Equitable Set-Off: What It Is and When Businesses Can Use It

Cash flow is the lifeblood of any small business, so it’s stressful when an invoice feels unfair because the other side hasn’t done what they promised.

In some situations, Australian law recognises a right called equitable set-off. It lets you reduce or withhold what you owe under one transaction because of a closely connected claim you have against the same counterparty.

Used properly, equitable set-off can be a powerful tool in negotiations and disputes. Used poorly, it can escalate conflict or expose you to interest and legal costs.

In this guide, we’ll explain what equitable set-off is, how it differs from other types of set-off, when you can rely on it, and practical steps to raise or defend it-plus how to draft your contracts to manage set-off risk from day one.

What Is Equitable Set-Off?

Equitable set-off is a defence that operates in equity (the part of law focused on fairness). It allows a party who owes money under a contract to set off part or all of that amount against a closely connected counterclaim they have against the same party.

The classic example is where you’re invoiced for goods or services that are defective or incomplete. If your loss from the defect is sufficiently connected to the invoice, equity may allow you to set off that loss against the price you owe.

Two core ideas underpin equitable set-off:

• There must be a close connection between the amounts (they arise out of the same or closely related transaction); and
• It would be unfair (inequitable) to make you pay the invoice in full without taking the counterclaim into account.

It’s not automatic, and it’s not available just because you have a general complaint. The bar is higher than simply saying “you owe me money too.”

How Is Equitable Set-Off Different From Legal Or Contractual Set-Off?

There are a few ways businesses talk about “set-off,” and they don’t all work the same way.

• Contractual set-off: Your contract expressly allows either party to set off certain amounts. For example, a supplier may reserve a right to deduct unpaid fees from a rebate it owes you. You can (and should) control this with clear drafting and, where appropriate, a set-off clause that suits your commercial risks.
• Legal set-off (procedural set-off): In court proceedings, rules of civil procedure allow parties to set off liquidated (certain) sums against each other. This is narrower and more technical than equitable set-off.
• Equitable set-off: Even if a contract is silent, equity can allow set-off where the counterclaim is closely connected and it would be unfair to enforce payment without accounting for it.

Good contracts reduce surprises. Clear Terms of Trade or a Customer Contract can either enable a sensible set-off right (for both sides) or include a “no set-off” clause where you need certainty of payment.

When Can You Rely On Equitable Set-Off?

Courts have developed tests over time, but a practical way to think about it is:

• Same deal or tightly related: Your claim must arise out of the same transaction (or a very closely linked one). A complaint about an unrelated project or a debt under a different contract usually won’t qualify.
• Fairness matters: There must be real unfairness in making you pay now and argue later. For instance, being forced to pay for seriously defective, unusable goods can be inequitable if the defects and the price are intertwined.
• Not just any grievance: Simple dissatisfaction, minor breaches, or speculative claims rarely justify equitable set-off. You need a genuine, arguable counterclaim that can be quantified.
• Timing and evidence: The closer your counterclaim is to the due date and the clearer your evidence, the more reasonable it is to raise set-off. Delayed or vague allegations weaken the position.

Remember, equitable set-off is discretionary. If you get it wrong and withhold too much, you may face late fees, interest, default consequences or even a breach of contract claim. When in doubt, get advice fast.

Real-World Examples For Small Businesses

1) Defective Goods With A Single Supply Contract

You buy 500 units of branded merchandise under a single purchase order. When they arrive, 30% are defective and unsellable. The supplier invoices for the full amount.

Because the defect losses and the invoice arise from the same transaction, you may be able to equitably set off the value of the defective units against the invoice, especially if the contract lacks a workable warranty process or the supplier refuses to replace them promptly.

2) Services With Material Shortfalls

Your digital agency engages a freelancer under one Statement of Work to deliver a website build and monthly support. The freelancer invoices the full project price, but core features were not delivered and you had to pay another developer to complete them.

