right for your business, schedule a free consultation with our team. We specialize in entity structuring and S-Corp elections for Bay Area founders and small business owners.