Lock-Out Agreements In Contract Law (Australia): What They Are And How To Use Them

When you’re negotiating a big deal - like buying a business, selling assets, raising capital or signing a major supply arrangement - the last thing you want is the other side quietly shopping the deal around while you invest time and money.

That’s where a lock-out agreement comes in. It can give you a short, exclusive window to negotiate without competition, so you can focus on getting the main contract right.

In this guide, we’ll explain what a lock-out agreement is, when to use one, how binding it is in Australia, the key clauses to include, and the practical steps to put one in place confidently.

What Is A Lock-Out Agreement?

A lock-out agreement (sometimes called an exclusivity agreement or “no shop” agreement) is a short, standalone contract that gives one party exclusive rights to negotiate a deal for a set period.

In simple terms: one party agrees not to negotiate with anyone else for a limited time, and in return, the other party usually provides something of value - often committing to progress the deal quickly, providing information, or paying a small exclusivity fee.

Lock-out agreements are often used alongside a preliminary document like a term sheet or heads of agreement. The lock-out doesn’t force the parties to complete the final deal - it just stops competing negotiations while you try to agree the main terms.

It’s helpful to distinguish a lock-out agreement from other early-stage documents:

• Lock-out agreement: provides exclusive negotiation rights for a time.
• Term sheet: sets out key commercial terms you aim to include in a final contract.
• Heads of Agreement: similar to a term sheet; can include both binding and non-binding clauses.
• NDA (non-disclosure agreement): protects confidential information during discussions.

If you’re weighing up whether you need a separate lock-out, it can help to compare it with general exclusivity agreements - the concepts overlap, but a dedicated lock-out can be more focused and easier to enforce.

When Should You Use One (And What Are The Pros And Cons)?

Lock-outs are most common when the buyer (or investor) needs time and confidence to proceed with diligence and final negotiations - without the fear of being gazumped. Typical scenarios include:

• Buying or selling a business (or part of it) while you negotiate the main Business Sale Agreement and run financial, legal and operational checks.
• Raising capital, where an investor wants an exclusive window to finalise terms after reviewing the company’s data room.
• Major supply or distribution deals that will take time to price, assess risk and negotiate.

Key benefits:

• Focus and momentum: both sides can concentrate on a single negotiation path.
• Protect your investment of time and cost: you’re less likely to be used as a “stalking horse.”
• Clear timeline: the exclusivity period encourages quick decisions and a shared plan.

Potential downsides to weigh up:

• Opportunity cost for the seller: you can’t talk to other parties during the lock-out, which might reduce competitive tension.
• False security for the buyer: a lock-out doesn’t guarantee the final deal will be signed. It just stops competing negotiations for a limited time.
• Complexity creep: if the lock-out is drafted too broadly or for too long, it can slow a process rather than speed it up.

In business sales, a lock-out usually goes hand-in-hand with a focused legal due diligence plan, so everyone knows exactly what must be checked before signing the main contract. That clarity helps keep the exclusivity period short and productive.

Are Lock-Out Agreements Legally Binding In Australia?

Yes - a lock-out agreement can be binding if it’s drafted properly. Under Australian contract law, you generally need clear terms, an intention to create legal relations and consideration (something of value given by each party).

For lock-outs, “consideration” is often the buyer’s promise to proceed diligently, cover certain costs, or pay an exclusivity fee, while the seller promises exclusivity for the lock-out period and to share information promptly.

What Makes A Lock-Out Enforceable?

• Clear exclusivity promise: the seller agrees not to solicit or negotiate with other parties for the defined period.
• Defined period: a start date and end date (or specific trigger to end the period).
• Scope: which assets, shares or transaction are covered; whether it extends to affiliates or advisers.
• Consideration: mutual promises and/or an exclusivity fee.
• Binding language: clauses such as confidentiality, costs, governing law and remedies are expressly binding.

Sometimes, parties choose to sign the lock-out as a deed rather than an agreement. A deed can help in situations where consideration is uncertain. If you’re deciding which route is right, it’s worth understanding what a deed is under Australian law.

Does A Lock-Out Force The Final Deal?

No. A lock-out usually doesn’t promise that the main contract will be signed. At most, it may include a requirement to negotiate in good faith, which can be tricky to enforce by itself.

If a party walks away within the lock-out period, your recourse is usually limited to what the lock-out sets out (for example, keeping an exclusivity fee or recovering defined “wasted costs”). If they breach the exclusivity promise (for example, by negotiating with someone else), you may have a standard breach of contract claim - again, the result depends on how the lock-out is drafted.

Electronic Signatures And Execution

Lock-out agreements can typically be signed electronically, but execution should still follow Australian requirements. For companies, consider whether execution will rely on Corporations Act section 127 for certainty. If you’re signing remotely, be mindful of the rules around electronic versus wet-ink signatures so there’s no doubt about validity.

