S Corporation to C Corporation Before Venture or Foreign Money

Can an S corporation take money from a venture fund or a foreign investor?

No, not as a shareholder. An S corporation can't have a partnership (which most venture funds are), any corporation other than a tax-exempt charity, or a nonresident alien as a shareholder, and it can't have more than one class of stock, so a fund's preferred shares are out too (26 U.S.C. 1361(b)(1); Form 2553 instructions, Who May Elect). A round from a fund, a corporation or an investor abroad ends S status one way or another. US citizen or resident individuals can buy the same common stock, voting or nonvoting, without ending it (section 1361(b)(1)(A), (c)(4)). The owners choose how and when:

• Revoke the election, with consent of shareholders holding more than half the shares, filed by March 15 for January 1 (calendar year) or on or before a date you name.
• Let the closing end it: the election ends the day the fund or foreign investor gets its shares.
• Keep the S corporation and put the business into a new C corporation that takes the money.

Each route treats qualified small business stock (QSBS) differently.

Gather before you choose: the cap table and share ledger, every SAFE, note, warrant and side letter, the term sheet, all past Forms 1120-S with Schedules M-2 and K-1, the fixed-asset register with tax basis, and any loan secured by the GPU fleet.

S corporation to C corporation: how do the routes compare?

Is the switch itself taxed?

Revoking or losing the S election is not a sale or a liquidation. The same corporation keeps its GPU servers, contracts and their tax basis; section 1362(e) only splits the year. The cost comes later: the C corporation pays 21% federal tax on its profit, and owners pay again on dividends (see how C corporations are taxed).

Moving the business into a new corporation is tax free under section 351 if the control test is met, with two exceptions (both below): cash or other property back to the S corporation, and debt above basis.

How do we revoke the S election: is there a form, who signs, and by when?

There is no IRS form. The corporation files a signed statement that it revokes its election under section 1362(a), giving the number of shares issued and outstanding, nonvoting shares included (Reg. 1.1362-6(a)(3)). Attach a consent from each consenting shareholder, together holding more than half the shares on the day of revocation. Where shares are community property or held jointly, each co-owner consents (Reg. 1.1362-6(b)(2)). Each consent is signed under penalties of perjury and gives the shareholder's name, address and taxpayer identification number, the number of shares owned and the dates they were acquired, the day the shareholder's tax year ends, the corporation's name and EIN, and the revocation it consents to (Reg. 1.1362-6(b)(1)).

File the statement with the service center listed under Where To File in the Form 2553 instructions, as the Form 1120-S instructions direct. Timing (Reg. 1.1362-2(a)):

A revocation can't reach back further than the first day of the year, and only if filed in time. A revocation can be rescinded before it takes effect, with consent of everyone who consented and anyone who became a shareholder since (Reg. 1.1362-2(a)(4)).

An LLC that elected S status is treated as having chosen to be taxed as a corporation (Reg. 301.7701-3(c)(1)(v)(C)), so revoking leaves it a C corporation, not a partnership. For a way back to LLC treatment, see changing your business structure.

What if the closing itself ends the S election?

The election ends on the day the ineligible shareholder or the preferred stock is issued (section 1362(d)(2)). Attach to the final S-period Form 1120-S a statement giving the termination and its date, and check "S election termination" in Item H, not "Final return", because the corporation goes on (Form 1120-S instructions; Reg. 1.1362-2(b)).

One caution before signing: a SAFE, convertible note, warrant or side letter given to a fund while still an S corporation can itself raise the second-class-of-stock question (Reg. 1.1361-1(l)(4)). Accidental endings and relief are covered in how S corporations are taxed.

Can the S corporation keep its election and put the business in a new C corporation?

Yes. In this route, often called a drop-down, the S corporation contributes the hosting business (GPU servers, colocation data center contracts, staff) to a new corporation for its common stock, and the fund buys preferred stock for cash in the same deal. An S corporation may own stock in a C corporation, even a controlling stake; the Code's passive-income rule names that case (section 1362(d)(3)(C)(iv)).

