Australia's New Merger Rules in 2026: What Business Owners and Investors Need to Know

Australia has changed the rules of buying a competitor, acquiring a supplier and rolling up small operators. From 1 January 2026, acquisitions meeting prescribed thresholds generally require notification to the Australian Competition and Consumer Commission before completion. The reform arrives alongside new Reserve Bank research showing that merger activity is much broader than conventional datasets suggested.

The RBA’s July 2026 Research Discussion Paper built the first large-scale database of Australian mergers and acquisitions using employee movements, tax-consolidation changes and ASIC forms. It identified about 1,500 mergers a year across two decades. Mid-sized, high-profit but low-productivity businesses were more likely to become targets. Patent-rich firms also attracted buyers, while large trademark-owning entities were prominent acquirers. Serial acquisitions appeared in several high-profile industries.

For an owner, this matters well beyond competition lawyers. A deal’s structure can affect tax, price, employee entitlements, finance, completion timing and whether the buyer is allowed to proceed. For an investor, a compelling strategic story still needs to survive regulatory and valuation discipline.

Why Australia’s M&A Data Has Been Incomplete

Before the new regime, Australia did not have a universal formal requirement for merger parties to notify the regulator. Public announcements captured listed-company deals and major transactions, but thousands of private acquisitions were harder to observe.

The RBA researchers combined three administrative signals:

1. clusters of employees moving between firms in linked employer-employee data;
2. firms moving between income-tax consolidated groups;
3. takeover and other notification forms submitted to ASIC.

Each method sees a different part of the market. A tax-group move is useful for corporate acquisitions but misses many asset purchases. Employee clusters can identify operational transfers but can confuse outsourcing or restructures. ASIC forms cover formal corporate events but not every small private deal. Combined, the approaches produce a more complete picture.

The RBA study is research, not a regulatory transaction register. Its methods and definitions differ from the ACCC regime. Nevertheless, it underlines why policymakers wanted better visibility.

The New Mandatory Merger Regime

Australia moved from an informal, largely voluntary clearance system to a mandatory and suspensory administrative system. Voluntary use began on 1 July 2025. From 1 January 2026, a notifiable acquisition cannot legally complete until the ACCC permits it.

“Mandatory” means qualifying transactions must be notified. “Suspensory” means completion must wait. The ACCC becomes the first-instance decision-maker, applying the legal test of whether the acquisition would have, or be likely to have, the effect of substantially lessening competition.

Core Threshold Tests

Threshold rules are detailed and should be checked against current legislation and regulations. The announced framework includes tests broadly based on Australian turnover, target turnover, transaction value and accumulated acquisitions.

These figures are not a do-it-yourself legal opinion. “Connected entities”, “Australian turnover”, control, asset acquisitions and transaction value have defined meanings. Ministerial determinations can create sector-specific thresholds. Exemptions can apply to certain land, financial-market and internal restructuring transactions.

Why Three-Year Aggregation Matters

A buyer cannot necessarily remain below scrutiny by buying ten smaller competitors instead of one large competitor. Acquisitions during the previous three years may count toward monetary thresholds, particularly where businesses supply the same or substitutable goods or services.

Consider a national group with $550 million Australian turnover:

• Year 1: acquires a target with $4 million turnover;
• Year 2: acquires two targets with $3 million each;
• Year 3: proposes an $8 million-turnover target.

The final target may look small in isolation, but cumulative acquisitions can engage the regime. A buyer pursuing a roll-up should maintain a live acquisition ledger that records completion date, turnover, business activities, geography, consideration and controlling interests.

The Review Timetable

Deal documents must allow enough time for regulatory clearance. A simple agreement signed on 1 August with unconditional completion on 15 August may be impossible if notification is required.

Phase 1

The initial review is generally 30 business days. The ACCC may determine a straightforward transaction after a 15-business-day fast-track period. “Business days” exclude weekends and relevant public holidays, so calendar time is longer.

Phase 2

If competition concerns require deeper analysis, Phase 2 can add 90 business days. The ACCC may examine internal documents, customer views, economic evidence, entry barriers, data holdings, vertical foreclosure and the cumulative effect of earlier purchases.

Public-Benefit Route and Review

Parties may seek approval based on public benefits after competition assessment pathways, and decisions can be reviewed by the Australian Competition Tribunal under the statutory framework. The exact path affects evidence, timing and cost.

Information requests, extensions and remedies can alter timing. Long-stop dates, financing commitments and employee communications should reflect a realistic downside timetable.

Which Businesses Are Attractive Targets?

The RBA found that profitable but lower-productivity mid-sized firms were relatively likely targets. A buyer may believe it can retain the target’s customers while improving systems, procurement, utilisation or management.

Patent-rich targets were also more likely to be acquired. A patent can provide technology, defensive protection or a quicker route to market. Yet patent count is not the same as patent value. Due diligence should examine ownership, remaining term, jurisdictions, challenges, licensing, employee invention clauses and whether revenue actually depends on the protected claims.

Trademarks were associated with acquirers, consistent with established businesses using brand, distribution and management infrastructure to integrate smaller operations.

