Duty To Mitigate Loss In New Zealand Commercial Contracts

Even with the best planning, commercial relationships don’t always go to plan.

A supplier stops delivering. A customer cancels at the last minute. A contractor walks off a job. Suddenly you’re dealing with a loss - and you’re probably asking the practical question: “Can I recover this from the other party?”

In New Zealand, a key concept that can affect what you can recover is the duty to mitigate loss in contract claims. Put simply, if someone else breaches a contract and you suffer a loss, you’ll generally be expected to take reasonable steps to reduce (or avoid making worse) that loss if you want to recover damages for it.

This idea catches a lot of small businesses off guard, because it can feel unfair: “Why should I have to do anything if they’re the one who breached?” But mitigation isn’t about letting the other party off the hook - it’s about keeping losses realistic and commercially sensible. In practice, it usually comes up as an argument raised by the party in breach to reduce the damages payable.

Below, we’ll break down what mitigating loss means in practice for NZ businesses, what “reasonable steps” can look like, how it affects damages claims, and how you can reduce risk with well-drafted contracts.

What Is Mitigating Loss (And Why Does It Matter)?

Mitigation is a legal principle that applies when one party breaches a contract and the other party claims damages.

In plain terms, it means:

• If the other party breaches, you can usually claim compensation for the losses caused by that breach.
• But you can’t just sit back and let the losses pile up if there are reasonable steps you could take to reduce them.
• If you don’t take those reasonable steps, the court (or an arbitrator) may reduce the damages you can recover, to exclude losses that could have been avoided.

This comes up in everyday commercial situations, such as:

• Supply agreements: your supplier fails to deliver stock and you need to source from somewhere else.
• Service arrangements: a contractor abandons work and you need to find someone to finish the job.
• Commercial leases: a tenant stops paying rent and you need to minimise ongoing loss.
• Online sales or B2B orders: a customer cancels an order and you need to resell goods or reallocate resources.

From a business owner’s perspective, mitigation matters because it directly affects:

• What you can recover (and how much).
• How quickly you should act after a breach.
• What evidence you should collect to show your response was reasonable.
• How your contracts should be drafted so expectations are clear from day one.

And importantly: mitigation isn’t about taking any step imaginable. It’s about taking steps that make sense for your business, given time, cost, availability of alternatives, and the information you had at the time.

When Does Mitigation Become Relevant In A Commercial Dispute?

Mitigation usually becomes relevant when:

• there’s a breach of contract (or a repudiation - where the other party indicates they won’t perform), and
• you’re claiming damages (money compensation) for losses flowing from that breach.

It’s not something you “agree to” in the contract - it’s generally part of how contract damages work under New Zealand law, and it often comes up if the breaching party argues that some losses were avoidable.

Common Trigger Points In NZ Business Contracts

Mitigation issues often show up around these moments:

• Delayed performance: you’re waiting on delivery or completion and you must decide whether to source an alternative or keep waiting.
• Termination decisions: you terminate (or consider terminating) and need to manage the fallout properly.
• Replacement decisions: you hire someone else or buy elsewhere, and the question becomes whether that replacement choice was reasonable.
• Ongoing losses: losses continue over weeks or months (for example, lost profits), and you need to show you tried to reduce them.

If you’re considering ending the relationship, it’s worth getting advice early because the way you exit can affect both your rights and your losses. This is where having a clear process in your contract - and following it - really helps. If you’re unsure where to start, having the right termination mechanics documented in a Terminating A Contract clause can make a huge difference when things go sideways.

Mitigation Doesn’t Require You To Take On Unreasonable Risk

A common misconception is that mitigation means you must:

• accept a bad deal to minimise loss,
• keep trading with a party you don’t trust, or
• spend money you can’t afford.

That’s not the standard. The expectation is that you take reasonable steps in the circumstances - not heroic measures, not measures that jeopardise your business, and not measures that only look “obvious” with hindsight.

What Counts As “Reasonable Steps” To Reduce Loss?

“Reasonable” is the key word, and it depends heavily on the context. What’s reasonable for a large importer may not be reasonable for a small café or a growing online retailer.

