Consulting Engagement Letter: Scope, Fees and AI-Use Wording

A consulting engagement letter should say what you will deliver and what you will not, how and when you are paid, how changes are agreed, who owns the work, how confidential information is handled, and exactly how AI tools are used. Keep each clause short, specific and checkable, then have a solicitor review it.

The clauses below are an illustrative template, not legal advice. Wording that works in one place may be unenforceable or unwise in another, and a solicitor who knows your sector and client base should read your final version. What I can do is show you the clauses that matter, the choices inside each one, and the plain-English AI wording that more clients now expect to see. Words in square brackets are placeholders you fill in.

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The shape of the letter

For a small engagement, ten sections cover nearly everything. They are listed here in the order a client will read them, which is also the order of disputes: scope first, money second, everything else after.

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1. Parties and background
2. Scope: services and deliverables
3. What is outside scope, and assumptions
4. Timetable and client responsibilities
5. Fees, expenses and payment
6. Change requests
7. Confidentiality and data handling
8. Use of AI tools
9. Ownership of work and use of your name
10. Term, ending the engagement, liability and signatures

I walk through each with sample wording, a filled-in example for a made-up engagement, and what usually goes wrong. The made-up engagement is a six-week operations review for an eight-person roofing company, fixed fee, with a written report and a half-day handover session.

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Clause 1 and 2: parties, background and scope

Name both parties exactly as they appear in company records, not as people talk about them. Then describe the engagement in one sentence of background and list the services as activities and the deliverables as things the client can hold.

1. Parties. This letter is between [Your practice name] ("I", "me")
   and [Client company name] ("you", "the Client").

2. Scope. I will provide the following services (the "Services"):
   (a) Review of the Client's quoting, scheduling and invoicing steps
       over [six] weeks starting [date].
   (b) Up to [six] interviews of up to [60] minutes with staff you choose.
   (c) A written report of no more than [20] pages, delivered by [date],
       with up to [eight] recommendations ranked by effort and benefit.
   (d) One [half-day] handover session by video or in person.

Numbers do real work here. "Up to six interviews" and "no more than 20 pages" are limits a client can see and a dispute can measure. "Comprehensive review" is not a limit; it is an invitation to argue about what comprehensive means. The most common drafting fault in consulting letters is a scope full of verbs without quantities.

Clause 3: what is outside scope and the assumptions you rely on

This is the clause that prevents the argument at week five. List the adjacent things the client might assume are included, and state the assumptions the fee depends on.

3. Outside scope. The Services do not include: selecting or
   configuring software; implementing recommendations; reviewing
   financial statements or giving accounting, legal or tax advice;
   staff training; ongoing support after the handover session.

   Assumptions. The fee assumes that: you give me access to the people
   and documents listed in section 4 within [five] working days of
   asking; the Client has no more than [three] sites; and the Client
   makes decisions within [five] working days.

A short illustration of why it matters. In the roofing example, the owner assumes "operations review" includes setting up the new scheduling tool. It does not; the letter says so. Without the clause, the consultant either does the work for free or has an awkward conversation about money in week five. With it, the conversation is about a change request, which is much easier. The tutorial on scope creep in AI projects goes deeper on handling the moments when a client pushes at those edges.

Clause 4: timetable and what the client must provide

Delays usually come from the client's side: documents arrive late, the person you need is on holiday. Say what you need, from whom and by when, and say what happens to the timetable if it does not arrive.

4. Timetable and your responsibilities. You will: nominate a
   point of contact; provide [list of documents] by [date]; make
   staff available for interviews; and review draft deliverables
   within [five] working days. If you are late, the dates in
   section 2 move by the same number of days, and I may charge for
   any resulting extra time under section 6.

The sentence "the dates move by the same number of days" is short, fair, and removes the usual dispute about whose fault a late report is.

Clause 5: fees, expenses and payment

There are three common structures, and the letter should state one clearly: a fixed fee for defined scope, time and materials at a day or hourly rate, or a retainer for a block of time each month. The comparison of fixed-scope and hourly work covers the trade-offs, and the pricing models tutorial adds retainers and value-based fees. For the letter, the choice only changes which of these sample clauses you keep.

