Sector guide

NDA for Consultants UK: Protecting Your Work and Client Relationships

When UK consultants need an NDA, which template to use (one-way, mutual or freelancer), the key clauses clients and consulting firms expect, and how IR35 affects your confidentiality obligations.

By Richard Wood, Founder9 min readUpdated 9 June 2026Last reviewed 9 June 2026consultantsfreelancer NDAmutual NDAone-way NDA

This is general information, not legal advice

NDASafe is a document preparation service, not a law firm. Our templates are legally reviewed against applicable UK law at the point of release, but every situation is different. Where significant value, unusual risk or a cross-border element is involved, take independent legal advice before you sign.

Why consultants need NDAs

Consultants sit at the intersection of multiple organisations, moving between clients and often working across competitor firms in the same sector. This creates a structural confidentiality risk: information absorbed at one client engagement can, consciously or not, influence work for another.

UK law provides some baseline protection through equitable confidence (Coco v AN Clark [1969]) and contractual implied terms, but these are expensive to enforce and depend on the information already having a quality of confidence. A signed NDA creates a clear, enforceable record of what was shared, when, and under what obligations.

Scenario	Recommended template
Client shares business plans, data or IP; consultant receives only	One-Way NDA (disclosing party)
Consultant shares proprietary methodology, pricing or tools; client receives only	One-Way NDA (receiving party)
Both sides exchange sensitive information during the engagement	Mutual NDA
Sole trader or limited-company contractor engaged for a defined project	Freelancer NDA (includes IR35 acknowledgement and IP assignment)

Key clauses a consulting NDA should include

Definition of confidential information — broad enough to cover written, oral, electronic and visually shared material; narrow enough to exclude publicly available information.
Permitted disclosure — to employees, sub-contractors and professional advisers (lawyers, accountants) who need to know, subject to the same obligations.
Return or destruction on request — at project close the receiving party returns or certifies destruction of confidential materials.
Survival clause — the obligation survives project termination; use 2–5 years for general business information, indefinite for trade secrets.
PIDA 1998 whistleblowing carve-out — mandatory for any NDA covering worker or employee relationships; prevents the NDA from silencing protected disclosures.
No licence granted — receiving confidential information confers no IP licence or right to use the information beyond the stated purpose.

IR35 status is set by the working relationship, not the contract alone

A contract can reflect contractor independence but cannot manufacture it. HMRC applies the substance test — control, substitution and mutuality of obligation — not just the paper terms. Take independent IR35 advice if your engagement is at the borderline.

Sub-contractors and supply chain confidentiality

Consulting firms frequently use associate consultants or sub-contractors to deliver client work. A client NDA signed by the firm typically needs to be 'flowed down' to any sub-contractor accessing client information — either by making the sub-contractor a party to the main NDA or by a back-to-back agreement.

The NDASafe Mutual NDA and Freelancer NDA both include a sub-contractor/associate clause requiring the principal to impose equivalent obligations on any personnel given access to confidential information.

Duration: how long should a consulting NDA last?

Most consulting NDAs use a two to five-year term for general business information. Trade secrets — client pricing models, proprietary formulas, customer lists — should survive indefinitely because they retain commercial sensitivity long after a project ends. NDASafe templates default to a three-year term with indefinite trade-secret survival; both are adjustable.

What consultants must not do under an NDA

Use a client's confidential information to benefit another client or your own business
Share client data with employees or associates who do not need it for the project
Retain documents, reports or data after the engagement ends without written consent
Refer to a client in marketing or case studies without explicit permission (even if no individual data is named)
Attempt to use the NDA to prevent a client from making a protected disclosure under PIDA 1998

UK NDA templates for consultants and contractors

NDASafe's Freelancer NDA is purpose-built for UK consulting engagements: IR35 acknowledgement, IP assignment, supply-chain flow-down, and full statutory carve-outs. The Mutual NDA covers consulting relationships where both sides share. £29 each or £79 for all eight templates, delivered as editable Word documents.

Step by step

1
Identify the information flow
Decide who is disclosing sensitive information. If only the client discloses, use a one-way NDA (disclosing party). If both parties share confidential material, use a mutual NDA or the Freelancer NDA with mutual disclosure selected.
2
Choose the right template
Consultants engaged as independent contractors should use the NDASafe Freelancer NDA — it includes IR35 acknowledgement and IP assignment options. Consultancies operating as a limited company advising a client typically use a mutual or one-way NDA.
3
Define confidential information precisely
List the categories of information being protected: client business plans, pricing, customer data, systems, product roadmaps, or your own proprietary methodologies. Vague definitions are harder to enforce.
4
Set the term and survival clause
Choose a duration for the confidentiality obligation — two to five years is typical for consulting engagements. Include an indefinite survival clause for trade secrets (formulae, client lists, pricing models) which have no natural expiry.
5
Sign before sharing
Exchange signed copies before any confidential information is disclosed. Both parties should keep a dated copy. NDASafe templates include a signature block with date fields and optional witness provisions.

Frequently asked questions

Do I need an NDA as a consultant in the UK?

Not always — but often yes. As a consultant you routinely access client business plans, financial data, systems, processes and commercial relationships. Without an NDA you rely on equitable confidence and implied duties, which are harder to enforce than a written agreement. Most clients and all regulated sectors (financial services, healthcare, legal) will expect a signed NDA before sharing anything sensitive.

Should a consultant use a freelancer NDA or a mutual NDA?

It depends on whether information flows both ways. If you share your own methodologies, pricing models or proprietary frameworks with the client, use a mutual NDA — both parties are disclosing. If only the client is sharing sensitive information with you, use a one-way NDA (disclosing party) naming the client as discloser. Consultants who want a single document that covers both scenarios often use the Freelancer NDA, which includes mutual or one-way options and IR35-aware language.

Does IR35 affect an NDA for a consultant?

IR35 (Chapter 10 ITEPA 2003) determines whether a contractor is treated as employed for tax purposes — it does not directly affect an NDA's confidentiality obligations. However, the way a consulting relationship is documented does affect IR35 status. NDASafe's Freelancer NDA includes an explicit IR35 acknowledgement so the contract reflects the contractor status of the relationship, which supports an outside-IR35 position.

What clauses should a consultant NDA include?

A consulting NDA should cover: a clear definition of confidential information (including written, oral and electronic); obligations on both parties' staff and sub-contractors; permitted disclosure to professional advisers; a term that survives project end (typically 2–5 years; indefinite for trade secrets); a return/destruction obligation at project close; and — for UK employment-adjacent work — PIDA 1998 whistleblowing carve-outs so the NDA cannot be used to silence statutory disclosures.

Who should sign first — the consultant or the client?

Either party can sign first. For a one-way NDA the disclosing party (usually the client) typically prepares and sends the document, then the receiving party (consultant) signs. For a mutual NDA, whoever starts the conversation usually sends the draft. What matters is that both parties sign before any confidential information is shared.

Can a client use an NDA to stop a consultant working for a competitor?

An NDA covers confidential information — it cannot, by itself, prevent you working for a competitor. Restrictions on competing work require a separate non-compete clause, which must be reasonable in scope, geography and duration to be enforceable under English law (see the Tillman v Egon Zehnder [2019] test). NDASafe's Freelancer NDA includes an optional, narrowly drafted non-solicitation block but does not include a broad non-compete.