Legal Duties Of Business Partners In New Zealand

Starting a business with a partner can feel like the best of both worlds: you share the workload, pool resources, and have someone to bounce ideas off when decisions get tough.

But it also means you’re sharing risk. And in New Zealand, partnership law can make that risk bigger than many founders expect (especially if you don’t have the right agreements in place from day one).

If you’re searching for business partner duties, you’re probably trying to work out what you and your business partner legally owe each other, what happens if someone stuffs up, and how to protect the business if things go sideways.

Below, we’ll break down the core duties partners commonly owe each other in NZ partnerships, the risks that catch small businesses out, and the practical steps you can take to set strong legal foundations.

What Counts As A Partnership In New Zealand?

Before we get into business partner duties, it’s worth checking whether you’re actually in a “partnership” in the legal sense.

In NZ, you can have a partnership even if you never signed anything and even if you don’t call it a partnership. If two or more people carry on a business together with a view to profit, that can be enough to create a partnership under the Partnership Act 1908.

Common signs you may be in a partnership include:

• you both contribute money, skills, or assets into the business
• you share profits (and sometimes losses)
• you both make management decisions
• customers and suppliers deal with you as if you’re “in business together”

This matters because once you’re in a partnership, certain duties and legal consequences can apply even if you didn’t mean them to.

Partnership vs Company: Why The Distinction Matters

A big difference is liability. In a traditional partnership, partners can be personally liable for partnership debts, and partners can be liable for what another partner does in the course of the business.

By contrast, a company is a separate legal entity (though directors still have duties and sometimes personal exposure depending on what happens).

If you’re deciding whether to run your venture as a partnership or move into a company structure, it’s worth getting advice early and documenting the arrangement properly (for example through a Partnership Agreement or, if you incorporate, a Shareholders Agreement).

Business Partner Duties: The Key Legal Responsibilities Partners Owe Each Other

When people talk about business partner duties, they’re usually talking about the duties partners owe:

• to each other (as co-owners of the same business), and
• to the partnership (because partnership property and profits are meant to benefit the partnership as a whole).

Partnership duties can come from a few places:

• the Partnership Act 1908
• the partnership agreement (if you have one)
• general legal principles (including fiduciary-style obligations in many partnership situations)

Here are the most common duties that apply in practice.

1) Duty To Act In Good Faith

Partners are generally expected to deal with each other honestly and fairly. In a small business context, this often means:

• not misleading your partner about finances, customers, or risks
• not hiding problems that could affect the business (like a tax debt or a major customer dispute)
• not making major decisions behind your partner’s back if you’ve agreed to make decisions jointly

Good faith isn’t just about being “nice” - it’s about acting in a way that respects the relationship of trust that exists when you co-own a business.

2) Duty To Disclose Relevant Information

Because partners are running a business together, there’s typically an obligation to share relevant information, especially information that affects:

• the partnership’s money
• the partnership’s obligations (like contracts or debts)
• the partnership’s customers, suppliers, or reputation

In real life, this is where disputes often start: one partner thinks they’re “handling it”, the other partner finds out later, and trust breaks down.

A well-drafted partnership agreement can set expectations on reporting, banking access, accounting systems, spending approvals, and who can sign what.

3) Duty To Account For Benefits (And Not Secretly Profit From The Partnership)

If a partner makes a private gain from a partnership opportunity, or receives a benefit because they’re a partner (without telling the other partner), that can create serious legal issues.

Examples can include:

• taking a customer lead meant for the partnership and diverting it into a separate business
• accepting “kickbacks” or commissions from a supplier without disclosure
• using partnership property (like equipment, IP, or systems) to make side income

Even if the amounts seem small at first, these situations can escalate quickly once there’s conflict.

4) Duty Not To Undermine The Partnership (Including Through Competing Activities)

Whether and when a partner can run a side business (or do work that overlaps with the partnership) depends on the circumstances and what you’ve agreed. There isn’t a one-size-fits-all “non-compete duty” that automatically bans all competing activity in every partnership.

That said, because partners owe each other obligations of loyalty and good faith, competing in a way that diverts partnership opportunities, uses partnership resources, or harms the partnership’s goodwill can create real risk.

