How does the closing-of-books election affect the S-corporation's accumulated adjustments account under IRC 1368?

Under the PSPD default, the AAA is computed for the full tax year and distributions are tested against the year-end AAA balance. When the closing-of-books election is in effect, the AAA is effectively split at the termination date. Distributions made to the selling shareholder before the closing date reduce AAA computed through that date only. Distributions to continuing and purchasing shareholders after the closing date reduce AAA computed for the second short-year period. This prevents a distributing S-corporation from inadvertently shifting the AAA benefit between the selling and purchasing shareholders through the timing of distributions taken near the closing date. The AAA ordering rules under IRC 1368(d) apply within each short-year period separately. Practitioners handling distributions made in the weeks surrounding a mid-year stock transfer should model the AAA impact under both methods to determine whether the closing-of-books election produces a more favorable outcome for their clients.

IRC 1377: S-Corp Closing of Books Election

Q: What is the IRC 1377 default per-share per-day rule and how is it calculated?

Under IRC 1377(a)(1), each S-corporation item of income, loss, deduction, and credit is allocated among shareholders on a per-share per-day (PSPD) basis. The mechanics: first, divide each annual item by the number of days in the S-corporation's tax year; second, multiply the resulting daily amount by the number of shares outstanding on each day; third, allocate each day's result to the shareholders who owned stock on that day. A shareholder who held 100 shares from January 1 through June 30 of a 365-day calendar year owns stock on 181 days. If the corporation earned $365,000 of ordinary income for the full year, the daily rate is $1,000 per day. The selling shareholder's allocable share is 181 days times 100 shares (assuming the same number of shares are outstanding throughout). This ratable spread applies regardless of when during the year the corporation actually earned the income or incurred the loss. No closing of books occurs under the default -- the IRS treats income as if it accrued uniformly across every calendar day.

Q: What happens if the closing-of-books election window is missed?

If the S-corporation fails to make the IRC 1377(a)(2) election on a timely filed return (including extensions) for the tax year in which the termination occurred, the corporation is permanently locked into the per-share per-day allocation method for that year. There is no late election available as a matter of right, and no Revenue Procedure provides for a simple extension of the election window for an ordinary missed deadline. A taxpayer could potentially seek relief under Treas. Reg. 301.9100, which allows the IRS to grant extensions for regulatory elections missed due to reasonable cause, but 9100 relief is not guaranteed and requires a ruling request. Practitioners should build a workflow checklist that identifies a mid-year stock transfer immediately upon closing and flags the election requirement before the return due date. Waiting until year-end to discover the transfer has occurred creates significant risk of missing the window.

Q: How does the closing-of-books election affect IRC 1367 basis adjustments for the selling shareholder?

When the closing-of-books election is in effect, the selling shareholder's final basis computation uses only the items allocated to the first short year -- the period ending on the date of the stock disposition. Upward adjustments for income and downward adjustments for losses and distributions are limited to what was actually allocated through the closing date, rather than a ratable share of the full year. This is a critical distinction in a year where large income or losses are non-ratable (for example, a large gain recognized in the first half of the year that the PSPD method would spread across the full year). The closing-of-books election captures that first-half gain in the selling shareholder's final basis computation, which affects their gain or loss on the stock sale itself. Practitioners must compute the selling shareholder's adjusted basis as of the closing date before computing gain or loss on the sale. Consult IRC 1367 and Treas. Reg. 1.1367-1 together with the closing-of-books election framework and verify the interaction with qualified tax counsel.

Q: How does the closing-of-books election interact with the IRC 1374 built-in gains tax?

The IRC 1374 built-in gains tax is assessed at the corporate level on net recognized built-in gain during the recognition period. When a mid-year stock sale triggers a closing-of-books election, the election divides the tax year into two short years for allocation purposes. BIG income recognized before the closing date is allocated entirely to the first short-year period and flows through to the selling shareholder's Schedule K-1. Income recognized after the closing date flows through on the purchasing shareholder's K-1. The BIG tax itself is a separately stated item that is allocated under the same PSPD or closing-of-books framework. If BIG recognition is concentrated in one half of the year, the election can materially shift which shareholder bears the economic burden of the corporate-level tax passthrough. Practitioners advising on a sale during a BIG recognition period should model both methods before making or declining the election. Verify current recognition period rules and BIG tax mechanics with IRS.gov.

