How should solicitors implement electronic signatures without undermining compliance or client protection?

Solicitors should match the signature method to the document risk, verify the signatory’s identity, capture clear evidence of intent, and retain a complete audit trail. They also need documented client consent, secure document handling, and procedures that align with Law Society and SRA expectations. For deeds and other formal instruments, they must apply the stricter execution rules that still govern those documents.

Match the signature method to the document’s legal and operational risk

Electronic signatures are not one control for every use case. Solicitors should start by separating routine client authorisations from higher-formality documents, then choose a signing method that fits the evidential burden, the need for identity assurance, and the consequences if the signature is later challenged. For sensitive documents, the question is not just “can it be signed electronically?” but “can we prove who signed, what they intended, and when?”

That means the firm’s signing workflow should be risk-based rather than tool-based. A low-risk consent form can often use a lighter process than a deed or other formal instrument, but the same workflow should still preserve signatory traceability, version integrity, and a reliable record of the signing event. The practical issue is consistency: once a firm allows different levels of evidence, it must be able to justify why each level was appropriate.

Identity, intent, and the evidential record matter more than the click

The core compliance issue is not the presence of an electronic signature image or a confirmation button, but the strength of the surrounding evidence. Solicitors should be able to show how the signatory was identified, how intent to sign was captured, and how the final document was protected from post-signing alteration. A workable process also records the document version presented to the client, because a signature on an unstable document is much harder to defend later.

Where the transaction has higher stakes, firms should treat the signature event as part of the client file, not as a separate admin action. That usually means keeping timestamps, authentication steps, email or portal records, and the final executed copy together so the trail is easy to reconstruct. If the matter could later be disputed, the file should let another lawyer see not only that a signature exists, but why the firm regarded it as valid.

For higher-risk client journeys, it is sensible to align the signing flow with stronger access and authentication controls. The Client-Side Security Guide is useful here because the same discipline that protects documents from tampering and script abuse also supports trust in the signing interface and the integrity of what the client actually saw.

Use stricter execution steps for deeds and other formal instruments

Electronic signing is often acceptable in principle, but formal instruments still require careful handling. For deeds and other documents with stricter execution rules, the firm should confirm that the chosen signature process satisfies the legal formalities that apply to that document type, including witness requirements where relevant and any constraints on how execution is to be completed. A general electronic workflow should never be assumed to fit formal execution without checking the exact document class.

The safest approach is to build a document-type decision step into the workflow. If the document is ordinary client authority, the process can be lighter; if it is a deed or similarly formal instrument, the process should switch to the approved execution path and record the reason for that path. That reduces the risk of a technically successful signature that later fails as a matter of law or professional duty.

For firms operating across jurisdictions or dealing with cross-border identity proofing, the legal environment matters as much as the signing platform. eIDAS 2.0, the EU Digital Identity Framework is a useful reference point when the transaction touches electronic identification, trust services, or cross-border digital signature expectations.

Risk and Threat Considerations

Electronic signatures create exposure when firms confuse convenience with assurance. The main risks are identity spoofing, weak consent evidence, document substitution, and incomplete audit trails, any of which can turn a seemingly routine signing event into a later dispute over validity or authorisation. For solicitors, the practical danger is not only client challenge, but also internal inability to prove that the firm followed a defensible process.

Failure mechanism: A weak workflow can authenticate the wrong person, fail to capture clear assent, or allow a document to change after approval, which breaks the evidential chain that supports the signature.

Impact: The result can be an unenforceable signature, client complaint, professional negligence exposure, or a need to reconstruct the matter from incomplete records after the fact.

Standards & Framework Alignment

This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.

NIST SP 800-53 Rev 5 sets the technical controls, while ISO/IEC 27001:2022 defines the regulatory obligations.

Framework	Control / Reference	Relevance
ISO/IEC 27001:2022	A.5.15 — Access Control	Controls who may sign or approve documents and under what conditions.
	A.5.31 — Legal, statutory, regulatory and contractual requirements	Electronic execution must align with legal and professional obligations.
	A.5.33 — Protection of records	Signed documents and audit trails must be retained intact for later evidence.
Recommendation — Define access rules for signing workflows and restrict execution rights by role and need. Map signature workflows to the legal and regulatory obligations that govern each document type. Protect executed documents and signing records so they remain complete, authentic, and retrievable.
NIST SP 800-53 Rev 5	AU-2 — Event Logging	Signing events need recorded evidence of who did what and when.
	AU-10 — Non-repudiation	The process must support proof of origin and receipt for disputed signatures.
	SC-28 — Protection of Information at Rest	Executed documents and audit artefacts need protection from alteration or exposure.
Recommendation — Log signature events with timestamps, identity evidence, and document references. Implement non-repudiation controls that preserve trustworthy signing evidence. Protect signed documents and related evidence at rest with integrity-preserving controls.

Practitioner Guidance

What to verify: Before trusting any electronic signature process, verify three things: the signatory was identified at the right assurance level for the document, the client’s consent to electronic signing was recorded, and the executed version is immutably retained with the audit trail.

Decision rule: If the document is a deed, formal instrument, or anything likely to be challenged, use the stricter execution path first and treat convenience features as secondary. If the matter is low risk, lighter signing can be acceptable, but only if the firm can still explain the evidential basis later.

Common mistake: Teams often over-focus on the signature product and under-focus on file evidence. A visible signature is not enough if the firm cannot show who signed, what they accepted, and whether the document remained unchanged after execution.

Practitioner takeaway: The standard to aim for is not “electronic signature present”, but “execution can be defended if challenged”, because that is what protects both compliance and the client relationship.