Those completion costs may be closely connected to the same project and capable of equitable set-off against the unpaid invoice, provided your evidence is strong (scope, milestones, quality standards, remediation attempts).

3) Construction Progress Payments

A subcontractor claims a progress payment, but there are serious defects in the same stage of work that will require rework. In some contexts, equitable set-off can apply-however, be cautious: security of payment legislation (which varies by state) can limit set-off in adjudication. Seek tailored advice before withholding.

4) Unrelated Debts Between The Same Parties

You owe a supplier for a 2024 order but they still owe you a rebate from an unrelated 2022 campaign governed by a different agreement. That connection may be too remote for equitable set-off. You might instead negotiate or rely on a contractual set-off (if the contract allows), or pursue separate recovery.

How To Raise (Or Defend) An Equitable Set-Off Claim

Handled well, set-off can defuse a dispute. Handled poorly, it can tip a commercial relationship over the edge. Here’s a practical approach.

Step 1: Check The Contract

Start by reading the contract. Does it include a set-off right, a “no set-off” clause, or a dispute resolution process?

Contractual wording often decides the strategy. If your documents are silent or unclear, equitable set-off may fill the gap-if the facts support it. If the documents are out of date, consider whether a formal variation is needed; if so, follow the proper process, as informal changes can create confusion. If you need to alter terms to manage risk going forward, get across what a valid variation looks like under Australian law by reviewing how contract amendments work.

Step 2: Gather Evidence And Quantify The Claim

Document the problem and the cost to fix it:

• Purchase orders, scopes of work, delivery notes and emails
• Photos, test reports, expert opinions, time sheets
• Independent quotes to rectify or replace
• Reasonable calculations linking the loss to the specific invoice

Be realistic. Inflated or speculative figures damage credibility.

Step 3: Communicate Early And Clearly

Write to the other party before the due date if possible. Explain the issue, identify the relevant invoice(s), set out your counterclaim and how you’ve calculated the amount you intend to set off, and invite a prompt discussion or remediation plan.

Stay professional and solution-focused. Offer inspection or a joint review. If the relationship is valuable, consider a short-term compromise while you investigate (for example, pay undisputed amounts now, hold the balance in the meantime).

Step 4: Follow Any Dispute Resolution Process

If your contract includes a tiered process (negotiation, mediation, arbitration), follow it. Courts expect parties to comply with agreed procedures. A well-drafted Terms of Trade or services agreement should guide this path.

Step 5: Consider Settlement

Many set-off disputes settle commercially. If you reach a compromise, record it in writing. For larger or sensitive matters, a formal Deed of Release and Settlement can give both sides finality and prevent the dispute from resurfacing later.

Step 6: Escalate Carefully

If negotiations fail, get advice on your options. Commencing or defending a claim may involve pleading equitable set-off, breach, or other remedies. Your strategy should weigh legal merits, evidence, costs and commercial relationships. If you’re on the receiving end of a set-off you consider improper, you may push for payment of undisputed sums and reserve rights to recover the rest.

Drafting Your Contracts: Set-Off, No Set-Off And Unfair Contract Terms

Disputes about set-off often trace back to vague or one-sided contracts. Tight drafting reduces risk and gives you more control.

Decide Your Default Position

Ask yourself what you need commercially:

• If cash certainty is critical (e.g. you extend credit, carry inventory, or have thin margins), consider a “no set-off” clause so invoices must be paid in full and disputes are handled separately.
• If you sell complex or staged services where issues are discovered mid-project, a fair, balanced set-off right might actually support the relationship and avoid escalation.

There’s no one-size-fits-all answer. Your approach may differ for wholesale customers versus small one-off retail clients, or for subcontractors versus end customers.