5. Fees. The fee for the Services is [$14,400], payable in three
   instalments: [40%] on signing, [30%] on delivery of the draft
   report, [30%] on the handover session. Invoices are payable
   within [14] days. Late payments carry interest at [x]% a month,
   as allowed by the law that governs this letter.

   Expenses. Reasonable travel and software costs that you have
   approved in advance are charged at cost. No expense over [$200]
   is incurred without your written approval.

   Pauses. If the work is paused for more than [30] days at your
   request, I may invoice time spent to date and re-quote the rest.

Here is a quick sum for the roofing example, labelled illustrative. Fixed fee $14,400 over six weeks. The consultant expects about 15 hours a week of billable-equivalent work, which is 90 hours, so the effective rate is $160 an hour. If scope grows by two interviews and a second site, say 12 extra hours, the change clause (below) should price that at the same rate: about $1,920. The client sees the arithmetic and can say yes or no, rather than discovering it on an invoice.

Tie instalments to events you control, such as delivery of a draft, not to the client's approval, which is outside your control. If a client is slow to approve, you do not want your cash flow waiting on them.

Clause 6: change requests

A change clause turns scope creep from an argument into a process. It does not need to be long, but it needs to be written down and used.

6. Changes. If you ask for something outside section 2, or the
   assumptions in section 3 stop being true, I will tell you in
   writing what it affects: time, cost and dates. Work on the
   change starts only when you approve it in writing (email is
   enough). Extra work is charged at [$160] an hour unless we
   agree a fixed price for it.

The words "email is enough" make the process cheap enough to be used. A change form that takes a day to complete gets skipped, and then you have changes with no record.

Clause 7: confidentiality and data handling

Keep it two-way and in plain terms. Define what is confidential, state the permitted use, list exceptions, and say how long it lasts. A short version for a small engagement:

7. Confidentiality. Each of us will keep the other's confidential
   information secret and use it only for this engagement.
   Confidential information means anything marked confidential or
   that a reasonable person would see as such, including customer
   lists, pricing, financial data and staff records. This does not
   cover information that is public through no fault of ours, that
   we already knew, or that we must disclose by law. This applies
   during the engagement and for [three] years after it ends.

   Personal data. If I handle personal data for you, I will do so
   only on your instructions and keep it for no longer than needed.
   Where data-protection law requires a separate agreement, we will
   sign one before I receive that data.

The personal data paragraph is a flag, not a solution. If you will see customer records, employee files or health information, a solicitor should advise on what extra agreement you need. Many consulting engagements can be run without receiving personal data at all, by working from anonymised extracts; that is often the simplest way to reduce risk, and it should be stated as a client responsibility in clause 4.

Clause 8: the AI-use clause, in plain words

This is the clause clients now look for. It does three jobs: it says which AI tools you use and for what, it says what you will not put into them, and it keeps responsibility for the work with you. Here is a version for a consultant who uses AI for drafting and analysis:

8. Use of AI tools. I may use AI tools, such as general-purpose
   chat assistants and document tools, to help with drafting,
   summarising, analysis and formatting. When I do:
   (a) I use business or paid plans whose terms say that customer
       content is not used to train their models by default, and I
       check this when a plan changes;
   (b) I do not put into an AI tool your personal data, customer
       names, passwords or any information you have told me not to
       share, unless you approve this in writing first;
   (c) where practical I remove names and identifying details
       before using an AI tool on your material;
   (d) I read and check everything an AI tool produces before it
       reaches you, and I am responsible for the content of my
       deliverables whether or not AI helped produce them; and
   (e) you may ask me not to use AI tools on your material, and I
       will agree where it is practical, though it may affect
       time and cost.

A few notes on the choices inside it. Clause (a) states a practice you must actually follow, so check each vendor's current business terms rather than assuming; settings and plan terms change. Clause (b) is where a cautious client will push: some will want a blanket ban on any client information in AI tools, and your reply is clause (e) plus a stated effect on cost. Clause (d) is the one that matters most. It prevents the argument "the AI got it wrong", because the letter already says that you own the result.

