When a C Corporation Beats an S Corporation
The flat 21 percent rate, the double tax, and the situations — reinvested profits, outside investors, benefits, a planned exit — where the C corporation comes out ahead.
Reviewed by the Fairlight Accounting cross-border tax team — U.S. & Canadian Tax Desks
An S corporation passes profit to owners, taxed once at their rates with a possible qualified business income deduction. A C corporation pays a flat 21 percent, and owners pay again on dividends. The S corporation usually wins when profit is taken out yearly; the C corporation wins for reinvested profit, outside investors, or a planned stock exit.
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How does the tax compare?
| Feature | S corporation | C corporation |
|---|---|---|
| Entity-level tax | None (with exceptions) | 21% flat |
| Owner tax on profit | Ordinary rates on all profit, taken out or not | Qualified dividend rates (0/15/20%), plus 3.8% net investment income tax at higher incomes, only when distributed |
| Qualified business income deduction | Yes, subject to limits | No |
| Retained earnings | Taxed to owners now | Taxed at 21% until distributed |
| Owner fringe benefits | 2% shareholders taxed on most benefits | Owner-employees receive benefits tax-free |
| Qualified small business stock | Not available | Available if requirements met |
| Who can own shares | U.S. individuals, certain trusts, estates; 100-shareholder limit; one class of stock | Anyone, including foreign and entity investors; multiple classes |
| Losses | Pass through to owners (subject to basis and other limits) | Stay in the corporation |
| Self-employment tax | Avoided on distributions, after reasonable salary | Not applicable; owner is an employee |
When does the C corporation win?
- Profit stays in the business. Paying 21 percent and reinvesting beats paying 37 percent personally on money you never took out.
- Outside investors. Venture funds organized as partnerships, other corporations, and nonresident alien owners cannot hold S corporation shares.
- Heavy owner benefits. Health coverage and other employee fringe benefits can be tax-free to C corporation owner-employees, while S corporation owners of more than 2 percent are taxed on most of them.
- A planned sale of stock that can qualify for the Section 1202 exclusion.
- Owners already in the top bracket who would lose the qualified business income deduction to the service-business phase-out.
When does the S corporation win?
- Profit is distributed each year to owners in moderate brackets.
- The owner's labor is most of the profit, and the salary-distribution split saves payroll tax.
- The business expects early losses the owners can use.
- A future sale is likely to be an asset sale, where a C corporation would face two levels of tax.
What are the risks on the C side?
Accumulating profit without a business purpose can attract the accumulated earnings tax; a C corporation holding mostly passive income can be a personal holding company; and personal expenses run through the corporation can be recharacterized as taxable dividends.
Frequently asked questions
Can I switch from C to S later?
Yes, with the built-in gains tax on appreciation at conversion for five years, and limits if the company has accumulated C earnings and passive income.
Can I switch from S to C and back?
You can revoke S status any time; re-electing requires a five-year wait unless the IRS consents.
Does an LLC have to choose one?
By default a single-member LLC is disregarded (taxed like a sole proprietorship) and a multi-member LLC is a partnership; either can elect C corporation treatment on Form 8832 or S corporation treatment on Form 2553.
Does Florida tax corporations?
Yes. Florida's corporate income tax is 5.5 percent of Florida net income above a $50,000 exemption and applies to C corporations. An S corporation files Form F-1120 only when it pays federal tax at the entity level, such as the built-in gains or excess passive income tax.
Official sources
The IRS explains: “S corporations are corporations that elect to pass corporate income, losses, deductions, and credits through to their shareholders for federal tax purposes. Shareholders of S corporations report the flow-through of income and losses on their personal tax returns and are assessed tax at their individual income tax rates.” — Internal Revenue Service, S corporations, https://www.irs.gov/businesses/small-businesses-self-employed/s-corporations
The Form 1120 instructions direct: “Multiply taxable income (page 1, line 30) by 21% (0.21). Enter this amount on line 1a.” — Internal Revenue Service, Instructions for Form 1120 (2025), https://www.irs.gov/instructions/i1120
Next step
Fairlight Accounting handles U.S. domestic, cross-border (U.S.–Canada), and international tax returns, plus bookkeeping, payroll, and CFO advisory. Our U.S. Tax Desk models both structures on your actual profit and distribution plans before an election is made. See pricing or book a free fit call.
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