Master v Cameron: Conditional Contracts And Binding Agreements

As a small business owner, you’re often signing documents quickly so you can move on to the real work: serving customers, delivering projects, and growing revenue.

But one of the most common (and costly) contract mistakes we see is assuming a deal is “done” just because you’ve agreed on the key commercial points - price, timing, what’s being supplied - only to find out later that the agreement wasn’t legally binding (or wasn’t binding yet).

That’s exactly where the principles from Master v Cameron come in. It’s one of the most important Australian contract law cases on conditional contracts and “subject to contract” negotiations. If you use quotes, proposals, heads of agreement, term sheets, or sale contracts in your business, understanding the Master v Cameron categories can help you avoid disputes, delays, and unexpected legal risk.

Below, we’ll break down Master v Cameron in plain English, explain the key categories (including an important later development), and show you how to structure your agreements so they match your commercial intention.

What Is Master v Cameron, And Why Does It Matter For Your Business?

Master v Cameron is a High Court of Australia decision that deals with a practical question:

When the parties agree on terms but say the deal is “subject to contract” (or subject to a formal document), are they already legally bound?

This comes up constantly in small business situations, including:

• Buying or selling a business where parties sign a “heads of agreement” and plan to do the long-form sale agreement later
• Commercial leases where you negotiate key terms and then say “subject to lease”
• Major supply arrangements where you accept a price and scope but say “we’ll document it properly later”
• Services work where you want to start work now but finalise the full contract later
• Startup deals involving investors, co-founders, or equity arrangements where a term sheet is signed first

The Master v Cameron principle helps a court decide whether:

• you already have a binding contract,
• you have a binding contract but with some follow-up paperwork still required, or
• there is no contract until the formal document is signed.

And that difference matters because it affects whether you can enforce the deal, walk away, claim damages, or force the other party to complete.

The Master v Cameron Categories (Explained Simply)

Master v Cameron is often summarised into three categories that describe what the parties intended when they used words like “subject to contract” or “subject to formal agreement”.

It’s not about what one party secretly hoped - it’s about what a reasonable person would understand from the words used and the surrounding circumstances.

Category 1: “We’re Bound Now” (And The Formal Contract Is Just Paperwork)

In this category, the parties have agreed on all essential terms and intend to be bound immediately. The later formal document is basically to record the deal more neatly.

What this means for you: you may already be locked in, even if you planned to “get the lawyers to formalise it later”. If the other side breaches, you can generally enforce the agreement.

Common small business example: You and a supplier agree in writing on price, quantity, delivery schedule, and payment terms. You start placing orders. The email says “we’ll put this into a contract next week.” A court may treat this as already binding.

Category 2: “We’re Bound Now, But We’ll Replace It With A Formal Contract”

In this category, the parties intend to be bound immediately, but they also intend that the agreement will later be replaced by a more formal contract (often with fuller terms).

What this means for you: you can still be bound right now. Whether you must continue negotiating or sign a particular long-form contract will depend on what you agreed (expressly or by implication) - for example, some documents include an express obligation to negotiate or use “reasonable endeavours” to finalise the formal contract, while others do not.

Common small business example: A heads of agreement is signed to “lock in” the commercial deal, then a detailed long-form agreement is negotiated afterwards. If the heads of agreement clearly shows an intention to be immediately binding, you may not be able to walk away just because the long-form contract isn’t final yet.

If you regularly use a Heads of Agreement, it’s worth being very deliberate about whether it is intended to be binding, partially binding, or non-binding.

Category 3: “We’re Not Bound Until The Formal Contract Is Signed”

This is often what people mean when they say “subject to contract”. In this category, the parties do not intend to be legally bound unless and until they sign a formal contract.

What this means for you: you may have a commercial understanding, but you do not yet have an enforceable deal. Either party can generally walk away (subject to some important caveats, like misleading conduct or confidentiality obligations).

Common small business example: A business sale is negotiated and both parties sign a short document saying “subject to execution of a formal contract” and “not intended to be legally binding.” The buyer can often pull out before signing the long-form contract.