Q: What are the Schedule K-1 reporting requirements when a closing-of-books election is in effect for a split year?

When a closing-of-books election is made, the S-corporation must issue two Schedule K-1s to the selling shareholder: one covering the period from the beginning of the tax year through the date of termination (the first short year), and one to the purchasing shareholder (or other new shareholder) covering the period from the day after the closing date through year-end (the second short year). The K-1 for the first period carries the selling shareholder's pro-rata share of all items allocated through the closing date, computed on an actual closing-of-books basis rather than a PSPD fraction. The K-1 for the second period carries the continuing and purchasing shareholder allocations for the remainder of the year. Both K-1s are filed as part of a single Form 1120-S return for the full tax year -- the election does not create two separate S-corporation returns. Practitioners should note in the K-1 instructions box that a closing-of-books election was made for the year and identify the closing date. Confirm current K-1 reporting instructions with the IRS Form 1120-S instructions and IRS.gov.

1. The IRC 1377 Default: Per-Share Per-Day Allocation

IRC 1377(a)(1) establishes the default allocation rule for S-corporation items. Every item of income, loss, deduction, and credit is allocated among shareholders on a per-share per-day (PSPD) basis. The statute treats the tax year as a uniform series of daily slices: each day carries an equal fraction of the annual amount, and that fraction is then apportioned among the shares outstanding on that day.

The mechanics, step by step:

Divide the annual amount of each item by the number of days in the S-corporation's tax year.
For each day, multiply the resulting per-day amount by the number of shares outstanding on that day.
Allocate each day's result to the shareholder(s) who held each share on that day.

The PSPD rule applies to all S-corporation items -- ordinary income, ordinary loss, capital gains, IRC 1231 gains and losses, separately stated deductions, credits, and tax-preference items. It does not attempt to match income recognition to the period in which the income was economically earned. A corporation that closes a large commercial real estate sale on December 28 allocates that gain across all 365 days of the year under PSPD, even though the selling shareholder who disposed of stock in February had no involvement in the transaction.

Planning Note: PSPD Blindness to Economic Timing

PSPD is deterministic and requires no election, but it is economically arbitrary when an S-corporation's income or loss is heavily front-loaded or back-loaded. A shareholder who held stock for only 30 days in January receives a ratable slice of a December windfall. Conversely, a shareholder who sold in June bears a ratable share of a third-quarter loss the corporation incurred after the sale. Practitioners should model PSPD alongside the closing-of-books alternative before advising a client on whether to pursue or consent to the IRC 1377(a)(2) election.

2. IRC 1377(a)(2): The Terminating-Year Closing-of-Books Election

Triggering Events

The closing-of-books election under IRC 1377(a)(2) is available only when one of two triggering events occurs during the tax year:

Complete termination of a shareholder's interest. A shareholder disposes of all of their S-corporation shares during the year, whether by sale, gift, death, or redemption. A partial transfer -- such as a shareholder selling half of their shares while retaining the other half -- does not qualify under this prong.
Qualifying disposition. One or more shareholders dispose of 50 percent or more of the outstanding S-corporation stock within any period of 30 consecutive days during the tax year. This threshold is assessed on the aggregate shares transferred within the 30-day window, not on any single shareholder's individual transfer.

Effect of the Election

When the election is properly made, the S-corporation's tax year is treated as two separate short tax years for purposes of allocating items among affected shareholders:

First short year: The period from the first day of the tax year through the date of the termination or qualifying disposition.
Second short year: The period from the day after the closing date through the last day of the tax year.

Items of income, loss, deduction, and credit are allocated to each short year based on actual results -- the corporation's books are examined to determine what income accrued, what expenses were incurred, and what gains or losses were realized in each period. The selling shareholder receives a Schedule K-1 reflecting only the items allocated through the closing date. The purchasing shareholder receives a K-1 covering only the post-closing period.

Critically, the election does not create two separate S-corporation tax returns. The corporation files a single Form 1120-S for the full tax year. The closing-of-books election governs how items within that single return are allocated to affected shareholders.

Consent Requirement

Under Treas. Reg. 1.1377-1(b)(3), the election requires the written consent of every shareholder who held stock at any time during the tax year on or before the closing date and every person who held stock as of the first day of the second short year. In practice, this means the selling shareholder, the purchasing shareholder, and all continuing shareholders must all consent. No shareholder's consent can be withheld to force a different outcome -- if any affected shareholder refuses, the election cannot be made and PSPD applies.