For a client in a regulated field, you may need to go further: naming the tools, keeping logs of what was entered, or promising no AI on regulated data at all. Treat those as options the client asks for, price them, and put them in the letter as a numbered addition rather than a verbal promise. The law firm version of the AI clause shows how a profession with stricter duties words it, and it is a useful comparison before you decide how far to go.

Clause 9: ownership, your name and reuse

Decide who owns what. A common and fair position: the client owns the deliverables once paid in full, you keep your pre-existing methods, templates and know-how, and you may reuse general lessons without the client's confidential information.

9. Ownership. When you have paid in full, you own the final
   deliverables. I keep ownership of my pre-existing tools,
   templates and methods and give you a non-exclusive licence to
   use them as part of the deliverables. I may reuse general
   know-how, but not your confidential information. I will not
   name you as a client without your written permission.

The last sentence matters for the case-study route many consultants use for marketing. If you want to publish results, ask for permission in the letter, as a tick-box option rather than an afterthought. Because AI may have helped draft deliverables, some clients also ask who owns AI-assisted material. The honest answer depends on the law where you operate, and it is a question for the solicitor, not something to settle by guessing in a clause.

Clause 10: ending the engagement, liability and signatures

Allow either side to end the engagement with written notice, set out what is payable on early termination (work done to date, plus any committed costs), and include a limit on your liability. The cap is a legal judgement. A typical shape is a cap by reference to the fees paid, but whether that is allowed, and how, varies. Do not copy a liability clause from another letter without a solicitor reading it. Close with governing law and a signature block with date, and state that the letter replaces earlier discussions.

10. Ending. Either of us may end this engagement by giving
    [14] days' written notice. You will pay for work done and
    approved costs incurred up to the end date.
    [Liability and governing-law wording: to be settled with a
    solicitor.]

Signed for [Client company name]: ____________  Date: ______
Signed for [Your practice name]:   ____________  Date: ______

When the client edits your AI clause: three realistic redlines

Larger clients often send the letter back with changes. The AI clause draws more of them than any other, so decide in advance what you will accept. Here are three typical edits and a sensible response to each. They are illustrative, and your solicitor's view comes first.

"No AI tools may be used on our information." This is a reasonable request from a client with sensitive material. Accept it for their material, and state the effect: drafting and analysis that you would normally speed up will take longer, so the fee or timetable changes. Put the adjusted number in the letter so it is a decision rather than a hidden cost. Then make sure your team and your tools respect it: if your note-taking app transcribes every call by default, switch that off for this client, and record that you did.

"List every AI tool you use and notify us of changes." Workable if the list is short. Offer a schedule at the back of the letter naming the categories and tools, and promise notice of a new tool before it touches their material. Avoid promising to name every plug-in or feature, because vendors add AI features to ordinary software without warning, and you cannot promise what you cannot see.

"You warrant that deliverables are free of AI-generated errors." Resist this. No one can warrant it, and it turns a normal professional-care standard into an absolute one. A fair counter: you will review all deliverables with reasonable skill and care, you are responsible for their content, and you will correct errors you are told about within a stated time. Whether to accept anything stronger is a question for your solicitor and your insurer.

Adapting the letter to three other kinds of engagement

A monthly retainer. Replace the fixed fee with a monthly amount for a stated number of hours or a stated set of tasks, and add three things: what happens to unused hours (lapse or roll over for one month), a notice period of 30 days, and a clause saying work above the allowance is billed at your day rate only if the client has approved it. Without the allowance and the approval rule, a retainer slides into unlimited work.

A diagnostic followed by optional implementation. Write the diagnostic as the engagement and describe the implementation as a separate, later letter. This keeps the first letter short and priced, and it means the client chooses the second stage with evidence in hand. The tutorial on packaging a fixed-scope diagnostic shows how to define one so the letter can state its limits.

An insurance broker's advisory project. Suppose a consultant is helping a small insurance brokerage document its renewal process. The letter changes in two places. The confidentiality clause must say that policyholder data stays out of scope, and that all material shared will be anonymised or synthetic. The AI clause adds a line that any AI tool is used only on process descriptions and templates, never on policyholder records. That one change keeps a broker's regulatory duties out of the consultant's lap, and it is much easier to agree at the start than to untangle later.