As a practical rule: if you want Category 3, you need to be consistent - your language, your conduct (e.g., not starting performance), and the document itself should all point to “not binding yet”.

Category 4 (Developed In Later Cases): “We’re Bound To Some Terms Now, But Not Others”

Later cases (commonly associated with GR Securities v Baulkham Hills Private Hospital) recognise a further common situation: a document is intended to be binding in part, even if other parts are still “subject to contract”.

What this means for you: you might be legally bound on certain agreed terms (for example, confidentiality, exclusivity, a deposit, or a process/timetable), even though the main transaction terms are still being negotiated and won’t be binding until a formal contract is signed.

Common small business example: A term sheet says the commercial deal is non-binding, but the confidentiality and exclusivity clauses are “binding and enforceable”. Even if the final deal never proceeds, those binding clauses can still apply.

Conditional Contracts: “Subject To Finance”, “Subject To Due Diligence”, “Subject To Board Approval”

Small business deals are often conditional because there’s a real-world step that must happen before it makes sense to lock the parties in.

Common conditions include:

• Subject to finance: the buyer needs funding approval
• Subject to due diligence: the buyer needs to review financials, contracts, IP, liabilities
• Subject to landlord consent: for an assignment of lease
• Subject to board approval: a company needs director approval
• Subject to a formal contract: lawyers will prepare the final agreement

These conditions are not “bad” - they’re often sensible risk management. The issue is when the condition is unclear, or the document doesn’t explain what happens if the condition is not met.

Are You Already Bound If The Contract Is “Conditional”?

Sometimes, yes. A contract can be binding even if it’s conditional. For example, “subject to finance” might mean:

• you have a binding contract now, but completion only happens if finance is approved, or
• you have no contract at all until finance is approved (less common, but possible depending on drafting).

This is where Master v Cameron becomes very practical: courts look at whether your wording and conduct show a present intention to be bound, or an intention to wait.

If you’re unsure whether your document actually creates a deal, it’s usually a good idea to get it checked before you rely on it - particularly for higher-value transactions. A Contract Review can often identify whether the agreement is truly enforceable, and where the risk sits.

Common Small Business Risk Areas (Where Master v Cameron Shows Up)

Even if you’ve never heard of Master v Cameron, you’ve probably been in a Master v Cameron situation.

1. Quotes, Proposals, And “Acceptance” Emails

Many businesses send a quote and then get an email back saying, “Approved - please proceed.” Depending on what your quote says (and what it includes), that exchange can create a binding contract.

To reduce uncertainty, your quote should be consistent with your intended legal position, for example:

• if you want it binding on acceptance, make that clear and attach/point to your standard terms
• if you do not want it binding until a formal contract is signed, make that clear too

The fundamentals here tie closely to offer and acceptance - if you want a deeper refresher on that concept, the principles in offer and acceptance are often the starting point.

2. Heads Of Agreement And Term Sheets

Heads of agreement and term sheets are useful because they move negotiations forward without the time and cost of a full contract upfront.

But they are also notorious for disputes because parties assume different things, like:

• one party thinks it’s “locked in”
• the other party thinks it’s “just an outline”

To avoid this, you can structure a heads of agreement as:

• fully binding,
• partly binding (e.g., confidentiality and exclusivity are binding, commercial terms are not), or
• non-binding (except maybe specified clauses).

The key is consistency and clarity in drafting.

3. Leases And “Subject To Lease” Negotiations

When you’re securing premises, you might agree on rent, term, outgoings, and incentives, then say “subject to lease.”

If the deal is business-critical (which it often is), you want certainty about when you are committed - especially because you may start spending money (fit-out, hiring, marketing) before the final lease is signed.

Even if you’re not signing the final lease yet, consider documenting:

• whether either party can withdraw and on what basis
• whether you’re allowed early access
• whether you can rely on agreed incentives

4. Business Sales And “Agreed In Principle” Deals

Buying or selling a business often involves “agreed in principle” terms before the formal business sale agreement is finalised.