If your business depends on relationships (clients, suppliers, referral sources), it’s especially important to clearly document:

• what counts as “competition” for your business
• whether partners can have side projects (and on what terms)
• who owns customer lists and leads
• what happens if a partner exits and starts a similar business

This often overlaps with restraint-of-trade issues, confidentiality, and ownership of intellectual property - and the enforceability of restraints can depend on whether they’re reasonable in scope, duration, and geography.

5) Duty To Use Partnership Property For Partnership Purposes

Partnership property (like money, stock, equipment, branding, or software accounts) is meant to be used for the partnership’s benefit.

This is why it’s important to clearly define what the partnership owns and what each partner personally owns - especially if you’ve contributed assets at different times, or one partner is “lending” equipment to the business.

If your partnership collects customer data (names, emails, booking history), you also need to treat that information carefully and comply with the Privacy Act 2020. In practice, this is often supported by having a proper Privacy Policy and making sure only authorised people can access or export customer lists.

Liability Risks: What You Can Be Responsible For If Your Business Partner Messes Up

This is the part many small business owners don’t hear early enough: in a general partnership, each partner can be liable for what the other partner does in the usual course of the business.

That can include:

• debts to suppliers
• lease obligations
• customer refund claims
• employee entitlements
• damages for breach of contract

So if your partner signs a contract the business can’t afford, or racks up debt, you may be exposed too - even if you didn’t personally approve the decision.

“Joint And Several Liability” In Plain English

In many partnership scenarios, a creditor can pursue one partner for the full amount (not just “their half”). You might then have to chase your partner for contribution afterwards - which isn’t much comfort if the relationship has broken down or your partner can’t pay.

This is why clear rules around authority and spending limits are so important. It’s also why some partnerships choose to incorporate (so the company contracts and holds liabilities), though that comes with different governance responsibilities.

Employment And Contractor Risks Can Flow Through The Partnership

If your partnership hires staff, you also need to be mindful that employment obligations sit with the employer (which may be the partnership). That includes paying wages correctly, meeting leave entitlements, and following a fair process if termination becomes necessary.

Having the right documents in place helps avoid misunderstandings, including a tailored Employment Contract for employees and a proper Contractor Agreement when engaging independent contractors.

How Do You Split Decision-Making Between Partners?

One of the most practical business partner duties issues is decision-making: who can make which calls, and what approvals are required.

Without an agreement, you can end up relying on default rules and assumptions - which is where partnerships get stuck. For example:

• one partner wants to reinvest profits, the other wants drawings
• one partner wants to expand and sign a new lease, the other thinks it’s too risky
• one partner hires staff without consulting the other

A partnership agreement can set out governance rules in a way that fits your business (not a generic template). Common decision-making clauses include:

• roles and responsibilities (e.g. one partner runs operations, the other runs sales/finance)
• voting (majority vs unanimous decisions)
• reserved matters (decisions that must be unanimous, like borrowing money or admitting a new partner)
• financial controls (spend limits, banking access, approval process)
• drawings (how partners take money out, and when)

Be Clear On Authority To Bind The Business

In day-to-day operations, someone usually needs to sign things: supplier agreements, customer contracts, lease documents, software subscriptions.

If you don’t clarify signing authority, you can accidentally create a situation where:

• either partner can bind the partnership to big obligations, and
• the other partner has no real-time visibility until it’s too late.

If your business regularly enters into ongoing arrangements with customers (especially in service businesses), having clear Service Agreement terms can also help reduce disputes about scope, payment, and liability.

What Happens When A Partner Wants To Leave (Or You Want Them To Leave)?

Even strong partnerships can change over time. A partner might want to relocate, change careers, or simply disagree on the direction of the business.

The tricky part is that “leaving” isn’t just personal - it affects customers, cashflow, ownership of assets, and ongoing liabilities.

Common questions we see include:

• Can a partner resign whenever they want?
• Do they have to give notice?
• How do we value the business?
• Who keeps the customer relationships?
• What happens to debt that exists at the time they leave?

