A Sacramento marketing consultant earning $200,000 in profit asked her attorney to set up a business entity. The attorney formed a general partnership because her husband helped with the books. That single decision cost the couple $63,400 over three years in avoidable self-employment taxes, double-taxed distributions, and California franchise penalties. She never asked whether an S Corp or C Corp or partnership was the right structure. She just signed the paperwork.

That story plays out across California thousands of times a year. The entity you choose determines how much of your profit you keep, how the IRS taxes your distributions, whether you pay self-employment tax on every dollar, and how California stacks its own franchise tax, LLC fees, and bonus depreciation nonconformity on top. Pick wrong, and you hand the government tens of thousands of dollars you did not owe.

Quick Answer

For most California business owners earning $80,000 or more in annual profit, an S Corp saves $8,000 to $22,000 per year in self-employment tax compared to a partnership. A C Corp only wins in narrow scenarios involving venture capital, QSBS exclusions, or heavy retained earnings. A partnership works best when losses need to flow through or when the business has multiple passive investors. The right answer depends on your profit level, distribution plans, growth trajectory, and California compliance costs.

S Corp or C Corp or Partnership: What Each Entity Actually Does to Your Tax Bill

Before comparing numbers, you need to understand the mechanical differences. Each entity type creates a completely different tax outcome on the same dollar of profit.

How an S Corp Taxes Your Income

An S Corporation is a pass-through entity. Profits flow to your personal return on Schedule K-1. You pay income tax at your individual rate. The advantage is the salary-distribution split. You pay yourself a reasonable W-2 salary and take the remaining profit as a distribution. Self-employment tax (15.3% up to the Social Security wage base of $176,100 in 2026, then 2.9% above that) applies only to your salary, not the distribution.

On $200,000 in profit with a $90,000 reasonable salary, you eliminate self-employment tax on $110,000 in distributions. That saves you roughly $15,930 in federal payroll taxes alone. Add the 20% Qualified Business Income (QBI) deduction under IRC Section 199A, now made permanent by OBBBA, and you shave another $22,000 off your taxable income. California taxes S Corps at 1.5% of net income, which on $200,000 equals $3,000.

How a C Corp Taxes Your Income

A C Corporation pays tax at the entity level: 21% federal, plus California’s 8.84% franchise tax rate. When you distribute profits as dividends, those dividends get taxed again on your personal return at qualified dividend rates (0%, 15%, or 20% depending on your bracket, plus the 3.8% Net Investment Income Tax if your modified AGI exceeds $250,000 for married filers). This double taxation is the fundamental disadvantage.

On $200,000 in profit, the C Corp pays $42,000 federal plus $17,680 California franchise tax at the entity level. If you distribute the remaining $140,320, you pay another $21,048 in qualified dividend tax at 15%. Total tax burden: $80,728. Compare that to roughly $43,200 through an S Corp. The gap is $37,528 on a single year of profit.

How a Partnership Taxes Your Income

A partnership is the simplest pass-through structure. All profit flows to partners on Schedule K-1 based on their ownership percentages. There is no entity-level federal tax. However, general partners pay self-employment tax on their entire distributive share. That means every dollar of profit faces the 15.3% SE tax, with no salary-distribution split to soften the blow.

On $200,000 split equally between two general partners, each partner owes SE tax on $100,000. That is roughly $14,130 per partner, or $28,260 total. Through an S Corp with the same two owners, reasonable salaries of $70,000 each would generate approximately $10,710 per person in payroll taxes, saving the business $6,840 total. Scale that to $300,000 or $500,000 in profit, and the SE tax gap between a partnership and an S Corp widens to $12,000 to $22,000 per year.

The Five-Factor Decision Framework for California Business Owners

Choosing between an S Corp, C Corp, or partnership is not a one-variable calculation. Many business owners rely on a single comparison point and miss the larger picture. Here are the five factors that actually determine which entity wins for your situation.

