Complete guide to UK e-signature law in 2026: the Electronic Communications Act, eIDAS, qualified vs simple e-signatures, and which DocFila tier matches each use case.
Electronic signatures have been legally binding in the UK since the Electronic Communications Act 2000, and the position was reinforced by the Law Commission's 2019 report and the UK eIDAS Regulation. For the vast majority of business contracts — NDAs, employment offers, MSAs, statements of work, supplier agreements — a simple e-signature in DocFila has the same legal weight as a wet-ink signature.
There are narrow exceptions: wills, certain land-related deeds, and a handful of consumer credit documents that still require specific formalities. For everything else, the Mercury principle (R (Mercury Tax Group) v HMRC) and the Law Commission's guidance confirm enforceability.
1. Simple Electronic Signature (SES) — typed name, drawn signature, or click-to-sign. Default in DocFila. Admissible in court; the burden of proof rests on the party relying on it.
2. Advanced Electronic Signature (AES) — uniquely linked to the signer with cryptographic key material. DocFila uses public-key signing plus blockchain anchoring to satisfy AES requirements.
3. Qualified Electronic Signature (QES) — AES plus a qualified certificate from a UK-recognised Trust Service Provider. Required only for limited regulated transactions; available in DocFila Business as an add-on.
Wills, codicils and lasting powers of attorney still require physical signatures and witnesses under the Wills Act 1837 and Mental Capacity Act 2005.
Some land transactions: while a land contract can be e-signed under the Land Registration Act 2002, the registration deed itself currently still requires the wet-ink procedure or a Mercury-style print-and-sign workflow.
Certain consumer credit agreements regulated under the Consumer Credit Act 1974 retain prescribed-form requirements.
Every signed document in DocFila gets a SHA-256 fingerprint, a timestamped audit trail (signer IP, device, timezone, every view and click), and an optional Polygon blockchain anchor that lets any third party verify the document existed at signing time without trusting DocFila as a witness.
If a UK court ever asks 'how do you know this contract wasn't altered?', you can answer with cryptographic certainty using the public Verify explorer at docfila.com/verify.
Employment contracts and IR35 contractor agreements.
Tenancy agreements and assured shorthold tenancies (AST).
Supplier MSAs, NDAs and statements of work.
Board resolutions and shareholder consents.
Letters of intent, heads of terms, and term sheets.