Signing Contracts Under Power Of Attorney In Australia

In business, you can’t always be the person who signs every document.

Maybe you’re travelling, dealing with illness, expanding into new locations, or you simply want your operations team to be able to move faster without waiting for your signature every time. In those situations, a Power of Attorney (POA) can be a practical tool - but it’s also one that needs to be used carefully.

It’s common for business owners to ask us about signing under power of attorney, especially when banks, landlords, suppliers or customers are pushing for quick turnaround. The key is understanding what a POA can (and can’t) do, and what “good signing” looks like so your contracts don’t get challenged later.

This guide walks you through the practical legal and operational issues Australian businesses should think about when signing under a POA, including execution formats, common traps, and what to set up internally so your business can sign documents confidently.

What Does “Signing Under Power Of Attorney” Mean In A Business Context?

Signing under power of attorney usually means one person (the “attorney”) signs a contract or document on behalf of another person or entity (the “principal”), relying on authority granted in a Power of Attorney.

For small businesses, POAs most commonly come up where:

• You run your business as a sole trader and want someone to be able to sign contracts while you’re unavailable.
• You’re a director or shareholder and want someone to sign certain documents for you personally (for example, in a sale process or financing arrangement).
• A lender, counterparty, or government process requires signing to happen even if key decision-makers are unavailable.

One important point: POAs aren’t only for individuals. Individuals commonly use POAs, but companies can also grant a POA (or otherwise appoint an agent) to authorise someone to sign on the company’s behalf. That said, companies also often rely on other mechanisms such as board resolutions, delegated authorities, or signing under section 127 of the Corporations Act - and which option is best can depend on the document, the counterparty’s requirements, and how the authority is structured.

When you’re trying to work out the cleanest path, it helps to first identify:

• Who is the principal? (An individual business owner? A director personally? A company?)
• What document is being signed? (A simple contract? A deed? A bank facility? A lease?)
• What execution method is required? (Wet ink? e-signature? witnessing? specific wording?)

Power Of Attorney Vs “Authority To Act” (Why The Difference Matters)

A POA is a formal legal instrument that appoints an attorney with defined powers. It’s often used where third parties want strong evidence of authority.

By contrast, some business tasks can be handled using a more limited authorisation (for example, an Authority to Act Form), depending on what the other party will accept and the type of transaction.

If you’re not sure which approach fits your situation, it’s usually worth clarifying it upfront - because the “right” solution often depends on what the counterparty (like a bank or landlord) requires.

When Should Your Business Use A Power Of Attorney (And When Shouldn’t You)?

POAs can be extremely useful, but they’re not something you want floating around your business without guardrails.

In our experience, using a POA for signing makes the most sense when you need a reliable way for someone else to sign, and you want third parties to feel confident the signature will hold up.

Common Business Scenarios Where A POA Helps

• You’re overseas or frequently unavailable and contracts need to be signed quickly (for example, supplier agreements or large client deals).
• A property or lease transaction is time-sensitive and the landlord requires physical execution by a specified deadline.
• Business sale or acquisition processes where multiple documents are being executed over a period of time and you want a deal lead to execute within limits.
• Finance transactions (loans, security documentation, guarantees) where counterparties have strict signing requirements.
• Unexpected incapacity (for example, illness) and business operations still need to function.

When A POA Can Be Risky Or Overkill

A POA may not be the best first option where:

• You only need someone to sign one specific document once (a more limited authorisation may work).
• You can sign under company processes instead (for example, director signatures under the Corporations Act, or internal delegations).
• You can’t clearly limit the scope of what the attorney can do (broad POAs can create real governance risks).

If you do use a POA, it’s important to align it with your internal controls. Otherwise, you might “solve” the signing problem but create a bigger risk: someone having more power than you intended, or the business being locked into obligations you didn’t approve.

How To Sign Under Power Of Attorney (So The Contract Is Enforceable)

The big practical question we hear is: “How should the attorney actually sign?”

There isn’t one universal signing block that works for every contract, but the goal is consistent: make it clear the attorney is signing for the principal, under the POA.

As a general rule, the attorney should avoid signing only their own name with no context. If the signature doesn’t show representative capacity, the other party may later argue the attorney signed personally (or that the document wasn’t properly executed at all).

Typical Signing Format (Example)

You’ll often see a structure along the lines of:

• [Principal’s name] by their attorney [Attorney’s name] under Power of Attorney dated [date]

Or, in short form:

• [Attorney’s signature]
• [Attorney’s name] as attorney for [Principal’s name]

The exact wording can depend on the document, the state/territory requirements, and whether the document is a deed (which can have stricter execution requirements).

Do You Need To Attach A Copy Of The POA?

Often, yes - at least in practice.

Even if not legally mandatory in every situation, providing a copy of the POA (or a certified copy) is a common expectation, particularly for banks, landlords, and larger counterparties.

In some processes, the other party will want to review:

• the date of the POA
• the scope of powers granted
• any limits or conditions
• whether it is still valid (and, in some cases, whether it has been revoked)

What About Electronic Signatures?

E-signing can be possible, but don’t assume it will always be accepted. Whether an electronic signature works can depend on the type of document, the relevant state or territory rules, the contract’s execution clause, and the counterparty’s own policies. Some counterparties still require wet ink signatures for certain documents, and some documents (including certain deeds) can attract additional formality requirements.

