Key takeaways
- Tax returns are confidential under section 6103, so a third party generally does not get a copy of the Form 1120-S.
- For tax year 2026 the return is due March 15 of 2027, and Form 7004 can request an automatic 6-month extension.
- Schedule B question 11 decides whether Schedule L and Schedule M-1 can be skipped, so compute total receipts and year-end assets before answering it.
- Shareholder-employees must be paid reasonable compensation, and Form 1125-E is required when total receipts are $500,000 or more.
Who can see the return
The IRS instructions for Form 1120-S say that tax returns and return information are generally confidential, as required by section 6103. A lender, a buyer, a former spouse or a business partner who asks for the corporation's Form 1120-S is not entitled to it under that general rule. The exceptions are written in section 6103 itself, so an unusual request should go to the client's counsel before anyone releases anything.
What a shareholder receives in the ordinary course is a Schedule K-1 for that shareholder's share. The instructions require the corporation to provide each Schedule K-1 to each shareholder on or before the day the Form 1120-S is required to be filed.
When a third party asks, the client can be told this: "Section 6103 limits what the IRS can disclose. The corporation's Form 1120-S is the corporation's own document, so the corporation decides whether to share it. We can release it only with the client's written consent." Then ask the client what figure the third party needs, because that is the part the corporation can decide to share.
Deadlines and the extension
For calendar-year corporations, the instructions give the due date as March 15. For the 2025 return that date was March 16, 2026, because March 15 fell on a Sunday. For the 2026 return the due date is March 15 of 2027. Check the weekday before you give a client a date, because a Saturday or Sunday moves it.
Form 7004 is the extension request. The IRS describes it as a way to request an automatic 6-month extension of time to file certain business income tax, information and other returns. The instructions say the corporation generally must file Form 7004 by the regular due date of the return. For a 2026 return the extended deadline falls in September 2027.
The common failure is an extended return with nothing sent to the shareholders. The Schedule K-1 date follows the return's required filing date, but shareholders still need their K-1s to file their own returns. Ask the client in writing whether any shareholder needs the K-1 before the extended date, and put that date on the calendar.
Schedule B question 11 and the balance sheet
Schedule B question 11 is the test that decides whether the corporation must complete Schedule L and Schedule M-1. The instructions say Schedule L is not required to be completed if the corporation answered Yes to question 11, and Schedule M-1 is not required on the same condition. The answer depends on total receipts and total assets at year end, so both numbers have to be pulled before the question is answered.
The instructions define total receipts as the sum of specific amounts: gross receipts or sales on page 1, line 1a; other income on page 1, lines 4 and 5; certain Schedule K items; and certain Form 8825 items. Pull those figures from the revenue ledger and the trial balance, not from bank deposits. Deposits include loan proceeds, owner contributions and transfers between accounts, and none of those are receipts.
Decision rule: if the client's total receipts or year-end assets are near the threshold, compute both and save the calculation in the file. Use the dollar figure printed in question 11 of the form for the year being filed, not a figure from last year's workpapers. If the test is not met, complete Schedule L from the year-end books and use Schedule M-1 to reconcile book income to tax income.
Schedule M-2 is a separate analysis schedule. It tracks several equity accounts, including the Analysis of Accumulated Adjustments Account. The instructions recommend that the AAA be maintained by all S corporations, so keep the AAA roll-forward current even in a year when the balance sheet is skipped. Schedule M-3 applies to corporations with total assets of $10 million or more on the last day of the tax year, so a corporation near that figure needs its book-tax reconciliation built on the M-3 format.
Officer pay and reasonable compensation
The line 7 instructions say that distributions and other payments to a corporate officer must be treated as wages to the extent the amounts are reasonable compensation for services rendered. For the shareholder who runs the firm, that means the pay is set and documented before the money moves, and distributions do not replace it.
Form 1125-E, Compensation of Officers, is required when total receipts are $500,000 or more, using the same total receipts definition described above. Below that figure the line 7 amount still needs support in the file, because the officer pay rule applies at every receipts level.
Decision rule: if the shareholder does work a hired employee would do, document the pay in the file. Record the duties, the hours per week, and the pay an outside hire would get for that role. A distribution-only year with strong profit is the case that draws attention, because the return then shows the officer's work with no wage line. The fix is a payroll run during the year, not a correction after the K-1s go out.
Schedule K and the K-1s
Schedule K is the corporation-level summary of items that pass through to shareholders. Each Schedule K-1 shows one shareholder's share of those items, and the K-1 boxes use codes for entries such as box 13, 15, 16 and 17. Keep the ownership percentage and the code list in the same file, so every K-1 ties back to the Schedule K totals.
Shareholder loans need a reconciliation. The instructions say the amount of loans from shareholders on Schedule L, line 19, should generally reconcile to the amounts on the K-1s. A difference usually means a loan was booked as a distribution, or a repayment was recorded in the ledger but not on the K-1.
If a shareholder's percentage changed during the year, do not apply the year-end percentage to the whole year. Get the dates of the transfer, the stock transfer documents and the shareholder's basis at each date, and allocate the items the way the records support.
Document list for each section
Income: the revenue ledger by account, the sales or invoice report for the year, the page 1 line 1a total, other income for lines 4 and 5, and the rental records if Form 8825 applies.
Deductions and officer pay: the payroll register for each shareholder-employee by pay date, the expense ledger sorted by vendor, and the fixed-asset register with the depreciation schedule.
Balance sheet and Schedule L: the year-end trial balance, the total assets figure for question 11, and a list of loans to and from shareholders with the balance at year end and the date of each change.
Schedule M-1 and M-2: the book net income for the year, the list of book-tax differences such as meals, fines and depreciation differences, and the AAA roll-forward from the prior year's return. Ask for the prior year's Schedule M-2 first, because the opening AAA balance has to match it.
Shareholders and K-1s: the ownership percentage by shareholder at each date, distributions by date and shareholder, the basis schedule, and any stock transfer documents from the year.
Failure modes and fixes
Question 11 answered from last year: the prior return's answer is carried forward without a new calculation. Fix it by recomputing total receipts and year-end total assets from the current trial balance every year, and writing the result in the file.
K-1s issued after the return: the K-1 is prepared once the return is final, which leaves shareholders without the numbers they need. Fix it by setting the K-1 date as a dated task next to the return deadline, and telling the client in the engagement letter when the K-1s will go out.