Authorised Signatory: Who Can Sign Contracts And How To Appoint One

If you run a small business, you’ll sign a lot of things - customer agreements, supplier terms, leases, contractor statements of work, loan documents, NDAs, and more. Most of the time, signing feels like an administrative step.

But legally, it’s a big moment. A signature can lock your business into obligations you can’t easily undo, including payment terms, warranties, indemnities, auto-renewals and personal guarantees.

That’s why it helps to understand how an authorised signatory works in Australia (and the practical reality of “who is allowed to sign what”). When you set clear signing authority, you reduce the risk of accidental commitments, internal disputes, and costly contract fights.

Below, we’ll step through what an authorised signatory is, who can sign contracts for your business in Australia, how to appoint someone properly, and the key risks (and safeguards) to put in place.

What Is An Authorised Signatory (And Why It Matters)?

An authorised signatory is a person who has authority to sign documents (including contracts) on behalf of a business.

In practice, being an authorised signatory usually means one (or more) of the following:

• They can create legal obligations for the business (for example, agreeing to pay invoices, accept delivery terms, or commit to a minimum spend).
• They can accept legal risk for the business (for example, indemnities, limitation of liability clauses, IP warranties, or confidentiality terms).
• Third parties can rely on their signature as evidence the business agreed to the deal.

This matters because a contract isn’t “just paperwork” - it’s one of the main ways your business takes on risk. If the wrong person signs, you can end up with:

• unexpected costs (like minimum terms, cancellation fees, or auto-renewals)
• commitments your team can’t operationally deliver
• internal conflict (for example, a co-founder saying “I never approved that”)
• disputes with customers or suppliers about whether the contract is binding

Getting signing authority right is part governance, part risk management, and part good business hygiene.

Who Can Sign Contracts For A Business In Australia?

There isn’t one universal rule, because it depends on your business structure, the type of document, and what authority you’ve actually given someone. But there are some common starting points.

Sole Traders

If you’re a sole trader, you are the business (legally speaking). That means you can sign contracts personally, and they bind the business.

You can still have staff or contractors “manage” parts of the relationship, but if you want someone else to sign for you, you should put clear authority in place. Often this is done through a written Authority to Act or similar delegation document, especially where banks, suppliers, or major customers are involved.

Partnerships

In a partnership, a partner can often bind the partnership when they’re acting within the scope of their authority and in the ordinary course of the partnership’s business. But there are limits - especially for decisions outside the usual business activities, or where the other party knows (or should know) the partner doesn’t have authority.

This is one reason partnerships can feel risky if roles aren’t clearly defined. A strong partnership agreement should set expectations around who can sign what, spending limits, and approval processes. If you’re setting up or formalising this, a tailored Partnership Agreement is typically the backbone document.

Companies (Pty Ltd)

For companies, signing authority usually comes back to directors, company governance documents, and how the company executes documents.

In Australia, many counterparties (especially for bigger deals) want the company to sign in a way that gives them confidence the agreement is properly authorised. One common method is execution under section 127 of the Corporations Act (often shortened to “signing under s127”).

In general terms, a company can sign via its directors (and sometimes a company secretary). Your internal governance documents also matter - for example your Company Constitution may set rules around decision-making and authority.

Employees, Managers And Contractors

Many small businesses rely on managers or team members to negotiate and “close” deals day-to-day. The key question is whether that person has authority to sign on behalf of the business.

Authority can be:

• Actual authority: you (or the company) explicitly gave them permission to sign (for example, in an employment contract, a delegation instrument, or a board resolution).
• Implied authority: their role reasonably suggests they can sign (for example, a procurement manager signing purchase orders within a set limit).
• Apparent authority: you’ve “held them out” as having authority (for example, you let them sign similar contracts before, you copied the counterparty into emails saying they can finalise, or they use a title like “Operations Director”).

This is where many disputes come from. A small business owner may believe “only I can sign contracts”, but if they’ve allowed someone to act like they can sign, a counterparty may argue the business is still bound.