Use Clear, Balanced Wording

Whether you allow set-off or exclude it, be explicit. Good clauses define:

• Which amounts can be set off (e.g. amounts that are due and payable, or liquidated and not genuinely disputed)
• Any caps or conditions (notice requirements, supporting evidence, timeframes)
• The process for resolving disagreements about the set-off

Well-structured contracts-such as a tailored Customer Contract or robust Terms of Trade-make expectations clear and support faster resolution if issues arise.

Watch Out For Unfair Contract Terms (ACL)

The Australian Consumer Law (ACL) prohibits unfair contract terms in standard form contracts with small businesses and consumers. Heavy-handed set-off or “no set-off” clauses may be at risk if they create a significant imbalance, aren’t reasonably necessary to protect your legitimate interests, and would cause detriment if relied on.

Penalties for unfair terms have increased significantly. If you use standard terms with small business customers or suppliers, it’s prudent to review them-especially any set-off, indemnity, termination and limitation of liability clauses. A focused UCT review and redraft can help reduce enforcement risk while preserving your commercial protections.

Align Set-Off With Other Protections

Set-off interacts with other contract mechanisms. Common examples include:

• Warranties/defects regimes: Clear timeframes and remedies reduce disputes and the need for ad hoc set-off.
• Milestones and acceptance testing: Tying payments to acceptance reduces arguments about paying for incomplete work.
• Suspension/termination rights: Sensible rights help manage non-payment without relying solely on set-off.
• Variations and change control: A structured process prevents scope creep claims that often sit behind set-off disputes.

If your current documents are light on these areas-or use generic templates-consider a targeted refresh. This can be as simple as adding a fit-for-purpose set-off provision through Clause Drafting, or as comprehensive as a full contract review across your customer and supplier terms.

Common Pitfalls To Avoid

• Withholding too much: If you overreach, you risk default consequences, interest or damages. Anchor your figure in solid evidence and pay undisputed amounts promptly.
• Mixing unrelated claims: Equitable set-off requires a close connection. Unrelated debts usually belong in a separate claim or negotiation.
• Ignoring clear contract terms: If your contract has a “no set-off” clause, you’re fighting uphill. Conversely, if it allows set-off subject to conditions, follow those conditions closely.
• Letting issues fester: Raise problems early and in writing. Silence can be read as acceptance.
• Relying on verbal side deals: If you agree to vary payment terms or remedies, confirm it in writing. If a formal variation is required, complete it correctly to avoid later disputes about what was agreed.

Equitable Set-Off In Negotiations And Disputes

Even if a dispute never reaches court, the principles behind equitable set-off can shape commercial outcomes.

When leveraged transparently, set-off can:

• Encourage a supplier to remediate defects quickly
• Support a part-payment proposal that preserves a relationship while issues are resolved
• Frame a settlement that trades payment certainty for concessions (e.g. warranty extensions, credits, priority support)

When defending against set-off, focus on contract terms, the connection (or lack of it), and the quality of the other party’s evidence. Offer practical solutions where appropriate (replacement, rework, credit), and press for payment of undisputed amounts to reduce cash flow strain while the rest is worked through.

Key Takeaways

• Equitable set-off lets you reduce or withhold payment where your counterclaim is closely connected to the same transaction and it would be unfair to pay without accounting for it.
• It’s different from contractual set-off (created by your agreement) and legal set-off (a procedural court tool). Your contract wording often determines the best strategy.
• To use equitable set-off, move early, document the problem, quantify your loss realistically and communicate clearly. Pay undisputed amounts to minimise risk.
• Strong, tailored contracts-like clear Terms of Trade or a Customer Contract-help you manage set-off risk through fair set-off rights, “no set-off” clauses, and robust warranty and dispute processes.
• Beware the ACL’s unfair contract terms regime. Review standard terms so your set-off provisions protect your interests without being unenforceable or risky.
• If a dispute escalates, consider commercial settlement (ideally documented in a Deed of Release and Settlement) or seek advice on breach and equitable set-off claims.

If you’d like help drafting set-off provisions, updating your Terms of Trade, or assessing an equitable set-off dispute, you can reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.