Exit Provisions You’ll Want In Writing

This is where a partnership agreement earns its keep. Useful clauses typically cover:

• notice requirements (how much notice a partner must give)
• buy-out process (can the remaining partner buy the departing partner out?)
• valuation method (agreed formula, independent valuation, or accountant valuation)
• payment terms (lump sum vs instalments)
• treatment of loans (whether partner loans are repaid before equity is paid out)
• restraints/confidentiality (protecting goodwill and customer lists)

If your relationship has already broken down and you need to formally document the separation, a tailored Partnership Dissolution Agreement can help you capture who gets what, who is responsible for what, and how you’ll deal with unresolved issues.

Disputes: Why “We’ll Sort It Out Later” Is A Risky Plan

It’s normal to start a business feeling optimistic. But if your legal foundations rely on goodwill alone, you’re relying on something that often disappears when:

• money gets tight
• a big customer complains
• a partner’s personal circumstances change
• someone feels like they’re doing more work than the other

Sorting out exit rules early (when everyone’s aligned) is usually faster, cheaper, and far less stressful than trying to negotiate under pressure later.

Key Documents That Help Clarify Business Partner Duties (And Protect Your Business)

If you want to reduce uncertainty around business partner duties, the most practical step is putting the key rules into writing.

Here are the documents that commonly matter for partnerships and partner-like arrangements.

Partnership Agreement

This is the big one. A tailored partnership agreement can cover:

• each partner’s capital contributions
• profit and loss sharing
• decision-making and authority
• banking controls and reporting
• what happens if someone wants to leave
• what happens if there’s a dispute

It also helps you clearly define expectations so “duties” don’t become vague arguments later.

Confidentiality And IP Arrangements

Partnership disputes often involve intellectual property without anyone realising it - things like logos, brand names, websites, social media accounts, client databases, templates, or product designs.

It’s worth documenting:

• what IP existed before the partnership
• what IP is created during the partnership
• who owns it and who can use it after a split

Depending on your setup, this can be handled in the partnership agreement itself, or via separate IP or confidentiality clauses.

Customer-Facing Terms (So One Partner Doesn’t Accidentally Create Extra Liability)

If your partnership sells products or services to customers, the legal risk doesn’t just sit between partners - it also comes from external claims.

Good customer terms can reduce disputes, clarify payment obligations, and limit uncertainty around cancellations, delays, and scope changes. For many small businesses, that starts with solid Business Terms or tailored service/sale terms (depending on what you offer).

Privacy Compliance (If You Collect Customer Or Client Data)

Many partnerships collect personal information without thinking twice: emails, phone numbers, addresses, booking details, health information (if you’re in wellness), and payment records.

Partners should be aligned on:

• who has access to customer data
• where it is stored (and who can export it)
• how it is used for marketing
• what happens to the data if a partner exits

A clear Privacy Policy helps set the external rules for customers, but you should also align internally so one partner doesn’t misuse data and expose the business to complaints.

Key Takeaways

• Business partner duties in NZ partnerships often include acting in good faith, disclosing relevant information, accounting for benefits, and using partnership opportunities and property for the partnership’s benefit (rather than making undisclosed private gains).
• You can be in a partnership even without a written agreement, and legal duties can still apply under the Partnership Act 1908.
• Partners can face significant personal liability for partnership debts and for what the other partner does in the ordinary course of business, so financial controls and authority limits matter.
• A tailored partnership agreement is one of the best ways to clarify expectations around decision-making, profit sharing, roles, disputes, and exits.
• Plan for the “what ifs” early, including what happens if a partner wants to leave, becomes unable to work, or you need to end the partnership.
• Strong legal foundations (partner agreements, customer terms, employment/contractor documents, and privacy compliance) help protect the business from day one and make it easier to grow with confidence.

Disclaimer: This article is general information only and doesn’t take into account your specific circumstances. It isn’t legal advice. Partnership and tax outcomes can vary significantly depending on how your business is structured and operated, so it’s a good idea to get legal advice (and accountant or IRD guidance on tax) before you act.

If you’d like help putting the right documents in place or getting clarity on your business partner duties, you can reach us at 0800 002 184 or team@sprintlaw.co.nz for a free, no-obligations chat.