S Corp Midyear Sale: Who Reports the Year's Profit?

Short answer: A stock sale does not automatically put preclosing profit on the seller and postclosing profit on the buyer. The default federal rule allocates each S corporation tax item by shares owned on each day of the year. If the transaction meets an election rule and the required owners consent, the corporation may instead allocate using separate pre- and post-transfer periods. Model both before the Form 1120-S and K-1s are filed.

For an owner negotiating a substantial business exit, the choice can move taxable income, stock basis, sale gain, and estimated-tax cash between parties even though the corporation's annual profit is unchanged. It cannot be settled by writing “buyer gets profits after closing” in the purchase agreement.

Book a Return Review Call

Start with the legal stock transfer, not the cash distribution

The IRS Form 1120-S instructions allocate income, gain, loss, deduction, and credit per share, per day by default. A seller is treated as a shareholder on the day of disposition. A buyer and seller can receive K-1 amounts different from their cash distributions or the earnings each believes they economically owned. Confirm the stock ledger, closing date, number of shares, and whether the deal was a direct stock purchase or a corporate redemption before doing the allocation.

For a multi-owner company, apply the ownership percentage on each day; do not simply split annual profit at the closing date. Separately stated gains, credits, and deductions need the same analysis. The corporation generally files one full-year Form 1120-S with K-1s for all shareholders, even when an election treats the year as two periods for allocation.

Two different paths to a closing-of-books result

Entire interest ends: If a shareholder disposes of all of their stock, Section 1377(a)(2) may allow the corporation to treat its year as two periods ending on the termination date. The corporation and all affected shareholders, including the seller, must consent. The election statement goes with a timely filed original or amended Form 1120-S and the affected K-1s are marked “Section 1377(a)(2) Election Made.” Keeping even a small stock interest means this particular entire-interest test is not met.

Qualifying disposition: A separate election under Treasury Regulation 1.1368-1(g)(2) may apply to a disposition of at least 20% of outstanding stock in a 30-day period, an exchange-treated redemption of at least 20%, or an issuance of new stock equal to at least 25% of the previously outstanding stock. The corporation must describe the transaction and obtain consent from every shareholder who held stock during the year. A 20% partial sale should be tested under this rule; it is not automatically an entire-interest termination. Both elections have detailed filing and allocation rules, so do not attach an election statement merely because the purchase agreement requests it. The IRS instructions' special-rules section describes both routes.

Worked example: a profitable company sold on July 1

Assume one seller owns 100% of a calendar-year S corporation until selling all the stock to one buyer on July 1, 2025. The company has $1,200,000 of ordinary income for the year, but its books show $900,000 through July 1 and $300,000 afterward. No other tax items are assumed. Under the default rule, the seller owns the stock for 182 days, including the disposition day, and the buyer owns it for 183 days. The seller's K-1 would show approximately $598,356 ($1,200,000 × 182/365), and the buyer's approximately $601,644. A valid and properly supported closing-of-books election could instead allocate $900,000 to the seller and $300,000 to the buyer. That is an approximately $301,644 shift in K-1 income, not a $301,644 tax saving.

The model needs real cutoff books. For example, an August customer payment may represent a preclosing receivable under the corporation's accounting method, and a deal-related bonus may belong in a different period from its payment date. If the $900,000 figure is just a management estimate, do not present it as a return-ready tax allocation.

Decision sequence before the return is signed

Verify ownership and deal form. Match the purchase agreement, stock ledger, funds flow, and effective transfer date. A company-funded owner buyout may not have the form the parties assumed.
Compute the default allocation. Prepare an ownership-by-day schedule for each share class and shareholder; identify material separately stated items.
Test election eligibility and consents. Determine whether there is a complete termination or a qualifying disposition, and whether the corporation can obtain the required signed consents and timely election statement.
Build a defensible period close. Reconcile receivables, payables, payroll, owner loans, distributions, asset sales, and adjusting entries under the corporation's tax accounting method.
Reconcile each owner's return. Compare K-1 income, seller stock basis and gain, buyer opening basis, distributions, estimated payments, and any state pass-through tax treatment. Have the agreement address who bears a tax/cash mismatch; the agreement does not override the federal allocation.

Documents to gather and failures to catch

Bring the signed stock purchase or redemption documents, capitalization table and stock ledger, closing statement and bank transfers, prior and draft Forms 1120-S and K-1, seller Form 7203 or basis workpaper, cutoff trial balances, major transaction invoices, distribution ledger, and any consent or election language. The IRS Form 7203 instructions explain shareholder stock/debt-basis tracking; they do not replace a sale-specific basis reconstruction.

Assuming cash equals income. A preclosing distribution does not itself determine who reports annual ordinary income.
Using the wrong election. A partial stock sale is not automatically a Section 1377 entire-interest termination; a redemption must be characterized before applying the qualifying-disposition test.
Ignoring consent and timing. An unsigned purchase-agreement promise is not the Form 1120-S election statement or every required shareholder consent.
Ignoring basis and gain. Moving income between K-1s can change the seller's stock basis and reported sale gain; it does not make the transaction tax-free.
Ignoring state consequences. State allocation or pass-through entity tax rules may require separate modeling.

This is a federal decision framework, not a recommended election for every sale. The best answer depends on the actual ownership change, tax-method cutoff, consents, purchase agreement, other shareholders, and state returns. If the Form 1120-S or personal returns were already filed, first compare what was filed with the transaction documents and corrected-K-1 procedure before deciding whether a correction is needed.

AE can review the ownership timeline, two allocation models, election requirements, basis workpapers, and draft K-1s together before the owners sign off on the return.