Introduction
If you run a US corporation from Australia, Form 1120 Schedule G is probably buried somewhere in your tax software checklist, flagged with a "check if applicable" tag nobody explains properly.
Schedule G is the IRS schedule that discloses specified owners connected to a corporation's voting stock. Getting it wrong usually traces back to treating the cap table as the whole answer.
This guide is written for US corporations, Australian-based founders and finance teams running US entities, foreign-owned companies, and advisers preparing Form 1120 for tax years beginning in 2026 and beyond.
Accuracy matters because Schedule G eligibility has to match your legal records, cap table, voting rights, and the actual Form 1120 you submit.
Software defaults and generic checklists often miss indirect or layered ownership. We'll cover what Schedule G is, how to tell if it applies, what to gather, how the 2026 instructions should be used, and when to bring in a professional.
Key Takeaways
- Schedule G discloses ownership information when a corporation meets specific IRS reporting conditions tied to Form 1120.
- Indirect ownership, constructive ownership, and voting rights often matter more than the cap table alone.
- Always confirm figures against the current-year IRS form and instructions, not a prior-year PDF or software default.
- Reconcile your cap table, shareholder agreements, Schedule K responses, Schedule G, and the final return before filing.
- Separate US Schedule G obligations from Australian tax or beneficial ownership reporting; the two frameworks don't overlap.
What Is Form 1120 Schedule G?
Schedule G's official title is "Information on Certain Persons Owning the Corporation's Voting Stock." Per the IRS Schedule G instructions, it applies to "certain entities, individuals, and estates that own, directly, 20% or more, or own, directly or indirectly, 50% or more of the total voting power of all classes of the corporation's stock entitled to vote."
Form 1120 itself is the U.S. Corporation Income Tax Return, used by domestic corporations to report income, deductions, and tax liability. Schedule G is an attachment, not a standalone filing. It only gets completed when Schedule K triggers it.
Always verify the current filing triggers, thresholds, and terminology directly against the IRS instructions for the applicable tax year. Don't carry forward figures from an older article or a previous year's PDF without confirming they still apply for 2026.
How Schedule G Differs From Other Schedules
Schedule G gets confused with several other attachments. Here's the practical distinction:
| Schedule/Form | What it actually covers |
|---|---|
| Schedule K | "Other Information": contains the trigger questions (4a/4b) that require Schedule G |
| Schedule L | Balance sheet information |
| Schedule M-1/M-2 | Book-to-tax reconciliation and retained earnings |
| Form 1120-S | Return for S corporations, not C corporation ownership disclosure |
| Form 1120-C | Return for cooperative associations |
Schedule G is not a general shareholder register, a replacement for your cap table, or a form for reporting a 1099-G state tax refund. That mix-up trips up more preparers than you'd expect, given how different the two forms are.
How Schedule G Works and When It Applies
The end-to-end process looks like this:
- Identify your corporation's filing classification and pull the current tax-year instructions.
- Review ownership and voting records, then determine whether a trigger exists.
- Complete the relevant Schedule G parts, attach it to Form 1120, and keep your workpapers.
Direct, Indirect, and Constructive Ownership
Schedule G's trigger comes from Schedule K questions 4a and 4b, both measured at the end of the tax year:
- Question 4a: any foreign or domestic corporation, partnership, trust, or tax-exempt organisation owns 20% or more directly, or 50% or more directly/indirectly, of voting power (triggers Part I).
- Question 4b: the same thresholds for individuals or estates (triggers Part II).
Ownership analysis goes beyond the share register. Per the IRS Form 1120 instructions, an interest held through a corporation, partnership, estate, or trust is treated as owned proportionately by that entity's own shareholders, partners, or beneficiaries.
Constructive ownership rules under section 267(c) (excluding 267(c)(3)) can attribute one person's interest to another, but only where a qualifying relationship and an existing direct or indirect interest both exist. Family relationship alone isn't enough.
