When is a wet signature required?

A wet signature is required only when a particular law, a registry, the receiving organisation or the document itself demands paper, ink or a witness in a form an electronic signing cannot satisfy. For ordinary contracts in Australia, the United Kingdom and the United States, an electronic signature is generally enough. The documents where paper still matters are a short and fairly consistent list: wills, deeds and other documents that need a witness physically present, some statutory declarations, court documents, anything that must be registered, and a set of consumer notices the US law carves out.

This is general information, not legal advice. The rules below were checked against the sources listed on 13 September 2026, and they change, so read the current rule for your document before relying on it.

The general rule

All three countries start from the same position: a signature or contract cannot be refused legal effect just because it is electronic. Section 7001(a) of the US ESIGN Act says exactly that for transactions in or affecting interstate commerce. Australia’s Attorney-General’s Department says the Electronic Transactions Act covers most electronic processes under Commonwealth law, with some exemptions. The Law Commission of England and Wales concluded that an electronic signature is capable in law of executing a document, including a deed, provided the signer intends to authenticate it and any formalities are met.

That last phrase is the whole answer. A wet signature is needed where a formality cannot be met electronically: a witness who must be in the room, a handwritten form a statute specifies, an original a registry must hold. The country by country detail is where those formalities live. The evidence side of the question, meaning what makes an electronic signature hold up once it is allowed, is covered in are electronic signatures legally binding.

Exceptions in Australia

Australia’s answer is split between the Commonwealth and the states, and the split is the first thing to get right.

The Commonwealth Electronic Transactions Act 1999 applies only to Commonwealth laws. Every state and territory has its own Electronic Transactions Act for processes under its own laws, and those can carry different exemptions. Leases, most land dealings, wills and powers of attorney are generally governed by state law, so the Commonwealth Act is not the place to look.

Within Commonwealth law, the Attorney-General’s Department describes three kinds of exemption: laws listed in the Electronic Transactions Regulations 2020, such as sections exempted from the Corporations Act 2001; laws listed in the Act’s own schedule; and other laws that override a specific provision. An exemption does not automatically mean paper. It means the Act cannot be relied on, and the specific law then decides.

Statutory declarations show how fast this moves. A Commonwealth statutory declaration can now be made three ways, each equally valid: on the approved form with a witness in person, on the form with a witness watching over a video link, or as a digital declaration through myGov with a Digital Identity and no witness at all. A state declaration follows that state’s rules.

Finally, the parties can choose paper. The Department notes that a contract clause requiring paper may override the Act. If your agreement says notices must be in writing on paper, an emailed notice may not count.

Exceptions in the UK

For England and Wales, two rules do most of the work.

Wills. Section 9 of the Wills Act 1837 says a will is not valid unless it is in writing, signed by the testator, and the signature is made or acknowledged in the presence of two or more witnesses present at the same time, each of whom signs or acknowledges in the testator’s presence. A temporary amendment counted presence by video for wills made from 31 January 2020 to 31 January 2024. Outside that window the witnesses need to be physically there, which in practice means paper. The Law Commission’s electronic execution project expressly left wills out of scope.

Deeds. The Law Commission’s statement of the law is that an electronic signature can execute a deed, but a deed must be signed in the physical presence of a witness who attests the signature, even where both use electronic signatures. So a deed can be signed on a screen, but not with a witness in another building.

The project also excluded registered dispositions under the Land Registration Act 2002, so anything going to the land register needs its own check.

Exceptions in the US

The US list is the most explicit, because ESIGN writes it out. Under section 7003, ESIGN does not apply to records governed by the law on wills, codicils and testamentary trusts; state law on adoption, divorce and other family matters; or most of the Uniform Commercial Code. It also does not apply to court orders, notices and official court documents; notices of utility cut off; notices of default, acceleration, repossession, foreclosure or eviction under a credit agreement secured by, or a rental agreement for, a primary residence; notices cancelling health or life insurance; product recall notices; and documents that accompany hazardous materials.

“ESIGN does not apply” is not the same as “ink required”. It means the governing state law decides, and some of those laws allow electronic methods of their own. But it does mean you cannot point to ESIGN as your authority.

Notarisation is handled the other way round. Section 7001(g) says a requirement that a record be notarised, acknowledged, verified or made under oath is satisfied by the electronic signature of the person authorised to perform that act, together with all the information the other law requires.

The table below brings all three countries together, one row per document type, with the rule and the source it comes from.

How to check your document

Five questions settle most cases before anyone reaches for a pen.

1. Which law governs it? In Australia, Commonwealth or state; in the US, whether it falls in a section 7003 category.
2. Does it need a witness, and must the witness be present? A deed in England and Wales, yes. A Commonwealth statutory declaration, a video link will do.
3. Will it be registered, lodged or filed? Land registries, courts and regulators set their own format rules, and a file they reject has not been lodged.
4. What does the document itself say? A paper clause can override the general law.
5. What does the other side require? A lender or counterparty can insist on ink, and nobody can be forced to accept an electronic signature.

The short definition of the term, and why ink proves less than people assume, is in what a wet signature is.

Common mistakes

• Assuming one country’s answer travels. A UK deed rule says nothing about a Queensland one.
• Reading “exempt” as “paper only”. It means the general Act cannot be relied on; the specific law decides.
• A remote witness where presence is required. A witness on another screen may not be a witness at all.
• Print, sign and scan as a compromise. A scan is neither the original nor a recorded electronic signing.
• Ignoring the receiving party. A registry that rejects the file is the end of the argument.

Build it

Where electronic signing is allowed, the envelope records what a paper original cannot: the identity check each signer passed, the consent they accepted, their IP address, a hash chained audit trail and a PDF certified so later edits break the certification. Mixed execution works too. In the contractor agreement example the builder signs on paper before upload and only the contractor signs online, and in the loan agreement example the lender signs last in a session hosted in person by the sender, which the trail records. A witness can be added as a signer with a block headed WITNESS, as in the medical consent example, though that alone does not make them physically present. The legally binding page sets out what is recorded, and the tutorial send a document for e-signature covers the steps.