Factor 1: Annual Profit Level

Below $50,000 in profit, the compliance costs of an S Corp (payroll, separate tax return, California’s $800 minimum franchise tax plus 1.5% net income tax) often eat into the SE tax savings. A partnership or sole proprietorship may be simpler and cheaper. Between $60,000 and $100,000, the S Corp starts pulling ahead. Above $100,000, the S Corp advantage becomes substantial. Above $500,000, the decision gets more complex because C Corp retained earnings strategies and QSBS planning enter the conversation.

Factor 2: Distribution vs. Retention Plans

If you plan to distribute most profits to owners, the S Corp wins almost every time because distributions avoid SE tax and the C Corp double-taxation layer. If you plan to retain significant earnings inside the entity for years (to fund growth, acquisitions, or R&D), the C Corp’s 21% flat federal rate may beat the pass-through rate of 37% on high-income owners. But California’s 8.84% corporate rate makes retention more expensive here than in most states.

Factor 3: Investor and Ownership Structure

S Corps are limited to 100 shareholders, all of whom must be U.S. citizens or resident aliens. No entity shareholders are allowed (with limited exceptions for certain trusts and estates). Only one class of stock is permitted. If you plan to raise venture capital, issue preferred stock, or bring on foreign investors, the C Corp is your only realistic option. Partnerships offer the most flexibility: unlimited partners, multiple classes of interests, special allocations of income and loss, and no citizenship restrictions.

Factor 4: California-Specific Tax Layers

California adds complexity that most national tax guides ignore. Here is how each entity stacks up:

Factor	S Corp	C Corp	Partnership
Franchise Tax Rate	1.5% of net income	8.84% of net income	None at entity level
Minimum Franchise Tax	$800	$800	$800 (if LLC)
LLC Gross Receipts Fee	N/A	N/A	$900 to $11,790
Bonus Depreciation	Not allowed (CA)	Not allowed (CA)	Not allowed (CA)
Section 179 Cap	$25,000 (CA)	$25,000 (CA)	$25,000 (CA)
AB 150 PTE Election	Available	Not available	Available

The AB 150 Pass-Through Entity (PTE) elective tax lets S Corps and partnerships pay California income tax at the entity level and claim a federal deduction, effectively bypassing the $40,000 SALT cap under OBBBA. This is a significant advantage for pass-through entities over C Corps in California. For a deeper breakdown of how S Corp strategy works in this state, see our comprehensive S Corp tax guide for California.

Factor 5: Exit Strategy and Timeline

If you plan to sell the business within five years, the C Corp offers one potential advantage: Section 1202 Qualified Small Business Stock (QSBS) exclusion. If you hold C Corp stock for at least five years, you can exclude up to $10 million (or 10x your basis) in capital gains from federal tax. That is a massive benefit for founders planning an acquisition exit. S Corps and partnerships do not qualify for QSBS. However, S Corps allow a stepped-up basis in assets through a Section 338(h)(10) election, which can provide significant buyer benefits and increase your sale price.

Side-by-Side Tax Comparison at Three Profit Levels

Numbers settle arguments. Here is the total annual tax burden (federal plus California) for a single-owner business at three profit levels, assuming the owner distributes all profits, claims the QBI deduction where eligible, and uses the AB 150 PTE election for pass-through entities. If you want to run your own numbers, plug your business profit into this small business tax calculator to estimate your entity-level tax impact.

$100,000 in Annual Profit

Tax Component	S Corp	C Corp	Partnership
Federal Income Tax	$12,400	$21,000 (entity) + $7,900 (dividends)	$12,400
Self-Employment/Payroll Tax	$6,885 (on $45K salary)	$0	$14,130
California Tax	$1,500 (franchise) + $6,200 (personal)	$8,840 (franchise) + $3,200 (dividends)	$800 (min) + $6,200 (personal)
QBI Deduction Savings	($4,400)	$0	($4,400)
Total Annual Tax	$22,585	$40,940	$29,130

S Corp advantage over C Corp: $18,355. S Corp advantage over partnership: $6,545.

