Signing Authority In New Zealand: Legally Signing On Someone Else’s Behalf

If you run a small business, it’s only a matter of time before you need someone else to sign something for you (or you need to sign on behalf of your business, a director, or a related entity).

Maybe you’re travelling, your co-director is unavailable, or you’ve delegated day-to-day supplier contracts to your operations manager. Whatever the reason, it’s important to get signing authority right from day one.

Signing a document without proper authority can create messy disputes, delay deals, and in some cases expose you (or your business) to liability. The good news is that with the right setup and paperwork, signing on someone else’s behalf can be straightforward and legally effective.

Note: This article provides general information for New Zealand businesses and isn’t legal advice. Execution and authority requirements can vary depending on the document type (including whether it’s a deed), the contract’s execution clause, and the parties involved.

What Is Signing Authority (And Why Does It Matter)?

Signing authority is the legal ability to sign a contract or document so that it binds another person or entity (most commonly, a company).

In practical terms, it answers questions like:

• “Can my staff member sign this supplier agreement for my business?”
• “If my co-director is away, can I sign on behalf of the company alone?”
• “Can a parent company sign for a subsidiary?”
• “If I sign ‘for and on behalf of’ someone else, will it actually be enforceable?”

Getting signing authority right matters because a signature is often the final step that creates a binding deal. If the signer didn’t have authority, you can end up with:

• An unenforceable contract (or a contract the other party claims is unenforceable)
• Internal disputes between business owners/directors about who approved what
• Payment and delivery issues because suppliers won’t proceed without proper execution
• Personal liability risks if someone signs in a way that makes it look like they’re contracting personally

A helpful starting point is understanding the basics of enforceability and execution, including what makes a signed document legally binding.

Common Small Business Situations Where Signing Authority Comes Up

Signing authority isn’t just a “big corporate” issue. It shows up constantly in day-to-day operations for SMEs, especially when you’re moving quickly.

1) Staff Signing Supplier Or Customer Contracts

You might have a team member signing:

• supplier onboarding terms
• customer service agreements
• purchase orders and variations
• leases, licences, or venue hire paperwork

Even if you’ve verbally said “yes, you can sign,” you’ll usually want that authority clearly documented (and limited) so you stay in control of risk.

2) One Director Signing For The Company

Many NZ companies have two directors, but in reality one person handles the day-to-day. Whether one director can sign alone depends on:

• your company’s constitution (if you have one)
• board/shareholder decisions about delegations
• what the contract itself requires for execution

It also depends on how the document is meant to be executed under New Zealand law. For example, many agreements can be signed by a director or another properly authorised signatory, but some documents (including certain deeds or documents used in specific processes) may have additional formality requirements, or the other party may insist on a particular signing method.

If you’re unsure whether your company structure supports what you’re doing in practice, it’s often worth tightening things up with a Company Constitution and/or clear internal approvals.

3) Signing On Behalf Of Another Person (With Permission)

This could be where you’re signing for:

• a business partner
• a client (e.g. in professional services, where they authorise you to sign a form)
• a family member involved in the business

In these situations, you generally need a clear authority basis (and in some cases, a specific legal instrument such as a power of attorney).

4) Signing For Related Entities (Multiple Companies)

If you run multiple entities (for example, one company owns the IP and another does trading), you need to be careful not to accidentally sign in the wrong capacity.

This is one of the most common “simple admin” mistakes that turns into a big legal issue later-especially when the wrong entity becomes liable for debts or obligations.

How Do You Create Signing Authority In New Zealand?

There isn’t only one way to create signing authority. The “right” approach depends on who needs authority, what they’re signing, and how much risk sits in the document.

Here are the most common ways small businesses set up signing authority in NZ.

1) Authority Given Under An Employment Or Contractor Arrangement

If someone works in your business (employee or contractor), you can authorise them to sign certain documents as part of their role.

This authority is often supported by:

• their position description
• internal delegations of authority policy
• your contract terms

For example, an operations manager might have authority to sign supplier agreements up to a certain dollar value.

Tip: if you’re formalising who can sign what, it helps to align it with your Employment Contract (or contractor agreement), so expectations are clear and enforceable.

2) An “Authority To Act” Document (Practical And Common)

For many business scenarios-especially where someone needs to sign or deal with third parties on your behalf-an authority document can be a clean solution.

An Authority to act form typically sets out:

• who is granting authority (person or company)
• who is receiving authority (the authorised person)
• what they are authorised to do (and any limits)
• timeframes (one-off, ongoing, or expiry date)
• any requirements to report back or obtain pre-approval

This is especially useful where a bank, supplier, landlord, or customer wants written confirmation that the signer is legitimately authorised.

However, an authority to act document won’t always be enough on its own. If the contract’s execution clause requires a particular signing method (for example, specific company signatories), or the transaction is higher risk, you may also need a directors’ resolution, a formal delegation, or another instrument that matches the document’s requirements.

3) Company Approvals (Board Resolutions And Delegations)

If your business is a company, internal approvals matter. A company acts through its directors and authorised agents, so it’s good practice to record key decisions.

Depending on what’s being signed, you may need (or want) a formal resolution to:

• approve entering into the contract
• approve key terms (price, duration, exclusivity, liability caps)
• authorise a specific person to sign on behalf of the company

This is where a Directors Resolution can be a simple but powerful piece of your compliance “paper trail”.

As a general rule, the higher the risk or value, the more important it is to document the decision properly.

4) Power Of Attorney (Stronger Authority, But Not Always Necessary)

A power of attorney is a legal document that authorises another person to act for you. It can be broad or limited to specific tasks.

Power of attorney is more commonly used in personal contexts, but it can also come up in business-especially where someone needs to handle significant matters while you’re unavailable.