Critical Deadline: Election Window Is the Return Due Date

The closing-of-books election must be made on the S-corporation's timely filed return (Form 1120-S) for the tax year in which the triggering event occurred, including any extensions. There is no late-filing procedure available as a matter of right. If the election is not made by the return due date, the corporation is permanently locked into per-share per-day allocation for that year. Practitioners must identify mid-year stock transfers at the time they occur and flag the election decision immediately -- not at year-end when the return is being prepared.

3. Pro-Rata vs. Closing of Books: Worked Example

Illustrative Example (All Figures Hypothetical)

Facts: Archer Manufacturing, Inc. is a calendar-year S-corporation with two equal shareholders: Natalie (50%) and Marcus (50%), each holding 500 of 1,000 total shares. On June 30, Natalie sells all 500 of her shares to Patricia. The sale closes on June 30, which is the 181st day of a 365-day year.

During the full year, the S-corporation has the following items:

Ordinary income (January 1 through June 30, first half): $200,000
Ordinary loss (July 1 through December 31, second half): ($80,000)
Long-term capital gain (recognized December 15): $100,000
Full-year net ordinary income: $120,000 ($200,000 minus $80,000)

Under PSPD: Natalie's share of each item is calculated on a per-share per-day basis for the 181 days she held stock, divided by 365 total days, applied to 50% of shares. Her allocable fraction for the period she held stock is approximately 181/365 = 49.59% of 50% interest = 24.79% of the corporation's total.

Natalie's ordinary income (PSPD): $120,000 x 24.79% = approximately $29,753
Natalie's capital gain (PSPD): $100,000 x 24.79% = approximately $24,795

Under Closing of Books: The books close on June 30. Items allocated to the first short year (January 1 through June 30) are based on actual results: $200,000 ordinary income and $0 capital gain (the gain was recognized December 15). Natalie's K-1 for the first period reflects 50% of first-period items only.

Natalie's ordinary income (closing of books): $200,000 x 50% = $100,000
Natalie's capital gain (closing of books): $0 (recognized in second short year)

Significance: Under PSPD, Natalie's ordinary income is approximately $29,753 -- a ratable slice of the full-year net. Under closing of books, Natalie's ordinary income is $100,000, reflecting the actual first-half profitability. Conversely, Natalie avoids the second-half ordinary loss and the December capital gain entirely. The result that is more favorable depends on each party's individual tax position, capital loss carryovers, and basis.

When Practitioners Prefer Each Method

The closing-of-books election is typically preferred when:

The corporation's income or loss is concentrated in one half of the year and the allocation under PSPD would be economically distorted.
A large, identifiable item (an asset sale, a litigation settlement, a BIG disposition) is recognized in either the pre- or post-transfer period, and one party has a strong interest in capturing or excluding that item.
The selling shareholder has suspended losses or basis constraints that would be affected by the actual first-half items.

PSPD is typically retained (and the election not made) when:

The corporation's income is steady and roughly uniform across the year, making PSPD and closing of books produce similar results.
One or more affected shareholders decline to consent (making the election unavailable regardless of preference).
The administrative burden of a mid-year closing of books exceeds the tax benefit of the election for all parties.

4. Interaction with IRC 1366 and IRC 1367

Passthrough of Items Under IRC 1366

IRC 1366(a) requires each shareholder to take into account their pro-rata share of S-corporation income, loss, deduction, and credit. When a closing-of-books election is in effect, the selling shareholder's "pro-rata share" for purposes of IRC 1366 is defined by the items allocated to the first short year -- computed on an actual basis, not a ratable daily fraction. The purchasing shareholder's IRC 1366 income and loss items are limited to the second short year. Both separately stated and non-separately stated items are allocated independently within each period.

IRC 1367 Basis Adjustment Timing

The closing-of-books election has a direct consequence on the selling shareholder's final basis computation under IRC 1367. Basis adjustments under IRC 1367(a)(1) (upward for income items) and IRC 1367(a)(2) (downward for losses, deductions, and non-deductible expenses) are made as of the last day of the taxable year in the ordinary case. However, when a shareholder disposes of stock during the year, the final basis as of the date of disposition -- not year-end -- determines the gain or loss on the sale.