How To Appoint An Authorised Signatory (Step-By-Step)

If you want to appoint an authorised signatory in Australia, the best approach is to make it clear, documented, and aligned with how your business actually operates.

1. Decide What They Can Sign (And What They Can’t)

Start with the scope. “You’re an authorised signatory” is too vague on its own. Instead, define:

• Types of contracts: sales contracts, supplier agreements, NDAs, leases, employment documents, marketing subscriptions, etc.
• Financial limits: for example, up to $5,000 per contract, or up to $2,000 per month in recurring services.
• Risk limits: for example, “cannot agree to indemnities” or “cannot sign anything with personal guarantees”.
• Approval steps: for example, must get written approval from a director before signing, or must use a lawyer-reviewed template only.

Small businesses often do this as a “delegation of authority matrix”, even if it’s only a one-page table.

2. Put The Appointment In Writing

To avoid confusion later, document the appointment. Depending on your structure and needs, this may be done through:

• a signed internal authority letter
• a formal Authority to Act document
• board resolutions (for companies)
• contract signing policies (often part of a staff handbook or governance pack)

Writing it down helps you control scope and prove what authority was actually given if a dispute arises.

3. Align It With Your Company’s Governance (If You’re A Company)

If you operate through a company, it’s worth checking that your governance documents support what you’re trying to do. For example:

• Does your constitution allow delegation of powers?
• Are there director approval requirements for certain decisions?
• Do you need a directors’ resolution for signing authority, bank authority, or major spending?

In many cases, these issues are cleaned up as part of getting your company’s documents right from the start, including a suitable Company Constitution.

4. Train Your Team On “Signing” (Including E-Signatures And Email Acceptance)

When people think “signing contracts”, they picture wet ink or a digital signing platform. But businesses can end up bound in other ways too (for example, agreeing to terms by email, clicking “I accept”, or issuing purchase orders). Whether these methods are legally effective can depend on the document type and any formality requirements (for example, some deeds and certain transactions can have additional signing requirements).

Practical training should cover:

• what the authorised signatory is allowed to approve
• what clauses must be escalated (indemnities, limitation of liability, auto-renewals, exclusivity, IP ownership, restraints)
• who reviews contracts before signature
• where the “final signed version” is stored

This is especially important if you have staff doing procurement, sales, or operations.

5. Tell Third Parties When Needed (But Don’t Overshare)

Sometimes, counterparties will ask for evidence that someone is authorised to sign. This is common for:

• banks and lenders
• leases
• large supply agreements
• government or enterprise customers

In those cases, you may provide a short authority letter or relevant resolution excerpt. You generally don’t need to provide your internal policy or detailed delegation matrix - just enough to confirm authority.

Common Scenarios Where Authorised Signatory Issues Come Up

If you’re wondering whether this really affects small businesses day-to-day, it does. Here are common situations where we see signing authority create legal and commercial problems.

A Staff Member Signs A Supplier Contract With “Hidden” Terms

This could be as simple as a marketing subscription, software contract, or equipment lease with:

• minimum terms (e.g. 24 or 36 months)
• auto-renewal unless cancelled within a narrow window
• large early termination fees
• broad indemnities or liability clauses

If the supplier can argue the staff member had actual or apparent authority, you may be stuck with the deal.

A Co-Founder Signs Without The Other Co-Founder’s Consent

In founder-led businesses, disputes often happen when one founder signs a “big” contract (like a lease or major customer deal) and the other founder says it was never approved.

This is partly a relationship issue, but it’s also a documentation issue. Strong internal governance (and often a well-drafted shareholders agreement) sets decision-making rules and signing thresholds. If you have multiple owners, a Shareholders Agreement can help prevent disputes by setting out who decides what and when special approvals are needed.

Someone Signs In The Wrong Capacity (And Accidentally Takes Personal Liability)

Small business owners are often asked to sign “as director” and also “as guarantor” (a personal guarantee). Sometimes this is obvious, and sometimes it’s buried in the signing block or annexures.