That said, there are common mitigation steps that come up again and again in commercial disputes.

Examples Of Mitigation Steps That Are Often Expected

• Sourcing an alternative supplier (even if it’s more expensive), where the alternative is readily available and time matters.
• Finding a replacement contractor to finish a job, rather than leaving the work unfinished indefinitely.
• Reallocating staff or resources to other revenue-generating work if a project is cancelled.
• Reselling goods where an order is cancelled and the product is still marketable.
• Stopping avoidable costs (for example, cancelling subcontractor bookings if they’re no longer needed).
• Communicating early with the other party and documenting what you’re doing and why.

Steps That Might Be Unreasonable (Depending On The Situation)

• Buying replacement goods at a wildly inflated price when cheaper alternatives were available within a reasonable timeframe.
• Entering a replacement contract with unfavourable terms that create new risks (for example, unlimited liability) just to act quickly.
• Continuing to incur costs you know you won’t recover, without a good business reason (for example, continuing to order materials for a cancelled job).
• Refusing workable alternatives out of frustration or principle, when a reasonable business would have accepted them.

Mitigation Often Involves Making Fast Decisions - So Document Your Reasoning

In the real world, mitigation decisions are made under pressure.

If you later need to justify your actions, what helps is having a clear paper trail showing:

• when you became aware of the breach,
• what options you considered (quotes, emails, notes of calls),
• why you chose one option over another (timing, quality, availability), and
• what you did to keep losses down.

This is also why your contract “foundation” matters. If you have clear written terms in place, it’s much easier to show what was agreed, what went wrong, and what the consequences should be. Many small businesses build this into their day-to-day paperwork through Terms Of Trade or customer-facing terms.

How Mitigation Affects Damages Claims

When you claim damages for breach of contract, you’re generally trying to be put back in the position you would have been in if the contract had been performed properly (as far as money can do that).

But mitigation can limit damages in a practical way:

• You can usually recover losses that were caused by the breach and weren’t too remote.
• You may not recover losses that could have been avoided with reasonable mitigation steps.

Typical Categories Of Loss Where Mitigation Comes Up

1. Replacement costs
If you have to pay more to replace goods/services due to the breach, that extra cost may be recoverable - but only if the replacement decision was reasonable.

2. Lost profits
If the breach caused you to lose sales or revenue, you may be able to claim lost profits - but you may need to show you tried to keep trading or find alternatives to reduce the hit.

3. Wasted expenditure
If you spent money relying on the contract (materials, marketing, labour), you may seek recovery - but if you could have stopped spending earlier after learning of the breach, mitigation may reduce what you can claim.

4. Ongoing losses
If losses keep accruing (for example, storage fees, continuing overheads), the other side may argue you should have taken steps to stop those costs sooner.

A Quick Scenario (So You Can See It In Action)

Imagine you run an events business and you’ve contracted with a supplier for equipment. Two days before the event, the supplier cancels and says they can’t deliver.

• If you do nothing and the event is cancelled, your customer claims a refund, and you lose significant revenue - you may be criticised for not trying to source alternative equipment.
• If you urgently source replacement equipment at a higher (but market) price, that extra cost is often a classic example of a reasonable mitigation step.
• If you source equipment at an extreme price when other reasonable options existed, you might not recover the full difference.

There’s no one-size-fits-all approach - but the guiding principle is: act like a reasonable business trying to keep losses down, not like a business building a bigger claim.

How Do You Reduce Mitigation Disputes With Better Contract Drafting?

Mitigation arguments usually happen after things go wrong - but good contract drafting can reduce the uncertainty (and the scope for disagreement) upfront.

If you don’t already have properly documented terms, it’s worth putting them in place early, while the relationship is still positive. That might look like a tailored Service Agreement for a key client relationship, or a broader set of customer-facing terms.

Contract Clauses That Can Help Manage Loss And Mitigation

Depending on your business and the type of contract, you may consider clauses that deal with:

• Notice requirements (so you find out about issues early and can mitigate sooner).
• Timeframes and milestones (so it’s clearer when performance is late or defective).
• Termination rights and what happens on termination (handover, partial payment, return of goods).
• Force majeure (to manage genuine disruptions beyond a party’s control).
• Limitation of liability and caps on damages (so exposure is commercially predictable).
• Consequential loss exclusions (carefully drafted, because these are often misunderstood).