For section 351, the transferors together must own at least 80% of the vote and of each other class right after the deal. Investors paying cash count as transferors; stock issued for services is not issued for property (Pub. 544). The new company and each transferor owning 1% or more of it afterward (the S corporation and, usually, the fund) attach the statement required by Reg. 1.351-3 to their returns for the year (Pub. 542). The new company gets its own EIN and files Form 1120.

Two traps:

• Debt above basis. A GPU fleet written off with bonus depreciation has almost no tax basis. If the new company takes over a GPU-backed loan larger than the total basis contributed, the excess is gain to the S corporation that flows to the owners' K-1s (section 357(c)), much or all of it ordinary income: depreciation recapture (Pub. 544, chapter 3), and section 1239 when the S corporation owns more than half the new company's value. Liabilities that would be deductible when paid are left out. This gain can change which route costs less.
• Shares moved out of the S corporation lose QSBS. When QSBS passes to a new holder, its status survives a gift, death or certain partnership distributions, not an S corporation's distribution (section 1202(h)(2)).

What do we file for the year we switch?

Two returns for one year: Form 1120-S for the days before the switch and Form 1120 for the rest, both due on the Form 1120 date. That split applies when the S election ends on any day but the first of the year (Reg. 1.1362-3):

Income is split evenly by day unless the corporation elects to use its actual books, by a statement filed with the C short-year Form 1120 (Reg. 1.1362-6(a)(5)). That election needs consent from everyone who was a shareholder in the S short year and everyone on the first day of the C short year, the fund included, so its consent is needed too. Daily splitting is also not allowed if 50% or more of the shares are sold or exchanged during the year. The C corporation pays quarterly estimated tax once it expects $500 or more.

What happens to S corporation profits we never distributed?

The accumulated adjustments account (AAA) tracks taxed but undistributed S profits. Cash paid during the post-termination transition period reduces stock basis instead of being a dividend, up to the AAA (section 1371(e)). That period runs from the day after the last S day to the later of one year or the due date, with extensions, of the last Form 1120-S (section 1377(b)). Only money counts, not property.

After the period, distributions are dividends to the extent of C-year earnings; S years add no earnings and profits (section 1371(c)). If AAA was never tracked, it can be rebuilt from past Schedules M-2, which the Form 1120-S instructions recommend every S corporation keep.

Which shares can qualify for QSBS after each route?

QSBS must be issued by a C corporation that is a qualified small business at issuance (section 1202(c)(1), (d)(1)). The tests are on the QSBS page for startups; here is what each route changes.

For stock acquired after July 4, 2025, the exclusion is 50% after 3 years, 75% after 4 and 100% after 5 or more. If the S corporation owns more than half the new company by vote or value, the two count as one corporation for the $75,000,000 test, so assets the S corporation keeps count too (section 1202(d)(3)).

What changes on our state returns?

Each state follows its own rules; check every state where the company files.

• California: ending the federal election ends the California election at the same time, and short-period Form 100S and Form 100 follow (Form 100S booklet). The rate moves from 1.5% to 8.84% (FTB rates); the $800 minimum applies either way.
• New York: the New York S election ends the day the federal one does. Report it on Form CT-6.1, then file CT-3-S for the S short year and CT-3 for the C short year, with the same due date (CT-3-S instructions).

A state pass-through entity tax election can cover only the S period.

Can we go back to S corporation status later?

Not soon. Without IRS consent, a corporation whose election ended can't elect again before its fifth tax year beginning after the first tax year the termination took effect (section 1362(g)). Even then, every shareholder must be eligible, which rules it out while a fund or a corporation holds shares. The reverse move is covered in switching a C corporation to an S corporation.

How does this compare with a Canadian startup?

What does this page leave to others?

• Charter amendments, preferred stock terms, the contribution agreement and securities law are legal work.
• Valuing the business for the contribution, and 409A valuations for options in the new company.
• Whether to take the money, and on what terms.
• Foreign-investment reviews and export controls on GPU access.

