When you invest in, co-found or buy into an Australian company, the shareholding percentage is only part of the story. A shareholder agreement helps answer the difficult questions that arise after the initial enthusiasm has passed: who makes decisions, what happens if further funding is needed, how profits are handled, and what occurs if someone wants to leave.

For Australian investors and small business owners, a well-considered agreement can provide a practical framework for protecting an investment while reducing the risk of disputes. It should work alongside the company’s constitution, the Corporations Act and the company’s actual commercial arrangements, rather than sitting in a drawer as an unsigned or outdated document.

Understand what a shareholder agreement is designed to do

A shareholder agreement is a private contract between shareholders and, ideally, the company itself. It sets out agreed rules for the relationship between owners, particularly where there is more than one shareholder or where investors are not involved in daily management.

It is different from a company constitution. A constitution governs the company’s internal management and operates within the framework of Australian corporations law. The replaceable rules in the Corporations Act may apply where a company does not have a constitution, or where its constitution does not deal with a particular matter.

A shareholder agreement can go further into the commercial expectations between the parties. For example, it may address:

  • how directors are appointed or removed;

  • decisions requiring shareholder approval;

  • whether shareholders must contribute additional capital;

  • restrictions on selling or transferring shares;

  • rights for minority investors when a majority shareholder sells;

  • dividend expectations;

  • confidentiality and intellectual property;

  • dispute resolution and deadlock procedures; and

  • what happens on death, disability, insolvency, retirement or serious breach.

The agreement should not be treated as a substitute for a constitution. If the documents conflict, or if a proposed arrangement is inconsistent with the Corporations Act, the parties may face practical and legal difficulties when trying to implement their agreement.

For that reason, it is important to review the company constitution, share structure, existing investor documents and any finance arrangements before finalising a shareholder agreement. The documents should be drafted to work together, with a clear statement about which document takes priority if there is an inconsistency.

Set clear decision-making rules from the outset

A common source of conflict is the gap between ownership and control. A shareholder may hold a substantial stake but have little involvement in daily operations. Another shareholder may also be a director, employee, founder or lender to the company. Those roles come with different rights, responsibilities and potential conflicts.

The agreement should make a practical distinction between:

  • board decisions, which concern management and operation of the business;

  • shareholder decisions, which concern ownership-level matters; and

  • reserved matters, which are important decisions requiring a higher level of approval than ordinary business decisions.

Reserved matters are particularly useful for investors who want protection without becoming involved in every operational choice. They can be tailored to the size and risk profile of the business.

Examples may include decisions about:

  • issuing new shares, options or convertible instruments;

  • changing rights attached to shares;

  • borrowing above an agreed limit;

  • granting security over material company assets;

  • approving or changing a business plan;

  • entering into major contracts;

  • buying or selling a business, division or key asset;

  • paying dividends or making other distributions;

  • changing director remuneration;

  • appointing or removing directors;

  • related-party transactions;

  • changing the company’s constitution; and

  • winding up, selling or listing the company.

The approval threshold should reflect the purpose of the clause. Requiring every shareholder to approve every major decision can give a very small investor an effective veto over the company. On the other hand, allowing a simple majority to make all significant decisions may leave a minority investor exposed.

The best approach is usually a balanced one. Certain fundamental matters may require broad shareholder support, while ordinary commercial decisions remain with the board and management team.

Directors must also remember that their duties are owed to the company. A shareholder agreement cannot authorise directors to ignore those duties simply because a shareholder or founder prefers a particular outcome. Where a director has a material personal interest in a company matter, disclosure and careful governance are especially important.

Protect against unwanted dilution and share transfers

Investment can become contentious when the company needs more money. If one shareholder can fund a new share issue and another cannot, the ownership balance may change quickly. This is why funding and dilution provisions should be discussed before capital is urgently required.

The agreement may set out the intended sources of future funding, such as:

  • further equity contributions;

  • shareholder loans;

  • external finance;

  • retained profits; or

  • a combination of these options.