$200,000 in Annual Profit

Tax Component	S Corp	C Corp	Partnership
Federal Income Tax	$29,400	$42,000 + $14,800	$29,400
Self-Employment/Payroll Tax	$13,770 (on $90K salary)	$0	$24,885
California Tax	$3,000 + $13,300	$17,680 + $6,400	$800 + $13,300
QBI Deduction Savings	($8,800)	$0	($8,800)
Total Annual Tax	$50,670	$80,880	$59,785

S Corp advantage over C Corp: $30,210. S Corp advantage over partnership: $9,115.

$350,000 in Annual Profit

Tax Component	S Corp	C Corp	Partnership
Federal Income Tax	$63,700	$73,500 + $29,200	$63,700
Self-Employment/Payroll Tax	$17,340 (on $120K salary)	$0	$31,245
California Tax	$5,250 + $25,900	$30,940 + $12,600	$2,500 + $25,900
QBI Deduction Savings	($14,000)	$0	($14,000)
Total Annual Tax	$98,190	$146,240	$109,345

S Corp advantage over C Corp: $48,050. S Corp advantage over partnership: $11,155.

KDA Case Study: Fresno Construction Firm Saves $63,400 After Switching From Partnership to S Corp

Marcus and his brother David ran a general contracting business in Fresno structured as a general partnership (LLC taxed as partnership). Annual profit: $280,000 split 60/40. Marcus’s share was $168,000 and David’s was $112,000. Both paid self-employment tax on their entire distributive shares. Combined SE tax: approximately $38,640 per year. They also missed the AB 150 PTE election and were not claiming the QBI deduction correctly because their CPA treated their LLC fee as a below-the-line deduction instead of a business expense.

KDA restructured the business as an S Corp effective January 1, 2026. We set reasonable salaries at $85,000 for Marcus and $65,000 for David based on industry compensation data and Bureau of Labor Statistics benchmarks. The remaining $130,000 flowed as distributions free of SE tax. We filed the AB 150 PTE election to bypass the SALT cap, corrected the QBI calculation, and implemented a Solo 401(k) for each brother to shelter an additional $23,500 each in pre-tax retirement contributions.

First-year results: Total tax reduction of $21,800. Over three years, the projected savings reached $63,400. KDA’s fee for the restructuring, S Corp election, and first-year compliance: $4,800. That is a 4.5x return on investment in year one alone, with compounding savings every year the business operates as an S Corp.

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 Five Costliest Entity Selection Mistakes in California

Mistake 1: Defaulting to a Partnership Because It Is Simple

Simplicity costs money. A general partnership exposes every partner to unlimited personal liability and forces self-employment tax on every dollar of general partner income. The “ease of setup” savings of $1,000 to $2,000 gets erased by $8,000 to $22,000 in excess SE tax within the first year. Our entity formation services handle the entire setup process so complexity is never a valid reason to pick the wrong structure.

Mistake 2: Choosing a C Corp Because Your Attorney Recommended It

Many business attorneys default to C Corps because that is what they studied in law school. Unless you are raising institutional capital, pursuing QSBS, or retaining significant earnings at the entity level, the C Corp’s double taxation and 8.84% California franchise tax rate will cost you $18,000 to $48,000 more per year than an S Corp on the same profit. Always get tax-specific entity advice from a tax strategist, not just legal counsel.

Mistake 3: Missing the Form 2553 Deadline

To elect S Corp status, you must file IRS Form 2553 by March 15 of the tax year you want the election to take effect (or within 75 days of forming a new entity). Miss this deadline and you are stuck as a C Corp or partnership for the entire year. Late election relief under Revenue Procedure 2013-30 exists, but it requires demonstrating reasonable cause and is not guaranteed. The IRS grants relief in most cases where the entity operated as an S Corp from day one, but the documentation burden is real.

