Large Proprietary Company Audit Requirements in Australia: A 2026 Compliance Guide

For many Australian business owners, the question of whether their company needs an audit is not always straightforward. As companies grow, they can quietly cross regulatory thresholds that trigger mandatory audit and financial reporting obligations under the Corporations Act 2001 — often without realising it. Understanding when an audit is legally required, what it involves, and how to find a qualified auditor is essential for directors who want to stay compliant and avoid ASIC enforcement action.

Understanding Large Proprietary Company Audit Requirements

Under the Corporations Act 2001, a proprietary company is classified as "large" if it meets at least two of the following three criteria in a financial year:

• Consolidated revenue of $50 million or more for the financial year
• Consolidated gross assets of $25 million or more at the end of the financial year
• 100 or more employees at the end of the financial year

If your company satisfies at least two of these thresholds, it is legally required to prepare an annual financial report, have it audited by a registered company auditor, and lodge it with ASIC within four months of the financial year end.

Small proprietary companies — those that do not meet two of the three criteria — are generally exempt from these obligations. However, exceptions apply for foreign-controlled companies, entities with crowd-sourced funding (CSF) shareholders who have raised $3 million or more, and companies directed to report by ASIC or shareholders holding at least 5% of voting rights.

Why This Matters More Than Ever in 2026

ASIC has made the non-lodgement of audited financial reports by large proprietary companies a key enforcement priority in 2025 and 2026. The regulator is actively cross-referencing ATO data to identify companies that have grown beyond the small-company thresholds but have not updated their reporting practices.

In recent enforcement rounds, ASIC issued substantial infringement notices to companies that failed to lodge audited reports on time. Directors of non-compliant companies face administrative penalties, late lodgement fees, court-ordered fines, and in serious cases, disqualification from managing corporations.

Additionally, Australia is phasing in mandatory sustainability reporting requirements from 1 January 2025, with progressive application through to 1 July 2027. Large proprietary companies will increasingly need to prepare and lodge sustainability reports alongside their annual financial reports, adding another layer of compliance complexity.

What a Company Audit Involves

A statutory audit is an independent examination of a company's financial statements to determine whether they present a "true and fair view" of the company's financial position and comply with Australian Accounting Standards (AASB) and the Corporations Act 2001.

The audit process typically includes the following stages:

1. Planning and risk assessment — The auditor gains an understanding of the business, its industry, and key financial risks
2. Internal controls review — Evaluating the effectiveness of the company's financial controls and processes
3. Substantive testing — Verifying account balances, transactions, and disclosures through sampling and analytical procedures
4. Auditor's report — Issuing an independent opinion on whether the financial statements are free from material misstatement

The auditor must also provide an independence declaration confirming they have no conflicts of interest that could compromise their objectivity.

Key Qualifications to Look For in an Auditor

Not every accountant is qualified to conduct a statutory audit. When engaging an auditor for your company, look for the following credentials and attributes:

• Registered Company Auditor (RCA) — Must be registered with ASIC under the Corporations Act 2001. This is a legal requirement for auditing proprietary and public companies
• CPA Australia or Chartered Accountants ANZ membership — Membership of a recognised professional body indicates ongoing CPD obligations and ethical standards
• Industry experience — Auditors with experience in your specific industry will better understand sector-specific risks and accounting treatments
• Independence — The auditor must be independent of the company, its directors, and related parties. They cannot audit a company where they have a financial interest or close personal relationship with management
• Audit quality track record — Ask about their ASIC audit inspection history and any quality review findings from their professional body
• Team size and capacity — Ensure the firm has sufficient resources to complete the audit within your lodgement deadline

Common Mistakes Australian Companies Make With Audits

Many directors are unaware of their audit obligations until they receive a notice from ASIC. Here are the most common pitfalls to avoid:

• Failing to monitor size thresholds — Companies that grow rapidly can cross the large proprietary company thresholds mid-year without realising it. Directors should review their size classification annually
• Engaging an unregistered auditor — Using an accountant who is not a Registered Company Auditor is a breach of the Corporations Act and renders the audit invalid
• Leaving insufficient time — Audits require significant preparation. Engaging an auditor too close to the lodgement deadline often results in rushed work or missed deadlines
• Poor record-keeping — Auditors require complete and well-organised financial records. Inadequate documentation leads to audit delays and additional costs
• Assuming the exemption still applies — The grandfathered exemption for certain older large proprietary companies ended for financial years ending on or after 10 August 2022. Companies that relied on this exemption must now comply
• Overlooking foreign control obligations — Small proprietary companies controlled by a foreign entity may still have audit obligations even if they fall below the size thresholds

Australian Regulatory Context

The primary regulator for company auditing in Australia is the Australian Securities and Investments Commission (ASIC). ASIC registers company auditors, conducts risk-based surveillance of audit files, and takes enforcement action against non-compliant companies and auditors.

Auditing standards in Australia are set by the Auditing and Assurance Standards Board (AUASB), which issues Australian Auditing Standards (ASAs) aligned with International Standards on Auditing (ISAs). All registered company auditors must comply with these standards.

For superannuation funds, the Australian Prudential Regulation Authority (APRA) oversees APRA-regulated funds, while SMSF auditors are separately registered with ASIC and must comply with the Superannuation Industry (Supervision) Act 1993.

The Financial Reporting Council (FRC) provides strategic oversight of the financial reporting and auditing framework in Australia, including the adoption of international standards and the independence of standard-setting bodies.

Directors who fail to comply with audit and lodgement obligations may face civil penalties under the Corporations Act 2001, including fines of up to $1.565 million for serious contraventions.

Questions to Ask When Engaging an Auditor

Before appointing an auditor, use this checklist to assess their suitability for your company:

• Are you registered as a Registered Company Auditor (RCA) with ASIC? What is your registration number?
• Do you have experience auditing companies in our industry and of our size?
• Can you confirm your independence from our company, directors, and related parties?
• What is your audit methodology and how do you approach risk assessment?
• What information and records will you need from us, and by when?
• What is your timeline for completing the audit and issuing the auditor's report?
• Have you had any adverse findings from ASIC audit inspections or professional body quality reviews?
• What are your fees, and how are they structured?
• How do you handle situations where you identify material misstatements or control weaknesses?
• Can you provide references from similar clients?

How MyMoney® Can Help

Finding a qualified, independent auditor who understands your industry and can meet your lodgement deadlines is critical — but it can be time-consuming to identify the right professional through traditional channels.

MyMoney® connects Australian businesses with verified, experienced auditors who are registered with ASIC and have a proven track record across a range of industries and company sizes. Whether you need a statutory audit for a large proprietary company, an SMSF audit, or assurance services for a not-for-profit, our marketplace makes it easy to compare professionals and receive competitive proposals.

To get started, post a brief describing your audit requirements and receive tailored proposals from qualified auditors. Alternatively, browse our auditor directory to explore professionals by location, specialisation, and experience.

Don't wait for an ASIC notice to prompt action. Engaging the right auditor early ensures your company meets its obligations, avoids penalties, and maintains the financial credibility that supports growth and stakeholder confidence.