Most California business owners pick their entity structure based on what their formation attorney recommended years ago — or worse, what they found on a Reddit thread. That decision is quietly costing thousands of them $20,000 to $40,000 or more every single year in avoidable taxes.

The s corp vs llc vs c corp vs partnership table comparison is not an academic exercise. It is a live financial decision that determines how much of your business income you actually keep. And in California, where the state franchise tax rules, FTB compliance requirements, and non-conformity traps add layers on top of already complex federal rules, getting this wrong is expensive.

This guide walks through every major entity type, how each one is taxed at both the federal and California state level, and which type fits which business scenario. Real numbers. No filler.

Quick Answer

For most California business owners earning $60,000 or more in net profit, the S Corp delivers the best combined federal and state tax result by eliminating self-employment tax on distributions. LLCs are the most flexible but can be the most expensive for high earners. C Corps are best for venture-backed companies or IP-intensive businesses. Partnerships work well for multi-member real estate and investment structures where flexibility and flow-through treatment matter most.

The Four Entity Types: How Each One Is Actually Taxed

Before diving into comparisons, every term needs a clear definition. Here is how each structure works at the federal level and what California layers on top.

LLC (Limited Liability Company)

An LLC is a state-law entity that provides liability protection but has no default federal tax classification of its own. The IRS treats a single-member LLC as a disregarded entity — meaning the owner reports income on Schedule C of their personal return. A multi-member LLC is treated as a partnership by default and files IRS Form 1065. Either way, all net income flows through to the owner and is subject to self-employment (SE) tax at 15.3% on the first $176,100 and 2.9% above that (2025 thresholds). In California, every LLC pays an $800 annual franchise tax plus a gross receipts fee that starts at $900 for income over $250,000 and climbs to $11,790 for income over $5 million.

S Corporation

An S Corp is a corporation that has elected pass-through tax treatment under IRS Subchapter S via Form 2553. Like an LLC, business income flows to the shareholder’s personal return. The critical difference: owner-employees are required to pay themselves a “reasonable salary,” which is subject to payroll taxes. But profits distributed beyond that salary are not subject to self-employment tax. On $200,000 of net profit with a $70,000 salary, the owner pays SE tax only on $70,000 — not the full $200,000. That saves roughly $19,890 annually. California taxes S Corps at a 1.5% franchise tax rate on net income, with an $800 minimum, and requires a separate FTB Form 3560 election to recognize the S Corp status at the state level.

C Corporation

A C Corp is the default corporate structure. It pays income tax at the entity level — currently 21% federally under the OBBBA — and then shareholders pay tax again when dividends are distributed. This double taxation makes C Corps expensive for owner-operators. However, C Corps can retain earnings at the corporate level at lower rates, access Qualified Small Business Stock (QSBS) exclusions under IRC Section 1202 for up to $10 million in tax-free gains, and are the required structure for VC-funded companies. California taxes C Corps at 8.84% on net income, significantly higher than the 1.5% S Corp rate.

Partnership

A partnership (including general partnerships and LPs) is the default tax treatment for multi-member entities. It files an informational return on Form 1065 and issues Schedule K-1s to each partner. All income flows through to partners and is generally subject to self-employment tax for general partners. Partnerships allow the most flexibility in profit and loss allocations — partners can split income in ratios that do not match ownership percentages, which is impossible in an S Corp. California requires partnerships to pay the $800 franchise minimum and file FTB Form 565. For many business owners with complex ownership structures, a partnership or LLC taxed as a partnership is the most practical option before an S Corp election makes sense.

The S Corp vs LLC vs C Corp vs Partnership Comparison Table

Here is the side-by-side breakdown of how each entity performs across the factors that matter most to California business owners.

Factor	LLC (Default)	S Corp	C Corp	Partnership
Federal Tax Treatment	Pass-through (Sch C or 1065)	Pass-through (1120-S)	Entity-level (1120)	Pass-through (1065)
Self-Employment Tax	On all net income	On salary only	N/A (W-2 wages)	On general partner share
QBI Deduction (20%)	Yes (if eligible)	Yes (if eligible)	No	Yes (if eligible)
CA Franchise Tax Rate	$800 min + gross receipts fee	1.5% on net income ($800 min)	8.84% on net income	$800 min flat
Double Taxation Risk	No	No	Yes	No
QSBS Exclusion Eligible	No	No	Yes (up to $10M)	No
Owner Flexibility	High	Moderate	Low	Very High
Profit Allocation Flexibility	Moderate	None (pro-rata only)	None	Maximum
AB 150 PTE Election Available	Yes (if partnership)	Yes	No	Yes
Payroll Requirement	No	Yes (reasonable salary)	Yes (W-2 wages)	No
Best For	Startups, low income, simplicity	$60K+ net profit earners	VC-funded, IP-heavy, QSBS plays	Real estate, multi-investor deals

For a full deep-dive into the S Corp strategy specifically, see our complete guide to S Corp tax strategy in California.

Where the Real Money Is: The Self-Employment Tax Gap

The single biggest financial difference between these entity types for a working owner is how self-employment tax applies. Most business owners do not realize how large this gap is until they see a side-by-side calculation.