This is a classic Master v Cameron setting because there are usually:

• multiple conditions (finance, due diligence, landlord consent)
• complex inclusions/exclusions (stock, equipment, IP, employees)
• timing pressures

In these transactions, “we’ll just sign something short for now” can be risky unless it’s carefully drafted to match your intention.

How To Make Sure Your Agreement Matches What You Actually Intend

The best way to use Master v Cameron in your business isn’t to memorise case law - it’s to apply a few practical drafting habits that reduce ambiguity.

Be Clear About Whether You Want To Be Bound

Ask yourself early: do you want a deal now, or do you want to keep negotiating?

• If you want the deal to be binding now, say so plainly (and include the essential terms).
• If you want it to be non-binding until a formal contract, say so plainly (and behave consistently with that).

Clarity is not just legal hygiene - it’s commercial hygiene. It prevents misunderstandings that can damage relationships and delay projects.

Define The Condition Properly (And What Happens If It’s Not Met)

If you use conditions (finance, due diligence, approvals), define:

• who benefits from the condition (is it for the buyer only, or both parties?)
• when it must be satisfied
• what “satisfaction” means (e.g., “approval on terms acceptable to the buyer acting reasonably”)
• what happens if it’s not satisfied (termination rights, deposit refund, cost allocation)

A vague “subject to finance” can create disputes about whether someone genuinely tried to obtain finance, whether they can simply change their mind, and whether they must proceed if finance is offered on different terms.

Don’t Start Performing Unless You’re Comfortable Being Bound

Your conduct matters. If you start work, take payment, order stock, or give access to premises, that behaviour can imply that a contract already exists - even if the paperwork is “still coming”.

If you need to start early, consider an interim document that covers essential protections (scope, fees, IP, liability, termination), then replace it later with the long-form agreement.

Make Sure Your “Essential Terms” Are Covered

Courts generally look for enough certainty to enforce the bargain. For small businesses, “essential terms” often include:

• who the parties are
• what is being supplied (scope/specifications)
• price and payment terms
• timing (start date, delivery milestones, completion)
• key risk terms (termination rights, limitations, warranties)

This is part of what makes a contract enforceable in the first place - the basics in what makes a contract legally binding matter just as much as the “subject to contract” wording.

Use The Right Document For The Job

Different stages of a deal call for different documents. For example:

• Early negotiation: a non-binding heads of agreement with binding confidentiality/exclusivity clauses
• Ready to proceed but need formalisation: a short-form agreement that is binding now, to be replaced later
• Final stage: a tailored long-form contract drafted for the specific transaction

If you’re creating or updating an agreement, good drafting is what turns commercial intention into enforceable rights and obligations. That’s where Contract Drafting can save a lot of time (and dispute risk) later.

Be Careful When Changing Terms Mid-Negotiation

Another common issue: you agree on a deal, then someone emails a “small change”. If the parties keep going without properly documenting the change, you can end up with unclear or conflicting obligations.

If you need to change agreed terms, make sure the variation is documented clearly and signed/accepted properly - the process behind making amendments to contracts is often where small businesses accidentally create uncertainty.

Key Takeaways

• Master v Cameron is a key Australian contract law case that helps determine whether “subject to contract” negotiations are already legally binding.
• The decision outlines three categories: (1) bound immediately, (2) bound immediately but expecting a formal replacement contract, and (3) not bound until the formal contract is signed.
• Later cases also recognise a commonly-used fourth category where a document can be partly binding (for example, confidentiality or exclusivity), even if the main deal remains “subject to contract”.
• A contract can be binding even if it is conditional (e.g., subject to finance or due diligence) depending on the drafting and the parties’ conduct.
• Small business risk commonly arises with quotes, heads of agreement, leases, supply deals, and business sales where parties assume the document is (or isn’t) binding.
• The best protection is clear drafting: state whether it’s binding, define conditions properly, avoid starting performance too early, and document any changes.

If you’d like help structuring a conditional agreement, heads of agreement, or contract terms so they match your commercial goals, you can reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.