This is one of the most serious risks: you can end up personally on the hook if the company can’t pay.

As a general rule, you should slow down any time you see words like “guarantee”, “indemnity”, “security”, “charge”, or “director’s guarantee”.

Contracts Accepted By Email (Even Without A Formal Signature Page)

A contract can often be formed when there is offer and acceptance, even if nobody prints and signs a formal document. However, this depends on the context and the document type (and some documents have additional formality requirements).

If a manager emails “Sounds good, please proceed” after receiving terms, that message can be used as evidence of acceptance. This is why contract workflows matter, not just signatures.

Key Risks For Small Businesses (And How To Reduce Them)

Setting up an authorised signatory process is about more than “who holds the pen”. It’s about controlling risk in a way that still lets your business move quickly.

Risk 1: Being Bound By Deals You Didn’t Intend To Approve

Why it happens: unclear internal authority, staff trying to be helpful, or a fast-moving sales/procurement process.

How to reduce it:

• create signing limits and approval thresholds
• use standard templates for routine deals
• keep a central contract register (even a spreadsheet is better than nothing)
• make “only these people can sign” a written policy

Risk 2: Personal Liability Through Guarantees Or Indemnities

Why it happens: business owners sign quickly, or documents are presented as “standard”.

How to reduce it:

• require legal review before signing leases, finance documents, or high-value supplier agreements
• train your team to flag any guarantee wording immediately
• make it a rule: nobody signs anything that includes a personal guarantee without director approval

Risk 3: Internal Disputes And Governance Breakdowns

Why it happens: founders or directors have different views on decision-making, and the business lacks a clear framework.

How to reduce it:

• document key approvals (even via written resolutions or signed minutes)
• set “reserved matters” (decisions that require all founders/directors to approve)
• use a clear governance document like a shareholders agreement for multi-owner companies

Risk 4: Operational Bottlenecks (Everything Needs The Owner’s Signature)

Why it happens: owners fear risk (understandably), so they centralise signing - but it slows down growth.

How to reduce it:

• delegate low-risk and low-value contracts with clear limits
• use pre-approved templates to reduce clause-by-clause negotiation
• set a fast escalation pathway for anything “non-standard”

The goal isn’t to eliminate risk completely (that’s not realistic). It’s to make risk intentional and controlled.

Risk 5: Missing Contract Basics (Because You’re Focused Only On Who Signs)

Even with the right authorised signatory, a contract can still be risky if it doesn’t reflect what you actually do or can deliver.

For small businesses, it’s often worth standardising the core legal documents that sit behind your day-to-day work, such as:

• Customer terms: pricing, scope, timeframes, change requests, payment terms, liability limits
• Privacy compliance: especially if you collect customer data online, a Privacy Policy is often essential
• Website rules: if you sell or market online, Website Terms and Conditions can set the ground rules for users
• Staff documents: clarity around roles and authority often starts with the Employment Contract and policies

These documents help your authorised signatory sign faster and more confidently, because the legal framework is already agreed internally.

Key Takeaways

• An authorised signatory in Australia is someone who has authority to sign contracts and create legal obligations for your business.
• Who can sign depends on your business structure (sole trader, partnership, company) and the authority you’ve actually given (including implied or apparent authority).
• To appoint an authorised signatory, define the scope (what they can sign), set financial and risk limits, and document the authority in writing.
• Common signing issues include staff signing “standard” supplier contracts with risky terms, founders signing without internal approval, and accidental personal guarantees.
• Strong governance and well-drafted templates (customer terms, privacy, website terms, employment documents) make contract signing safer and more efficient.
• If your business is growing, a clear signing policy helps you move quickly without losing control of legal and financial risk.

This article provides general information only and does not constitute legal advice. If you’d like help setting up an authorised signatory process or reviewing the contracts your business signs, reach out to Sprintlaw on 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.