Under the closing-of-books election, the selling shareholder's final basis reflects only the items from the first short year. This means a large gain recognized in the first half increases the seller's basis before the sale is priced, potentially reducing the gain on the stock itself. Conversely, a large first-half loss decreases basis, potentially increasing the gain on the sale or converting it from gain to loss.

Basis Trap: The Selling Shareholder's Final-Day Basis

Practitioners frequently miscalculate the selling shareholder's gain or loss by using beginning-of-year basis without adjusting for items allocated through the closing date. Under the closing-of-books election, the Reg. 1.1367-1(f) ordering rules apply within the first short year: distributions reduce basis first, then non-separately stated losses, then separately stated losses, then non-deductible expenses. All four steps must be completed before the basis as of the closing date is determined and the gain or loss on the sale is computed.

5. Interaction with IRC 1374 Built-in Gains Tax

The IRC 1374 built-in gains tax is a corporate-level tax imposed on the S-corporation's net recognized built-in gain during the recognition period following a C-to-S conversion. The BIG tax is a separately stated item under IRC 1366(a)(1)(A) that flows through to shareholders in proportion to their allocated shares. When a mid-year stock sale triggers a closing-of-books election, the BIG tax allocation follows the same framework.

BIG income recognized before the closing date is allocated entirely to the first short year under the closing-of-books method. If the corporation disposes of a built-in gain asset in March and the selling shareholder closes on June 30, the selling shareholder's K-1 for the first period includes their share of that BIG income -- and their share of the corporate-level BIG tax that reduces the net BIG passthrough. Income recognized after the closing date, including BIG income from assets sold in the second half of the year, flows through to the purchasing and continuing shareholders.

Alert: BIG Tax Shifts Between Seller and Buyer Under Each Method

Under PSPD, the BIG tax and the related income are spread ratably across the year and shared between the selling and purchasing shareholders in proportion to their respective holding periods. Under closing of books, a BIG transaction recognized entirely in the pre-closing period falls entirely on the selling shareholder's K-1, even if the transaction was negotiated and finalized by the seller. Conversely, a BIG disposition completed after the closing date falls entirely on the purchasing shareholder. Practitioners must map each BIG asset's anticipated recognition date against the closing date before advising on the election.

6. AAA and IRC 1368 Distributions

The S-corporation's accumulated adjustments account (AAA) under IRC 1368(e) is the scoreboard that determines whether distributions to shareholders come out tax-free (to the extent of basis and AAA) or as dividend income (to the extent of accumulated earnings and profits, if any). The timing of distributions relative to a mid-year stock sale creates planning opportunities and traps that the closing-of-books election can address.

Under the PSPD default, AAA is computed for the full tax year. Distributions are tested against the year-end AAA balance under IRC 1368(d). The ordering of income and distributions within the year is not formally segregated to periods, which can produce unintended results when a large distribution is made to the selling shareholder before the sale closes and a large AAA reduction (from a second-half loss) occurs afterward.

When the closing-of-books election is in effect, the AAA is effectively tested separately within each short-year period. Distributions made to the selling shareholder during the first short year reduce the first-period AAA. Distributions made to the continuing and purchasing shareholders in the second short year reduce the second-period AAA. This prevents a distribution taken by the seller from being offset against income earned in the second period that the seller had no economic interest in.

AAA Planning: Distributions Near the Closing Date

When a distribution is made to the selling shareholder in the days or weeks before the stock sale closes, the treatment of that distribution under PSPD versus closing of books can differ materially. Under PSPD, the full-year AAA (including income allocated to the second half, in which the seller had no interest) is available to support the distribution as a tax-free return of basis. Under closing of books, only the first-period AAA is tested. Practitioners structuring pre-closing distributions should model both treatments to determine whether the AAA is sufficient in the first period alone and whether a different distribution timing would produce a better result for the client.

7. IRC 1375 Passive Investment Income Tax

IRC 1375 imposes a tax at the highest corporate rate on an S-corporation's excess net passive income when the corporation has accumulated earnings and profits (AE&P) from prior C-corporation years and passive investment income exceeds 25 percent of gross receipts. The passive investment income tax is computed at the corporate level and is also a separately stated item that flows through to shareholders.

