Good Faith in New Zealand Contract Law: What Businesses Must Know

Good faith sounds simple, be honest, be fair, do what you promised. But in commercial contracts, that idea can become messy very quickly. New Zealand business owners often assume good faith is always implied in every contract, rely on broad relationship language instead of clear clauses, or accept standard terms without a proper contract review to check whether one party has wide discretion to act in its own interests. Those mistakes can create real problems before you sign a contract, before you rely on a verbal promise, or before you spend money on setup based on a deal that is not as balanced as it first looked.

For founders and SMEs, the key question is not just whether good faith exists in theory. The practical question is how New Zealand courts treat good faith obligations, when those duties may be implied, and what your contract should actually say if you want fair dealing, cooperation, honesty, or limits on opportunistic behaviour. This guide explains what good faith in contract law means for New Zealand businesses, where the risks usually sit, and what to check before you sign.

Overview

Good faith is not a magic phrase that fixes a poor contract. In New Zealand, the duty to act in good faith may arise in some contexts, but businesses should not assume every commercial agreement includes a broad, free-standing obligation of fairness.

The safest approach is to treat good faith as a drafting issue and a risk issue. If your deal depends on trust, cooperation, information sharing, discretion, exclusivity, renewals, pricing adjustments, or termination rights, the contract should deal with those points clearly.

• Do not assume good faith automatically overrides harsh or one-sided contract wording.
• Check whether one party has discretion over price, approvals, supply, termination, extensions, or performance standards.
• Make sure key promises are written into the agreement, not left as pre-contract statements or verbal understandings.
• Use express clauses if the relationship depends on honesty, cooperation, reasonableness, consultation, or fair dealing.
• Review how good faith interacts with termination rights, dispute processes, confidentiality, exclusivity, and performance obligations.
• Check related risks under the Fair Trading Act 1986 if sales discussions or contract negotiations included misleading statements.

What Good Faith in Contract Law Means For New Zealand Businesses

For most New Zealand businesses, good faith means the contract and the surrounding legal context may require parties to act honestly and not undermine the bargain, but the scope of that duty depends heavily on the agreement and the relationship.

New Zealand law does not treat good faith as a simple universal rule that applies in exactly the same way to every contract. Courts may recognise duties of honesty, cooperation, reasonableness, or fidelity to the bargain in particular situations. Some relationships, such as employment, franchise-style arrangements, long term collaborative deals, or contracts where one party has significant discretionary power, may attract stronger arguments that good faith matters.

That said, courts are usually cautious about rewriting commercial bargains after the fact. If sophisticated parties agreed to clear written terms, a court will generally start with those terms. This is why founders often get caught when they rely on what they thought was a “reasonable expectation” instead of checking what the contract actually allows.

Good faith is not the same as general fairness

A common misunderstanding is that good faith means both parties must always act in a way that is broadly fair to each other. That is too wide. In business contracts, each side is generally still allowed to protect its own commercial interests.

The real issue is whether a party acted dishonestly, exercised a power for an improper purpose, failed to cooperate where cooperation was needed to make the contract work, or acted in a way that destroys the value of the agreement for the other side. Good faith does not usually require a business to give up a negotiated advantage just because the other party later regrets the deal.

When good faith may matter most

Good faith tends to become more important where the contract leaves room for judgment, discretion, or ongoing cooperation. That often happens in supply, distribution, service, technology, construction, and outsourcing agreements.

Examples include:

• a supplier can change prices using a broad review mechanism
• a customer can reject deliverables based on subjective satisfaction criteria
• one party controls approvals, milestones, renewals, or extension options
• a platform provider can suspend services under standard terms
• a distributor must meet targets but depends on the principal for stock or support
• parties are negotiating final details after signing a framework agreement

In each of these situations, the contract may give one party a power that can be used sensibly or opportunistically. That is where express good faith wording, reasonableness standards, consultation obligations, and clear decision criteria can make a big difference.

Express good faith clauses

If good faith really matters to your deal, say so. An express clause can require one or both parties to act in good faith, reasonably, honestly, or cooperatively in defined parts of the relationship.

The wording matters. A vague statement that parties will act “in good faith at all times” sounds helpful, but it can create uncertainty if the rest of the agreement points in a different direction. Better contract drafting usually links the obligation to specific decisions or processes, such as variations, approvals, dispute discussions, information sharing, exclusive supply arrangements, or performance review meetings.