Key Clauses To Include (With Examples)

Every deal is different, but most lock-out agreements cover the following areas.

1) Exclusivity Promise

Make the “no shop/no talk” obligation explicit. For example: the seller will not solicit, discuss or negotiate any competing transaction relating to the business with any third party during the exclusivity period.

2) Exclusivity Period

Set a defined start and end date. Many deals use 20-60 days, depending on complexity and how much information is ready to go. Include whether the period can be extended (and how) if diligence is nearly complete but requires a short extension.

3) Process Commitments

To keep momentum, add commitments such as:

• Providing a complete due diligence data room within a set timeframe.
• Senior decision-makers meeting regularly to resolve issues.
• Reasonable access to premises, key staff or accountants (as appropriate).

4) Confidentiality

You can include a confidentiality clause in the lock-out itself, or rely on a separate Non-Disclosure Agreement already in place. The key is to ensure anything shared during the exclusivity period remains protected.

5) Costs And Break Fees

Decide who pays what. Common approaches include each party bearing its own costs, or the buyer paying a small exclusivity fee (which may be refundable if the seller breaches exclusivity). Some deals include an agreed “wasted costs” reimbursement if a party breaches the lock-out.

6) Good Faith And Deal Documents

Some parties include a good faith negotiation clause or a timetable to reach a preliminary document (for example, a Term Sheet or Heads of Agreement) followed by drafting the long-form contract (for example, a Business Sale Agreement).

7) Carve-Outs And Compliance

It’s normal to include carve-outs so a seller can respond to unsolicited approaches that are required for compliance purposes (for example, to respond to a regulator or court order). If that happens, the seller should usually notify the buyer promptly, share only what’s legally required and reaffirm exclusivity.

8) Remedies For Breach

Spell out consequences clearly, such as keeping the exclusivity fee, a pre-agreed costs reimbursement, or the right to seek an injunction to stop competing negotiations during the exclusivity period (where appropriate).

How To Put A Lock-Out Agreement In Place

Setting up a lock-out is straightforward if you follow a clear process. Here’s a practical roadmap:

Step 1: Agree The Scope Of The Deal

Be clear on what you’re negotiating (for example, share sale vs asset sale; which assets; any debt assumptions). A short email or checklist between the parties can help avoid scope creep later.

Step 2: Set A Realistic Exclusivity Period

Work backwards from what you must achieve before signing the main contract. If you need financial diligence, legal reviews and site visits, plan your timeline around those tasks so the period is tight but achievable.

Step 3: Confirm Your Information Strategy

Decide what will be shared and when. Make sure you have a signed NDA in place before uploading sensitive documents to a data room. If you’re the seller, prepare a clean pack to avoid delays.

Step 4: Draft The Lock-Out Document

Base it around the clauses above, using clear, plain-English terms. If there’s a fee, define how and when it’s paid and whether it’s refundable in certain circumstances (for example, if the seller breaches exclusivity).

Step 5: Confirm Execution Method

Decide whether to sign as an agreement supported by consideration, or execute as a deed. Then organise execution (for companies, many choose to rely on section 127 for ease of proof). If signing electronically, align with your counterpart on the platform and process so signatures are valid and traceable.

Step 6: Keep Momentum

Once signed, treat the timetable as a project plan. Lock in your diligence sessions and aim to move quickly to your preliminary document (such as a Heads of Agreement or Term Sheet) and then the long-form contract. Many teams find it useful to track issues in a shared list so they don’t derail the deadline.

Step 7: Prepare The Final Contract

Use the exclusivity window to settle the main document - for example, a Business Sale Agreement for a business sale - while legal and financial teams complete their final checks. This approach minimises the risk of the lock-out ending without a signed outcome.

Practical Tips

• Make your exclusivity period long enough to be useful, but short enough to maintain urgency.
• Schedule standing check-ins (for example, twice weekly) so issues are raised early.
• Use a simple table of deliverables (who, what, when) in an annexure to the lock-out - it keeps everyone aligned.

Key Takeaways

• A lock-out agreement gives you exclusive rights to negotiate a deal in Australia for a defined period, helping you invest in diligence without competing bidders.
• It’s binding if drafted properly - with a clear exclusivity promise, defined period, scope, and consideration - but it doesn’t force the final deal to be signed.
• Stronger lock-outs include process commitments, confidentiality (or a separate NDA), clear costs/break fee terms, and defined remedies for breach.
• Use a realistic timetable and pair your lock-out with focused due diligence and the right preliminary documents (such as a Heads of Agreement or Term Sheet) to maintain momentum.
• Execution matters: consider using Corporations Act section 127 for company execution and be clear on electronic signature rules to avoid disputes.
• If exclusivity is breached, your options typically come from the lock-out terms themselves and general breach of contract principles, so put real thought into remedies at the drafting stage.

If you’d like a consultation on preparing or reviewing a lock-out agreement for your deal, you can reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.