C Corp vs S Corp (vs LLC) for Startups: 2026 Guide

The one-paragraph answer

If you are raising venture capital, you need a Delaware C corporation. Not because C corps are better, but because S corps are legally incapable of accepting venture money and LLCs create problems for fund investors that no one will tolerate.

If you are building a profitable business you intend to own and draw income from, an S corporation election will almost certainly cost you less in tax.

The rest of this explains why, and what it costs you either way.

The three structures

Why VCs require C corps

Three distinct reasons, and it is worth separating them because founders often collapse them into "investors prefer it."

1. Preferred stock requires multiple classes

Venture financing is built on preferred stock: liquidation preferences, protective provisions, conversion rights, sometimes participation. All of that requires a class of stock separate from founder common.

S corporations are limited to one class of stock. Not "discouraged from" — prohibited. A priced round is structurally impossible inside an S corp.

2. A venture fund cannot legally be an S corp shareholder

S corp shareholders must be individuals, estates, certain trusts, or specific tax-exempt organizations. Partnerships and corporations are prohibited.

A venture fund is almost always a limited partnership. That makes it a categorically ineligible shareholder. It is not a negotiation; the election terminates if a fund buys in.

3. Pass-through income creates real problems for fund investors

This is the one that also rules out LLCs, and it is the least understood.

A pass-through entity distributes taxable income to its owners on K-1s whether or not cash goes with it. Run that through a venture fund to its limited partners and two things happen. Tax-exempt LPs — university endowments, pension funds, foundations — risk unrelated business taxable income, which is taxable to otherwise tax-exempt institutions. Foreign LPs risk effectively connected income, which can create US tax filing obligations for investors who have never set foot in the country.

A C corporation blocks all of it. The corporation pays its own tax, LPs see nothing until an exit, and nobody's tax counsel has to get involved.

The double taxation reality check

C corps are taxed twice: once at the corporate level, once when profits are distributed as dividends. Here is the actual arithmetic on $150,000 of corporate profit, fully distributed to a single shareholder.

```

Corporate taxable income $150,000.00

Corporate tax at 21% $31,500.00

After-tax available to distribute $118,500.00

Qualified dividend tax at 15% $17,775.00

TOTAL TAX $49,275.00

Shareholder keeps $100,725.00

Effective combined rate 32.85%

```

The shortcut: 1 − (0.79 × 0.85) = 32.85%.

If the net investment income tax applies — 3.8% above $200,000 of modified AGI for single filers — the dividend layer rises to 18.8% and the combined rate reaches 35.85%.

Why startups mostly ignore this

Double taxation only bites on distributed profit. Startups do not distribute profit; they reinvest it, frequently while posting losses for years. The second layer of tax is deferred until an exit — and at exit, QSBS can eliminate it entirely.

That is the actual reason the double-taxation objection carries so little weight in venture-backed companies. It is a real cost for a profitable business paying out its earnings, and close to a non-issue for a company chasing growth.

QSBS: the reason C corps can beat pass-throughs at exit

Qualified Small Business Stock under Section 1202 lets you exclude a large share of the gain on qualifying C corporation stock. Only C corporations produce QSBS. Not S corps, not LLCs.

The rules changed materially in 2025, and the applicable date is July 4, 2025:

The tiered holding period is a genuine change in planning. Under the old rules, a four-year exit produced no exclusion at all. Under the new rules it produces 75%.

Two details that most articles get wrong:

• Gain that is not excluded is taxed at 28%, not the usual 15% or 20% long-term capital gains rates. At the three-year tier, half your gain is excluded and the other half is taxed at 28%.

• There is no AMT preference on modern QSBS. The 7% preference item applies only to stock acquired on or before the 2010 legislation. Plenty of published guides still warn about this incorrectly.

When an S corp election is genuinely better

For a profitable, owner-operated business with no plans to raise institutional capital, the S corp election usually wins.

You avoid the corporate layer entirely. You pay yourself a reasonable salary subject to FICA, take the rest as distributions free of self-employment tax, and potentially claim the 20% qualified business income deduction on top. For 2026 the QBI thresholds are $201,750 single and $403,500 joint, below which the wage and service-business limits do not apply.

The full mechanics, including the self-employment tax math and the QBI offset that eats into the headline saving, are in our S corp vs LLC guide.

The constraints to accept: no more than 100 shareholders, one class of stock, no partnership or corporate owners, no non-resident alien shareholders, and a reasonable salary the IRS will not challenge.

Converting from an LLC to a C corp

Plenty of founders start as an LLC and convert when a term sheet appears. It works, and it is common enough to be routine.

The conversion is generally tax-free under Section 351 if the control requirements are met, and the IRS has blessed several mechanical routes.

Two things to know before you assume you can convert later without cost:

1. Your QSBS holding period generally starts at conversion, not when you formed the LLC. Depending on your route, some holding period may carry over, but do not assume it.

2. Section 1202 treats your stock basis as the fair market value of the property contributed. So appreciation that accrued during your LLC years is not eligible for exclusion. Convert an LLC already worth $5,000,000 with $1,000,000 of basis and the first $4,000,000 of gain never qualifies for QSBS.

If you have any real expectation of raising and exiting, that second point is a strong argument for incorporating as a C corp from the start rather than converting later.

Choosing, in practice

Delaware C corporation if you plan to raise venture capital, want QSBS, are issuing equity broadly to employees, or expect international or institutional investors.

S corporation election if the business is profitable, you and a small group own it, you will draw income rather than reinvest indefinitely, and you have no plans to take institutional money.

LLC with default taxation if you are early, uncertain, profit is modest, and you want minimum administrative overhead — with the caveat above about converting later.

The failure mode worth avoiding is defaulting into a structure and discovering the mismatch when a term sheet is already on the table. Choosing the right structure at formation costs nothing; fixing it later costs legal fees, time, and sometimes a meaningful chunk of your QSBS exclusion.

For the mechanics of setting up the C corp itself, see our Delaware C corp guide.

And if you have landed on a Delaware C corp, Rho files it for free, with a $400 refundable deposit returned once you open a Rho account and maintain a $10,000 average checking balance for 60 days. Every document is reviewed by a licensed attorney, your EIN application and 83(b) elections are filed for you, and about 80% of filings complete within 24 hours. Your business account opens in the same flow, so you can bank the same day. Delaware C corporations are supported today, with LLC support coming soon.