This is not something you want to DIY. The scope, drafting, witnessing, and practical acceptance by third parties can make a big difference to whether it works smoothly.

5) Authority Created By Conduct (Be Careful)

Sometimes, authority is argued based on behaviour-e.g. your business has consistently allowed a staff member to negotiate and “sign off” deals, and the other party reasonably believes they have authority.

This area can get complicated quickly. If a dispute arises, you may end up debating what was “reasonable” and what the other party knew (or should have known).

For small businesses, the best approach is usually to avoid grey areas and make signing authority explicit.

How To Sign Correctly When You’re Signing On Someone Else’s Behalf

Even if you have proper signing authority, you still need to sign in a way that clearly shows who is bound by the document.

When signing for a company or another person, the goal is to avoid it looking like you are signing in your personal capacity.

Use The Right Signature Block

A common approach is:

• For a company: “Signed for and on behalf of by , ”
• For an individual: “Signed by as authorised signatory for ”

If the document includes execution options (for example, “signed by one director” vs “two directors”), make sure you select the method that matches your company’s governance, the authority you actually have, and what the other party will accept.

Make Sure The Correct Entity Name Is Used

This sounds basic, but it’s a very common issue. Double-check:

• the legal name of the company (not just the trading name)
• the NZBN (if included)
• the registered office address (if relevant)
• that you’re not accidentally signing for a related entity

If you use a trading name, remember it doesn’t automatically create a separate legal entity. The contract still needs to identify the true legal party.

Check If Witnessing Is Required

Some documents require witnessing (or are commonly witnessed to reduce disputes later). If witnessing is required, make sure you follow the rules about eligibility and process.

For practical guidance, it helps to know who can witness a signature in New Zealand, because not every witness is acceptable in every situation.

Don’t Forget About Electronic Signing (And Electronic Witnessing)

Many agreements are signed electronically now, which is great for speed-but you still need to ensure the method is appropriate for the document type and the parties’ requirements.

In New Zealand, electronic signing is often valid where the law allows it and the method used is reliable and appropriate for the purpose. However, there are exceptions and practical limitations: some document types and processes have specific statutory or industry requirements, and some counterparties (like banks, landlords, or government agencies) may still require “wet ink” signatures or specific witnessing/verification steps.

If the document needs witnessing and you’re doing it remotely, you should also consider whether electronic witnessing is allowed for that particular document and what steps are required, because it isn’t universally accepted in every context.

As a general rule, if the contract involves significant value, long timeframes, or high risk (like leases, IP licences, shareholder arrangements, or major supply deals), it’s worth getting advice before you rely on a quick e-sign approach.

Common Risks With Signing Authority (And How To Avoid Them)

Most signing authority problems don’t come from bad intentions. They come from moving quickly, assuming someone “can just sign,” or not realising the contract requires a specific execution method.

Here are the big risks we see for small businesses, and what you can do to protect yourself.

Risk 1: The Contract Is Challenged Or Unenforceable

If a signer didn’t have authority, the other party might later argue the contract isn’t binding-often when something goes wrong (missed delivery, quality dispute, non-payment).

How to avoid it:

• document authority clearly (especially for non-directors)
• keep written approvals for significant deals
• use consistent signing processes and templates

Risk 2: The Wrong Person (Or The Wrong Entity) Becomes Liable

If the signature block is unclear, a person signing could accidentally take on personal obligations. Or you might accidentally bind the wrong company in your group.

How to avoid it:

• use clear “for and on behalf of” wording
• ensure the contracting party details match your intended entity
• avoid “handshake” or informal email approvals for high-risk arrangements

Risk 3: Internal Disputes Between Owners Or Directors

Even if a contract is valid against the outside party, you can still have internal fallout if one director or manager signs something the rest of the business didn’t approve.

How to avoid it:

• set a delegation-of-authority policy (who can sign what, up to what value)
• record major approvals in a directors’ resolution
• consider governance documents like a constitution and shareholder arrangements for clarity as you grow

Risk 4: You Breach A Third Party Process (Banks, Landlords, Government Agencies)

Some third parties have strict signing requirements (for example, needing certified identification, specific witnessing, or proof of authority).

How to avoid it:

• ask the third party what format they require upfront
• use a signed authority to act document where appropriate
• allow extra time for witnessing or verification steps

Risk 5: You Lose Time In Negotiations Or Settlement

One of the most frustrating outcomes is doing all the commercial negotiation, agreeing on terms, then having the deal stall because the signature is “not valid”.

How to avoid it: agree early on:

• who the contracting parties are
• who will sign
• whether there are any witnessing or execution formalities

If you’re already in a negotiation and you’re not sure whether your proposed signing approach is acceptable, it’s often faster (and cheaper) to get quick legal clarity than to re-paper a deal later.

Key Takeaways

• Signing authority is about whether a person has legal power to bind another person or entity (most often, your company) by signing a contract or document.
• Small businesses commonly deal with signing authority when staff sign supplier/customer contracts, when a director signs alone, or when someone needs to sign while you’re unavailable.
• Signing authority can be created in several ways, including written delegations, an authority to act document, and (in some circumstances) a power of attorney.
• Even with authority, you must sign correctly-using the right signature block, naming the correct legal entity, and meeting any witnessing or execution requirements in the document and under applicable law.
• The biggest risks include unenforceable agreements, accidental personal liability, binding the wrong entity, and internal disputes-clear paperwork and consistent signing processes help prevent these issues.
• If the contract is high value, long term, or high risk, it’s a smart move to get legal advice before signing (or authorising someone else to sign) so you’re protected from day one.

If you’d like help setting up signing authority, reviewing an execution clause, or making sure your contracts are signed correctly, you can reach us at 0800 002 184 or team@sprintlaw.co.nz for a free, no-obligations chat.