A Productivity-Uplift Example

Suppose a target produces:

At 4.5 times current EBITDA, indicative enterprise value is $3.375 million. If the buyer achieves $1.15 million EBITDA and the multiple remains 4.5, implied value becomes $5.175 million. The $1.8 million uplift looks attractive, but integration costs, tax, financing, customer losses and execution risk must be deducted.

How to Prepare a Business for Sale

Normalise Earnings

Private-company accounts often include owner wages above or below market, family expenses, one-off legal costs, non-recurring grants and discretionary vehicles. Buyers convert reported profit into maintainable EBITDA.

For example:

Every adjustment needs evidence. Aggressive add-backs reduce credibility and can cause price chips later.

Clean Up Working Capital

Many deals use a cash-free, debt-free price with normal working capital delivered at completion. If normal working capital is $600,000 but only $420,000 is delivered, the purchase price may fall by $180,000.

Review aged receivables, obsolete inventory, customer deposits, annual leave, unearned revenue and related-party balances. A seller should not wait for due diligence to discover that 20% of debtors are over 90 days.

Secure Intellectual Property and Contracts

Confirm that the company, not a founder or contractor, owns its domain, software, designs, trademarks and customer data. Review change-of-control clauses in leases, finance, licences and major customer contracts. Consent can become a completion condition and a source of delay.

Build a Data Room

A credible data room normally includes three years of financial statements and tax returns, monthly management accounts, customer concentration, contracts, payroll, super, insurance, litigation, licences, privacy compliance and asset registers. The ACCC process may also require market-share and competitive-overlap evidence.

Tax and Deal Structure

An asset sale and a share sale can produce materially different outcomes.

In a share sale, the buyer acquires the company with its history and liabilities. The seller generally makes a capital gain on shares. In an asset sale, the buyer selects assets and liabilities, but individual tax outcomes can arise for goodwill, trading stock and depreciating assets. GST may not apply if the sale qualifies as a GST-free supply of a going concern and the statutory requirements are met.

Eligible Australian small-business owners may access CGT concessions:

• the 15-year exemption;
• the 50% active asset reduction;
• the retirement exemption, with a lifetime limit;
• the small-business rollover.

Eligibility involves the $2 million aggregated turnover test or $6 million maximum net asset value test, active-asset requirements, ownership periods and stakeholder rules. The general 50% CGT discount may also apply to individuals and trusts for assets held at least 12 months, but not to companies.

Tax advice should begin before heads of agreement. A last-minute restructure can fail CGT timing rules, create duty or trigger anti-avoidance concerns.

Financing an Acquisition

Buyers may combine senior debt, vendor finance, earn-outs and equity. Each affects risk and price.

Suppose a $4 million acquisition is funded with $2 million bank debt at 7.5%, $500,000 vendor finance at 9% and $1.5 million equity. Annual cash interest is $195,000 before principal repayments and fees. If maintainable EBITDA is $800,000, interest cover is about 4.1 times. If EBITDA falls 30% to $560,000, cover drops to 2.9 times before tax, capital expenditure and working capital.

An earn-out can bridge valuation disagreement but creates disputes over accounting policies, cost allocations and management control. Define the metric, period, access rights, permitted actions and worked examples.

Due Diligence for Buyers

A buyer should test:

Financial Quality

Reconcile revenue to bank receipts and tax filings. Analyse gross margin by customer and product. Identify capital expenditure that has been deferred to flatter profit. Model customer loss and wage inflation.

Legal and Regulatory Exposure

Check employment classification, modern awards, leave, super guarantee, privacy, licences, environmental obligations and litigation. Confirm whether the proposed acquisition is notifiable and whether foreign-investment approval is relevant.

Competition Risk

Prepare an honest overlap analysis. Define products customers consider substitutes, geographic reach, market shares, barriers to entry and buyer power. Internal documents that describe a target as “eliminating our closest competitor” will receive attention.

Integration

Assign owners to payroll, technology, brand, suppliers, customer communication and culture. Synergies without accountable actions are spreadsheet optimism.

What Investors Should Watch

For ASX investors, acquisition announcements should be tested against five questions:

1. Is the price based on historical or forecast earnings?
2. Are claimed synergies revenue-based, cost-based or both?
3. How much debt and equity dilution fund the deal?
4. Does regulatory clearance create a long gap before completion?
5. Has management integrated acquisitions successfully before?

A transaction can increase earnings per share while destroying value if cheap debt funds an overpriced target. Return on invested capital should eventually exceed the weighted average cost of capital.

A 90-Day Readiness Plan

Days 1 to 30

Appoint accounting and legal advisers, identify objectives, establish maintainable earnings and map ownership. Buyers should begin threshold and market analysis before approaching targets.

Days 31 to 60

Prepare or review the data room, fix IP ownership gaps, quantify working capital and model tax outcomes. Draft heads of agreement with ACCC conditions and a realistic long-stop date.

Days 61 to 90

Test finance under downside scenarios, plan employee and customer communication, prepare notification information and allocate integration responsibilities. Sellers should maintain trading performance; a deal is not complete until funds clear.

Turn a Transaction Into an Evidence-Based Decision

The new rules reward preparation. Owners need defensible earnings, clean records and realistic tax modelling. Buyers need a competition timetable and a plan for value creation that survives downside testing. Find an Australian accountant or financial adviser through WealthWorks before signing terms that lock in price, structure or timing.