An S Corp Is a Tax Election, Not a Type of Company
The misconception behind almost every version of this question is that S corporations and C corporations are two different things you form. They are not. You form a corporation, or an LLC, under state law, and then federal tax law decides how to treat it. Every corporation starts life as a C corporation. It becomes an S corporation only when the owners file a one-page election with the IRS, Form 2553, and it stays one only while it keeps qualifying. Nothing changes at the state level, with the same entity, the same liability shield, and the same annual report.
The LLC makes this clearer, not murkier. An LLC is a state-law wrapper with no fixed tax identity of its own. With one owner and no elections it is invisible to the IRS, taxed like a sole proprietorship. With two or more owners it defaults to partnership taxation. And in either case it can elect to be taxed as an S corporation or a C corporation without touching its state paperwork. So the entity-choice decision is really two decisions stacked, which state-law wrapper (that one shapes governance and liability, covered on our member-managed versus manager-managed page, and if someone told you the wrapper must come from Delaware, read this first), and which federal tax box. This page is about the second decision, which is usually the one worth more money.
The Double Tax, and Who Actually Pays It
A C corporation is a taxpayer in its own right. It pays a flat 21% federal income tax on its profits, a rate the July 2025 tax law kept and made permanent. Then, when it hands profits to its owners as dividends, the owners pay tax again on the same dollars. That is the double tax, and for a closely held business whose owners live on the profits, it is exactly as bad as it sounds, because every dollar of profit runs the gauntlet twice on its way to your household.
An S corporation pays no federal income tax of its own in the ordinary case. Profits pass through to the owners and show up on their personal returns, taxed once, whether or not the cash was actually distributed. One level of tax instead of two is the headline reason most profitable small businesses end up with pass-through treatment.
But the double tax only bites when money comes out. A C corporation that plows every dollar back into growth pays its 21% and stops there, which for a high-bracket owner can be less than the pass-through tax on the same profits. That is why the C corporation is not automatically the loser of this comparison; it is the loser for owners who take the money out, which is most owners of most private companies. The question to ask is not which structure has a better reputation. It is where your profits will actually go.
S Corp vs C Corp vs LLC: The Head-to-Head Table
Side by side, with the partnership-taxed LLC included, because for most private companies it is the third real contender and often the winner.
Swipe the table sideways to compare all three.
| Factor | S corporation | C corporation | LLC (partnership-taxed) |
|---|---|---|---|
| What it is | A tax election on a corporation or LLC | The default tax status of every corporation | The default for a multi-owner LLC |
| Levels of tax | One (owners taxed on profits) | Two (21% corporate tax, then tax on dividends) | One (owners taxed on profits) |
| Who can own it | Up to 100 shareholders; US individuals, certain trusts, estates only | Anyone, including unlimited shareholders, entities, funds, and foreign investors | Anyone, including people, entities, and foreign owners |
| Ownership classes | One class of stock only (voting differences allowed) | Common, preferred, multiple series | Flexible units, waterfalls, special allocations |
| 20% pass-through deduction | Yes (income limits apply) | No | Yes (income limits apply) |
| QSBS eligibility | No | Yes (up to $15 million of gain excluded) | No (units never qualify) |
| Florida income tax | Generally none | 5.5% on profits | None at the entity level |
| Appreciated real estate | Trapped (taxable to remove) | Trapped (taxable to remove) | Can generally come out without tax |
The row that disqualifies the most companies is not the tax row. It is who can own it, together with the one-class-of-stock rule right below it, and those two deserve their own section.
The S Corporation Eligibility Rules (and the Traps)
S status is a deal with conditions, and every condition is a tripwire that can terminate the election, sometimes retroactively and sometimes without anyone noticing for years. The company must be domestic. It can have no more than 100 shareholders. Those shareholders must be US individuals, certain kinds of trusts, or estates, which rules out partnerships, corporations, and nonresident aliens. Tax residency is the test, not citizenship, so a green-card holder qualifies while a founder who moves abroad and gives up US tax residency can quietly kill the election for everyone. There is a narrow trust exception under which a nonresident alien may be a potential beneficiary of a specially electing trust, but a nonresident alien can never hold the shares directly. This is why many of our cross-border and international clients simply cannot use an S corporation, whatever its tax appeal.
Then comes the rule that surprises sophisticated owners, one class of stock. Every share must carry identical rights to distributions and to liquidation proceeds; only voting rights may differ. That single sentence forecloses most of what growing companies do with their equity. No preferred stock, so a venture round with a liquidation preference terminates the election the day it closes. No special allocations, so two owners cannot split profits 70/30 while owning 50/50 the way a partnership-taxed LLC can. No profits interests for key employees. Even a shareholder agreement or an LLC operating agreement with partnership-style distribution language can be argued to create a second class of stock, which is why an LLC that elects S status needs its operating agreement rewritten to match the election, not left on the partnership template it started with.