It should also explain whether shareholders have a right to participate in a new share issue before shares are offered to outside investors. For proprietary companies, the Corporations Act includes a replaceable rule dealing with offers of new shares to existing holders of the same class, but the company’s constitution and the specific transaction need to be reviewed carefully.

Pre-emptive rights can help existing shareholders maintain their proportional ownership if they are willing and able to invest. However, a company also needs enough flexibility to raise capital efficiently, particularly if it is pursuing a time-sensitive opportunity or negotiating with an external investor.

Transfer restrictions are equally important. Most small companies do not want a shareholder selling their stake to an unknown buyer without first giving the other owners an opportunity to respond.

A shareholder agreement may include:

  • a requirement to offer shares to existing shareholders first;

  • a right of first refusal or similar matching right;

  • restrictions on transfers to competitors or unsuitable parties;

  • permitted transfers to family trusts, holding companies or related entities;

  • approval processes for transfers;

  • valuation rules for transfers; and

  • obligations to sign necessary documents and update company records.

The agreement should also deal with involuntary or sensitive transfer events. These can include death, permanent incapacity, bankruptcy, insolvency, divorce-related arrangements, retirement from the business or a serious breach of the agreement.

Without clear provisions, the remaining shareholders may find themselves in business with an executor, family member, trustee in bankruptcy or unrelated purchaser. That may not be anyone’s preferred outcome, even where the parties remain on good terms.

Build fair exit rights for majority and minority investors

An exit clause is not pessimistic. It is a practical part of investing. Shareholders may eventually want to sell because the business has grown, priorities have changed, a new investor is needed or the relationship between owners has broken down.

Two commonly used protections are tag-along and drag-along rights.

A tag-along right can allow minority shareholders to participate in a sale proposed by a majority shareholder. In practical terms, if a buyer wants to acquire the majority stake, the minority holders may be able to sell their shares on the same terms rather than being left behind with a new controlling owner.

A drag-along right can allow a qualifying majority to require minority shareholders to sell if the whole company is being acquired. This can make a genuine sale more achievable because a buyer may not want to purchase only part of the company.

Both mechanisms need careful drafting. The agreement should specify:

  • the level of shareholder support needed to activate the right;

  • the type of transaction covered;

  • whether all shareholders receive the same price and terms for the same class of shares;

  • how different share classes are treated;

  • the process and timing for notices;

  • who can give warranties to a buyer;

  • limits on personal liability for selling shareholders; and

  • what happens if a shareholder refuses, cannot be contacted or fails to sign documents.

Valuation is another critical area. A shareholder agreement may provide for an agreed formula, a valuation by an independent expert, a negotiated process, or a combination of methods depending on the exit event.

The method should be realistic for the company. A valuation formula that seems simple at the beginning may produce an unreasonable result if the business changes substantially, takes on debt, owns valuable intellectual property or depends heavily on one founder’s personal efforts.

A practical example

Consider a company started by two working founders, with a third investor holding a smaller passive stake. Several years later, one founder wants to leave and sell their shares to an outside buyer.

If the shareholder agreement contains a clear transfer process, the remaining founder and investor can review the proposed sale, consider whether to buy the shares themselves and understand how the price will be determined. If it does not, the company may face a dispute about valuation, control and whether the departing founder can sell to the proposed buyer.

The agreement cannot remove every commercial challenge, but it can provide a process before relationships become strained.

Address deadlocks, behaviour and business continuity

A deadlock can occur when shareholders or directors have equal voting power and cannot agree on a significant issue. It is particularly common in companies owned equally by two founders.

Simply stating that a decision requires unanimous consent does not resolve a deadlock. It may instead give each party the ability to block the other indefinitely.

A useful deadlock clause should establish an orderly escalation process. Depending on the business, it may involve:

  1. good-faith discussions between the relevant decision-makers;

  2. referral to nominated senior representatives;

  3. mediation with an independent mediator;

  4. an agreed buy-sell process; or

  5. another carefully designed mechanism suited to the company.

