S Corp vs C Corp (2026): Differences, Taxes & Which to Choose
- What's the difference between an S corp and a C corp?
- How is a C corp taxed?
- How is an S corp taxed?
- S corp vs C corp: side-by-side comparison
- Who can elect S corp status?
- When is a C corp the better choice?
- When is an S corp the better choice?
- How do you choose between them?
- Frequently asked questions
- "S corp" and "C corp" are tax statuses with the IRS, not business types — a corporation (or even an LLC) chooses which one applies.
- A C corp pays its own 21% federal tax, then shareholders pay tax again on dividends — the classic "double taxation."
- An S corp is pass-through: profits skip corporate tax and land on the owners' personal returns once, and owner-employees can save on payroll tax by splitting pay into salary + distributions.
- C corp wins for raising venture capital, foreign or corporate owners, keeping profits in the business, and QSBS stock. S corp wins for most small, profitable, US-owned businesses that pay out their earnings.
- The choice drives your tax bill for years — get an instant quote and we'll model both for your numbers.
Choosing between an S corporation and a C corporation is one of the highest-leverage tax decisions a US business owner makes — it can mean thousands of dollars a year, and it shapes how you raise money, pay yourself, and eventually sell. The confusing part is that both start from the same place. Here's exactly how they differ, how each is taxed in 2026, and how to decide which one fits your business.
What's the difference between an S corp and a C corp?
The single most important thing to understand: "S corp" and "C corp" are federal tax classifications, not entity types. When you form a corporation with your state, it is a C corporation by default. It only becomes an S corporation if it files an election with the IRS (Form 2553) and meets the eligibility rules. An LLC or limited company can also elect to be taxed as either an S corp or a C corp, which is why the same business can wear different tax "hats."
The names come from the subchapters of the Internal Revenue Code: C corporations are taxed under Subchapter C, S corporations under Subchapter S. That one letter changes everything about how the profits are taxed.
How is a C corp taxed?
A C corporation is a separate taxpayer. It files its own return (Form 1120) and pays a flat 21% federal corporate income tax on its profits. So far, so simple — the complication comes when the company distributes those after-tax profits to shareholders as dividends.
Those dividends are taxed again on each shareholder's personal return, at qualified-dividend rates of 0%, 15%, or 20% (plus the 3.8% Net Investment Income Tax for higher earners). This is double taxation: once at the corporate level, once at the shareholder level. A dollar of profit paid out as a dividend can be taxed twice before it reaches the owner's pocket.
The flip side: if a C corp keeps its profits to reinvest rather than paying dividends, that second layer is deferred — the earnings sit inside the company having only been taxed at 21%. That's a real advantage for capital-hungry, growth-stage businesses.
How is an S corp taxed?
An S corporation is a pass-through entity. It usually pays no federal income tax itself; instead its profits, losses, deductions and credits "pass through" to the shareholders, who report them on their personal returns via a Schedule K-1. Profit is taxed once, at each owner's individual rate — no corporate-level layer, and no double taxation on distributions.
The bigger draw for most owners is payroll-tax savings. If you actively work in your S corp, you must pay yourself a reasonable salary (subject to Social Security and Medicare/FICA tax). Any profit above that salary can be taken as a distribution, which is not subject to the 15.3% self-employment/FICA tax. Split your pay sensibly and the savings can be substantial — though the IRS scrutinizes salaries that are unreasonably low.
See what an S corp election could save you. Our S-Corp Tax Calculator compares sole-proprietor tax with an S-corp salary/distribution split using real 2026 IRS rates.
Try the S-Corp Tax Calculator →S corp vs C corp: side-by-side comparison
| Feature | S corp | C corp |
|---|---|---|
| Federal tax | Pass-through (taxed once) | 21% corporate + tax on dividends |
| Double taxation? | No | Yes, on distributed profits |
| Shareholders | Max 100, US individuals only | Unlimited; foreign & entity owners OK |
| Classes of stock | One only | Multiple (common & preferred) |
| Payroll-tax savings | Yes (salary + distributions) | No |
| 20% QBI deduction | Available to owners | Not available |
| Best for | Small, profitable, US-owned firms | Startups raising capital, reinvesting |
Who can elect S corp status?