Two smaller conditions round out the deal. S corporations generally live on a calendar tax year unless they can justify otherwise, and estate planning gets more constrained, because only certain trusts can hold S corporation stock and a transfer to the wrong one is another termination trigger; which trusts qualify, and how the QSST and ESBT elections work, is covered in can a trust own S-corp stock. If your plan involves trusts owning the business, the structure needs to be checked against these rules first; our page on putting a business in a trust covers that side of the planning.
Not sure which box your company is in, or should be in?
Most owners inherited the answer from a formation website or a years-old default. Book a free 30-minute consult and get the structure chosen on purpose.
Book your free consultHow and When to File the Election
The S election is Form 2553, signed by every shareholder, and the deadline is earlier than most people expect, no more than 2 months and 15 days after the start of the tax year it is supposed to cover. For a calendar-year company that means mid-March, not April, and a business formed mid-year gets 2 months and 15 days from its first day. You can also file any time during the prior year for the year ahead, which is the calm way to do it.
Missing the deadline is common, and the IRS knows it. A late election can generally be rescued for up to 3 years and 75 days after the intended effective date under a standing relief procedure, if the company always meant to be an S corporation, has reasonable cause for the delay, and its owners filed their personal returns as if the election were in place. Rescue works often enough that people treat the deadline casually, which is a mistake; relief is a request, not a right.
For an LLC there is a shortcut worth knowing. An LLC that wants C corporation treatment files Form 8832, the check-the-box election. But an LLC that wants S status does not need to file both forms; a timely Form 2553 by itself is treated as also choosing corporate classification, one filing instead of two. In our engagements the division of labor is simple. We advise the choice, paper the entity so its documents match the election, and coordinate the filings with your CPA, who runs the returns and the payroll that the election requires.
The Florida Tax Angle
Florida sharpens this whole decision, in one direction. The state has no personal income tax, so profits that pass through to Florida-resident owners, from an S corporation or a partnership-taxed LLC, arrive free of state tax. But Florida does tax C corporations, at 5.5% of profits, on top of the federal 21%. A Florida C corporation therefore pays two governments before its owners see a dividend, while its pass-through neighbor pays neither the state nor the entity-level federal tax.
The quirk worth knowing is the filing rule. An S corporation in Florida generally does not owe the corporate tax and in most years does not file a Florida corporate return at all. The exception is the unusual year the S corporation owes federal tax at the entity level, most commonly built-in gains in the years after a C-to-S conversion; in that year, a Florida return comes due too. A converted company that thinks it left Florida filings behind can get a surprise notice, so the conversion plan should include the state side, not just the federal one.
What Actually Drives the Decision
Strip away the folklore and a handful of drivers decide nearly every case. The first is the payroll-tax play, which is the reason the S election exists in most small-business plans. A working owner takes a reasonable W-2 salary, and profits above that salary flow through free of payroll taxes. The play is legitimate, audited, and entirely dependent on the salary being defensible; the mechanics and the trap are covered on our paying-yourself page.
The second is the 20% pass-through deduction. Owners of S corporations and partnership-taxed LLCs can generally deduct up to 20% of qualified business income, a benefit the July 2025 tax law made permanent, with income limits that squeeze service businesses at higher brackets. C corporations get no version of it. Your CPA runs the numbers; the structural point is that the deduction narrows the gap between pass-through rates and the corporate rate, and it only exists on the pass-through side.
The third pulls hard the other way, qualified small business stock. Stock in a qualifying C corporation, held long enough, can produce up to $15 million of federally tax-free gain per shareholder at a sale, and only a C corporation can issue it. Stock issued while a company is an S corporation never qualifies, a fact that has cost founders millions at exits they did not see coming when they filed the election. If a sale of the company for a large number is even a possibility, read our QSBS page before choosing pass-through treatment. C corporations also carry the quieter advantages, such as unlimited investors, preferred stock for venture rounds, richer deductible fringe benefits for owner-employees, and retained earnings taxed at a flat 21% while they compound inside the company.
Last, the conversion paths, because this is not a one-time decision. An LLC that layers on an S election has made the cheapest, most reversible choice available; revoking S status is a simple filing, though returning to it generally means a five-year wait. Converting a C corporation to an S corporation works but drags the built-in gains tax behind it. Appreciation from the C years stays taxable at the corporate rate if the company sells those assets within five years of converting. The structures are movable. The tax consequences of moving are what need mapping before, not after.
When Each Structure Wins
The solo consultant clearing $150,000. An LLC with an S election is the standard answer, and usually the right one. A defensible salary, payroll-tax-free distributions above it, the 20% deduction on the pass-through income, and no Florida tax at any level. The election costs little and reverses if the business changes shape.