A stronger clause may also define what good faith includes, such as:

• acting honestly and not knowingly misleading the other party
• considering requests genuinely and within a set timeframe
• not exercising discretion arbitrarily or for an unrelated purpose
• providing information needed for the other side to perform
• meeting and discussing issues before termination in limited situations

This kind of drafting gives the clause practical value and makes disputes easier to assess.

Implied duties and the limits of implication

Sometimes a contract does not mention good faith, but a party still argues that a duty should be implied. New Zealand courts can imply terms in some cases, but not just because a result seems fair. The threshold is usually tied to business necessity, obviousness, or the overall structure of the bargain.

For a business owner, the lesson is simple. Do not assume a court will rescue a weak contract by implying a broad duty of good faith. If a point matters commercially, write it down before you sign.

Good faith and pre-contract conduct

Good faith issues do not always start after the contract is signed. Problems often begin during negotiations. One side may make reassuring statements about pricing, timing, exclusivity, support, expected volumes, software capability, or future territory rights, but those statements never make it into the final agreement.

If the written contract later says the opposite, or gives one side broad discretion, the business that relied on those statements may struggle. There may still be issues under the Fair Trading Act 1986 if representations were misleading, but that is not the same thing as a general good faith claim. The safer move is to make sure the final agreement reflects the real deal.

Legal Issues To Check Before You Sign

Before you sign, focus on the contract mechanics that create unfair outcomes in practice. Good faith disputes usually come from a small number of pressure points, not abstract legal theory.

Discretion clauses

If the other party can make decisions that affect price, scope, access, approval, supply, renewal, or suspension, review that power closely. A very broad discretion can leave you exposed even if the relationship sounds collaborative.

Check:

• what decisions the party can make unilaterally
• whether the discretion must be exercised reasonably, in good faith, or for a stated purpose
• whether notice or consultation is required first
• whether there is a review or dispute process if you disagree

Termination rights

Termination is where good faith arguments often become expensive. A contract may allow termination for convenience, immediate suspension, or cancellation after a minor breach.

Look carefully at:

• whether breaches must be material before termination is allowed
• whether a cure period applies
• whether one party can terminate while keeping deposits, data, work product, or prepaid fees
• whether the contract requires discussions before termination in ongoing relationship deals

If your business will invest heavily upfront, loose termination wording can undermine the value of the contract from day one.

Performance standards and acceptance criteria

Good faith becomes harder to assess when success is measured by vague standards. Terms like “to the client's satisfaction” or “commercially acceptable” may give one party too much room to reject work or withhold payment.

It is better to use objective benchmarks, milestones, service levels, response times, defect periods, or written specifications. Clear standards reduce the need to argue later about whether a party acted fairly.

Exclusivity and minimum commitment terms

If one side is giving exclusivity, expected volumes, preferred supplier status, or territory protection, the contract should spell out what each party must do in return. Good faith arguments often arise where one business commits heavily and the other keeps maximum flexibility.

For example, a distributor may commit to promotion, staff, and local marketing, but the supplier keeps the right to sell directly, appoint others, or limit stock. If the bargain depends on mutual commitment, record that clearly.

Negotiation and variation processes

Some agreements say parties will negotiate future pricing, renewals, service expansions, or additional work in good faith. These clauses can be useful, but they need structure. A bare obligation to negotiate may be hard to enforce if there is no process or objective framework.

Consider including:

• timeframes for meetings and responses
• the information each side must provide
• interim pricing or service arrangements while negotiations continue
• escalation steps if managers cannot resolve the issue

Entire agreement and reliance wording

Before you rely on a verbal promise, check whether the contract says it contains the full agreement and that no other representations are binding. These clauses are common, and they can limit arguments based on what was said during negotiations.

If a statement mattered to your decision to sign, ask for it to be included in the contract, schedule, statement of work, or side letter.

Industry context matters

Good faith risk shows up differently depending on the deal. In a software services contract, the issue may be suspension rights, change requests, data access, or service credits. In a supply agreement, it may be stock allocation, lead times, minimum orders, or quality rejections. In a commercial lease fitout deal, it may be consent timing, approval discretion, or landlord consent and coordination obligations.

The legal wording should match the commercial pressure points of your industry and the actual founder moment you are dealing with, especially before you accept the provider's standard terms.

Common Mistakes With Good Faith in Contract Law

The main mistake is assuming good faith will fill every gap. It usually will not.