The PSPD versus closing-of-books choice affects the computation in two ways. First, if the short-year period under closing of books changes the ratio of passive income to gross receipts for the period (because passive income or gross receipts are concentrated in one short year), it can affect whether the 25-percent threshold is met for any short year and therefore whether the tax applies at all. Second, the IRC 1375 tax that is computed and passes through to shareholders is allocated under the same PSPD or closing-of-books framework as all other separately stated items. Practitioners advising S-corporations with AE&P and significant passive income should review how the election affects the IRC 1375 exposure for each shareholder.

8. Form 1120-S Schedule K-1 Reporting for Split Years

A closing-of-books election does not generate two Form 1120-S returns. The S-corporation files one return for the full tax year. What changes is the K-1 package:

Selling shareholder (Period 1 K-1): The S-corporation issues a Schedule K-1 covering the period from the first day of the tax year through the closing date. The K-1 reflects the selling shareholder's share of items allocated to the first short year under the closing-of-books method. Box 1 (ordinary income/loss), Box 2-12 (separately stated items), and all other applicable boxes reflect first-period amounts only.
Purchasing shareholder (Period 2 K-1): The S-corporation issues a Schedule K-1 covering the period from the day after the closing date through the last day of the tax year. The purchasing shareholder's K-1 reflects only second-period items.
Continuing shareholders: Continuing shareholders who held stock throughout the year receive two K-1s: one for the first short year and one for the second short year, both reflecting their share of items under the closing-of-books allocation.

Practitioners should attach a notation to each K-1 that identifies the closing-of-books election, states the closing date, and confirms that the K-1 covers a specific period rather than the full tax year. This prevents the recipient's tax preparer from applying a full-year basis to a partial-year K-1. IRS Form 1120-S Schedule K-1 instructions provide the current reporting framework -- verify with the most recent instructions at IRS.gov before filing.

Reference: IRS Resources for Closing-of-Books Elections

Primary authorities governing the closing-of-books election include: IRC 1377(a)(2); Treas. Reg. 1.1377-1(b) (election mechanics and consent); Treas. Reg. 1.1377-1(b)(3) (consent requirements); IRC 1366 and Treas. Reg. 1.1366-1 (passthrough of items); IRC 1367 and Treas. Reg. 1.1367-1(f) (basis adjustment ordering); IRC 1368 and Treas. Reg. 1.1368-1 (AAA and distributions); Form 1120-S Schedule K-1 and instructions. Current versions of all authorities are available at IRS.gov and in the Electronic Code of Federal Regulations.

9. Election Procedure, Filing Deadline, and Consequences of Missing the Window

Who Makes the Election

The S-corporation makes the closing-of-books election, not the individual shareholder. The election is attached to the S-corporation's Form 1120-S for the tax year in which the triggering event occurred. There is no standalone IRS form for the election. The attachment must:

Identify the election as one made under IRC 1377(a)(2).
State the name of the S-corporation, its EIN, and the tax year.
Identify the triggering event (complete termination or qualifying disposition) and its date.
Identify all affected shareholders (those required to consent).
State that each affected shareholder has consented to the election.

Identify the mid-year stock transfer as it occurs and notify the S-corporation's tax counsel immediately.
Determine whether the transfer constitutes a complete termination or a qualifying disposition under the applicable threshold tests.
Identify all affected shareholders and obtain written consent from each before the return is filed.
Perform a mid-year closing of the S-corporation's books to compute actual income, loss, deduction, and credit for the first and second periods.
Prepare separate K-1 allocations for each affected shareholder and period.
Attach the election statement to the timely filed Form 1120-S and retain consent documentation in the file.

Filing Deadline

The election must be made on the S-corporation's timely filed return for the tax year of the triggering event, including any extensions obtained under IRC 6081. A Form 1120-S that is not timely filed -- even if filed shortly after the due date -- may be treated as not timely for purposes of the election. Filing extensions protect the deadline; late filings do not.

Consequences of Missing the Election Window

If the election is not made on a timely filed return, the S-corporation is permanently required to use per-share per-day allocation for that tax year. There is no late election available as a matter of right. A taxpayer who missed the deadline due to reasonable cause may seek relief under Treas. Reg. 301.9100-3, but 9100 relief requires a private letter ruling request, is not guaranteed, is not available for elections that are wholly within the taxpayer's control, and involves significant professional time and IRS fees. The practical lesson: identify triggering events promptly and build the election decision into the engagement workflow, not the return-preparation workflow.

