Are Electronic Signatures Legal?

Yes: electronic signatures are legally binding in the UK for the vast majority of business documents, including contracts, engagement letters, approvals and most agreements. Their validity rests on the Electronic Communications Act 2000 and the UK eIDAS regulation, and the Law Commission confirmed in 2019 that an electronic signature is capable of executing a document wherever a signature is required, provided the signer intends to sign. A small set of documents, such as wills, still needs wet ink.

That's the short answer. The longer one matters for regulated firms, because "is it legal?" turns out to be the wrong question. The better one is "could I prove it?" - and that's where electronic signatures don't just match wet ink, they beat it.

Are electronic signatures legally binding in the UK?

Under English law, a signature's job is to show that the signer intended to authenticate the document. The Electronic Communications Act 2000 made electronic signatures admissible as evidence, and the UK eIDAS regulation (retained and amended after Brexit) establishes that an electronic signature cannot be denied legal effect solely because it's electronic.

In 2019 the Law Commission put the remaining doubts to bed, confirming that electronic signatures can validly execute documents, including most contracts and deeds where the other formalities are met.

Milestones have kept extending the territory. Since July 2020, HM Land Registry has accepted witnessed electronic signatures, bringing property transactions like leases and mortgages into scope. For firms working across both our markets, Australia's position is similar: the Electronic Transactions Act 1999 and its state equivalents give electronic signatures general validity, which is why e-signing is now routine on BAS-season document runs.

A few categories still call for wet ink or extra formality - wills are the classic example, and some deeds still require a witness (which can itself be handled electronically in the right circumstances). If a document type is unusual, check the specific requirement. For the everyday paperwork of a professional firm, though, the legal question is settled.

Are electronic signatures more enforceable than wet signatures?

In practice, often yes - because enforcement disputes are rarely about the law, they're about evidence. A wet signature on page 12 proves very little by itself: not when it was signed, not what version was signed, not whether the signer saw the schedule that was stapled on afterwards.

A properly executed electronic signature carries its evidence with it: the exact document version, a timestamp, the signer's verified identity, and an audit trail of every step from sending to completion. The strongest systems go further and keep the context too - the messages, files and decisions around the signature held in one record - so that two years later, "who approved what, and on what basis?" is a scroll, not a search party.

The quotable version: a wet signature proves someone once held a pen. An electronic signature proves what happened.

But couldn't anyone sign my name online?

Identity is the worry people raise most, and it's the one modern platforms answer best. Signer identity can be verified through:

• A one-time passcode sent to the signer's registered email address or phone
• Delivery to a verified, private channel rather than a public one
• Official ID verification where the stakes demand it
• Witnessed electronic signatures for documents that require them

Compare that with the postal equivalent, where a document sits on a kitchen table for a week and comes back with a biro squiggle nobody can date. For regulated work, some counterparties also impose their own criteria: financial planning firm Informed Choice, for example, works with providers including Transact, Fidelity, M&G and Aviva, each with specific eSignature requirements, and needed a signing process that could be tailored to satisfy every one. A signature is evidence with a format someone else will check - pick a platform that can match the format.

What are the benefits of electronic signatures for professional firms?

Speed that changes what's possible, not just how fast it happens. Larking Gowen, a Top 40 UK accountancy firm with 450 staff, used to print, post and wait, or password-protect PDFs and hope; moving to electronic signing cut the turnaround of tax returns and accountancy paperwork from weeks to hours.

At Ketton Wealth Management, a Suffolk financial planning firm, document turnaround fell roughly 90%, from about seven days to about an hour - and as financial planner Steven Burch puts it, "same-day pension withdrawals was absolutely impossible before."

A better client experience. The biggest adoption barrier was never legality; it was portals. When clients have to create accounts and remember passwords to sign, they revert to printing and scanning. The systems that win send a secure link the client simply opens and signs, no login required.

Lloydbottoms, a Bristol accountancy practice, retired its old client portal for exactly this reason: "I haven't had anybody come back and say 'I can't work with this' - it's easier for clients than our old portal."

The chase runs itself. Automatic reminders replace the follow-up email you were going to write on Friday. At Serenity Accounts, replacing standalone signing software with signing built into the client file cut time spent chasing signatures by roughly half.

Filing happens by itself. This is the benefit standalone signing tools can't deliver: when signing lives inside your document management system, the signed document files itself against the client with its audit trail attached, instead of landing back in an inbox waiting to be saved somewhere sensible.

Volume economics. If your firm signs at scale, per-envelope pricing punishes success. ARTO, a US manufacturer sending 6,000 to 7,000 order confirmations a year, cut its workflow tool costs by 67% moving from per-envelope pricing to flat per-user pricing with unlimited signatures. "If you're a high-volume signer," as their director of design and technology puts it, "it's a no-brainer." A tax-season document run has the same shape.

Lower costs, less paper. Printing, postage, recorded delivery and scanning all disappear, along with the storage space the paper used to occupy.

What should accountants and advisers look for in an e-signature tool?

• Audit-ready evidence: timestamped, immutable records of who signed what, when, with the document version locked
• No-password signing: clients sign from a secure link, on any device including mobile, with nothing to remember
• Precise signature placement: signatures, initials and dates exactly where the document requires them, not defaulted to the back page
• Multi-party sign-off with reminders: directors and couples sign in sequence or together, with the chasing automated
• Automatic filing: the signed document lands in the client's file with its context, not in someone's inbox
• Sensible pricing: unlimited signatures on a per-user basis, so a busy January doesn't come with a surcharge

Electronic signatures are legal, more evidential than ink, and long past the point of debate for professional firms. The real decision is whether signing stands alone or lives inside the client file, where the evidence keeps itself. To see the second version working on a real engagement letter or set of accounts, explore Workiro's audit-ready eSignatures or book a 15-minute demo.

Frequently asked questions

Are electronic signatures legal on engagement letters and accounts approvals?

Yes. Engagement letters, letters of representation and client approvals of accounts and returns are contracts and confirmations that English law allows to be signed electronically, and the practice is now standard across UK firms. The signed document plus its audit trail typically provides stronger evidence than a returned scan.

Which documents still need a wet signature in the UK?

A small set, most notably wills. Some deeds require a witness, though HM Land Registry has accepted witnessed electronic signatures since July 2020. If a document type is unusual or high-stakes, check its specific execution requirements before relying on any signing method.

What makes an electronic signature valid?

Intention to sign and authenticate the document, plus reliable evidence connecting the signature to the signer. In practice that means verified delivery to the signer, a record of the exact version signed, and a timestamped audit trail of the signing steps.

Are electronic signatures legal in Australia?

Yes. The Electronic Transactions Act 1999 (Cth) and equivalent state legislation give electronic signatures general validity in Australia, with a small number of excluded document types. Australian accounting firms routinely use e-signing for BAS and tax return approvals.