Incorporator The Journal of U.S. Formation
Start Free Quiz
Editorial 7 MIN READ

C-corp vs S-corp entering 2024: the §1202 question

A 21% flat rate, a 29.6% pass-through rate, and a $10M exit exclusion that decides the whole thing

The Editors
Staff, Incorporator.org
7 min read Updated
Contents 7 sections
  1. The rates, cleanly
  2. Why §1202 changes the math
  3. QSBS stacking and the §1045 rollover
  4. Where the C-corp actually loses
  5. State conformity is its own trap
  6. The decision grid
  7. Sources

or 2024, the C-corp versus S-corp choice collapses to one question: will the business ever be sold, and will the founder hold five years to get there. If the answer is yes, §1202 makes the C-corp a tax-free exit up to $10 million per shareholder. If the answer is no, the S-corp wins on annual operating income by about ten points.

Everything else is noise around that axis. The §11(b) corporate rate, the §199A deduction, the NIIT, state conformity gaps: all of it matters, but only as second-order adjustments to the exit-versus-income fork.

The rates, cleanly

Start with what each entity actually pays.

A C-corp pays 21% flat on federal taxable income under IRC § 11(b). That rate has been in place since the Tax Cuts and Jobs Act moved it out of the old 15%-to-35% bracket ladder at the end of 2017, and it survived the Inflation Reduction Act of 2022. Distributions are taxed again at the shareholder level: qualified dividends at 20% for top-bracket holders, plus the 3.8% net investment income tax under § 1411. Integrated top federal rate on distributed earnings is 21% on the first layer plus 23.8% on what remains, which works out to roughly 39.8%.

An S-corp passes income through to the shareholders. The top individual rate in 2024 is 37% under § 1(j), and active pass-through business income generally escapes the NIIT for a materially participating owner. But § 199A, the qualified business income deduction, knocks 20% off the qualifying portion, bringing the effective top rate on QBI to 29.6%. The 2024 taxable-income thresholds where the § 199A phase-in begins are $191,950 single and $383,900 joint, per Rev. Proc. 2023-34. Above those, the specified-service-trade-or-business (SSTB) phase-out and the W-2-wage limitation bite, and the deduction can be reduced or eliminated entirely.

For a founder reinvesting all earnings in the business and drawing a modest W-2 salary, the S-corp's 29.6% beats the C-corp's integrated 39.8% by roughly ten points every year. For a founder who plans to leave earnings inside a C-corp and never distribute them, the 21% rate can look attractive in isolation; the accumulated earnings tax under § 531 and the personal holding company rules under § 541 exist to discourage that strategy, but they apply narrowly in practice.

Why §1202 changes the math

The pass-through advantage on annual income is real. It is also swamped by § 1202 the moment a sale is on the horizon.

§ 1202 exempts qualified small business stock (QSBS) from federal capital gains tax on sale, up to the greater of $10 million or ten times the shareholder's basis in the stock. The exclusion is 100% for stock acquired after September 27, 2010. The cap is per issuer, per taxpayer, which is what makes it load-bearing for founders and early employees.

To qualify, the stock has to be issued by a domestic C-corporation, held by the taxpayer for more than five years, and acquired at original issuance for cash, property (other than stock), or services. The issuing corporation must have had aggregate gross assets of $50 million or less at all times before and immediately after the issuance, measured under § 1202(d). And it must be engaged in a qualified trade or business, which § 1202(e)(3) defines by exclusion: health, law, engineering, architecture, accounting, actuarial science, performing arts, consulting, athletics, financial services, brokerage services, investing and investment management, farming, extraction of natural resources, and any business whose principal asset is the reputation or skill of one or more employees.

The SSTB list is where most service businesses wash out. A two-partner law firm cannot use QSBS no matter how the stock is structured. A SaaS company building software sold to law firms can.