Voting Power Isn't the Same as Stock Value
This trips people up constantly. Schedule G's trigger is based on voting power, not economic value or percentage of stock owned. A shareholder holding a large economic stake in non-voting preferred stock might not trigger Schedule G at all, while a smaller voting-class holder might. Review:
- Separate share classes and their voting rights
- Options or convertible instruments not yet exercised
- Voting agreements or board-control arrangements
- Special control rights attached to preferred stock
A Practical Document-to-Return Workflow
- Compare year-end and during-year cap tables against issuances, transfers, redemptions, option exercises, and conversions.
- Review charters, bylaws, shareholder agreements, and voting agreements — including ownership of any entity shareholders.
- Map each reportable owner into the matching Schedule K question and Schedule G field.
- Reconcile names, identifying numbers, and ownership percentages against the final Form 1120.
- Confirm Schedule G is attached or transmitted as required for that filing year.
Illustrative example only: Say a founder holds 55% of voting stock directly, an outside investor holds 15% directly, and a holding company (in which the founder's spouse holds a controlling interest) holds the remaining 30%. Depending on the attribution facts, the founder's reportable voting interest could exceed the 55% shown on the cap table alone.
This is a simplified scenario: it doesn't resolve every attribution question, and real structures need their own analysis.
Ownership changes, reorganisations, new investment rounds, or shifts in voting rights mean Schedule G isn't a one-off exercise. Review it fresh every tax year.
Key Factors Affecting Schedule G Reporting in 2026 and Beyond
Start with the official 2026 Form 1120 and Schedule G instructions once published, and compare them line-by-line against the prior year for changes to questions, definitions, fields, or electronic filing requirements.
The Fiscal-Year Question
Corporations with a fiscal year need to be precise about which instructions apply. Under the 2025 instructions, the 2025 form covers calendar year 2025 and fiscal years beginning in 2025 and ending in 2026.
A short year beginning and ending in 2026 may use the 2025 form only if the 2026 version isn't yet available. Even then, the return must reflect any law changes effective for tax years beginning after 31 December 2025.
Ownership and Control Factors That Shift the Outcome
- Direct holdings on the shareholder register or cap table
- Interests held through parent companies, subsidiaries, partnerships, trusts, or estates
- Family, option, agreement, or nominee attribution under the official instructions
- Multiple share classes, non-voting stock, and board-control agreements
- Ownership changes occurring anywhere during the tax year, not just at filing date
Foreign Owners and Australian-Based Businesses
Schedule G's Part I and Part II request specific fields only: name, EIN or identifying number "if any," entity type or citizenship country, and voting percentage. There's no address column in either part, and no separate foreign tax-ID field is prescribed. Don't improvise extra fields the form doesn't ask for.
For Australian-based owners of US corporations, keep legal names, entity classifications, and identifying numbers consistent across your cap table and Schedule G. Schedule G is a US federal requirement and has no connection to Australian company, tax, or beneficial ownership registers. Treat the two as entirely separate compliance tracks.
For deadlines, extensions, and mailing addresses, don't guess. The IRS Publication 509 confirms the general due date is the 15th day of the fourth month after year-end, with Form 7004 generally granting a six-month extension. June 30 fiscal-year filers beginning before 2026 may get seven months under transition rules. Confirm your corporation's specific situation before relying on any date.
2026 review checklist:
- Download current-year IRS materials and archive the version used
- Document your ownership analysis in writing
- Assign a reviewer separate from the preparer
- Compare against the prior year's Schedule G
- Set a recurring annual regulatory-update review
Common Issues and Misconceptions
A few misconceptions show up repeatedly in Schedule G preparation, and they're worth naming directly.
"No single shareholder owns a majority, so we can skip it." The 20%-direct or 50%-direct/indirect tests apply per qualifying owner category, and attribution rules can combine separate holders' interests. A clean-looking cap table doesn't automatically mean no trigger exists.
"The cap table settles the question." Voting rights, entity-level ownership of shareholders, legal agreements, and ownership changes during the year all sit outside a standard cap table. Tax software can prepare and transmit the schedule, but it can't independently fix incomplete ownership data or interpret the legal effect of an agreement.
