Introduction
Schedule K-1 (Form 1120-S) is how an S corporation tells each shareholder, and the IRS, what share of income, deductions and credits belongs to them. Getting it right depends on a complete Form 1120-S and Schedule K.
Shareholders and preparers often struggle with:
- Confusing K-1 boxes and codes
- Mixing wages with pass-through income and distributions
- Tracking stock and debt basis
- Hitting the right filing deadline
- Handling Australian connections alongside US reporting
"2026" is ambiguous. A tax-year 2025 return is filed in 2026, while a tax-year 2026 return is generally filed in 2027. This guide covers both, and you should check every rule against the latest IRS forms before filing.
Key Takeaways
- Form 1120-S is the corporate return; each K-1 reports one shareholder's share.
- Every K-1 must reconcile to Schedule K and the ownership records.
- Wages, K-1 income, distributions and loans are taxed differently.
- Australian owners must confirm S-corporation eligibility before filing or accepting a K-1.
What Is Schedule K-1 (Form 1120-S)?
The corporation files Form 1120-S. Schedule K summarises all pass-through items, and a separate K-1 shows each shareholder's slice. The corporation gives the shareholder a copy and files copies with the IRS.
Shareholders generally do not attach the K-1 to their return. They keep it and use it to complete their own forms. The exception is backup withholding reported in box 13, code O.
Who receives a K-1
Generally, everyone who was a shareholder at any time during the year gets one. That includes shareholders who sold mid-year.
When the corporation files a final return, it checks both the final-return box and the Final K-1 box. Zero income or a loss does not remove the requirement, since loss deductibility is limited separately at shareholder level.
S-corporation eligibility for Australian-connected owners
Eligibility comes before reporting. Under IRC section 1361, a nonresident alien cannot be a direct shareholder. An Australian address alone does not settle the question.
- Eligible: US citizens and resident individuals, certain estates and trusts (grantor trusts, QSSTs, ESBTs), and specified exempt organisations
- Generally ineligible: partnerships, corporations and foreign entities
- Other limits: a domestic corporation, no more than 100 shareholders, one class of stock
An ineligible shareholder terminates the S election from that date. Relief is possible but not automatic. In one 2026 private letter ruling, moving shares to five trusts without ESBT elections ended the election. The IRS treated it as inadvertent, but only for that taxpayer.
Whether an eligible shareholder must also report US income in Australia is a separate question. Where residency, citizenship, treaty or entity classification is unclear, get cross-border advice first.
How to Complete Schedule K-1 (Form 1120-S)
Gather these preparation materials first:
- Current-year Form 1120-S and Schedule K, plus the prior-year return
- Accepted S-election information
- Shareholder register, ownership changes, TINs, addresses and share counts
- Payroll records, shareholder loans, distributions and supporting statements
Part I: Information about the corporation
Copy the legal name, address, EIN and IRS filing centre from Form 1120-S, plus total shares at the start and end of the year. These must match the return. A wrong EIN or name triggers notices and stops shareholders from reconciling their personal returns.
Part II: Information about the shareholder
Enter the shareholder's name, address and TIN, the entity type, the current-year ownership percentage, beginning and ending shares, and beginning and ending loans.
Items are allocated per share, per day by default. A shareholder who disposes of shares is treated as owning them on the disposal date. When a shareholder's entire interest ends, the corporation and all affected shareholders may elect under section 1377(a)(2) to split the year in two. That election requires a statement attached to the return.
Part III: Shareholder's share of income, deductions, credits and other items
Part III holds the coded items flowing from Schedule K. Many boxes will be blank. Use the current IRS instructions for labels, codes and attachments.
- Boxes 1-10: business and rental income, interest, dividends, royalties, capital gains, section 1231 gains, other income
- Boxes 11-19: section 179, other deductions, credits, K-3 indicator, AMT, basis items, other information, at-risk and passive indicators
- Codes appear in boxes 10, 12, 13 and 15-17
Reconcile the K-1 totals to Schedule K, the books and tax workpapers, ownership records, and any attached statements or Schedules K-2 and K-3.
Worked illustration (hypothetical figures)
Suppose Schedule K shows ordinary income of $200,000 and a shareholder owned 25% for the whole year. Box 1 on that shareholder's K-1 shows $50,000. If the shareholder held 25% for half the year, the per-day rule gives roughly $25,000 from that stake. This is illustrative only, not tax advice.
How to Interpret and Report K-1 Items
Ordinary income, losses and other items
Not every amount is ordinary income. Box 1 nonpassive income goes to Schedule E, line 28. Passive items follow passive-activity rules.
| K-1 item | Where it generally goes |
|---|---|
| Boxes 4 and 5 | Form 1040 lines 2b, 3a, 3b |
| Boxes 7 and 8a | Schedule D |
| Box 9 | Form 4797 (passive losses via Form 8582) |
| Box 11 | Form 4562 |
| Box 13 | Form 3800 or specific credit forms |
| Box 17, code V | Form 8995 or 8995-A |
Confirm current line references in the IRS instructions.
Wages, K-1 income and distributions are different
Shareholder-employee wages come through payroll and Form W-2. K-1 income is the allocated share of corporate items. The IRS expects reasonable compensation before non-wage distributions and may reclassify distributions as wages.
Distributions appear on the K-1 but are not extra income. Their tax depends on basis. Without accumulated earnings and profits, distributions are tax-free up to stock basis, and any excess is treated as sale or exchange gain.
Basis, shareholder loans and loss limitations
Shareholders must compute stock and debt basis every year. The K-1 does not do it for you. Track contributions, income, losses, distributions, loans and repayments.
Form 7203 is required when you claim an aggregate loss deduction, receive a nondividend distribution, dispose of stock or receive a loan repayment.
