Most people pick their business entity the same way they pick a gym membership: whatever the guy at the front desk recommended. Then three years and $40,000 in unnecessary self-employment tax later, they find out the “simple” choice was the expensive one. The decision between S Corp, C Corp, or LLC is not a formality you knock out on LegalZoom in nine minutes. It is the single largest lever on your effective tax rate, and in California it carries state-level costs that most online formation services never mention.

Here is the part nobody says out loud: there is no universally correct answer. The right structure depends on your profit level, your payroll tolerance, whether you plan to raise outside capital, how many owners you have, and whether you intend to hold the business for ten years or sell it in three. Anyone who tells you “always elect S Corp” is selling a template, not advice.

Quick Answer

An LLC is a legal structure, not a tax structure. By default, a single-member LLC is taxed as a sole proprietorship and a multi-member LLC is taxed as a partnership, meaning all net profit is hit with 15.3% self-employment tax. An S Corp is a tax election that lets you split profit into reasonable salary (subject to payroll tax) and distributions (not subject to payroll tax), which typically becomes worth the extra cost once net profit clears roughly $60,000 to $80,000. A C Corp is a separate taxpaying entity at a flat 21% federal rate, which only wins when you are retaining earnings inside the business, raising venture capital, or positioning for a Qualified Small Business Stock exclusion.

What Each Entity Actually Is (In Plain English)

The confusion starts because people compare three things that are not the same category of thing. Let’s fix that first.

The LLC: A Legal Shield, Not a Tax Plan

A Limited Liability Company is a state-law creation. It separates your personal assets from business liabilities. That is its job. It does not, by itself, change a single line on your tax return. The IRS treats an LLC as a “disregarded entity” by default (in plain English: for tax purposes, the IRS pretends it does not exist and taxes you directly).

If you are a single-member LLC, your profit flows onto Schedule C of your Form 1040. Every dollar of net profit is subject to self-employment tax at 15.3% up to the Social Security wage base, then 2.9% Medicare above it, plus the 0.9% Additional Medicare Tax once you cross $200,000 single or $250,000 married filing jointly.

Multi-member LLCs file Form 1065 and issue K-1s. Same self-employment tax exposure for active members.

The S Corp: A Tax Election You Layer On Top

An S Corporation is not a legal entity type you form at the Secretary of State. It is a tax election made by filing Form 2553 with the IRS. Your underlying legal entity can be an LLC or a corporation. You keep the legal structure you have and change how the IRS taxes it.

The mechanic that matters: you become an employee of your own company. You pay yourself a reasonable W-2 salary subject to payroll taxes. The remaining profit passes through to you as a distribution, free of self-employment tax. That gap is where the savings live.

The C Corp: A Separate Taxpayer Entirely

A C Corporation pays its own federal income tax at a flat 21% rate on Form 1120. The corporation is a distinct taxpayer. When it distributes profit to you as a dividend, you pay tax again at qualified dividend rates of 0%, 15%, or 20%, plus the 3.8% Net Investment Income Tax if applicable. That is the infamous double taxation.

Double taxation sounds fatal until you realize it only bites when you distribute. If you are reinvesting every dollar back into inventory, equipment, hiring, or R&D, you never trigger the second layer.

S Corp vs C Corp or LLC: The Numbers That Actually Decide It

Forget the theory. Run the math on a business with $150,000 in net profit, single owner, California resident.

Factor	LLC (default)	S Corp Election	C Corp
Self-employment / payroll tax	15.3% on all $150K	15.3% on salary only	Payroll tax on salary only
Entity-level federal tax	None	None	21% flat
CA state entity cost	$800 min + LLC fee	$800 min or 1.5% of net	$800 min or 8.84% of net
Payroll required	No	Yes	Yes
QBI deduction eligible	Yes	Yes	No
Typical annual compliance cost	$500 to $1,200	$2,000 to $3,500	$3,000 to $6,000

The LLC Default Scenario

$150,000 net profit. Self-employment tax applies to 92.35% of that figure, or $138,525. At 15.3% up to the wage base, you are looking at roughly $20,100 in self-employment tax before you pay a dollar of income tax. You get a deduction for half of it, which softens the blow but does not eliminate it.