Assuming every commercial contract has a broad good faith duty

Many business owners have heard that contracts require parties to act in good faith and treat that as a general rule. In reality, the position is more nuanced. The contract terms, the type of relationship, and the specific power being exercised all matter.

If you sign a strongly one-sided contract, a court may still enforce it unless some other legal issue applies.

Using a generic good faith clause without defining it

A short clause can look reassuring but create argument later. If the clause does not explain what conduct is required, each side may read it differently.

This is where disputes grow. One side thinks good faith means active cooperation and flexibility. The other thinks it only means not lying. A clearer clause avoids that gap.

Leaving important promises outside the contract

Businesses often sign after email exchanges, meetings, and calls where the deal sounds balanced. Then the final written contract gives one party broad control over price, timelines, approval, territory, renewal, or termination.

If the key promise is not in the signed document, enforcing your expectation becomes much harder. This is especially risky before you spend money on setup, hire staff, or turn down other opportunities.

Ignoring how discretion can be used

Founders often focus on headline commercial terms and skim over clauses that let the other side make future decisions. But broad discretion is often the real risk.

Examples include:

• price review mechanisms with no cap or methodology
• approval rights with no timeframe
• suspension clauses triggered by vague “risk” concerns
• renewal options controlled entirely by one party
• service changes allowed on short notice

Even if a good faith argument exists later, it is better to narrow these powers upfront.

Confusing misleading conduct with lack of good faith

Sometimes the real problem is not good faith in performance but misleading statements made before signing. If a supplier exaggerated capabilities, concealed major limitations, or promised rights it never intended to grant, the issue may sit under the Fair Trading Act 1986 as well as contract law.

These are related but different questions. A proper legal review can help identify which rights matter most.

Failing to document concerns during the relationship

If a contract relationship starts going off track, businesses often keep working informally and hope the issue resolves itself. Later, when they want to argue the other side acted unfairly or outside the bargain, the written record is thin.

When problems arise, record:

• what happened and when
• which clause or commercial expectation is affected
• what information or cooperation you requested
• what response you received
• what solution you proposed

Good records will not fix a weak contract, but they can matter if the dispute turns on honesty, cooperation, delay, or misuse of discretion.

Treating standard terms as non-negotiable

Large suppliers, platforms, franchisors, and service providers often present standard terms as fixed. Sometimes they are not. Even modest changes to discretion wording, notice periods, suspension triggers, dispute escalation, or data return obligations can significantly improve your position.

This is worth checking before you sign, especially where the contract supports a core part of your operations.

FAQs

Is there a general duty of good faith in all New Zealand contracts?

No. New Zealand law does not apply one broad, identical duty of good faith to every commercial contract. Duties of honesty, cooperation, or proper exercise of contractual powers may arise in some cases, but the wording of the contract remains central.

Should we include an express good faith clause?

Usually, yes, if the relationship depends on trust, cooperation, discretion, or long term collaboration. The clause should be specific about where it applies and what conduct it requires.

Can good faith override an unfair contract clause?

Not usually. If the contract clearly gives one party a right or discretion, a general appeal to good faith may not remove that right. The better approach is to negotiate the clause before you sign.

What if the other side made promises during negotiations that are not in the contract?

Do not assume those promises are enforceable as part of the final deal. Ask for them to be written into the contract. If the statements were misleading, there may also be issues under the Fair Trading Act 1986.

When should a business get a contract reviewed for good faith issues?

Get advice before you sign a contract where one party has broad discretion, where you are making upfront investment, or where the relationship depends on exclusivity, performance cooperation, future negotiation, or renewal rights.

Key Takeaways

• Good faith in contract law is relevant in New Zealand, but it is not a blanket rule that automatically fixes poor drafting or one-sided terms.
• The contract wording is still the starting point, especially for discretion, termination, renewal, pricing, approvals, and performance standards.
• If good faith matters to the deal, use clear express clauses that define honesty, cooperation, reasonableness, consultation, or limits on arbitrary decision-making.
• Do not rely on verbal promises or negotiation assumptions. Put key commercial commitments into the written agreement before you sign.
• Check whether misleading pre-contract statements raise Fair Trading Act issues as well as contract issues.
• For startups and SMEs, an early legal review is often most valuable before you accept standard terms, commit investment, or rely on a long term commercial relationship.

If you want help with contract drafting, negotiating discretion and termination clauses, reviewing supplier or service agreements, and assessing misleading pre-contract statements, you can reach us on 0800 002 184 or team@sprintlaw.co.nz for a free, no-obligations chat.