If you’re trying to keep things clean, it’s worth checking the execution clause and any “counterparts” provisions in the document, and confirming what the other party will accept before you sign.

More broadly, execution formalities matter - and getting them wrong can create major headaches later. If you want a plain-English overview of what counts as execution in Australia, legal requirements for signing documents is a helpful baseline reference.

Key Risks When Signing Under Power Of Attorney (And How To Reduce Them)

Using a POA is not just an admin shortcut - it changes your risk profile.

Here are the issues we commonly see when businesses rely on a POA for contract signing, and what you can do to reduce the risk.

1. The Attorney Signs Outside Their Authority

A POA can be limited. For example, it might only allow the attorney to deal with “banking matters” or only allow contracts up to a certain value.

If the attorney signs beyond the authority granted, you can end up with disputes about whether the principal is bound. Even where the principal is ultimately bound (depending on the circumstances), you may have internal governance issues to deal with.

Practical tip: keep a written internal delegation policy and make sure the attorney has clear written instructions for each transaction (even if the POA itself is broad).

2. The Other Party Refuses To Accept The Signature

Even if the signing is legally valid, counterparties sometimes refuse it because:

• they don’t understand the POA
• their internal policy requires “director signature” or “owner signature”
• they want a specific signing format
• they want evidence the POA hasn’t been revoked

Practical tip: send the POA (or certified copy) and proposed execution block before signing day. It’s much easier to fix objections early than to renegotiate a completed signing pack.

3. Personal Liability Confusion

If the attorney signs in a way that looks like they’re signing personally, it can blur who is actually on the hook for the obligations.

This is why a clear execution block matters, and why it’s worth checking what the contract says about parties and execution.

If you’re reviewing signing formats generally (including “on behalf of” signing), P.P. signatures can also come up in internal business processes - but you’ll still want to be careful not to treat “PP” as interchangeable with a POA.

4. Governance Gaps (Especially In Companies)

If your business operates through a company, you should think about whether a POA is the correct mechanism at all, or whether you should use company execution and delegations.

For example, many companies sign key documents using the Corporations Act execution mechanism. If you’re comparing options, signing under section 127 is a common pathway for companies and can be more straightforward than relying on a POA (depending on the document and the counterparty).

5. Deeds, Witnessing And “Extra” Formalities

Some transactions require deeds (not just agreements). Deeds can have stricter signing rules, and the requirements can differ depending on who is signing (individual vs company), how the deed is executed (including whether it’s electronic), and which state/territory law applies.

Practical tip: treat deeds as a separate category. If the document says “Deed”, don’t assume you can sign it the same way as a standard contract.

What Internal Setups Should You Put In Place Before Anyone Signs Under A POA?

If you want to use POAs effectively, you’ll get the best results when the legal document is backed by practical business processes.

Here are the internal setups that help small businesses use a POA safely.

Keep A “Signing Authority Register”

Even in a small business, it helps to keep a simple register (a spreadsheet is fine) showing:

• who has authority to sign
• what documents they can sign (and any limits)
• where the signed POA is stored
• expiry/review dates (if applicable)
• any revocation dates

This reduces the risk of outdated authorities being used, especially as staff change roles.

Use Checklists For High-Risk Transactions

Some documents carry higher risk than others - for example, leases, guarantees, loan documents, or long-term supply arrangements.

For those, consider an internal checklist that covers:

• who approved the transaction commercially
• whether legal review is needed
• the signing method required (wet ink / e-sign)
• whether the counterparty needs a copy of the POA
• post-signing steps (storage, notifying finance team, contract management)

Be Clear On “Authority” Documents Your Business Uses

Some businesses use a POA, others use an internal authority instrument, and others rely on specific letters for one-off transactions.

If you need something limited and transaction-specific, a letter of authority to act can sometimes be a better fit than a broad POA, depending on the counterparty and what the document needs to achieve.

Don’t Forget “Valid Signature” Issues

It’s easy to focus on who is signing and forget how a signature is created and recorded.

For example:

• Does the contract permit electronic signatures?
• Is the person’s name typed, or is it a stylus signature?
• Is there a witness requirement?
• Does the counterparty require initials on every page?

These details can matter, especially if there’s ever a dispute. If you’re tightening up internal processes, what makes a valid signature is a useful reference point for building a consistent signing approach across your business.

Key Takeaways

• Signing under power of attorney lets an attorney sign contracts on behalf of a principal, but you need to be clear about who the principal is (individual vs company) and what authority exists.
• A POA can be a practical solution for time-sensitive business transactions, especially where third parties want strong proof of signing authority.
• The signing block should clearly show the attorney is signing for the principal under the POA, otherwise you risk disputes about enforceability or personal liability.
• Be alert to higher-risk documents like deeds, leases and finance documents, which may have stricter execution requirements than standard agreements and can vary by jurisdiction and document type.
• Strong internal processes (authority registers, checklists, and clear approvals) help you use POAs safely and avoid accidental overreach.
• If your business is a company, consider whether company execution methods (like section 127 signing) or a company-granted POA/agency arrangement may be a cleaner option, depending on the situation.

If you’d like help setting up a signing process or reviewing a document you plan to execute (including signing under a POA), you can reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.

Official Sources to Check

Rules and regulator guidance can change. Check the current official material most relevant to this issue before relying on the article:

• ACCC: Contracts and unfair contract terms