Buy-sell clauses require particular care. A poorly designed process can unfairly favour the shareholder with more access to cash, better information or stronger bargaining power. It is important to consider funding, valuation, tax consequences and whether a party is realistically able to complete a purchase.

The agreement should also set reasonable expectations about conduct. This may include confidentiality obligations, protection of customer information, non-solicitation clauses, restraints where appropriate and requirements to protect the company’s intellectual property.

Restraint provisions should be tailored to the business and the individual’s role. Broad or unrealistic restraints are more likely to create uncertainty and disagreement than meaningful protection.

Intellectual property deserves close attention in founder-led businesses. The company should have appropriate rights to use the software, designs, brand assets, processes, documents and other material that the business depends on. If a founder created key material before the company was formed, it may be necessary to document an assignment or licence to the company.

Consider tax, record-keeping and ownership structures before signing

A shareholder agreement is primarily a legal and commercial document, but tax and accounting consequences should be considered before commitments are made.

The sale or transfer of shares can have capital gains tax consequences. In many ordinary share sale arrangements, the relevant CGT event occurs when the disposal contract is entered into, rather than when settlement funds are paid. This can affect the income year in which the transaction needs to be considered.

The tax outcome can differ significantly depending on the structure and transaction. For example, treatment may vary where shares are held personally, through a discretionary trust, by a company or through a self-managed superannuation fund. A buy-back by the company can also have different tax consequences from a sale to another shareholder or an outside purchaser.

Private company arrangements need additional care where money, assets or benefits move between the company and shareholders, or their associates. Division 7A may be relevant to loans, payments or forgiven debts involving private companies. A shareholder agreement should not casually describe withdrawals, loans or funding arrangements without considering how they will be documented and managed.

State and territory taxes may also need review. Depending on the jurisdiction and the assets held by the company, a share acquisition or restructuring can trigger landholder or duty issues. These rules are not uniform across Australia and should not be assumed to operate the same way in every state or territory.

From an accounting and administration perspective, the company should maintain accurate records of:

  • share issues, transfers and cancellations;

  • shareholder loans and loan terms;

  • board and shareholder resolutions;

  • dividends and distributions;

  • options, convertible instruments and employee equity arrangements;

  • valuations used for transactions; and

  • signed copies of the constitution and shareholder agreement.

Company records, registers and ASIC notifications should be updated when required. It is far easier to maintain a clear ownership record as changes happen than to reconstruct the history during a sale, dispute, audit or due diligence process.

Keep the agreement current as the business changes

A shareholder agreement should be reviewed when there is a major change in ownership, funding, strategy or personal circumstances. A document prepared when a business had two founders and no employees may not suit a company that later has outside investors, multiple share classes, key staff equity or substantial borrowing.

Review points may include:

  • a new shareholder or investor joining the company;

  • the issue of new shares or options;

  • a founder becoming less involved in the business;

  • a shareholder beginning to hold shares through a different entity;

  • a planned business sale or succession arrangement;

  • a change in directors;

  • a significant shareholder loan;

  • an expansion into a new market or business line; or

  • a material disagreement between owners.

New shareholders should generally be required to agree to be bound by the existing shareholder agreement before their shares are issued or transferred. This helps avoid a situation where some owners are subject to detailed obligations while others are not.

A periodic review can also identify whether the agreement still aligns with the constitution, company registers, accounting records and the way the business actually operates.

The value is in the conversation as much as the document

A shareholder agreement is most effective when it records decisions that shareholders have genuinely discussed and understood. It is not merely a legal formality for a start-up, family business or investment vehicle.

The key is to address ownership, decision-making, funding, transfers, exits and disputes while the parties are still aligned. Doing so can protect both the investment and the working relationships that support the business.

This article is general information only and is not personal financial, tax or legal advice. Before entering into or changing a shareholder agreement, speak with a registered tax agent, accountant and legal adviser, such as the team at, about your particular circumstances and ownership structure.