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A client signs your proposal on their phone in under two minutes. It’s quick and convenient, and then a small doubt creeps in: would that signature actually hold up if the client later disputed the deal?
UK law has recognised electronic signatures since 2000, and they’re fully permitted for the everyday paperwork most small businesses rely on, from client contracts to invoices. That’s why so many owners now use an e-signature tool for small businesses instead of printing, signing, scanning and chasing paper around.
There are still a handful of documents where the rules are stricter, though. Knowing where those lines sit, and how to keep the right evidence behind every signature, will save you from an unpleasant surprise later.
What UK Law Actually Says
Two pieces of legislation do most of the work. Section 7 of the Electronic Communications Act 2000 makes electronic signatures admissible as evidence. The UK eIDAS Regulations, retained from EU law after Brexit, set out the different types of electronic signature and how they’re recognised. The Law Commission also examined the topic in its 2019 report on the electronic execution of documents.
The three types of electronic signature
- Simple electronic signature (SES): any data in electronic form that is attached to or logically associated with other data and used by a signatory to sign.
- Advanced electronic signature (AES): uniquely linked to the signer, capable of identifying them, created using data under their sole control, and linked to the signed data so that any later change is detectable.
- Qualified electronic signature (QES): requires a qualified certificate from a trust service provider approved by the Information Commissioner’s Office (ICO), and is only needed for narrow regulatory uses.
For more on the legislation and recent changes, this overview of e-signature law in the UK covers it in depth.
Documents You Can Sign Electronically
Simple and advanced electronic signatures are fully permitted for the paperwork that keeps a small business running, including:
- Commercial contracts and service agreements
- Non-disclosure agreements
- Employment agreements
- Invoices and purchase orders
- Software licences
- Short-term leases of under three years
- Insurance contracts and banking documents
Documents That Need Extra Care
Deeds
Deeds can be signed electronically, but the witness must be physically present at the signing, so watching over a video call doesn’t count. Land transfers and long leases go a step further. HM Land Registry runs its own process for witnessed electronic signatures, set out in its Practice Guide 82, so check with your solicitor before signing anything property-related.
Documents that can’t be signed electronically
A few documents remain paper-based:
- Wills and codicils, which must be signed in wet ink under the Wills Act 1837. The temporary allowance for video witnessing expired on 31 January 2024.
- Lasting powers of attorney, which are currently paper-based through the Office of the Public Guardian, with a digital channel rolling out through 2026 under the Powers of Attorney Act 2023.
- Family law documents, such as those relating to marriage, divorce and adoption.
If you’re ever unsure about a specific document, a quick check with a solicitor costs far less than relying on one that turns out to be invalid.
Why Your Audit Trail Matters
UK law doesn’t mandate a specific format for an electronic signature. If a signature is ever challenged, though, courts expect evidence that it’s reliable. That’s where your audit trail comes in.
A reliable audit trail should record:
- How the signer was identified, for example through their email address and an optional one-time code
- Timestamps for each step of the signing process
- IP addresses linked to the signer’s actions
- The authentication steps taken, with the final document sealed so that any later change is detectable
Keep records for the right length of time
A signature is only useful if you can still find it when you need it. As a guide:
- Simple contracts: six years, under the Limitation Act 1980
- Deeds: twelve years, under the same Act
- Employment records: six years after employment ends
- Tax records: six years, as required by HMRC
Store the signed document and its audit trail together, so the evidence never gets separated from the contract it supports.
Don’t forget data protection
Signed documents usually contain personal data, which means UK GDPR and the Data Protection Act 2018 apply. Choose a provider that stores documents securely, and make sure you know where your data is held.
A Simple Checklist for Small Business Owners
- Use electronic signatures for everyday contracts, NDAs, employment agreements, invoices and supplier paperwork.
- Flag deeds, property documents, wills and powers of attorney for a solicitor’s input.
- Choose a signing tool that produces a full audit trail automatically.
- Keep signed documents and their audit trails together, for at least as long as the retention periods above.
- Check where your signed documents are stored and who can access them.
Electronic signatures are a faster, better-documented way of handling paperwork you already deal with every week. The signature itself takes seconds. The evidence behind it is what makes it count.
This article is general information and isn’t legal advice. For specific situations, speak to a qualified solicitor.
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