The S Corp Scenario

Same $150,000. You set a reasonable salary of $70,000 based on what a comparable manager in your industry and region earns. Payroll tax on $70,000 runs about $10,710 total (employer and employee halves combined). The remaining $80,000 flows through as a distribution with zero self-employment tax.

Raw payroll tax savings: roughly $9,400. Subtract $2,500 in additional accounting and payroll costs and the California 1.5% S Corp franchise tax on net income, and you are still netting something in the neighborhood of $5,500 to $6,500 in the first year.

Key Takeaway: The S Corp election generally stops making sense below about $60,000 in net profit, because the fixed compliance costs eat the payroll tax savings entirely.

The C Corp Scenario

$150,000 profit. Pay yourself $70,000 salary. The corporation retains $80,000 and pays 21% federal, or $16,800, plus California’s 8.84% corporate rate of about $7,070. Total entity tax: roughly $23,870 on retained earnings. If you then distribute that money to yourself, you pay dividend tax on top.

For a service business distributing all profit annually, this is clearly the worst outcome. For a manufacturer plowing every dollar into capacity, the math flips.

KDA Case Study: Multi-Member LLC Owner Restructures and Saves $18,400

A two-partner digital marketing agency in Pasadena came to us operating as a California multi-member LLC taxed as a partnership. Combined net profit for the prior year was $340,000, split evenly. Both partners were paying full self-employment tax on their entire distributive share, roughly $23,000 each in SE tax alone. Their prior preparer had filed the returns accurately for three straight years but had never once run an entity comparison.

We modeled three paths: stay as-is, elect S Corp treatment for the existing LLC, or convert to a C Corp and retain earnings for a planned office expansion. The C Corp path looked attractive on paper because of the 21% rate, but both partners needed the cash personally. That killed it.

We filed Form 2553 to elect S Corp status effective the following January 1, set reasonable salaries at $95,000 each based on industry compensation data for agency principals in Los Angeles County, and built out a payroll system with quarterly 941 filings. The remaining $75,000 per partner flowed as distributions.

First-year result: combined payroll tax savings of $21,900, offset by $3,500 in added payroll processing and the California 1.5% franchise tax. Net savings of $18,400. They paid KDA $6,200 for the restructure, entity analysis, payroll setup, and the first year of compliance work. That is a 2.97x first-year return, and the savings repeat annually without additional setup cost.

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.

Why Most Business Owners Pick the Wrong Entity

The mistake is almost always the same: people optimize for formation cost instead of lifetime tax cost. A $99 LLC filing feels like a win in month one. By year three, when you are clearing $180,000 and handing the IRS an extra $11,000 a year in self-employment tax, that $99 was the most expensive discount you ever took.

The second mistake is the opposite error. Owners hear about S Corp savings on a podcast, elect it at $45,000 in profit, and discover they have added $2,800 in payroll and accounting costs to save $2,100 in payroll tax. Negative ROI, more paperwork, and now a late S Corp termination process to unwind.

Most business owners never run the comparison with real numbers from their own books. They rely on a rule of thumb they heard secondhand. The break-even point is not a fixed number. It moves based on your reasonable salary requirement, your state, your health insurance situation, and your retirement plan contributions.

Red Flag Alert: If your S Corp salary is set at an implausibly low number relative to your distributions, you are inviting reclassification. The IRS has won repeated cases where owners took $24,000 in salary and $200,000 in distributions. Reclassification means back payroll taxes plus penalties plus interest. The IRS guidance on S Corporation compensation is explicit that officers performing services must receive reasonable compensation.

California-Specific Costs Nobody Warns You About

Every entity comparison you read online is written for a generic national audience. California changes the math materially.

The $800 Minimum Franchise Tax

Every LLC, S Corp, and C Corp registered in California pays a minimum $800 annual franchise tax to the Franchise Tax Board, regardless of profit. Even at a loss. Even in your first year in many cases.

The LLC Gross Receipts Fee

California LLCs pay an additional fee based on total California gross receipts, not profit. This is the one that blindsides people. The tiers start at $900 for $250,000 in receipts and climb to $11,790 for receipts of $5 million or more. A high-revenue, low-margin LLC can owe thousands in fees on a thin profit.

