Do Australian SMEs And Startups Still Need A Company Common Seal?

If you’ve set up (or are about to set up) a company in Australia, you’ve probably come across the term company common seal and wondered: is this still a thing?

It’s a fair question. Many startup founders and SME owners assume a common seal is “old-school” - something only big corporates use, or something that stopped mattering once e-signatures became common.

In reality, a company common seal can still be useful in the right situations, but it’s often not legally required. What matters is understanding when a common seal helps, when it doesn’t, and how to use it properly so you don’t accidentally create signing issues (or confusion with banks, landlords, customers, and suppliers).

Below, we’ll break down what a company common seal is, whether you still need one as a modern Australian business, and the practical steps to use it correctly.

What Is A Company Common Seal?

A company common seal is an official stamp (often an embosser or ink stamp) that shows the company’s name and ACN. Historically, it was used as a formal way for a company (as a separate legal entity) to “sign” documents.

Think of it as a company’s traditional “signature”. It’s usually used on:

• deeds (in some contexts)
• property or leasing documents
• banking and finance documents
• share certificates and corporate records
• other formal agreements where the other party wants extra comfort around execution

In Australia, company law allows companies to execute documents without a seal - but the seal remains an option.

Also, it’s important not to confuse a common seal with your everyday business branding (like a logo stamp). A common seal is a specific corporate tool used for execution and corporate formality.

What Does A Common Seal Usually Look Like?

Most common seals include:

• the company name (exactly as registered)
• the company’s ACN (Australian Company Number)
• sometimes the words “Common Seal”

Some seals are embossers (they create a raised impression), others are ink stamps, and some companies use seal wafers/stickers with an impression. The format matters less than ensuring it clearly identifies the company.

Do You Still Need A Company Common Seal In Australia?

For most SMEs and startups, the answer is: no, you usually don’t “need” a company common seal.

Under Australian law, a company can generally execute agreements by signature (for example, by directors signing in certain ways), without using a seal.

That said, the company common seal can still be helpful depending on your industry, counterparties, and internal processes.

When A Common Seal Is Optional (Most Cases)

Many day-to-day business contracts can be signed without a seal. For example:

• customer contracts
• supplier agreements
• service agreements
• NDAs and commercial arrangements

What’s more important is that your agreement is properly executed and enforceable - which depends on getting the signing method right and ensuring the agreement is valid as a contract. If you’re unsure what that involves, it helps to understand what makes a contract legally binding in Australia.

When A Common Seal Can Still Be Useful

Even if it’s not mandatory, there are situations where using a company common seal can still make your life easier, including:

• “Policy-driven” counterparties: Some banks, landlords, government departments, or large corporates have internal policies asking for a seal on certain documents.
• Higher-value or higher-risk transactions: For major deals (finance, leases, asset purchases), the other party may want formalities “buttoned up”.
• Internal governance and consistency: If your company has multiple signatories or staff managing admin, a seal can create a consistent process (as long as you have good controls).
• Cross-border expectations: International counterparties sometimes expect a “company stamp” even if Australian law doesn’t require it.

It’s also worth checking your company’s governing documents. For example, your Company Constitution may set out rules about how your business approves documents, who can use the seal (if you have one), and what approvals are needed.

When You Should Be Careful About Using A Common Seal

A seal can create a false sense of security if the surrounding steps aren’t right. A stamp alone doesn’t automatically mean a document was properly executed.

You’ll want to be careful if:

• your team is stamping documents without proper authority or approvals
• you don’t have a clear register/process for who controls the seal
• you’re signing documents that have specific execution requirements (for example, some deeds or documents that require particular formalities under applicable law)

In other words: a seal is a tool - not a substitute for good governance.

Company Common Seal vs Section 127 Signing: What’s The Difference?

One of the most common points of confusion for company directors is whether they should use a seal or sign under the Corporations Act.

In Australia, companies often execute documents using a method commonly referred to as “Section 127 signing”. This involves directors (or directors and a company secretary, if applicable) signing in a way recognised by the Corporations Act.

If you’re weighing up which method is best, it helps to understand signing under section 127 of the Corporations Act, because it’s commonly used to give counterparties confidence the document has been properly executed.

Key Practical Differences For SMEs

• Speed: Signing is often faster than locating a physical seal and arranging witnessing.
• Remote work friendly: Modern signing processes are easier for distributed teams and directors who travel.
• Counterparty comfort: Some counterparties still like seeing a seal, but many are comfortable with proper director execution.
• Control: A seal needs to be physically controlled to prevent misuse, while a signature process can be tied into approvals and board resolutions.

As a general rule, most startups and SMEs prioritise a clear signing policy and consistent execution process over relying on a seal.

How To Use A Company Common Seal Properly (Step-By-Step)

If you decide a company common seal is useful for your business, the most important thing is to use it correctly and consistently. Here’s a practical process we often recommend for SMEs.

1) Decide Who Controls The Seal

Your seal should not be “floating around” the office (or stuck in someone’s desk drawer without oversight).

Pick a clear controller, such as:

• a director
• the company secretary (if you have one)
• an operations manager with formal written authority

If someone is signing or stamping documents on behalf of the company, you’ll also want to confirm they have clear authority to do so. In some cases, it’s appropriate to have an Authority to Act document in place, so everyone is on the same page about who can sign what.

