A 21% corporate tax rate can leave you with less money than a higher personal tax rate. That is the trap behind many S corp vs C corp decisions: owners compare the first tax bill and ignore what happens when profits leave the company. The right comparison follows your money from business revenue to personal spending, reinvestment, and eventual sale.

For California business owners, another layer matters: state entity taxes. This comparison separates federal rules from California rules and uses clearly labeled illustrations, not promised savings. It addresses established operating businesses, independent contractors, employees launching side businesses, and investors considering corporate ownership.

Quick Answer

An S corporation generally passes taxable business income through to its owners, while a C corporation generally pays federal income tax itself at 21%. C corporation dividends can create a second shareholder tax; S corporation owners generally owe tax on allocated income even when the company keeps the cash. Choose based on withdrawals, salary, investors, state taxes, and your exit plan, not the advertised rate.

S Corp vs C Corp: Follow $100,000 Through Both Taxes

Start with the tax structure, not the company name

A corporation is a legal entity created under state law. C corporation treatment is the default federal income tax system for a corporation; S corporation treatment is an election available to qualifying entities. A limited liability company, or LLC, is a different state-law structure that can sometimes elect corporate and S corporation tax treatment.

These labels do not describe the size or professionalism of a business. A one-person consulting company can be a C corporation, and an established company with employees can use S corporation taxation. The IRS explanation of S corporations outlines eligibility and pass-through treatment.

The federal cash-out illustration

Assume a company has $100,000 of taxable profit after deductible salary and other expenses. A C corporation pays $21,000 of federal corporate income tax, leaving $79,000. If it distributes that balance as a qualified dividend, meaning a dividend eligible for preferential individual tax rates, an assumed 15% shareholder rate creates another $11,850 of federal tax.

The combined federal tax is $32,850, leaving $67,150. At an assumed 20% dividend rate, the combined amount becomes $36,800 before any additional investment-income tax. These calculations exclude California tax and use assumed shareholder rates, not rates guaranteed for your household.

By comparison, $100,000 of S corporation pass-through profit taxed at an assumed 24% personal federal rate creates $24,000 of income tax before other adjustments. That leaves $76,000 after this simplified tax calculation. Salary taxes, business deductions, and household income can change the result substantially.

Trap to avoid: The S corp vs C corp comparison is not 24% versus 21%. It is the total tax cost of the same dollars reaching the same destination.

Pay Yourself Correctly Before Comparing Savings

An owner distribution is not a substitute for wages

An S corporation shareholder who performs substantial services generally needs reasonable compensation before taking nonwage distributions. Reasonable compensation means pay supported by duties, hours, experience, and market rates. Payroll taxes fund Social Security and Medicare; distributions generally are not subject to those employment taxes, but relabeling wages does not make them disappear.

Consider a 1099 consultant, meaning an independent contractor receiving nonemployee income, with $180,000 of profit before owner compensation. If a documented salary analysis supports $100,000 of wages, employer payroll taxes and operating costs reduce the remaining business profit. The owner cannot simply call the entire $180,000 a distribution.

For business owners weighing salary and distribution choices, the useful question is how much profit remains after defensible compensation and recurring administration. Our tax planning services focus on that full calculation rather than an arbitrary profit threshold.

Why C corporation salary does not solve everything

A C corporation can generally deduct reasonable employee compensation, including owner wages. Paying salary can reduce corporate taxable income, but it creates personal wage income and payroll obligations. Excessive compensation can also be challenged. A dollar cannot simultaneously be a deductible salary expense and an untaxed owner dividend.

A W-2 employee, meaning someone paid as an employee with wages reported on Form W-2, faces another wrinkle when starting a side business. Existing wages affect the personal Social Security calculation, but a separate corporation still has its own employer payroll obligations. Never multiply every dollar of proposed distributions by 15.3% and call the result guaranteed savings.

Pro Tip: Compare the same owner salary, the same operating expenses, and the same cash withdrawals under both structures. Otherwise, you are comparing different businesses, not different tax elections.

The IRS guidance on S corporation compensation explains the wage issue. For broader context, see KDA’s California S corporation strategy guide; verify year-specific provisions before applying its examples.

Myth to retire: An S election does not turn payment for your labor into tax-free income.

KDA Case Study: An Illustrative Consultant Comparison

This is a hypothetical planning example, not a verified KDA client result. Maya runs a California consulting company and expects $200,000 of taxable business profit after reasonable salary and associated payroll costs. She needs the remaining earnings for household spending rather than business expansion.

Her initial preference is a C corporation because 21% sounds lower than her assumed 32% federal personal rate. A side-by-side model shows $42,000 of corporate federal tax, leaving $158,000. An assumed 15% qualified-dividend rate adds $23,700 when those earnings are distributed. Combined federal tax is $65,700.

Under a simplified S corporation model, $200,000 taxed at an assumed 32% produces $64,000 of federal income tax before any qualifying business-income deduction. The difference is only $1,700, not a dramatic automatic saving. If an assumed $3,000 advisory fee were incurred solely to obtain that first-year federal benefit, the gross benefit-to-fee ratio would be approximately 0.57 times, with a $1,300 shortfall before other effects.

The decision therefore requires California taxes, deduction eligibility, and future withdrawals, not a sales pitch. The fee and tax rates above are illustrative assumptions, not KDA pricing or a forecast. A responsible adviser would model these variables before recommending an election. That is the practical value of the S corp vs C corp comparison: it can reject an attractive-looking change as readily as support one.

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.

California Taxes Can Reverse the Federal Winner

Run a separate state calculation

Under the general California rules used for this illustration, S corporations pay a 1.5% entity-level tax on California taxable income, generally subject to an $800 minimum franchise tax. General C corporations face an 8.84% rate and generally an $800 minimum. Exceptions apply, including special treatment for some financial businesses and qualifying first taxable years.