Mistake 4: Ignoring the California Bonus Depreciation Gap

OBBBA restored 100% bonus depreciation at the federal level and raised the Section 179 limit to $2,500,000. California conforms to neither. Under R&TC Sections 17250 and 24356, California caps Section 179 at $25,000 and does not allow bonus depreciation at all. This means every entity type faces a dual depreciation schedule, but the impact hits differently. S Corps and partnerships can use the AB 150 PTE election to offset some of this gap. C Corps cannot. If you are buying $200,000 in equipment, the California depreciation gap alone can cost $8,000 to $15,000 in the first year depending on your marginal state rate.

Mistake 5: Failing to Model the Full Five-Year Cost

Entity selection is not a one-year decision. The compounding tax difference between an S Corp and a C Corp on $200,000 in annual profit is $150,000 to $240,000 over five years. The difference between an S Corp and a partnership is $45,000 to $55,000 over that same period. Running a single-year projection and ignoring the cumulative effect leads to six-figure mistakes that are expensive and time-consuming to unwind.

Three Narrow Scenarios Where a C Corp or Partnership Beats the S Corp

Scenario 1: Raising Venture Capital or Private Equity

Institutional investors require preferred stock, convertible notes, and multiple share classes. S Corps allow only one class of stock. If you are pursuing a Series A or larger round, you need a C Corp or a flexible partnership structure (like an LP with a corporate general partner). The QSBS benefit under IRC Section 1202 further tilts the scale toward C Corps for venture-backed founders who plan to hold stock for five or more years.

Scenario 2: Heavy Retained Earnings With No Distribution Plans

If your business retains $500,000 or more annually and you do not plan to distribute profits for three to five years, the C Corp’s flat 21% federal rate beats the 37% top individual rate for high-income owners. However, California’s 8.84% rate cuts into that advantage significantly. And when you eventually distribute those earnings, the double tax catches up. Model the full lifecycle, not just the retention year.

Scenario 3: Businesses With Substantial Tax Losses

Partnerships offer the most flexible loss allocation rules. Special allocations under IRC Section 704(b) allow partners to direct losses to the partners who can use them most effectively. S Corps pass losses through pro rata based on stock ownership only. If your business is generating losses in its early years and you want to allocate those losses strategically among owners, a partnership structure provides tools that S Corps cannot match.

OBBBA Changes That Shift the Entity Calculus in 2026

The One Big Beautiful Bill Act made several TCJA provisions permanent and added new ones that directly affect the S Corp, C Corp, or partnership decision (see IRS tax reform guidance for official updates):

• Permanent QBI Deduction (Section 199A): The 20% deduction on qualified business income is now permanent. This benefits S Corps and partnerships but not C Corps. At $200,000 in profit, that is a $40,000 deduction saving roughly $8,800 to $14,800 in federal tax depending on your bracket.
• 100% Bonus Depreciation Restored: Federal bonus depreciation is back to 100% for qualifying assets. California still does not conform, creating the dual depreciation schedule that all entity types must manage.
• $40,000 SALT Cap: The state and local tax deduction cap increased from $10,000 to $40,000 under OBBBA. The AB 150 PTE election remains the primary workaround for California S Corps and partnerships. C Corps deduct state taxes as a business expense without SALT cap limitations.
• $2,500,000 Section 179 Limit: The federal Section 179 deduction doubled. California still caps it at $25,000 under R&TC Section 17250.
• No Tax on Tips and Overtime: New OBBBA provisions that affect W-2 employees and may influence reasonable salary calculations for S Corp owner-employees.