Common errors worth checking for:
- Using an outdated Schedule G form or prior-year instructions
- Answering Schedule K's trigger questions before the ownership review is finished
- Omitting indirect or constructive ownership entirely
- Treating economic ownership as identical to voting ownership
- Entering inconsistent names, identifying numbers, or percentages across forms
- Not documenting the reasoning behind unusual ownership changes
- Assuming an Australian parent or shareholder makes the filing only an Australian matter (ATO GST and BAS obligations sit outside US federal reporting)
If you've found an error: preserve the original filing record, check current IRS amendment instructions, and determine whether an amended Form 1120 and Schedule G are needed. Get professional advice if the correction touches tax liability or complex attribution.
Don't quote penalty figures or audit odds unless they're backed by current IRS authority. General accuracy-related penalties depend on specific underpayment facts, not a fixed per-schedule charge.
When Professional Review May Be Appropriate
Some ownership structures are straightforward enough to self-review. Others aren't. Bring in a professional when your corporation has:
- Foreign owners or multi-tier ownership structures
- Related-party entities holding shares
- Multiple share classes or complex voting agreements
- Family attribution questions
- Recent reorganisations or significant equity transactions
- Disagreement between legal records and finance team figures
Handoff checklist for your accountant or adviser:
- Current and prior-year cap tables
- Stock purchase, transfer, option, conversion, and redemption records
- Charters, bylaws, shareholder and voting agreements
- Ownership details for any entity shareholders
- Owner names, identifying numbers, and entity classifications
- Written conclusions on direct, indirect, constructive, and voting ownership
- Draft Form 1120, Schedule K responses, Schedule G, and prior-year comparison
VJM Global works with international businesses, including Australian-based founders operating US entities, on accounting outsourcing, tax compliance coordination, and keeping financial documentation organised ahead of filing season.
Our guide on Foreign Asset Disclosure & Tax Reporting covers related compliance deadlines and procedures for US entities with foreign-connected assets. This is a service option to consider, not a substitute for reviewing the official IRS instructions yourself.
This article is general educational information, not personalised US tax or legal advice. Confirm current IRS rules against your corporation's specific facts before filing.
Conclusion
Schedule G is an ownership and voting-stock disclosure tied to Form 1120, and whether it applies to your corporation depends entirely on your facts and the current IRS instructions. Getting it right means reconciling legal ownership records, cap-table data, voting rights, indirect or constructive ownership, and your Schedule K answers, not just ticking a box in your tax software.
Use the official 2026 instructions once released, and don't lean on older forms or generic summaries. Start the ownership review before you sit down to prepare the return, document what you find, and bring in qualified help when the structure (especially a cross-border one) gets complicated.
Frequently Asked Questions
What is Form 1120 Schedule G?
Schedule G reports specified ownership or voting-stock information for corporations that meet certain IRS conditions on Form 1120. Always check the current-year IRS form and instructions before completing it.
What is Form 1120 and who must file it?
Form 1120 is the US federal income tax return filed by domestic C corporations. S corporations, partnerships, and certain other entities use different returns, so match your classification to current IRS rules.
When should Form 1120 be filed?
Calendar-year corporations generally must file by the 15th day of the fourth month after year-end. Fiscal-year filers use the same fourth-month rule for their year-end, and IRS extension options may apply.
What is Form 1120-C?
Form 1120-C is the return used by corporations operating on a cooperative basis, distinct from the standard Form 1120. Confirm whether your organisation actually meets the cooperative filing classification before using it.
What is the federal corporate tax rate in the United States?
The US federal corporate income tax rate is a flat 21% under current law. State corporate taxes may also apply, so confirm the federal and state rates in effect for your tax year.
Where do I mail my tax forms to the IRS?
Mailing addresses vary by form, whether payment is enclosed, and your principal office location. Use the IRS "Where to File" page for the current address and e-file options that match your situation.