The S Corp 1.5% Franchise Tax

California does recognize the federal S Corp election, but it still imposes a 1.5% franchise tax on net income with an $800 floor. So an S Corp with $200,000 in California net income pays $3,000 at the state level on top of everything else.

The C Corp 8.84% Rate

California corporations pay 8.84% on net income. Combined with the 21% federal rate, retained earnings face an effective rate near 28% before any distribution tax. That materially weakens the C Corp retention argument in California compared to a no-income-tax state.

This information is current as of 11/11/2026. Tax laws change frequently. Verify updates with the IRS or FTB if reading this later.

How to Decide: A Diagnostic Framework

Stop guessing. Work through these decision points in order.

Choose LLC Default Taxation If:

• Net profit is under $50,000 and not projected to grow fast
• You want minimum administrative burden
• You are running a side business alongside W-2 employment
• The business has losses you want to use against other income
• You hold rental real estate (rental income is not subject to SE tax anyway, so the S Corp election adds cost with no payroll tax benefit)

Choose the S Corp Election If:

• Net profit is consistently above $70,000
• You can defend a reasonable salary that still leaves meaningful distribution room
• You are willing to run formal payroll with quarterly filings
• You have 100 or fewer shareholders, all US individuals or qualifying trusts
• You want pass-through treatment plus payroll tax reduction

Choose the C Corp If:

• You are raising venture capital or taking institutional investors
• You have foreign or entity shareholders that disqualify an S election
• You plan to retain substantially all earnings for growth for several years
• You are positioning for Section 1202 Qualified Small Business Stock treatment on an eventual sale
• You want to offer multiple classes of stock with different rights

If you want to pressure-test your own numbers before a conversation, plug your projected profit into a small business tax calculator and compare the output across scenarios. It will not replace a professional analysis, but it will tell you whether you are in the zone where the election matters.

What Is Reasonable Compensation and How Do I Set It?

This is the question that sinks most DIY S Corp elections. There is no IRS table. There is a facts-and-circumstances test.

The factors the IRS and tax courts weigh include your training and experience, duties and time devoted to the business, what comparable businesses pay for similar services, the company’s dividend history, compensation paid to non-owner employees, and the use of a formula to determine compensation.

Step-by-Step: Documenting a Defensible Salary

1. Pull comparable compensation data for your role, industry, and metro area from Bureau of Labor Statistics occupational wage data or a paid compensation survey. Save the source.
2. Log your actual hours for a representative month. A 20-hour-per-week owner should not be paid like a 60-hour one.
3. Separate your roles. If you do both production work and administration, allocate hours between them and price each at market.
4. Write a one-page compensation memo dated before the first payroll run, documenting the methodology and the number.
5. Revisit annually. If revenue doubles and your salary does not move, that is the pattern examiners look for.

Pro Tip: A commonly cited working heuristic is a salary of roughly 40% to 60% of net profit for service businesses, but treat that as a sanity check, not a substitute for actual comparable data.

Can I Switch Entities Later?

Yes, but the exit doors are not all the same width.

Going from LLC to S Corp is straightforward. File Form 2553 within two months and 15 days of the start of the tax year you want the election to apply to, or make a late election under Revenue Procedure 2013-30 if you have reasonable cause. No gain recognition in most cases.

Going from S Corp to C Corp is easy mechanically, but once you revoke an S election you generally cannot re-elect for five years without IRS consent.

Going from C Corp to S Corp is where it gets expensive. You inherit built-in gains tax exposure under Section 1374 on appreciated assets for a five-year recognition period, and any accumulated earnings and profits create passive income trap risk.

The lesson: entity conversion is easier early and costlier late. If you are in year one and uncertain, the LLC gives you optionality. If you are in year eight with a C Corp holding appreciated real estate, you are largely locked in.

Does the QBI Deduction Change the Analysis?

It does, and this is where a lot of generic advice falls apart. The Section 199A Qualified Business Income deduction allows eligible pass-through owners to deduct up to 20% of qualified business income. C Corps get nothing here.