The venture-bound startup. A C corporation, and from as early as possible. Investors' funds cannot hold S corporation stock, preferred rounds violate the one-class rule anyway, and the QSBS clock only runs on C corporation stock, so years spent as a pass-through are years of exclusion eligibility thrown away. The double tax rarely matters for a company reinvesting everything and aiming at a stock sale rather than dividends.
The family operating business. S corporation or partnership-taxed LLC, and the ownership roster usually decides. All-US family owners who want simple proportional economics fit the S corporation well; families who want unequal profit splits, entity owners, or trust-heavy estate planning often fit the partnership-taxed LLC better, because it tolerates all three. This is also where the entity choice and the estate plan have to be designed together rather than in sequence.
The foreign owner. The S corporation is off the table entirely, so the choice collapses to a C corporation or a partnership-taxed LLC, driven by treaty positions, withholding, and what the owner does with the profits. One structure that looks simple and is not is the foreign-owned single-member LLC. It files nothing for income tax but carries its own dedicated IRS reporting, covered on our Form 5472 page, with five-figure penalties for skipping it.
The real estate holder. Almost never a corporation of either kind. A building that appreciates inside a corporation cannot come out without tax on the whole gain, because the tax law treats the distribution as a sale at fair market value even though no money changed hands. There is no tax-free exit, and the problem grows with every year of appreciation. A partnership-taxed LLC can generally distribute property to its members without that hit, which is why rentals belong in LLCs; the Florida-specific reasons are on our rental property LLC page.
Structuring engagements at this firm are flat-fee, quoted at the consult once we know what your situation actually needs; our pricing page shows how we work. The election filings themselves run through your CPA, with our office coordinating so the documents and the returns tell the same story.
Frequently Asked Questions
What Is the Difference Between an S Corp and a C Corp?
One federal tax election, and that is genuinely all. Under state law they can be the identical company. A C corporation pays its own flat 21% federal income tax, and when it pays profits out as dividends the shareholders pay tax again, the double tax. An S corporation pays no entity-level federal income tax in the ordinary case; profits pass through to the owners and are taxed once, on their personal returns, whether or not the cash is distributed. The price of S treatment is a strict set of eligibility rules, no more than 100 shareholders, US owners only, one class of stock. Which arrangement saves money depends on whether profits come out of the company or stay in, and on what the eventual exit looks like.
Is an LLC an S Corp or a C Corp?
By default, neither. An LLC is a state-law wrapper with no fixed federal tax identity. One owner and no elections means it is taxed like a sole proprietorship; two or more owners means partnership taxation. The LLC can then elect to be taxed as an S corporation or a C corporation without changing anything at the state level. So the common comparison of LLC versus S corp is really a comparison between two tax treatments of the same entity, and most of the S corporations you meet in small business are LLCs that filed a one-page election. The real question is never which one to form; it is which tax box to put the company you form into.
Can a Non-US Citizen Own an S Corporation?
It depends on tax residency, not citizenship. A resident alien, someone with a green card or enough days of US presence to be a US tax resident, can be an S corporation shareholder. A nonresident alien cannot, and this rule has teeth. If a single share ends up held by a nonresident alien, by sale, gift, inheritance, or a shareholder moving abroad and losing US residency, the S election terminates for the whole company. There is one narrow exception involving a special kind of trust, where a nonresident alien may be a potential beneficiary without killing the election. For a genuinely foreign owner, the working choices are a C corporation or an LLC taxed as a partnership, each with its own reporting obligations.
When Is the Deadline to Elect S Corporation Status?
Form 2553 is due no more than 2 months and 15 days after the start of the tax year the election is to cover, which for a calendar-year company means mid-March, or it can be filed any time during the prior year. Every shareholder has to sign. Miss the window and the election normally waits a year, but the IRS grants late-election relief generously in practice. A company that intended to be an S corporation, has reasonable cause for the delay, and whose owners filed their returns as if the election were in place can generally get relief for up to 3 years and 75 days after the intended effective date. We coordinate the filing itself with your CPA so the election, the payroll setup, and the return all say the same thing.
Does Florida Tax S Corporations?
Generally no, and this is one of the quiet advantages of pass-through status for a Florida business. Florida imposes a 5.5% corporate income tax on C corporations. S corporations are generally exempt and in most years do not even file a Florida corporate return; a filing is required only in the unusual year the S corporation owes federal tax at the entity level, such as built-in gains after a conversion. And because Florida has no personal income tax, the profits that pass through to Florida-resident owners land free of state tax entirely. A C corporation in Florida pays the 5.5% every profitable year. For an operating business whose owners live here, that difference compounds.
Can I Switch Between S Corp and C Corp Later?
