Are Handshake Agreements Legally Binding? Verbal Contracts In Australia

When you’re building a startup or running a small business, things move fast. You might meet a supplier at an event, negotiate a referral deal over coffee, or agree on a quick project scope during a phone call. Everyone’s excited, you shake hands, and you get back to work.

But later, the questions start: what exactly did we agree to? Is the price fixed or “indicative”? Who owns the work product? What happens if a deadline slips? And most importantly - are handshake agreements actually legally binding in Australia?

The short answer is: they can be. A handshake agreement (often a verbal agreement) can form a valid contract if the legal elements are there. The longer answer is that even if it’s enforceable, it can be harder to prove, harder to enforce, and riskier for your business than most founders realise.

Below, we’ll walk you through how handshake agreements work under Australian contract law, when they tend to cause problems, and the practical steps you can take to protect your business without killing momentum.

What Is A Handshake Agreement (And When Does It Become A Contract)?

A handshake agreement is an informal deal where the parties agree verbally (or by conduct) without signing a formal written contract. It might literally involve a handshake, but more commonly it looks like:

• a verbal “yes” in a meeting
• a phone call where you agree on price and delivery
• a quick DM exchange that ends with “done” or “sounds good”
• starting work based on a quote or informal conversation

In Australia, a handshake agreement can become a legally binding contract if the standard elements of a contract exist. In plain English, courts generally look for:

• Offer: one party makes a clear proposal (for example, “We’ll build your website for $12,000, delivery in 6 weeks.”)
• Acceptance: the other party clearly accepts that offer (for example, “Yes, let’s do it.”)
• Consideration: something of value is exchanged (usually money for goods/services, but it can include other value)
• Intention to create legal relations: the parties intended the agreement to have legal effect (commercial deals usually satisfy this)
• Certainty: the terms are sufficiently clear (you can’t enforce a deal if no one can tell what was agreed)

This aligns with basic Australian contract principles around offer and acceptance. The tricky part for startups isn’t usually whether contracts can be verbal - it’s whether your particular handshake agreement is clear enough and provable enough to rely on when something goes wrong.

Are Verbal Deals Legally Binding In Australia?

Generally, yes - verbal deals can be legally binding in Australia, and many commercial arrangements don’t need to be in writing to take effect.

That said, there are important exceptions where the law can require a document, a signature, or other formalities (for example, some dealings involving land, certain guarantees, and other regulated transactions). Even where writing isn’t strictly required, having a written agreement can make the deal far easier to manage and enforce.

In practice, there are a few reasons why handshake agreements can be risky for small businesses:

1. Proof Becomes The Biggest Problem

Even if you had a valid contract, you may need to prove:

• what the terms were
• who said what
• whether you agreed to key points (price, timing, scope, ownership, liability)

If the other party disputes the agreement, it can come down to one person’s word against another’s - and that can be expensive, time-consuming, and uncertain.

2. “We Agreed In Principle” Often Isn’t A Deal

In the startup world, people frequently say things like:

• “Let’s do it”
• “We’re aligned”
• “We’ll sort out the details later”

If essential terms are missing or too vague, the agreement may be too uncertain to enforce. That’s especially common for collaboration and build agreements (software development, marketing retainers, distribution partnerships) where scope and responsibilities matter.

3. Some Transactions Need Formalities (Or Are Too Complex To Leave Informal)

While many commercial contracts can be verbal, some arrangements are subject to specific legal requirements or are simply too complex to safely manage without proper documentation (for example, major asset deals, complex finance arrangements, or transactions that require registrations or statutory forms).

Even where writing isn’t strictly required, your insurer, bank, investor, or future buyer may expect written contracts as part of your governance and risk management.

If you’re unsure whether your deal should be documented more formally, it’s usually a sign you should move away from a handshake agreement and into something clearer.

Common Handshake Agreement Scenarios That Create Legal Risk For Small Businesses

Handshake agreements happen in every industry, but certain scenarios tend to create the most pain for startups and small businesses.

Pricing And Scope Blowouts (Especially For Services)

You agree on a project fee verbally. Halfway through, the client expects extra deliverables, or you realise the project is bigger than expected. Without a written scope and variation process, it can be hard to charge for additional work or defend your position if there’s a dispute.

This is where a proper customer contract (or at least solid written terms) helps define what’s included, what’s excluded, and how changes are handled. Many businesses formalise this through Service Agreement style terms.

“Handshake Partnerships” Between Co-Founders

A very common startup story: two or three founders start building, agree to “split it 50/50”, and focus on product and growth. Months later, someone contributes less, wants to exit, or there’s a disagreement about decision-making.

If you’re operating on a handshake agreement about ownership or roles, you’re exposed to:

• deadlocks (no one can make decisions)
• disputes about equity, IP ownership, and responsibilities
• messy exits that damage the business right when you need stability

This is usually where a written Shareholders Agreement (or founder agreement, depending on structure) becomes critical.

Supplier And Manufacturing Deals Without Clear Delivery Terms

If you agree verbally with a supplier about pricing and delivery dates, what happens if:

• the delivery is late and you lose customers?
• the products are defective?
• you need to cancel or change quantities?

Without clear written terms, your leverage can be limited and your ability to recover losses may be harder.

IP Ownership And “Who Owns The Work?” Disputes

Startups often rely on contractors: developers, designers, marketers, photographers, videographers. A handshake agreement might cover price and deadlines, but not intellectual property.