On an assumed $200,000 California tax base, the simple percentage calculations are $3,000 for an S corporation and $17,680 for a general C corporation. Those are entity-level figures, not total owner taxes. California shareholders generally also report S corporation pass-through income, and California generally taxes individual dividend income at ordinary state income-tax rates.

Check the California Franchise Tax Board S corporation rules and California C corporation guidance before filing. The Franchise Tax Board is California’s income-tax agency. Federal and California taxable income do not always match.

Retaining cash does not mean avoiding tax

An S corporation owner allocated $80,000 of taxable profit can owe personal income tax even if the corporation distributes only $20,000. Establish a written tax-distribution policy, meaning an agreement about cash payments intended to help owners cover taxes on allocated earnings. Check cash availability and legal distribution limits before making those payments.

A C corporation that retains earnings generally avoids immediate shareholder dividend tax on those retained dollars, not corporate income tax. Retention can help fund inventory or expansion, but unreasonable accumulation to avoid shareholder taxes can trigger additional federal tax. Document actual business needs and projected expenditures.

Red Flag Alert: Do not add federal and California headline rates and assume the sum is your exact effective rate. Deductions, tax bases, and payment timing require an integrated calculation.

The Ownership and Exit Mistakes That Cost More Than Payroll

Investor eligibility can decide the structure

Federal S corporation eligibility generally requires a domestic entity, no more than 100 shareholders, eligible owners, and one class of stock. Shareholders generally cannot include partnerships, corporations, or nonresident aliens, although specified trusts and estates can qualify. One class generally means identical distribution and liquidation rights; voting differences can be permitted.

A startup seeking a $2 million investment from a venture fund may need C corporation treatment because the fund’s ownership structure or preferred economic rights do not fit S corporation restrictions. Saving several thousand dollars annually is not useful if the election blocks the financing the business needs.

Asset sales and stock sales produce different bills

In an asset sale, the company sells business property, contracts, or other assets. In a stock sale, shareholders sell ownership interests. A C corporation asset sale followed by distribution of proceeds can create two tax layers. An S corporation often has one federal income-tax layer, but prior C corporation history can create exceptions.

One exception is the built-in gains tax, a corporate-level tax that can apply to certain gains after a C corporation becomes an S corporation. The federal recognition period is generally five years. Review appreciation, prior earnings, and planned sales before converting; changing the election immediately before a sale does not erase the company’s history.

For high-net-worth founders, qualified small business stock, a category of eligible stock under Internal Revenue Code Section 1202, can materially affect the exit calculation. Eligibility depends on acquisition dates, holding periods, issuance, business activity, and asset limits. Do not apply one exclusion figure to every issuance year or assume California follows federal exclusions.

Rental real estate deserves a different starting point

A real estate investor should not assume either corporation is the natural home for a rental. Transferring appreciated property out of a corporation can trigger taxable gain without a third-party sale. A property worth $900,000 with a $500,000 adjusted tax basis, generally cost after tax adjustments, creates a $400,000 appreciation issue worth reviewing before any transfer.

Bottom line: The S corp vs C corp choice must survive your ownership plan and your exit plan, not just this year’s payroll spreadsheet.

Make the Election Only After These Checks

A practical implementation sequence

1. Prepare three years of projected profits, reasonable wages, household withdrawals, and reinvestment.
2. Model federal and California taxes together, including ongoing payroll and return-preparation costs.
3. Review shareholders, trusts, stock rights, financing plans, and existing corporate tax history.
4. Confirm the desired effective date and prepare Form 2553, the federal S corporation election, if appropriate.
5. Obtain required shareholder consents, retain filing evidence, and track the IRS acceptance notice.
6. Set payroll, estimated-tax payments, and owner basis tracking before making distributions.

The general filing window is no later than two months and 15 days after the beginning of the tax year the election should cover, or during the preceding tax year. Weekend, holiday, and late-election relief rules can matter. Use the IRS Form 2553 instructions rather than assuming every business has the same deadline.

Can an LLC elect S corporation taxation?

Yes, if it meets the requirements and completes the appropriate election process. A qualifying LLC’s timely S election can generally also establish corporate tax classification. Coordinate the effective date rather than automatically filing multiple elections.

Does keeping profit inside an S corporation defer owner tax?

Generally no. Owners report their allocated taxable income regardless of cash distributions. Keep income allocation, cash distributions, and basis records separate; they measure different things.

Can I switch back whenever I want?

Not without consequences. Revocation, termination, conversion taxes, and restrictions on a later S election can apply. Request a written transition analysis before changing status.

Are S corporation losses automatically deductible?

No. Basis, at-risk, and passive-activity rules can limit losses. Basis measures tax investment, at-risk rules examine economic exposure, and passive rules consider participation. A reported loss does not guarantee a current deduction.

Which returns does each entity file?

An S corporation generally files federal Form 1120-S and gives owners Schedule K-1 reports of allocated tax items. A C corporation generally files federal Form 1120. California generally uses Form 100S and Form 100 respectively.

Is there a universal profit level where S wins?

No. A $100,000 business with market-rate owner wages of $90,000 presents a different opportunity from one with supported wages of $50,000. Compensation, state taxes, deductions, and administration determine the break-even point.

The lowest advertised rate is not the lowest cost of getting your money home. Verify current-year guidance before implementation; these illustrations are educational, not individualized tax advice.

Choose the Structure That Fits Your Cash and Exit

Before changing your election, get a side-by-side projection of owner take-home pay, California entity taxes, payroll costs, and sale consequences. Book your S corporation versus C corporation strategy consultation and bring your latest return, profit report, payroll figures, and ownership plans so KDA can evaluate the decision using your numbers.