Example

All figures are in US dollars and illustrative.

Revoking before a $20,000,000 Series A

A Texas S corporation owned 50/50 by two US-citizen founders since 2021 runs GPU hosting and AI compute in a Dallas colocation data center. A fund's term sheet closes July 1, 2026. The founders file a revocation on June 15, effective July 1.

• S short year January 1 to June 30 (181 days); C short year July 1 to December 31 (184 days). With $3,650,000 of taxable income split by days ($10,000 a day), assuming the fund's new shares are not treated as a sale or exchange of half the stock, $1,810,000 goes on the 1120-S K-1s ($905,000 each) and $1,840,000 on Form 1120, with tax of $386,400 at 21%. Using actual books instead needs both founders' and the fund's consent.
• Both returns are due April 15, 2027, or October 15, 2027 with extensions.
• AAA is $2,500,000 at June 30. Cash paid by June 30, 2027 (or October 15, 2027 if the last 1120-S is extended) is tax free up to that AAA and each founder's stock basis. Paid in 2028, it is a dividend to the extent of C-year earnings.
• The founders' 2021 shares never qualify for QSBS; the fund's July 1 preferred can, if the tests are met. No new S election before 2031 without IRS consent.

Keeping the S corporation

Same company and round. On July 1 the S corporation contributes the hosting business (GPU fleet worth $30,000,000, other assets worth $5,000,000, total tax basis $1,000,000 after bonus depreciation) to a new Delaware corporation for all its common stock, and keeps no other assets. The fund pays $20,000,000 for preferred in the same deal, so section 351 applies.

• If the new company takes over an $8,000,000 GPU-backed loan, the S corporation has $7,000,000 of gain ($8,000,000 minus $1,000,000 basis): $3,500,000 on each founder's K-1, much or all of it ordinary income.
• Gross assets right after the round are $55,000,000 ($30,000,000 + $5,000,000 at value, plus $20,000,000 cash), under $75,000,000, so the new shares can qualify. At a $60,000,000 fleet value the total is $85,000,000 and none of that issuance qualifies. Only growth above the business's July 1 value can be excluded, and only for the two founders, through the S corporation.
• The S election continues: no split year, no transition-period deadline, no five-year clock. The S corporation files Form 1120-S with the section 351 statement; the new company files Form 1120.

A strategic investor abroad

A server maker in Taiwan pays $10,000,000 for 25% of the S corporation's common stock on September 1, 2026, with no preferred stock. The election ends September 1, because a corporation can't be a shareholder; it would end the same way if a founder's relative living in Singapore (a nonresident alien) bought shares. As a C corporation 25% owned by one foreign person, the company files Form 5472 with its Form 1120 for each year it has reportable transactions with the investor, such as buying servers from it or borrowing from it, and the company must withhold US tax from dividends paid to the investor; if it doesn't, the company owes that tax itself (section 1461).

Different for you?

• Preferred stock, a side agreement or an accidental ending: see how S corporations are taxed.
• The QSBS tests for a GPU rental business: see the small business stock exclusion for startups.
• Not yet an S corporation: see should you elect S corporation status.
• A founder moving abroad, or a spouse abroad sharing the shares: see how S corporations are taxed and US S corporation owner in Canada.
• Moving to Delaware before the round: see moving your company to another state.
• Cash or accrual after the switch: see switching from cash to accrual accounting.
• Missed filings the fund's diligence will find: see tax clean-up before investor due diligence.
• SAFEs or notes issued by the new C corporation: see SAFEs and convertible notes.
• A foreign investor owning 25% or more: see foreign-owned C corporation filing and company with a foreign co-owner.
• Dividends or interest paid to an investor abroad: see missed withholding on payments abroad.
• A Canadian startup taking US venture money: see losing CCPC status to foreign investors.
• Choosing a route, pricing the debt-above-basis gain or timing the revocation around a closing: see data center tax services.