If you don’t deal with IP ownership clearly, you can end up in a situation where:

• your contractor owns the code/design and only licenses it to you
• you can’t confidently sell the business or raise funds because ownership is unclear
• you can’t stop reuse of your brand assets or product designs

These issues are often avoidable with a properly drafted agreement that clearly addresses ownership, licences, moral rights (where relevant), and handover requirements.

Employment Arrangements That Start “Informally”

Some small businesses begin with casual or part-time arrangements agreed verbally (“Come in Monday to Friday, we’ll pay you $X”). Even if things start friendly, misunderstandings about pay, duties, notice, and confidentiality can escalate.

Written Employment Contract terms help you set expectations and reduce disputes as your team grows.

How Courts Assess A Handshake Agreement (And What Evidence Matters)

If a dispute ends up being negotiated formally (or escalates), the question usually becomes: can you prove the terms and show there was a contract?

Courts and lawyers often look beyond the “handshake” and examine all surrounding evidence, such as:

• Emails and messages confirming price, scope, dates, or key obligations
• Quotes and invoices (and whether they were accepted)
• Purchase orders and delivery notes
• Draft agreements exchanged, even if not signed
• Conduct (for example, one party paid a deposit and the other started work)
• Meeting notes kept by one or both parties

This is why small businesses sometimes assume they’re “safe” because they have messages - but if those messages are incomplete or contradictory, the dispute can still be messy.

What If The Agreement Was “Subject To Contract”?

If you’ve said (or written) that the deal is “subject to contract” or “subject to signing”, that often signals that you do not intend to be legally bound until the formal contract is signed.

That can be useful if you genuinely want to keep negotiations open. But it can also cause problems if you start work before anything is finalised - because you may do work without having enforceable payment terms or protections in place.

If you want to move fast, a practical approach is to use a short-form agreement (or heads of agreement) with the key commercial terms, then follow with a longer contract later.

How To Protect Your Business Without Slowing Deals Down

You don’t need to turn every conversation into a 30-page contract. But you do want to reduce the risk that a handshake agreement becomes a costly dispute.

Here are practical, startup-friendly steps you can take.

1. Confirm The Deal In Writing (Even If It’s Just An Email)

After a verbal agreement, send a short confirmation message. For example:

• what is being delivered
• price (and whether it’s GST-inclusive or GST-exclusive, where relevant)
• key dates (start date, milestones, completion)
• payment terms (deposit, progress payments, due dates)
• any critical assumptions or exclusions

This isn’t about being “legalistic” - it’s about reducing misunderstandings while everyone is still aligned. (If you’re unsure how GST applies to your pricing, it’s worth getting tax advice specific to your situation.)

2. Use Clear Terms For Common Transactions

For many small businesses, the same types of deals happen repeatedly (client onboarding, supply orders, subscriptions, retainers). This is where standardised terms can save time.

Depending on your business model, that might look like:

• standard customer terms for services
• online terms for eCommerce
• subscription terms for SaaS
• supply or distribution terms for wholesale

Having something ready means you’re less tempted to rely on handshake agreements when you’re busy.

3. Put IP Ownership In Writing Every Time

If someone is creating something for your business (code, designs, content, branding), get the IP position clear in writing before work starts.

If IP is central to your startup’s value, it’s also worth doing an early check on brand protection and trade marks. Many founders only think about this after a dispute - or after someone else registers a similar name.

4. Make Sure Your Consumer-Facing Promises Match Your Legal Terms

If you sell products or services to customers, your informal sales promises should line up with your policies and legal obligations, especially under the Australian Consumer Law (ACL).

If you’re offering “no refunds”, extended warranties, or strict cancellation fees, those areas can be legally sensitive. It’s worth pressure-testing your approach against consumer law expectations like consumer guarantees and how you communicate them.

5. Don’t Forget Privacy If You’re Moving Fast Online

Handshake agreements often happen alongside quick launches - landing pages, waitlists, email marketing, and online checkouts.

If you’re collecting personal information (even just names and emails), it’s important to have a Privacy Policy that reflects what you actually do with that data.

6. For High-Value Deals, Don’t Rely On Trust Alone

Trust is great. But trust and documentation work best together - especially when:

• the deal value is high
• you’re committing to long-term exclusivity
• you’re giving access to confidential information
• you’re hiring staff or engaging key contractors
• your reputation depends on delivery timelines

In these cases, a written agreement isn’t overkill - it’s part of running a well-managed business.

Key Takeaways

• A handshake agreement can be legally binding in Australia if the key contract elements are present (offer, acceptance, consideration, intention, and certainty).
• The biggest risk with verbal deals isn’t always whether they’re valid - it’s whether you can prove the terms and enforce them if there’s a dispute.
• Handshake agreements commonly cause issues for startups around scope and price, co-founder arrangements, supplier delivery, and IP ownership.
• Even a short written confirmation (like an email recap) can significantly reduce misunderstandings and strengthen your position.
• Having the right documents ready - like a Service Agreement, Shareholders Agreement, Employment Contract, and Privacy Policy - helps you move quickly without taking on unnecessary legal risk.

If you’d like help turning informal deals into clear, business-friendly agreements (or reviewing whether a handshake agreement has created legal obligations), you can reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.