Consider a California consultant earning $180,000 in net business profit:

As a Default LLC (Sole Proprietor or Single-Member)

• SE tax: 15.3% on first $176,100 = $26,943
• SE tax: 2.9% on remaining $3,900 = $113
• Total SE tax: approximately $27,056
• Federal income tax (at roughly 22–24% marginal): approximately $39,600
• California income tax at 9.3%: approximately $16,740
• CA LLC gross receipts fee: $900
• Combined estimated tax burden: approximately $84,296

As an S Corp (Same $180,000 Net Profit, $70,000 Salary)

• Payroll taxes on $70,000 salary: approximately $10,710
• SE tax on remaining $110,000 distribution: $0
• Federal income tax (same marginal rate): approximately $39,600
• California income tax: approximately $16,740
• CA S Corp franchise tax: $2,700 (1.5% of $180,000)
• Combined estimated tax burden: approximately $69,750

Total annual savings: approximately $14,546 — simply from changing the entity structure. Want to model your specific numbers? Use this small business tax calculator to estimate how your business profit translates to tax under different entity structures.

That is not a one-time savings. That is $14,546 every year, compounding forward. Over a decade, that is over $145,000 in real money returned to the owner — without changing the business at all.

KDA Case Study: Sacramento Consultant Restructures and Saves $16,200 in Year One

A Sacramento-based management consultant came to KDA in mid-2025 operating as a single-member LLC. She was earning approximately $195,000 in annual net profit and had been told by her previous CPA that the LLC was “fine for her situation.” She was paying over $28,000 per year in self-employment taxes alone.

KDA performed a full entity analysis and identified that she was well past the threshold where an S Corp election made financial sense. We filed Form 2553 with the IRS and FTB Form 3560 for California recognition. We structured a reasonable salary of $72,000 — substantiated by comparable role salary data — and set up a simple payroll system through Gusto.

In her first full year as an S Corp, her self-employment and payroll tax liability dropped from $28,300 to $11,016. After accounting for the payroll administration fee and the California franchise tax differential, her net annual savings came to $16,200. She paid KDA $2,800 for the restructuring and annual advisory work. That is a 5.8x return in the first year alone.

She also benefited from the permanent 20% Qualified Business Income (QBI) deduction available under the One Big Beautiful Bill Act, which further reduced her federal taxable income by $24,600 on her distributable profit — adding another $5,412 in federal tax savings on top of the SE tax reduction.

Ready to see how we can help you? Explore more success stories on our case studies page to discover proven strategies that have saved our clients thousands in taxes.

The C Corp Trap Most California Business Owners Fall Into

C Corps make sense in a narrow set of circumstances. Outside those scenarios, they are among the most expensive structures available to a California business owner.

Here is the math that most people skip. A California C Corp earning $200,000 in net profit pays:

• Federal corporate tax at 21%: $42,000
• California corporate franchise tax at 8.84%: $17,680
• After-tax retained earnings: $140,320

If the owner then distributes those earnings as dividends:

• Qualified dividends are taxed at 15–20% federally depending on the owner’s bracket
• California taxes dividends as ordinary income at up to 13.3%
• On the full $140,320, that adds another $20,000–$37,000 in combined taxes

Total tax on that $200,000 of profit when distributed: potentially $77,000 to $97,000 — compared to roughly $55,000–$65,000 under an S Corp structure.

The scenarios where a C Corp actually wins: founders expecting a QSBS exit under IRC Section 1202 (where up to $10 million or 10x invested capital in C Corp stock can be excluded from capital gains tax), companies receiving institutional venture funding that requires C Corp structure, or businesses that intend to retain significant earnings at the entity level rather than distributing them to owners annually.

For all other California business owners — especially solo operators and small firms — the C Corp is a tax efficiency problem, not a solution.

When a Partnership Structure Wins Over the Others

The partnership structure gets underrated in most entity comparison discussions because the conversation defaults to solo operators. But for multi-member businesses — real estate joint ventures, investment partnerships, professional firms with multiple owners — partnerships offer something S Corps simply cannot: flexible profit allocations.

An S Corp must distribute income and loss to shareholders strictly in proportion to ownership percentage. If Partner A owns 60% and Partner B owns 40%, every dollar of profit is split exactly 60/40. No exceptions.

A partnership, by contrast, can allocate income, deductions, and credits in any ratio the partners agree to — as long as the allocation has “substantial economic effect” under IRC Section 704(b). This allows partners who contributed more work or who are absorbing more risk to receive a larger percentage of income without changing their ownership stake.

For California real estate investors operating syndications or multi-family partnerships, this flexibility is worth real money. A managing partner who does all the active work can receive a larger allocation of net income while a limited partner receives depreciation pass-throughs that offset their passive income from other sources. Our entity formation services help business owners and real estate investors structure these arrangements correctly from day one to avoid costly restructuring later.