It’s common for businesses to try to manage risk through a cap or exclusion, but the wording matters a lot. A well-drafted Limitation Of Liability clause can help set realistic boundaries on what losses can be claimed, which may reduce the intensity of mitigation disputes later.

Make Sure Your Contract Is Actually Enforceable

Mitigation is only relevant if you can first establish that there was a binding contract and a breach.

If your agreements are informal (for example, a few emails and a quote), you might end up arguing about whether you even had a contract, what the terms were, and what the other party promised to do.

It’s why it’s worth making sure your documents cover the basics of contract formation - offer, acceptance, price, scope, timing, and key risk clauses. If you want a quick refresher on the essentials, What Makes A Contract Legally Binding is a useful framework for thinking about it from a practical business perspective.

Don’t Rely On Generic Templates For High-Value Deals

Templates can be tempting when you’re time-poor (and trying to keep costs down). But if a dispute happens, unclear drafting often ends up being far more expensive than doing it properly upfront.

In particular, mitigation-related disputes often turn on grey areas like:

• what the scope actually included,
• whether delays were excused,
• what notice was required before termination, and
• how loss should be measured.

Getting a contract drafted or reviewed for your specific commercial realities is one of the best ways to protect your business from day one.

What Should You Do After A Breach To Protect Your Position?

Once a breach happens, it’s easy to get stuck in the emotions of it (especially if the other party is being difficult). But the businesses that usually come out best are the ones that move quickly, stay organised, and treat it like a risk management exercise.

A Practical Mitigation Checklist For NZ Businesses

If you think you’re dealing with a breach of contract, these steps can help you manage your losses and protect your claim:

1. Confirm the contract terms (scope, timeframes, payment, termination, dispute process).
2. Document the breach (emails, photos, delivery records, invoices, timesheets).
3. Notify the other party promptly and keep communication in writing where possible.
4. Stop avoidable costs (pause purchasing, pause work, cancel bookings where reasonable).
5. Get alternative quotes (replacement suppliers/contractors) so you can show you tested the market.
6. Make a commercially sensible replacement decision and record why it was the best option at the time.
7. Track your losses in a simple spreadsheet (date, cost, description, link to invoice).
8. Get advice early before you terminate, withhold payment, or threaten legal action.

One of the biggest “own goals” we see is a business making a quick decision that feels justified, but accidentally breaches the contract themselves (for example, terminating incorrectly or refusing to pay an undisputed amount). If you’re negotiating an exit or resolution, documenting it properly through a Deed Of Settlement can help you close the issue cleanly and avoid a second dispute later.

Be Careful About “All Or Nothing” Responses

Sometimes mitigation involves doing something you’d prefer not to do - like completing a job with a replacement supplier or offering a substitute product to your customer.

This doesn’t mean you’re accepting the breach or giving up your rights. Often, it’s simply the smart commercial move while you preserve your legal position.

If you’re unsure what you should do next, it’s usually better to pause and get advice before you take an irreversible step.

Key Takeaways

• In New Zealand contract disputes, mitigation generally means you’re expected to take reasonable steps to reduce your losses after the other party breaches a commercial contract.
• You don’t need to take extreme measures - but you also can’t let losses accumulate where practical alternatives exist.
• Mitigation often involves real-world decisions like finding replacement suppliers, rescheduling work, reselling goods, or stopping avoidable costs.
• If you don’t mitigate reasonably, a damages award may be reduced to exclude losses you could have avoided.
• Good contract drafting (clear scope, termination process, liability caps, and dispute clauses) can reduce the risk of mitigation disputes before they happen.
• After a breach, act quickly, document your decisions, and keep records - this can be crucial evidence later.

This article is general information only and isn’t legal advice. If you’d like advice about your specific situation, you should speak with a lawyer.

If you’d like help reviewing your commercial contracts or dealing with a breach, reach us at 0800 002 184 or team@sprintlaw.co.nz for a free, no-obligations chat.