Yes, in both directions, but the doors swing differently. Dropping S status is simple; shareholders holding a majority of the stock revoke it, and the company is a C corporation going forward, though coming back generally means a five-year wait. Going the other way, from C to S, works but carries the built-in gains tax. Appreciation that built up during the C years stays taxable at the corporate rate if the company sells those assets within five years of the conversion, so the clock and the asset list need planning before the election, not after. The cheapest and most reversible starting point is an LLC, which can begin as a pass-through and layer on an S election, or convert to a C corporation, when the facts justify it.
Should I Put Rental Property in an S Corp?
Almost never, and the reason surprises people because nothing goes wrong at the start. A corporation, S or C, cannot distribute an appreciated building to its owners without tax; the tax law treats the distribution as a sale at fair market value, so the gain comes due even though nobody received a dollar of cash. That means a property that has grown in value is effectively locked inside the corporation, and refinancing plans, estate planning moves, and ordinary restructurings all start triggering tax. An LLC taxed as a partnership can generally move property out to its members without that hit, which is one reason real estate overwhelmingly lives in partnership-taxed LLCs. If your building is already inside a corporation, the options narrow with every year of appreciation, so the review is worth doing now.
Common Situations
The consultant who never elected. A Florida consultant runs $180,000 of profit through a single-member LLC for four years, paying self-employment tax on all of it, because nobody ever mentioned the election. An S election with a documented salary would have saved five figures a year. The fix took one form, a payroll setup, and a conversation with her CPA; the only thing that could not be fixed was the four years already gone.
The startup that elected S in year one. Two founders elect S status for the payroll-tax savings, then land a seed round three years later. The preferred round cannot close on S corporation stock, so the election unwinds at the closing table, and worse, the three years of S-era stock never qualify for the QSBS exclusion, which starts its clock only when C corporation stock is issued. The payroll-tax savings were real and small; the exclusion they cost was potentially enormous.
The building stuck in a corporation. A family put a commercial property into a corporation decades ago on old advice, and it has appreciated ever since. Now the parents want it out, into an LLC, for refinancing and estate planning, and every path out triggers tax on the full gain as if the building had been sold. The restructuring becomes a multi-year planning problem instead of a deed. The same building in a partnership-taxed LLC from the start could have moved freely.
Sources of Law
- Rates and pass-through treatment: 26 U.S.C. §11 (flat 21% corporate rate, retained and made permanent by Pub. L. 119-21, the One Big Beautiful Bill Act, July 4, 2025); 26 U.S.C. §§1363, 1366 (S corporation exemption from entity tax and pass-through of income to shareholders); 26 U.S.C. §199A (20% qualified business income deduction for pass-through owners, made permanent by Pub. L. 119-21). law.cornell.edu
- S corporation eligibility: 26 U.S.C. §1361 (100-shareholder limit; shareholders limited to individuals, certain trusts, and estates; no partnership, corporate, or nonresident alien shareholders, with the electing-small-business-trust potential-current-beneficiary exception; one class of stock, disregarding voting differences); Treas. Reg. §1.1361-1(l) (identical rights to distribution and liquidation proceeds). law.cornell.edu; IRS, S Corporations. irs.gov
- The election and its timing: 26 U.S.C. §1362 (election, revocation, termination; the 2-month-15-day rule; five-year wait after termination); IRS Instructions for Form 2553 (deadline; deemed corporate classification for an eligible entity that timely elects S status; late-election relief under Rev. Proc. 2013-30, generally within 3 years and 75 days of the intended effective date); IRS Form 8832 (entity classification election). irs.gov
- Conversions and exits: 26 U.S.C. §1374 (built-in gains tax; 5-year recognition period under §1374(d)(7)); 26 U.S.C. §311(b) and §336 (corporate distributions of appreciated property taxed as if sold at fair market value); 26 U.S.C. §731 (partnership distributions generally without gain recognition); 26 U.S.C. §1202 (qualified small business stock exclusion, C corporations only, as amended by Pub. L. 119-21). law.cornell.edu
- Florida: Fla. Stat. §220.11 (5.5% corporate income tax rate); Florida Department of Revenue, Corporate Income Tax (S corporation filing required only when federal income tax is paid at the entity level, Form 1120-S line 23c); Fla. Const. art. VII, §5 (no state personal income tax). floridarevenue.com (retrieved 2026-08-08)
Updated on August 8, 2026. Reviewed by Kevin D. Klagge, Esq., Fla. Bar No. 99502. Attorney Kevin Klagge represents families, businesses, and international clients in estate and tax planning, business structuring, and international law, with a focus on Florida legal tools. He litigates estate and business issues in court. This page discusses general principles of federal business taxation that apply throughout the U.S., with Florida-specific notes where indicated; specifics vary by entity, election, and state, and nothing here is legal or tax advice for your situation. Election computations, payroll figures, and the positions taken on your returns are handled with and through your CPA. Federal and state figures are adjusted periodically and may change. No attorney-client relationship is created by reading this page. Do not send confidential information until we have agreed to represent you.