California AB 150 PTE Election: Available to Partnerships and S Corps

California’s Pass-Through Entity (PTE) elective tax under AB 150 allows S Corps and partnerships — but not C Corps — to pay California income tax at the entity level at a 9.3% rate, generating a federal deduction that partially circumvents the $40,000 SALT cap for 2025 under the OBBBA. For a partnership or S Corp with $400,000 in California-sourced income, this election can generate an additional $11,160 in federal tax savings. LLCs taxed as partnerships are eligible. C Corps are not.

Common Mistake: Staying in the Wrong Entity Structure Too Long

The single most expensive mistake California business owners make is not choosing the wrong entity at formation — it is failing to revisit the entity decision as income grows.

An LLC is the right choice when a business is generating under $40,000 in net profit annually. The self-employment tax cost is manageable, and the administrative overhead of running payroll for an S Corp is not worth it. But the moment net profit consistently exceeds $60,000 to $80,000, the S Corp election becomes financially superior — and the longer an owner waits, the more they have permanently overpaid.

The IRS allows late S Corp elections under Revenue Procedure 2013-30 in certain circumstances, but this has specific deadlines and criteria. California FTB Form 3560 has its own separate filing window. Missing either deadline means waiting another full tax year.

Pro Tip: If you formed an LLC in 2023 or 2024 and your net profit has now exceeded $80,000, the cost of retroactive restructuring is almost certainly less than what you are currently overpaying in self-employment tax each year. A single strategy session with a qualified tax advisor can quantify the gap within 30 minutes.

Red Flag Alert: The FTB Form 3560 Trap

Many California business owners file IRS Form 2553 and receive their federal S Corp approval — then assume they are done. They are not. California does not automatically recognize a federal S Corp election. FTB Form 3560 must be filed separately within two months and 15 days of the start of the tax year for which the election is intended. Failure to file this form means California continues to tax the business as a C Corp at 8.84%, even while the IRS treats it as an S Corp. This is one of the most costly compliance gaps KDA sees in new clients.

How to Choose the Right Entity for Your Situation in 2026

The decision framework below is not a one-size-fits-all template. But it provides a starting point for the most common scenarios.

Choose an LLC (Default) If:

• Net profit is consistently under $50,000 annually
• You are in the early startup phase and expect losses
• You want maximum simplicity and minimal administrative overhead
• You are testing a business model before committing to payroll compliance

Elect S Corp Treatment If:

• Net profit consistently exceeds $60,000 to $80,000
• You can justify and document a reasonable owner salary
• You are willing to run payroll through a service like Gusto or ADP
• You want access to the QBI deduction on distributable profits
• You want to leverage the California AB 150 PTE election

Consider a C Corp If:

• You are raising institutional venture capital
• You anticipate a QSBS-eligible exit under IRC Section 1202
• You plan to retain most earnings at the entity level without distribution
• You are building an IP-intensive business that benefits from the FDDEI export deduction

Use a Partnership or Multi-Member LLC If:

• You have multiple partners with different contribution levels
• You need flexible profit and loss allocations that do not match ownership percentage
• You are structuring a real estate syndication or investment vehicle
• You want to pass depreciation deductions and passive losses to specific investors

Frequently Asked Questions

Can I change my entity type after I have already formed?

Yes. An LLC can elect S Corp tax treatment at any time by filing IRS Form 2553. A C Corp can convert to an S Corp, though the built-in gains tax window (IRC Section 1374) applies for five years post-conversion on any pre-conversion appreciated assets. Partnerships can elect to be taxed as an S Corp only through formal restructuring. These transitions have specific deadlines, so timing matters significantly.

Does forming an S Corp in California cost more than an LLC?

Yes, modestly. An LLC pays the $800 annual franchise tax plus a gross receipts fee. An S Corp pays the $800 minimum or 1.5% of net income, whichever is greater, plus the cost of running payroll. For high-earning businesses, the S Corp franchise tax savings versus the LLC gross receipts fees can further compound the annual tax advantage.

What is the QBI deduction and which entities qualify?

The Qualified Business Income (QBI) deduction, made permanent under the One Big Beautiful Bill Act, allows eligible taxpayers to deduct up to 20% of qualified business income. It is available to S Corps, partnerships, and sole proprietors — but not C Corp shareholders on dividend income. This makes pass-through structures significantly more attractive for most service-based businesses.

Can a single-member LLC be taxed as an S Corp?

Yes. A single-member LLC can elect S Corp tax treatment by filing IRS Form 2553. California requires a separate FTB Form 3560 election. The LLC entity structure stays intact — it is simply taxed differently. This is one of the most common and effective restructuring moves for solo operators earning above $60,000 annually in net profit.

This information is current as of 3/10/2026. Tax laws change frequently. Verify updates with the IRS or FTB if reading this later.

Stop Overpaying Taxes Because Your Entity Is Wrong

If you have been operating as a default LLC or C Corp and your net profit has grown beyond $60,000 annually, there is a strong probability your entity structure is costing you between $10,000 and $40,000 per year in avoidable taxes. The math is not complicated — but getting the transition right requires understanding California’s specific compliance rules, the FTB Form 3560 trap, and the payroll structure requirements that make the S Corp election defensible. Book a personalized consultation with the KDA strategy team and we will run the exact numbers for your situation, identify the right structure, and handle the restructuring from start to finish. Click here to book your consultation now.