For a founder who owns 100% of a qualifying C-corp and sells for $10 million after five years, § 1202 zeroes out the federal capital gains bill on the stock. For a founder who sells for $40 million and has a $500,000 basis, the cap is the greater of $10 million or ten times basis, which is $10 million here, so $30 million remains taxable at 23.8% (20% long-term plus NIIT). That is still a $2.38 million haircut against what a full 23.8% on $40 million would have been, which is roughly $9.5 million. The exclusion is worth about $2.4 million of after-tax cash in that single example.

QSBS stacking and the §1045 rollover

The $10-million cap is per shareholder, not per company. A founder who gifts QSBS to a non-grantor trust for each of three children, each with its own cap, has in effect multiplied the ceiling fourfold across the family. The IRS has not challenged this aggressively; practitioners treat it as a live planning move as long as the gifts are real transfers and the trusts are separately administered. It is the reason sophisticated estate counsel get involved years before an exit.

§ 1045 handles the case where a founder sells QSBS before the five-year mark. Rolling the proceeds into replacement QSBS within 60 days tacks the original holding period onto the new stock, preserving the path to § 1202. It is useful when an acquirer wants to buy the company in year three and the founder is willing to roll into a new venture rather than cash out.

Neither of these options exists for S-corp stock. Pass-through equity has its own planning tools, but nothing equivalent to a $10 million federal exclusion with a per-shareholder multiplier.

Where the C-corp actually loses

The integrated 39.8% rate on distributed earnings is a real cost for any C-corp that pays dividends. Founders who take money out of a C-corp every year as dividends rather than wages pay double tax on those dollars. The S-corp avoids that entirely; distributions to an S-corp shareholder who has already been taxed on the pass-through income come out with no second layer.

Two recent federal costs apply only narrowly. The book-minimum tax under IRC § 55(b)(2), enacted by the Inflation Reduction Act of 2022, hits C-corporations with more than $1 billion in average adjusted financial statement income over a three-year period. The 1% excise on stock buybacks under § 4501, from the same act, applies only to public C-corporations. Neither reaches a founder-owned private company.

The corporate-level annual compliance burden is heavier for a C-corp (Form 1120 plus more rigorous formalities) than for a simple S-corp (Form 1120-S, K-1s to shareholders, reasonable-compensation rules). In most cases the difference is a few hundred to a few thousand dollars in accounting.

State conformity is its own trap

§ 1202 is federal. States are a patchwork.

California repealed its QSBS exclusion in 2013 after the Cutler v. Franchise Tax Board challenge to the in-state-activity requirement; R&TC § 18152 now taxes the full gain at California's ordinary income rates, which top out at 13.3% for 2024. Pennsylvania, Alabama, and New Jersey are the other notable non-conformers. A California founder selling $10 million of QSBS pays zero federal tax and roughly $1.3 million to Sacramento. The federal exclusion is still worth having, but it is not the clean zero that residents of conforming states get.

An S-corp shareholder in any of these states is taxed on pass-through income at the same ordinary rates they would pay anyway, so the non-conformity problem is unique to the C-corp path and compounds the state's bite on exit.

The decision grid

A founder in a non-SSTB business, with a credible path to an exit or acquisition, and a planning horizon of at least five years, should form as a C-corp. The § 1202 exclusion is the single largest federal tax break available to individual investors in operating businesses, and the annual rate premium over an S-corp is recoverable, often several times over, at a successful exit.

A founder in a services business (law, consulting, financial advice, medical practice) that does not qualify for § 1202, without a sale on the horizon, and with most of the income flowing out as owner compensation or distributions each year, should form as an S-corp. The 29.6% effective rate under § 199A beats the C-corp's integrated 39.8%, and there is no offsetting exit benefit to wait for.

The hard cases are in the middle. A software-adjacent agency that could plausibly be sold in ten years but might just generate cash forever. A manufacturing business with real assets approaching the $50 million gross-assets cap. A founder who wants the option value of § 1202 without committing to the distribution discipline a C-corp requires. For those, the answer is usually C-corp if the QSBS eligibility is clean and the founder has the liquidity to avoid taking dividends, and S-corp if either condition fails.

Rule of thumb: if the business qualifies for § 1202 and the founder can hold five years, form a C-corp; otherwise, form an S-corp.

Sources

Keep reading

More from the journal.