Not every business can be an S corp. To qualify, the IRS requires that the company:
- Is a domestic corporation or LLC
- Has no more than 100 shareholders
- Has only allowable shareholders — US citizens or residents (individuals), plus certain trusts and estates; no partnerships, corporations, or non-resident aliens
- Has only one class of stock
- Is not an ineligible corporation (such as certain financial institutions and insurance companies)
If you meet all of these, you elect S corp status by filing Form 2553 with the IRS — generally within two months and 15 days of the start of the tax year you want it to take effect. A C corp has none of these restrictions, which is exactly why fast-growing companies default to it.
When is a C corp the better choice?
A C corp usually makes more sense when you plan to:
- Raise venture capital or bring on investors — VCs and institutional funds almost always require a C corp (they can't hold S corp stock, and they want preferred shares)
- Have foreign owners or another company as a shareholder — both are barred from S corps
- Reinvest profits rather than pay them out — earnings stay in the business taxed only at 21%
- Issue multiple classes of stock or offer broad equity compensation
- Potentially benefit from Qualified Small Business Stock (QSBS) — Section 1202 can exclude a large portion of gain when C corp shares are sold, a major exit advantage
- Offer more tax-deductible fringe benefits to owner-employees
When is an S corp the better choice?
For the majority of established, owner-operated US businesses, an S corp is the more tax-efficient home. It tends to win when you:
- Are profitable and take money out of the business — you avoid the second layer of tax on distributions
- Want to cut self-employment tax by paying yourself a reasonable salary plus distributions
- Qualify for the 20% Qualified Business Income (QBI) deduction, which C corp owners don't get
- Have US-based individual owners and a simple ownership structure
- Expect the business to pass losses through to owners in the early years
The trade-off is the added admin: an S corp must run payroll for its owner-employees, file a separate return (Form 1120-S), and keep the reasonable-salary defensible. For most profitable small businesses, the tax savings comfortably outweigh that.
How do you choose between them?
A quick way to sort it: if you're raising outside capital or reinvesting heavily, lean C corp; if you're a profitable business paying its owners, lean S corp. But the right answer depends on your profit level, how much you pay yourself, your plans for investors, and your exit strategy — and the numbers can swing the decision either way.
Because the election has multi-year consequences (and undoing an S election has its own five-year lockout), it's worth modelling both before you file. That's exactly what we do for clients across the US: run your real figures, compare the total tax under each status, and handle the election paperwork if it's worth it. For the official rules, the IRS explains both structures on its S corporations page.
Frequently asked questions
Is an S corp or C corp better for a small business?
For most profitable, US-owned small businesses that pay their owners, an S corp is more tax-efficient because it avoids double taxation and can reduce self-employment tax. A C corp usually only wins if you're raising venture capital, have foreign or corporate owners, or plan to reinvest profits rather than pay them out.
What is double taxation?
Double taxation is when a C corp's profits are taxed twice: first at the 21% corporate rate, and again when they're paid to shareholders as dividends. S corps avoid it because profits are taxed only once, on the owners' personal returns.
Can an LLC be an S corp or a C corp?
Yes. "S corp" and "C corp" are tax classifications, so an LLC can elect to be taxed as either one by filing the right form with the IRS, while keeping its LLC legal structure. Many profitable LLCs elect S corp status specifically to save on self-employment tax.
How do I switch from a C corp to an S corp?
You file Form 2553 with the IRS, generally within two months and 15 days of the start of the tax year you want the S election to apply. You must also meet the eligibility rules — 100 or fewer US individual shareholders and a single class of stock. We can check eligibility and file it for you.
Do C corps get the 20% QBI deduction?
No. The 20% Qualified Business Income deduction applies to pass-through income, so it's available to S corp owners (and sole proprietors and partnerships) but not to C corporations, which are taxed at the flat 21% corporate rate instead.
We'll model your business as both an S corp and a C corp, show you the total tax under each, and handle the election if it saves you money. Get a fixed-fee quote or message us today.
Related reading: S corp vs LLC: which saves you more. Compare the numbers with our S-Corp Tax Calculator, or read the IRS guidance on S corporations.