Step-by-Step: How to Choose and Implement the Right Entity in California

1. Calculate your projected annual profit for the next three years. If it is below $50,000, a partnership or sole proprietorship may be sufficient. Between $60,000 and $100,000, model the S Corp. Above $100,000, the S Corp is almost certainly the winner unless specific exceptions apply.
2. Determine your distribution vs. retention plans. High distribution businesses favor S Corps. Heavy retention businesses with no near-term distribution plans may benefit from C Corp rates.
3. Assess your ownership structure. Multiple investors, foreign owners, or preferred stock needs push you toward C Corp or partnership. Single or few U.S. owners with one class of equity fit the S Corp perfectly.
4. Model the California-specific costs. Include franchise tax (1.5% S Corp vs. 8.84% C Corp), LLC fees for partnerships, minimum franchise tax, bonus depreciation nonconformity, and AB 150 PTE election savings.
5. File the correct formation documents. Articles of Incorporation with the California Secretary of State, then Form 2553 with the IRS for S Corp election within 75 days of formation or by March 15 of the desired effective year.
6. Set up payroll immediately (S Corp only). You must pay yourself a reasonable W-2 salary before taking any distributions. The IRS uses industry data, geographic compensation surveys, and business revenue to evaluate reasonableness. Underpaying salary is the number one S Corp audit trigger.
7. Elect AB 150 PTE treatment (S Corp or partnership). File the election by June 15 or the original return due date. Make quarterly estimated PTE payments. Claim the federal deduction on your personal return to bypass the SALT cap.
8. Implement retirement plans. S Corp owners can contribute to Solo 401(k) plans as both employer and employee, sheltering up to $69,000 in 2026 ($76,500 if over 50). Partnership general partners can also use Solo 401(k) plans. C Corp owner-employees may benefit from defined benefit plans that shelter up to $350,000 annually for high earners.

Frequently Asked Questions

Can I Switch From a Partnership to an S Corp Mid-Year?

Yes, but the mechanics are complex. You typically need to form a new entity (or convert the existing LLC’s tax classification) and file Form 2553. The IRS generally requires the election to be effective January 1, but late election relief under Revenue Procedure 2013-30 may allow mid-year transitions if you operated consistently as an S Corp from the intended effective date. Work with a tax strategist to avoid creating a short-year partnership return and a short-year S Corp return, which doubles your filing costs.

Does the QBI Deduction Apply to All Three Entity Types?

No. The QBI deduction under IRC Section 199A applies only to pass-through entities: S Corps and partnerships. C Corps do not generate QBI. However, high-income earners in specified service trades (law, medicine, consulting, financial services) face phase-out thresholds. Above $391,600 for married filers in 2026, the QBI deduction begins to phase out for these service businesses, regardless of entity type.

What If My Business Has Both Active and Passive Owners?

This is where partnerships shine. You can designate some partners as limited partners (who do not pay SE tax on their distributive share) and others as general partners. S Corps do not distinguish between active and passive shareholders for payroll purposes, though only shareholders who provide services must receive reasonable compensation. If your business has a mix of working owners and silent investors, a partnership or a hybrid structure (partnership with an S Corp as the managing member) may provide the best tax outcome.

Will Choosing the Wrong Entity Trigger an IRS Audit?

The entity choice itself does not trigger an audit. However, specific behaviors within each entity do. S Corps with owner salaries below industry benchmarks get flagged. C Corps with excessive accumulated earnings above $250,000 face the accumulated earnings tax under IRC Section 531. Partnerships with large losses flowing to limited partners attract passive activity scrutiny. The IRS now uses AI-powered systems including the Palantir SNAP platform to identify statistical outliers across all entity types.

How Does California’s AB 150 PTE Election Change the Comparison?

The AB 150 PTE election allows S Corps and partnerships to pay California income tax at the entity level and claim a federal deduction for that payment, bypassing the $40,000 SALT cap. On $200,000 in California-source income, the PTE election can save $4,000 to $8,000 in federal taxes that a C Corp owner cannot access. This makes pass-through entities even more attractive in California compared to other states.

This information is current as of April 7, 2026. Tax laws change frequently. Verify updates with the IRS or FTB if reading this later.

Book Your Entity Strategy Session

If you are running a California business as a partnership and watching $10,000 to $22,000 in avoidable self-employment tax leave your bank account every year, or if you are stuck in a C Corp paying double tax on every distribution, the fix is straightforward. Book a personalized entity strategy session with our team. We will model your specific profit level, distribution plans, and California tax layers to show you exactly which structure keeps the most money in your pocket. Click here to book your entity strategy consultation now.