Types of Signatures in Australia: Which Should Your Business Use?

Signing contracts should feel straightforward, but the options today can be confusing. Do you need a “wet ink” signature? Is a typed name enough? Can a director sign electronically under the Corporations Act?

Getting this right matters. The type of signature you choose affects enforceability, speed, and risk. As a small business, you want a process that’s legally sound, practical for your clients and suppliers, and scalable as you grow.

In this guide, we’ll walk through the main types of signatures used in Australia, when to use each, and the extra rules that apply to companies, deeds, witnessing, initialling and counterparts. We’ll keep it simple so you can sign with confidence.

What Do We Mean By “Types Of Signatures” In Australia?

When we talk about “types of signatures”, we’re really talking about the different ways a person or company can indicate agreement to a document. In Australian law, the key question is usually whether the method reliably shows two things:

• Identity: Is it clear who signed?
• Intent: Is it clear they intended to be bound by the document?

Courts generally look at substance over form. A valid signature can be marks, words, symbols or a process, so long as it clearly links the signer to the document and shows intention to approve it.

For a helpful overview of how validity is assessed, see what makes a valid signature and the broader legal requirements for signing documents in Australia.

Common Types Of Signatures Businesses Use

Here are the most common options, with practical pros and cons for small businesses.

Wet Ink Signature (Handwritten)

This is a traditional, handwritten signature on paper. It’s familiar and still preferred for some documents (for example, certain deeds or documents that need witnessing in specific states and territories).

Pros: Universally recognised; easy to explain. Cons: Slower; harder to track; creates paper handling and storage obligations. Compare this with electronic tools in our guide to wet ink vs electronic signatures.

Electronic Signature (eSignature)

This is a broad category covering platforms like DocuSign/Adobe Sign, drawing a signature on a screen, ticking a box, clicking “I agree”, or typing your name in a signature field.

Pros: Fast; auditable (platforms record timestamps and IP addresses); easy for remote signers. Cons: You must ensure the method reliably identifies the signer and captures their intent; some documents still require specific formalities.

Digital Signature (Cryptographic)

A subset of electronic signatures that use public key infrastructure (PKI) to encrypt a unique hash, creating a stronger, tamper-evident link between the signer and the document.

Pros: High security and integrity. Cons: More technical to implement; not always necessary for everyday contracts.

Scanned/Uploaded Signature

The signer inks a paper page, scans or photographs it, then inserts the image into a PDF. This can work, but be mindful of version control and identity verification.

Pros: Simple; maintains a familiar “signature look.” Cons: Weaker audit trail; risk of mixing pages or old versions if not managed carefully.

Typed Name / Clickwrap

Typing a name at the end of an email, or accepting online terms by ticking a box (clickwrap), can constitute a signature if the context shows intention to be bound.

Pros: Extremely fast; ideal for online acceptance flows. Cons: You’ll want clear records and a robust process to prove what was agreed and by whom (e.g., account login, timestamps, stored versions of the terms).

Company Seal or Stamp

Rare these days, as companies are not required to have a common seal. If used, seals must be affixed and witnessed in line with company rules. Most businesses prefer modern electronic execution methods instead.

When Should You Use Each Type Of Signature?

There’s no one-size-fits-all answer, but here’s a practical way to decide.

• Everyday, low-risk agreements (e.g. standard customer terms): eSignature or clickwrap can be efficient and enforceable if your process clearly captures identity and consent.
• Supplier, contractor or B2B agreements: eSignature is usually appropriate, especially with a robust audit trail and clear version control.
• High-value or complex deals: Consider eSignature with strong authentication or a digital signature (PKI). Wet ink is still fine where parties prefer it.
• Documents with formalities (e.g. deeds, certain state-based property or witnessing requirements): Check the current rules in your state or territory. Some deeds can be signed electronically, but processes and rules differ, so it’s wise to confirm the correct method before signing.

If you’re unsure, start with the legal fundamentals in legal requirements for signing documents in Australia and choose the method that best proves identity and intent for your specific document.

Company Execution: How Can A Company Sign Correctly?

If you’re signing as a company, the Corporations Act 2001 (Cth) sets out a reliable way to execute documents so third parties can assume the document is properly signed. The most common is signing under Section 127 by:

• Two directors; or
• A director and a company secretary; or
• The sole director who is also the sole company secretary (for single-director companies).

