Creating A Share Sale And Purchase Agreement: Essential Australian Business Guide

Thinking about buying or selling shares in an Australian company? Whether you’re bringing in a new investor, selling down your stake, or exiting completely, a share sale and purchase agreement is the key document that sets the rules for the deal and protects everyone involved.

Share transactions can feel complex if you haven’t been through one before. The good news is that with the right preparation, a clear process and a well-drafted agreement, you can move forward confidently and avoid common pitfalls.

In this guide, we’ll explain what a share sale and purchase agreement is, how share sales work in Australia, what to plan for, and the steps to create an agreement that actually reflects your intentions. We’ll also cover the legal requirements, the filings to consider, and practical tips to keep your deal on track.

What Is A Share Sale And Purchase Agreement?

A share sale and purchase agreement is a contract that sets out the terms on which one party (the seller) sells shares in a company to another party (the buyer). It covers what is being sold, the price and payment mechanics, conditions that must be met before completion, warranties and indemnities, and what happens after completion.

It’s the roadmap for your deal. Putting the agreed terms in writing reduces risk, minimizes misunderstandings, and gives both sides certainty about timing, money and responsibilities.

A share sale and purchase agreement is commonly used for:

• Selling part or all of a business via a share sale (as opposed to selling its assets)
• Adding or removing shareholders during a restructure or buyout
• Succession planning within family companies
• Investor rounds that involve secondary sales (existing shareholders selling to new investors)

Your company’s existing legal framework will influence how a share sale proceeds. In particular, your Shareholders Agreement and your Company Constitution may include pre-emption rights, approval requirements, or drag/tag provisions that impact timing and approvals. It’s important to review these early so your agreement aligns with them.

How Do Share Sales Work In Australia?

In Australia, the Corporations Act 2001 (Cth) and your company’s constitution set the framework for transferring shares. The share sale and purchase agreement then fills in the commercial and legal details between the buyer and seller.

At a high level, your agreement will specify:

• Parties: who is selling and who is buying (sometimes multiple sellers or buyers)
• Shares: exactly which shares are being sold (class, number and any rights attached)
• Price and payment: total price, deposits, adjustments, and timing (e.g. at completion or in instalments)
• Conditions: what must happen before completion (for example, internal approvals or financing)
• Warranties and indemnities: promises about the company and allocation of risk if certain issues emerge
• Completion steps: what happens on the day (document handover, register updates, payment flow)
• Post-completion obligations: restraints, transitional assistance, or information handover

Completion does not require “ASIC consent”. Private company share transfers are primarily an internal process governed by the constitution and the agreement. Once conditions are met and documents are signed, the company’s share register is updated and the buyer becomes the registered holder. Many modern companies do not issue paper share certificates-updating the register is the critical step and is the legal record of ownership.

Where filings are required, they generally involve notifying ASIC of changes to members or share structure after completion rather than seeking permission beforehand. We cover this in more detail below.

Planning Your Deal: Key Considerations

Before drafting anything, take a step back and plan your approach. Clear planning makes negotiation easier and helps your lawyer tailor the agreement to your transaction.

• Valuation and price: How was the price set? Is there a valuation, revenue multiple, or earn-out? Will there be completion accounts or a locked box approach?
• Approvals and restrictions: Does your constitution or Shareholders Agreement require board or shareholder approval, or grant existing holders first rights to buy (pre-emption)? Build this timing into your deal.
• Who bears which risks: Identify the big-ticket risks (tax, litigation, IP ownership, key contracts, employee entitlements) and decide which are covered by warranties and which need specific indemnities or price adjustments.
• Diligence and disclosure: Will the buyer do legal and financial due diligence? How will the seller disclose exceptions to warranties (via a disclosure letter and bundles)?
• Payment mechanics: Is payment upfront, staged, or contingent on milestones? Will funds be escrowed until conditions are satisfied?
• Control and transition: For larger deals, agree how control passes (e.g. resignations and appointments at completion) and what transitional support is needed from the sellers.
• Structure choice: Consider whether a share sale or asset sale better suits your goals. The differences can be significant for risk allocation and tax-see this comparison of Share Sale vs Asset Sale.

It’s also important to think about confidentiality during negotiations. If sensitive information will be shared, put a Non-Disclosure Agreement in place and restrict access to a need-to-know basis (for example, via a data room).

Step-By-Step: Creating Your Agreement

1) Prepare And Scope The Deal

Gather the basics: cap table, constitution, any existing investor documents, key contracts, and financial information. Work out what’s being sold, the timeline you’re aiming for, and the approvals you’ll need under your constitution and Shareholders Agreement.

2) Negotiate The Heads Of Terms

Settle the commercial headline points first: price, which shares, timing, any conditions (financing, approvals), warranty coverage, indemnities for known issues, and any restraints on sellers. Many parties capture this in a short “term sheet” or heads of agreement so everyone is aligned before lawyers draft.

