Promissory Notes in Australia: How to Use Them Safely

If a customer, distributor or even a related entity owes your business money, a simple way to lock in repayment is a promissory note. It’s a familiar tool in finance, but many Australian small businesses aren’t clear on when to use it, what to include, or how to enforce it if things go wrong.

In this guide, we’ll explain what a promissory note is, when it fits (and when it doesn’t), the key clauses to include, how to add security or guarantees, and what enforcement looks like under Australian law. Our goal is to help you use promissory notes confidently to protect cash flow while keeping deals practical and fair.

What Is A Promissory Note And When Should A Business Use One?

A promissory note is a written promise by one party (the “maker”) to pay a specific sum to another party (the “payee”) on demand or by a set date. It’s typically simpler than a full loan agreement, but it’s still a binding contract if it clearly records the promise to pay and essential terms.

Australian small businesses commonly use promissory notes to formalise:

• Repayment plans for overdue invoices.
• Short-term advances to suppliers or partners to cover working capital.
• Intercompany or director advances that need clear repayment terms.
• Settlement of commercial disputes where part of the settlement is paid over time.

Think of a promissory note as a lightweight credit instrument. It can sit alongside your usual Business Terms or service agreement, or it can be used as a stand-alone document to capture a payment arrangement.

If you need a refresher on the basics, our overview of Promissory Notes in Australia covers key concepts and common use cases.

Importantly, a promissory note is only as good as the terms inside it and your ability to enforce them. If you want stronger protection (for example, the right to take security over assets), you’ll likely need extra documents as outlined below.

Promissory Note Vs Loan Agreement: Which Is Better For Your Deal?

Both documents record a debt - the difference is detail and protection.

• Promissory note: Short, fast to agree and sign, good for straightforward repayment schedules and smaller sums. Ideal when you know and trust the counterparty or the risk profile is low.
• Loan Agreement: More comprehensive. Useful when you need custom repayment mechanics, representations and warranties, covenants, events of default, security arrangements, and lender protections.

As a rule of thumb, the higher the risk or the larger the amount, the more you’ll benefit from a robust Loan Agreement, sometimes with extra security and guarantees. For lower-risk, short-term arrangements, a well-drafted promissory note can work well and keep costs down.

Also consider context. If you’re settling an overdue account with staged payments, you might pair a promissory note with a Deed of Release and Settlement to close off the dispute while locking in the timetable for repayment.

Key Terms To Include In A Promissory Note

Even though a promissory note is simple by design, it still needs to be clear and enforceable. At minimum, cover these elements:

1) Parties And Amount

Identify the maker and payee (full legal names and ACNs/ABNs if applicable) and state the principal amount in figures and words.

2) Interest

Say whether interest applies, the rate (fixed or variable), how it’s calculated (simple or compounding), and when it accrues (for example, only on default).

3) Payment Terms

Specify whether payment is on demand or by a due date, or set out an instalment schedule with due dates and amounts. If you’re combining this with a Payment Contract or settlement deed, ensure the schedules match.

4) Default And Remedies

Define what counts as default (missed payment, insolvency, breach of other obligations) and what happens next (for example, interest rate increases, acceleration of all amounts, recovery costs). If you intend to charge late payment fees, they should be reasonable and clearly described to avoid being considered a penalty under Australian law.

5) Set-Off And No Deduction

Clarify whether the maker can deduct any amounts they claim you owe from what they must pay. Many lenders include a set-off clause to manage this risk.

6) Assignment

Do you want the right to transfer (assign) the note to another party, such as a debt purchaser? State whether assignment is allowed and whether consent is required.

7) Governing Law And Jurisdiction

Make sure the note is governed by Australian law (typically the state or territory where you and the debtor operate) and include a jurisdiction clause to avoid disputes over forum.

A promissory note can also include acknowledgements (for example, that the maker received value), representations (the maker has power to enter the note), or additional business-specific promises. Keep it tight and focused so it remains easy to agree and enforce.

Do You Need Security Or A Guarantee?

Unsecured promises rely on trust and the debtor’s ongoing financial health. If the amount is material or you want stronger protection, consider adding security or personal support.

Taking Security Over Assets

A security interest gives you rights over specific assets or all present and after-acquired property if the debtor doesn’t pay. This is typically documented by a General Security Agreement (for companies) or a specific security agreement over key equipment or receivables.