10. PSPD vs. Closing of Books: Comparison Table

The table below compares the two allocation methods across ten practitioner-relevant dimensions.

Dimension	Per-Share Per-Day (PSPD)	Closing of Books	Qualifying Disposition Trigger
Method Availability	Applies automatically as the IRC 1377(a)(1) default. No election required.	Available only when a shareholder terminates their entire interest, or a qualifying disposition of 50% or more of outstanding shares occurs within any 30-consecutive-day period.	Qualifying disposition (50%+ in 30 days) is a separate triggering event from a complete termination. Either event enables the IRC 1377(a)(2) election.
Who Must Consent	No consent required. Applies by operation of law.	All shareholders who held stock on or before the closing date and all shareholders as of the first day of the second short year must consent. Unanimous consent of all affected shareholders is required.	Same consent rule as for complete termination: all affected shareholders must consent. A single dissenting affected shareholder blocks the election.
Items Affected	All items: ordinary income and loss, separately stated items (capital gains, IRC 1231 items, charitable contributions, Section 179, credits), and non-deductible expenses.	Same items, but allocated based on actual closing-of-books results for each short-year period rather than a ratable daily fraction of the full-year total.	Same scope as closing of books in general. The qualifying disposition determines where the books close, but the item categories are unchanged.
Timing of Allocation	Ratable: each daily fraction is equal, regardless of when income was earned or losses were incurred. A December transaction is spread back across the full year.	Actual: items are allocated to the period in which they were actually earned, incurred, or recognized. A December transaction falls entirely in the second short year.	Same as closing of books. The 30-day window determines the cutting date, but allocation within each period is actual, not ratable.
Effect on BIG Recognition	BIG income and the IRC 1374 tax are spread ratably between the selling and purchasing shareholders in proportion to holding-period fractions.	BIG income recognized before the closing date falls entirely on the selling shareholder's K-1. BIG income recognized after the closing date falls on the purchasing and continuing shareholders.	Same as closing of books. BIG items follow the short-year allocation and are entirely assigned to whichever period they are recognized in.
AAA Allocation	AAA is computed for the full year. Distributions by the selling shareholder before the sale are tested against the full-year AAA balance.	AAA is effectively segregated by period. First-period distributions reduce first-period AAA; second-period distributions reduce second-period AAA.	Same as closing of books. AAA is allocated within each short year, preventing second-half income from supporting first-half distributions retroactively.
Schedule K-1 Treatment	One K-1 per shareholder covering the shareholder's holding period, with amounts reflecting the PSPD fraction of each full-year item.	Two K-1s for the selling shareholder: one for Period 1 (pre-closing) and one for the purchasing shareholder for Period 2. Continuing shareholders also receive two K-1s. One Form 1120-S is still filed for the full year.	Same K-1 structure as closing of books. Period 1 and Period 2 K-1s are issued to the affected shareholders within the single annual Form 1120-S return.
Election Deadline	No election. PSPD applies automatically if no closing-of-books election is made.	Election must be attached to the S-corporation's timely filed Form 1120-S, including extensions, for the tax year of the triggering event.	Same deadline as for complete-termination elections. The qualifying disposition triggers the same return-due-date requirement under IRC 1377(a)(2).
Revocability	Not applicable. PSPD is the default, not an election, so there is nothing to revoke.	The closing-of-books election is binding once made on a timely filed return. There is no published procedure for revoking or withdrawing the election after filing.	Same as closing of books in general. Once the election is filed and the return becomes final, the election is effective for that year.
Practical Default	PSPD is the practical default in most routine mid-year transfers, particularly where income is roughly uniform across the year and a formal book-closing would be administratively burdensome relative to the tax benefit.	Closing of books is preferred when income or loss is concentrated in one half of the year, when BIG assets are sold pre- or post-closing, or when large distributions near the closing date need period-specific AAA support.	The qualifying-disposition trigger expands access to the election beyond individual complete terminations. It is the relevant trigger when a control transaction shifts 50%+ of shares within a narrow window, even if no single shareholder terminates entirely.

Frequently Asked Questions

What is the IRC 1377 default per-share per-day rule and how is it calculated?