Losses then pass through four limits in order:
- Basis (Form 7203)
- At-risk (Form 6198)
- Passive activity (Form 8582)
- Excess business loss (Form 461)
Passive activity and Section 199A
The K-1 alone doesn't tell you whether a loss is deductible now. Material participation and personal-return limits matter.
For section 199A, K-1 code V supplies the data. Thresholds apply to the shareholder's taxable income before the deduction:
| Tax year | Joint | Other returns |
|---|---|---|
| 2025 | $394,600 | $197,300 |
| 2026 | $403,500 | $201,750 |
These are US dollar figures from the IRS. S-corporation reasonable compensation is excluded from QBI.
Foreign transactions and supplemental information
K-2 extends Schedule K and K-3 extends the K-1 where international provisions affect shareholders. Small corporations (receipts and year-end assets both under US$250,000) have an exception, but notification and request rules still apply.
Australian-connected shareholders should keep records of foreign income, withholding, treaty positions and foreign tax credits. US treatment does not automatically carry over for Australian purposes.
2026 Deadlines, Records and Australian Cross-Border Issues
The correct filing timeline
| Item | Tax year 2025 (filed 2026) | Tax year 2026 (filed 2027) |
|---|---|---|
| Calendar-year Form 1120-S | 16 March 2026 | 15 March 2027 |
| Late return penalty | US$255 per shareholder per month | US$260 |
| Late or incorrect K-1 | US$340 per K-1 | US$340 |
The rule is the 15th day of the third month after year-end, adjusted for weekends and holidays. K-1s are due by the return's due date, including valid extensions. Fiscal-year and short-period returns follow the same rule from their own year-end.
Extensions and late K-1s
Form 7004 generally gives an automatic six-month extension, filed by the original deadline. It does not extend time to pay tax. A late corporate return delays shareholders' filings.
If your K-1 is late:
- Contact the corporation for a date.
- Estimate only where appropriate.
- Consider an individual extension.
- Pay what you owe on time.
- Amend if final figures differ.
Records to keep
- Final Form 1120-S, Schedule K, trial balance and general ledger
- Payroll records, shareholder register and ownership-change documents
- Basis schedules, distributions, loans and foreign transaction records
- Copies of delivered K-1s, allocation methods and corrected K-1s
Keep general tax records for 3 years, or 6 years if over 25% of income was omitted, and at least 4 years for employment tax. Keep basis records longer.
Australian shareholder and residency considerations
Holding S-corporation shares depends on US eligibility rules and individual facts: citizenship, US tax residency, entity type and trust status. US citizens abroad use Form W-9, not W-8BEN.
On the Australian side, the ATO allows a foreign income tax offset only where foreign tax was actually paid or deemed paid and the income is included in Australian income. A K-1 alone does not prove entitlement.
The US-Australia treaty has a saving clause, so it is not an unconditional exemption. Confirm S corporation treatment with your Australian tax adviser, as the ATO has not issued a blanket classification.
Federal, state, payroll and international compliance
Federal K-1s do not cover state, payroll or Australian obligations. Corporations filing 10 or more returns of any type generally must e-file. Payroll runs through Form 941 and W-2.
Professional review matters most when you have:
- Multiple states or non-US shareholders
- Related-party dealings or shareholder loans
- Ownership transfers, asset sales or large losses
- Incomplete prior filings
Final Checklist and Next Steps
Pre-submission checklist
- Correct tax year and valid S election
- Corporation and shareholder identifiers
- Ownership percentages and share counts
- Schedule K reconciliation and coded items
- Basis information and distributions
- Required statements and signatures
- Filing method and delivery of every K-1
Common mistakes to avoid
- Using the wrong year's form
- Confusing Form 1120-S with Schedule K-1
- Omitting a shareholder or copying percentages wrongly
- Treating distributions as wages or extra income
- Ignoring basis limits
- Leaving out foreign information
- Assuming Form 7004 extends payment
When professional support helps
Australian-based owners often need S-corporation preparation, K-1 reconciliation, payroll and basis review, and cross-border coordination together. VJM Global supports Australian businesses on US S-corporation and K-1 compliance through a team of CPAs and Chartered Accountants, and has served 250+ Australian businesses. Contact [email protected] to request a tailored compliance review.
Treatment depends on the election, shareholder status, ownership history, activity, tax year and cross-border facts. Confirm current IRS and ATO requirements with a qualified tax professional.
Frequently Asked Questions
What is Schedule K-1 (Form 1120-S)?
It reports an S corporation shareholder's share of income, deductions, credits, losses and other items. The shareholder uses it to complete their own return.
Who prepares and receives a Schedule K-1 (Form 1120-S)?
The S corporation prepares a separate K-1 for each shareholder. Generally, anyone who held shares at any point in the year receives one.
When is Schedule K-1 (Form 1120-S) due in 2026?
Calendar-year S corporations must issue K-1s by the Form 1120-S due date: 16 March 2026 for tax year 2025, or any extended due date. Tax year 2026 returns and K-1s are due 15 March 2027. Confirm dates on current IRS guidance.
How do I report information from an S corporation K-1 on my tax return?
Items flow to different forms: Schedule E, Schedule D, Form 4797, credit forms and basis schedules. Follow the current shareholder instructions.
Are S corporation distributions shown on a K-1 taxable?
Not necessarily. Distributions are generally tax-free up to stock basis, and any excess is treated as gain. Income is taxable even if you receive no cash.
Can an Australian resident hold shares in a US S corporation?
Only if they qualify as an eligible shareholder, which a nonresident alien does not. Eligibility depends on citizenship or US residency and entity structure. Take US and Australian advice before relying on the election.