To make the security effective against other creditors, you must register it on the Personal Property Securities Register (PPSR) within required timeframes. You can engage us to Register a Security Interest or learn more about why the PPSR matters using our guides on what the PPSR is and why it matters for your business.

Using Personal Guarantees

If the borrower is a company with limited assets, you can ask directors or owners to provide Personal Guarantees. A guarantee means that if the company doesn’t pay, the guarantor is personally liable. Guarantees should be in writing, clear about the guaranteed obligations, and ideally supported by independent legal advice for the guarantor to improve enforceability.

Secured Promissory Note Or Separate Documents?

You can reference security and guarantees inside the promissory note, but in practice it’s cleaner to have the note plus standalone security and guarantee documents. This makes each instrument easier to enforce and register (where required) and avoids cluttering a short note with complex security provisions.

How Do You Enforce A Promissory Note In Australia?

If the debtor misses a payment or otherwise defaults, act promptly and follow a clear escalation path. Here’s a practical roadmap many small businesses use.

1) Check The Terms

Confirm the default is covered by the note or related documents, and calculate the amount due (including any agreed interest or fees). Ensuring your paperwork is consistent with your Business Terms will save time at this stage.

2) Send A Formal Demand

Issue a written demand referencing the promissory note, specifying the default, the amount due, and a deadline to remedy. Keep it factual, professional and consistent with your contract.

3) Negotiate A Short Repayment Plan (If Appropriate)

If the counterparty is cooperative but cash-strapped, a short payment plan can get you paid faster than litigation. When you agree a revised timetable, consider documenting it in a Deed of Settlement or a settlement deed that preserves your rights if the debtor defaults again.

4) Enforce Security Or Guarantees

If you took security, check PPSR registration and your enforcement rights under the security agreement. If you have a personal guarantee, issue demand to the guarantor. Always follow the procedure in your documents and under applicable law.

5) Commence Legal Proceedings

Where negotiation fails, court action may be the next step. Courts can enter judgment for the amount due under a clear promissory note. Having a well-drafted note, up-to-date statements, and properly executed security or guarantees can significantly streamline this process.

At each stage, weigh commercial outcomes against costs. The right option is the one that gets you paid with the least friction and risk.

Common Mistakes To Avoid (And How To Reduce Risk)

Promissory notes can be powerful, but there are pitfalls. Here are issues we regularly see - and how to prevent them.

• Vague repayment terms: Avoid “as soon as possible” or “when able to pay.” Use firm dates, amounts and triggers for default and acceleration.
• Unclear interest and fees: State whether interest applies, the rate and how it’s calculated. If you plan to charge late fees, ensure they’re reasonable and proportionate to actual recovery costs.
• No security or guarantee for material sums: Consider a General Security Agreement and/or director guarantees for larger or higher-risk exposures, and remember to Register a Security Interest on the PPSR.
• Mismatch between documents: If your note references a settlement deed or your standard terms, make sure schedules, dates, and definitions align so there’s no ambiguity.
• Execution errors: Get the right signatories (for companies, ensure correct execution under section 127 or by authorised signatories) and keep clean copies. If in doubt, use our assistance with execution and signing logistics.
• Skipping due diligence on the debtor: A quick search of ASIC records, PPSR, and basic financials can flag risks early. If assets are already encumbered, consider different security or tighter terms.
• Letting delays drift: When a payment is missed, act quickly. Even a short, well-documented variation or a fresh note can put you back in control before issues compound.

If your deal is more complex, consider whether a streamlined Payment Contract or a full Loan Agreement is a better fit, paired with the right security and guarantees.

Key Takeaways

• A promissory note is a simple, binding promise to pay - great for straightforward repayment schedules and short-term finance between trusted parties.
• For larger or higher-risk sums, a comprehensive Loan Agreement plus security and guarantees usually provides stronger protection.
• Cover the essentials: parties, amount, interest, repayment timetable, default events, remedies, set-off, and governing law. Keep the drafting clear and consistent.
• Strengthen your position with a General Security Agreement, director Personal Guarantees, and PPSR registration via Register a Security Interest.
• Enforcement starts with a clear demand. If needed, use a Deed of Settlement for payment plans, or proceed to security enforcement or court action when appropriate.
• Avoid common errors like vague terms, unenforceable fees, execution mistakes, and document mismatches - a little legal help upfront can save significant time and cost later.

If you’d like a consultation on drafting or enforcing a promissory note for your business, you can reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.