3) Conduct Due Diligence

Buyers should review legal, financial and operational risks. That often includes corporate records, IP ownership, material contracts, compliance, litigation, and employee entitlements. If you want structured support, consider a formal legal diligence process (Sprintlaw offers a legal due diligence service via our business sales team).

4) Draft The Share Sale And Purchase Agreement

The agreement should be tailored to your deal-generic templates often miss important risk areas. Expect sections covering sale and purchase mechanics, conditions precedent, warranties, indemnities, limitations of liability (caps, baskets, time limits), completion deliverables, and post-completion obligations. Your lawyer will guide what to include based on your risks and goals.

5) Satisfy Conditions And Line Up Completion

Obtain internal approvals (board or shareholder approvals if required), line up funds, and prepare completion deliverables. For the transfer itself, you’ll typically execute an instrument of transfer (sometimes called a “share transfer form”) in the format required by the constitution-this is a company document, not an ASIC form. The company then updates its share register; that register update is what legally records the new owner. For a practical overview of the process, see this guide on how to transfer shares.

6) Complete And Update Records

At completion, funds are paid, resignations/appointments (if any) are effected, the instrument of transfer is delivered, and the company updates the share register. Many companies don’t issue paper share certificates-so don’t worry if your constitution doesn’t require them. Ensure the company minutes and registers are updated promptly.

7) After Completion: Notices And Ongoing Obligations

After completion, you’ll typically need to notify ASIC of changes to members or share structure within the required timeframe. This is commonly done through ASIC’s online portal; historically this was captured by “Form 484”. If you’re unsure what gets lodged and when, this overview of ASIC Form 484 and company detail changes is a useful reference. Also calendar any ongoing obligations such as warranty periods, earn-out milestones, and restraint periods.

Common Pitfalls To Avoid

• Skipping the constitution: Missing pre-emption or approval requirements can delay or derail your deal.
• Vague drafting: Ambiguous pricing, unclear conditions, or loose warranty language can create disputes later.
• Under-cooked diligence: Buyers should verify key risks rather than rely only on warranties; sellers should disclose known exceptions clearly.
• Assuming ASIC “consent” is needed: For private share transfers, the focus is internal approvals and register updates-not external consent.
• Paper certificates obsession: Certificates are optional under many constitutions; the share register is the key legal record.

Legal Requirements, Filings And Tax Considerations

Corporations Act And Company Rules

Your transaction must comply with the Corporations Act 2001 (Cth) and your constitution. That usually means following any transfer restrictions, obtaining required internal approvals, and keeping an accurate member register.

ASIC Notifications

While ASIC doesn’t “approve” private share transfers, companies must notify ASIC of changes to company details (for example, changes to members or share structure) within the statutory timeframe. This is typically handled through the company’s online ASIC account. If you need a refresher, this article breaks down what’s covered by Form 484-style notifications and common lodgement scenarios.

Privacy And Confidentiality During Diligence

If you’re sharing customer, employee or other personal information during diligence, ensure you have appropriate confidentiality controls and a current Privacy Policy. Use a Non-Disclosure Agreement and restrict access to sensitive data to necessary personnel only.

Employment And Commercial Contracts

A share sale doesn’t automatically terminate contracts. The company continues with its existing rights and obligations, so check change-of-control clauses in key customer, supplier and finance agreements, and consider whether any consents are required before completion. If leadership or staffing will change, line up the right Employment Contract updates and handover plans.

Tax And Duty

Share sales can trigger tax consequences such as capital gains tax (CGT) for sellers and, in some states and territories, duty for “landholder” entities or particular share transfers. There may also be small business CGT concessions or rollover relief available depending on your circumstances.

Tax consequences depend on your specific facts. It’s important to obtain independent tax advice before you sign so the agreement and price mechanism are structured with tax in mind.

Key Takeaways

• A share sale and purchase agreement is the central contract for buying or selling shares in an Australian company-tailor it to your constitution, approvals and risk profile.
• For private companies, share transfers are primarily an internal process: follow the constitution, execute the transfer instrument, and update the share register; ASIC is notified after changes, not asked for consent.
• Plan early for valuation, internal approvals, warranties/indemnities, disclosure, and payment mechanics so the drafting stage is smooth and fast.
• Use clear steps: prepare, agree terms, diligence, draft, satisfy conditions, complete, and lodge any required ASIC notifications (often in the style of Form 484 updates).
• Protect confidentiality with an NDA and manage data responsibly under your Privacy Policy.
• Consider whether a share sale or asset sale better fits your goals, and get independent tax advice so your deal is structured efficiently.
• Core documents you’ll likely need include the share sale and purchase agreement, the company’s Constitution, any Shareholders Agreement, the transfer instrument, updated registers, and any board/shareholder resolutions.

If you’d like a consultation on your next share sale and purchase agreement, you can reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.