For a specified service trade or business such as law, accounting, consulting, or health, the deduction phases out above certain taxable income thresholds. Above the phase-out, the QBI advantage of pass-through treatment disappears for those professions, which can make the C Corp 21% rate relatively more attractive for high-income service firms planning to retain earnings.

For non-service businesses, the deduction is subject to W-2 wage and qualified property limitations. Here is the twist: an S Corp pays W-2 wages, which can actually help satisfy the wage limitation that a sole proprietorship cannot meet. So the S Corp election can protect a QBI deduction that would otherwise be limited.

Our entity formation services include modeling the QBI interaction, because getting the salary number wrong in a wage-limited scenario can cost more than the payroll tax savings it generates.

What If I Have Multiple Businesses?

Multi-entity owners frequently over-structure. Three LLCs means three $800 minimum franchise taxes in California, three sets of books, three returns. Sometimes that separation is worth it for liability isolation or different partner groups. Often it is not.

A common cleaner structure: one S Corp as the operating entity, with separate single-member LLCs holding real estate or high-liability assets, disregarded up into the parent where appropriate. This gets you liability separation without multiplying tax returns.

For owners with holdings across entities, the planning gets layered fast. Reviewing the complete guide to S Corp tax strategy in California will fill in the operational details that a single comparison article cannot cover. If you are weighing the minority ownership angle specifically, our breakdown of C Corp versus S Corp treatment for minority holders covers traps that general comparisons miss entirely.

Common Questions Before You File

Do I need a new EIN to elect S Corp status?

No. If you are electing S Corp treatment for an existing LLC, you keep your existing EIN. You are changing tax treatment, not forming a new entity. You will need the EIN to open payroll accounts and file Forms 941 and W-2.

What happens if I miss the Form 2553 deadline?

You can request late election relief under Revenue Procedure 2013-30 if you can show reasonable cause, you intended to be treated as an S Corp from the requested date, and you have filed consistently with that treatment. Relief is generally available within three years and 75 days of the intended effective date. Attach a reasonable cause statement to the Form 2553.

Can an S Corp have a loss year?

Yes, and the loss passes through to shareholders subject to basis, at-risk, and passive activity limitations. But note that you still owe the California $800 minimum franchise tax, and if you paid yourself a salary you still owe the payroll taxes on it. A loss does not erase those obligations.

Is an LLC taxed as an S Corp still protected from liability?

Yes. The tax election has no effect on your state-law liability shield. Your LLC operating agreement, your maintenance of corporate formalities, and your separation of personal and business finances determine liability protection. The IRS election does not touch it.

Do single-member LLCs in California still file a separate return?

Yes. Even though the IRS disregards a single-member LLC, California requires Form 568 along with the $800 minimum franchise tax and any applicable gross receipts fee. Skipping it generates penalties that compound quickly.

The Documentation You Need Before Any Conversion

Before you change anything, assemble these:

• Last two years of complete profit and loss statements, not just tax returns
• Current year profit projection with seasonality noted
• A list of all owners, their ownership percentages, and their residency and entity status
• Your current operating agreement or bylaws
• Any outstanding loans, including owner loans to the company
• Fixed asset schedule with original cost and current book value
• Health insurance and retirement plan details for owners

That last item matters more than people expect. S Corp owner health insurance premiums must be included in W-2 wages to be deductible, and the interaction with a Solo 401(k) contribution limit depends entirely on your salary figure. Set the salary without modeling the retirement contribution and you may cap your own deferral.

The Bottom Line on Entity Selection

The correct entity is the one that matches your profit level, your capital plans, and your tolerance for administrative overhead. It is not a permanent decision, but it is an expensive one to get wrong for several years running.

Run the actual numbers from your actual books. Compare the three scenarios side by side with California costs included. Then decide. The difference between a well-chosen structure and a default one is commonly five figures a year for a business clearing six figures in profit.

The IRS is not hiding this from you. Nobody ever sat you down and showed you the math.

Book Your Entity Structure Analysis

If you are running an LLC with profit above $70,000 and you have never had someone model what an S Corp election would actually save you after California franchise tax and payroll costs, you are guessing with real money. Our team will build a side-by-side comparison using your own numbers, set a defensible reasonable salary, and tell you plainly whether a change is worth it or whether you should stay where you are. Click here to book your consultation now.