This can be done with wet ink or electronically, but you must follow the formalities. For practical detail on who can sign and how, see signing documents under Section 127.

Why does this matter? When a document is properly executed under Section 127, the other party can rely on a legal assumption that it’s validly signed. This reduces friction and disputes about authority.

If you use board resolutions or alternate methods, ensure your process aligns with your Company Constitution and internal delegations of authority. Clear internal rules help your team avoid accidental misexecution (e.g. a manager signing something they’re not authorised to sign).

Witnessing, Initialling And Counterparts: Extra Rules To Know

Depending on your document and the jurisdiction, additional formalities may apply.

Witnessing A Signature

Some documents require a witness (e.g. certain deeds, statutory declarations, state-based forms). Witness eligibility varies, and some states allow remote witnessing under set rules. If witnessing is required, make sure the witness is present (physically or in an approved remote process), sees the person sign, and adds their details correctly. For a quick primer, see witness signature rules. If you’re in NSW, there are special processes for remote witnessing in NSW.

Initialling Amendments

If you make handwritten changes to a contract, all parties should initial and date the changes so it’s clear they were agreed. This is simple but important evidence of consent. For more on process and proof, see initialling documents.

Signing In Counterparts

Many contracts allow “counterparts”, meaning each party can sign a separate copy and together they form one agreement. This is common for remote deals. If you plan to use counterparts, include a clause that clearly permits it. Our explainer on signed in counterpart covers the mechanics and best practice.

Deeds

Deeds are special legal instruments that often have stricter execution requirements than simple contracts. Rules differ between jurisdictions and have evolved (including for electronic signing). Before executing a deed, check whether your document requires witnessing, the correct signing block, and how the parties’ capacity (individual vs company) affects the process. If deeds are new for your team, it’s worth reviewing what a deed actually is and when to use one.

Practical Tips To Manage Risk With Signatures

Here’s a practical checklist to keep your signature processes efficient and enforceable.

• Match the method to the document: If it’s high value or requires formalities (e.g. a deed), slow down and confirm the correct method before signing.
• Prefer platforms with audit trails: If you use eSignature, choose a tool that records timestamps, IP addresses, multi-factor authentication and version control. This helps prove identity and intent.
• Lock in the final version: Generate a non-editable PDF or platform-stamped version after all edits are agreed. Avoid “last-minute” paper edits after eSigning unless everyone initialles those changes properly.
• Clarify who can sign: Set internal delegations of authority and keep them up to date. Align them with your Company Constitution so staff know which contracts they can sign and which must go to directors.
• Include a counterparts clause: If you’re likely to sign remotely, add a counterparts clause to reduce argument about process. Also consider a clause confirming electronic execution is acceptable.
• Collect the right details: If witnessing is required, ensure the witness writes their full name, address, capacity, and the date, and meets eligibility rules in your state/territory.
• Keep clean records: Store signed copies, audit trails, and key email acceptance records securely and consistently - ideally in a central register or contract management system.
• Train your team: Short, practical training avoids costly mistakes (e.g., a manager signing a deed incorrectly). A quick internal guide that references Section 127 and your eSignature process goes a long way.
• Be careful with emails and “informal” acceptance: If you intend a deal to be binding only once a formal contract is signed, say so explicitly. Otherwise, a clear “we accept” email can sometimes create a binding agreement earlier than you think.

If you’re building or updating your sign-off workflow, it’s worth revisiting the essentials around valid signatures and your team’s rules for Section 127 execution - that way, everyone is aligned on the “how” and “who”.

Key Takeaways

• In Australia, a signature is about identity and intent - the “type” can be wet ink, electronic, digital, scanned or typed, as long as it reliably links the signer to the document and shows they agree.
• Everyday contracts can often be signed electronically; higher-value or formal documents (like deeds) may need extra steps such as witnessing or specific execution blocks.
• For companies, signing properly under Section 127 gives counterparties confidence and reduces disputes about authority.
• If you amend a document, ensure everyone initials the changes, consider a counterparts clause for remote deals, and keep a clean, finalised record of what was signed.
• A robust process (clear delegations, eSignature with audit trails, correct witnessing where required) is the easiest way to minimise signature disputes and keep deals moving.
• When in doubt, check the legal requirements for signing and confirm whether your document needs special formalities before you sign.

If you’d like a consultation on choosing the right signature process for your contracts - including deeds, witnessing and company execution - you can reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.