Under IRC 1377(a)(1), each S-corporation item is divided by the number of days in the tax year, and that daily amount is allocated to shareholders in proportion to shares held on each day. A shareholder who held 100 of 1,000 outstanding shares for 181 days of a 365-day year receives 181 divided by 365 times 10% (100 shares / 1,000 total) of each annual item. The rule applies to all items -- ordinary income, separately stated items, and non-deductible expenses -- and makes no adjustment for when the income was actually earned during the year.

When is the IRC 1377(a)(2) closing-of-books election available?

The election is available in two circumstances: a shareholder terminates their entire S-corporation interest during the year (complete termination, by sale, gift, death, or redemption), or a qualifying disposition of 50 percent or more of the outstanding S-corporation stock occurs within any 30-consecutive-day period during the year. A partial transfer -- selling some but not all shares -- does not qualify under the termination prong. The 50-percent qualifying-disposition prong aggregates all shares transferred within the 30-day window. Verify current standards with IRS.gov and qualified tax counsel.

Who must consent to the closing-of-books election and how is consent documented?

All shareholders who held stock during the tax year on or before the closing date, and all shareholders as of the first day of the second short year, must consent. This includes the selling shareholder, the purchasing shareholder, and any other continuing shareholders. Consent is documented by attaching a statement to the timely filed Form 1120-S. There is no IRS form for the consent itself. Practitioners should obtain written consent from each affected shareholder before filing and retain those consents in the engagement file.

What happens if the closing-of-books election window is missed?

If the election is not made on a timely filed Form 1120-S (including any extension), the S-corporation is permanently required to use per-share per-day allocation for that tax year. No late election is available as a matter of right. Taxpayers who missed the deadline due to reasonable cause may seek relief under Treas. Reg. 301.9100-3 through a private letter ruling request, but that relief is not guaranteed, is time-consuming, and involves significant professional fees. The practical answer is to identify mid-year transfers at closing, not at year-end.

How does the closing-of-books election affect IRC 1367 basis adjustments for the selling shareholder?

When closing of books applies, the selling shareholder's basis adjustments under IRC 1367 are computed using only the items allocated to the first short year -- not a ratable fraction of full-year items. The Reg. 1.1367-1(f) ordering rules (distributions first, then non-separately stated losses, then separately stated losses, then non-deductible expenses) apply within the first short year. The selling shareholder's adjusted basis as of the closing date, after those ordered adjustments, is the basis used to compute gain or loss on the stock sale. Practitioners must not use beginning-of-year basis without first completing the first-short-year adjustment sequence.

How does the closing-of-books election interact with the IRC 1374 built-in gains tax?

The IRC 1374 BIG tax is a separately stated item that flows through to shareholders. Under closing of books, BIG income recognized before the closing date is allocated entirely to the selling shareholder's first-period K-1, and BIG income recognized after the closing date is allocated to the second-period K-1 (purchasing and continuing shareholders). Under PSPD, both shareholders share the BIG income and the related corporate-level tax ratably in proportion to their respective holding-period fractions. Practitioners must map each BIG asset's anticipated sale date relative to the closing date and model both allocation methods before advising on the election.

How does the closing-of-books election affect the AAA and distributions under IRC 1368?

Under the closing-of-books election, distributions made to the selling shareholder in the first short-year period reduce AAA computed for that period only. The second-period AAA (funded by income earned after the closing date) is not available to support the selling shareholder's pre-closing distributions. Under PSPD, the full-year AAA is available to test all distributions. Practitioners must model the AAA balance within each period under closing of books and confirm that any pre-closing distribution has sufficient AAA support within the first period before recommending the election.

What are the Schedule K-1 reporting requirements when a closing-of-books election is in effect?

The S-corporation issues two sets of K-1s within a single Form 1120-S return: a Period 1 K-1 to the selling shareholder (covering the period through the closing date, reflecting actual first-short-year items) and a Period 2 K-1 to the purchasing shareholder (covering the post-closing period). Continuing shareholders also receive two K-1s, one for each period. Each K-1 should note that a closing-of-books election was made, identify the election date, and confirm that the K-1 covers only the specified period. Verify current K-1 reporting requirements with the IRS Form 1120-S instructions at IRS.gov.

Last reviewed: July 2026 | Americas Tax -- americastax.com | This guide is for informational purposes only and does not constitute legal or tax advice. Verify all citations with IRS.gov and applicable Treasury regulations before relying on any position described herein.