2) Check What The Document Requires

Before you apply the seal, check whether the document needs:

• witnessing (and who can be a witness)
• signatures as well as the seal
• initials on each page
• specific signing blocks to be completed

This matters because different documents have different execution requirements. If you want a broader view of the rules, it can help to read about legal requirements for signing documents in Australia.

3) Apply The Seal Clearly (And In The Right Spot)

Usually, a document has a designated execution block for the common seal. Apply the seal there, making sure:

• the company name and ACN are readable
• it doesn’t obscure key text
• it aligns with the signing/witnessing area

If you use an embosser, you may need a seal sticker/wafer so the impression shows clearly (especially on electronic scans).

4) Have The Correct People Witness The Seal

In many situations, if a company uses its common seal to execute a document under the Corporations Act, the seal should be affixed in the presence of (and “attested” by the signatures of):

• 2 directors, or
• a director and a company secretary, or
• for a proprietary company with a sole director who is also the sole company secretary, that director/secretary.

The exact requirements can vary depending on the document and your company’s structure, and your constitution may also set additional rules about how the seal can be used.

Also remember: witnessing/attestation is not just a box-ticking exercise. If it isn’t done properly, you could end up with disputes later about whether the document was actually executed.

5) Keep A Record (So You Can Prove What Happened Later)

Good record-keeping is a big part of running a company safely.

When you use the seal, keep records of:

• the document name and date
• who approved it internally (director resolution, board minutes, etc.)
• who applied the seal
• who witnessed/attested it
• the final signed/stamped copy

This can be invaluable if you ever need to prove the agreement is valid, or if there’s a dispute about who had authority.

Common Mistakes SMEs Make With Company Common Seals (And How To Avoid Them)

Most problems we see aren’t caused by the seal itself - they’re caused by unclear processes around it. Here are a few common issues to watch out for.

Stamping Documents Without Proper Authority

If someone applies the seal without the right authority, you can end up with internal governance issues (and potentially external disputes).

As your business grows, authority becomes more complex - especially if you have multiple founders, investors, or directors. If you’re in that stage, it’s often worth having a Shareholders Agreement that sets out how key decisions are made and who can approve significant contracts.

Assuming A Seal Automatically Makes A Document Valid

A company common seal doesn’t magically fix a poorly drafted contract or a deal that was never properly agreed.

You still need clarity on commercial terms, and you still need the signing method to meet legal requirements (including any witnessing/attestation rules that apply to the way you’re executing the document).

Mixing Up Execution Styles Across Different Documents

One week you sign as director. The next week you seal. The next week someone signs “for and on behalf of” without clear authority.

This kind of inconsistency creates risk - particularly if you later need to show a counterparty that the person who signed had the power to bind the company.

A practical fix is to create a simple internal signing policy that covers:

• what types of contracts staff can sign
• what types directors must sign
• when you will use the seal (if at all)
• what approvals are required (email approval, resolution, board meeting, etc.)

Not Thinking About Signature Formalities (Initials, “p.p.” Signing, Etc.)

SMEs often run into questions like:

• “Do we need to initial every page?”
• “Can I sign on behalf of a director?”
• “Is an electronic signature OK?”

These details matter more than most founders expect, especially when the stakes are high (leases, finance, major supplier deals). If you’re ever signing for someone else, it’s worth understanding p.p. signatures and when they’re appropriate.

What Else Should Startups And SMEs Put In Place (Beyond A Common Seal)?

A company common seal is just one piece of a broader legal foundation. Even if you never use a seal (or you use it only occasionally), you’ll usually benefit from having your core legal documents in order.

Depending on your business model, that often includes:

• Company Constitution: sets internal rules for governance and decision-making (many companies adopt one from the start). Your Company Constitution can also interact with how you execute documents and approve major decisions.
• Shareholders Agreement: if you have co-founders or investors, a Shareholders Agreement can help prevent deadlocks and clarify what happens when someone exits.
• Customer terms or service agreement: sets expectations, payment terms, limits risk, and helps avoid disputes.
• Privacy Policy: if you collect personal information (for example via a website form, email list, online store), you may need a Privacy Policy.
• Employment contract: if you hire employees, your Employment Contract is a key risk-management tool and helps set clear expectations from day one.

The goal is to create a setup where signing and approvals are clear, contracts are consistent, and your business can move fast without taking unnecessary legal risks.

Key Takeaways

• A company common seal is an official stamp a company can use to execute documents, but most Australian SMEs and startups do not strictly need one.
• Many businesses execute agreements through director signing methods instead of using a seal, but some counterparties (like banks or landlords) may still request a seal for formality.
• If you choose to use a common seal, it’s important to control who can access it, follow any attestation requirements, and keep good records of when and how it was used.
• A seal doesn’t automatically make a document valid - the underlying contract terms and execution requirements still matter.
• Clear governance documents and signing processes (like a Company Constitution, Shareholders Agreement, and Authority to Act) help you avoid execution disputes as your business grows.

If you’d like a consultation about your company common seal, signing process, or setting up your company documents properly, you can reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.