A scope table that makes the letter easier to sign

Clients read tables faster than clauses. Attach a one-page schedule that lists every deliverable with its limit, owner and date. The text of clause 2 then points to the schedule, and anything not in the schedule is outside scope by default. A filled-in example for the roofing review (illustrative):

Notice the "client provides" column. It turns the client's duties into a visible list, and it is easier to point at a table cell in week four than to quote a clause. If AI helps with any of these, nothing in the table changes: the AI clause covers the method, the schedule covers the product.

Sending and signing without friction

Most letters stall in someone's inbox. Send it with a short covering email that names the three clauses clients ask about most (scope, fee, AI use), offers a ten-minute call to go through it, and states the start date as conditional on signature. Use an e-signature service if the client prefers it; check the current plans on the vendor's own page before you pay, because prices and limits change. Keep the covering email short and specific: "The fee is $14,400 in three payments, the report is 20 pages at most, and section 8 explains how I use AI tools on your material. If you want any of that changed, tell me before you sign."

When a client signs without questions on a first reading, it is worth a quick call anyway. A client who signs a letter they have not understood will remember the surprises, not the signature.

Using AI to draft the letter without trusting it

An AI assistant is useful for the first pass and for plain-English tidying, and unreliable on the legal substance. A sensible prompt:

Here is my engagement letter template for [type of consulting].
Check it for: ambiguous words (such as "comprehensive" or
"reasonable"), scope items with no quantity, places where a client
could assume something is included, and clauses that contradict
each other. Do not rewrite the legal terms. List problems only.

A likely and useful output (illustrative) would flag "up to eight recommendations" as clear but "ongoing support" in the exclusions as vague about duration, and notice that section 6 refers to an hourly rate not stated in section 5 if you forgot to include it. That kind of consistency check is worth having. What you should not do is ask a chatbot to "write me a legally binding contract" and send the result: it will produce confident clauses with no knowledge of your situation, and the wording may not hold up. Use the draft to get a better first version to a solicitor, which can save you time and their fees.

Four ways letters go wrong in practice

Scope by adjective. "Full audit of marketing". Fix: count things. Number of channels, interviews, pages, recommendations.

Fee without a trigger. "Payable on completion", where completion is undefined. Fix: tie each instalment to a dated event you control.

A silent AI policy. You use AI tools, the letter says nothing, and the client finds out from a metadata tag in a document. Fix: clause 8, sent before work begins.

Signed after the work starts. A verbal start, a signed letter in week three. Everything that went wrong in weeks one and two is outside the terms. Fix: no work before signature, and a short email saying so when the client is keen to begin.

Checking the letter before it goes out

1. Read it as the client. Is every number and date filled in, and does each deliverable have a limit?
2. Check that the fee in clause 5 matches the proposal and any email quote.
3. Check clause 8 against what you actually do. If you use a tool the clause does not describe, change the clause or the practice.
4. Check cross-references: clause numbers that point to the wrong section are common after edits.
5. Send it to a solicitor with a specific question list: liability cap, governing law, personal data, ownership of AI-assisted material.
6. Store the signed version where the engagement team can find it, and diary a review of the template every six months, because AI tool terms and the law both move.

The letter is the cheapest risk control in a consulting practice. A page of well-chosen wording at the start can save a long conversation later, and the AI clause tells the client, before they ask, that you take their information seriously.

Questions about consulting engagement letters

Is an engagement letter the same as a contract?

Often it is the contract, if it contains an offer, acceptance and payment terms and both sides sign. Some firms pair a short letter with longer standard terms. Either way, have a solicitor confirm that yours is enforceable where you and the client operate.

Should I tell clients I use AI tools?

Yes, in plain words, before you handle their information. Say which kinds of task you use AI for, that you review the output, and what you will not put into an AI tool. Clients tend to ask anyway, and a clear clause answers it in advance.

Can the letter promise results?

Avoid promising outcomes you do not control. Describe deliverables and activities, and state any measures as targets or assumptions. A clause that says the client's results depend on factors outside your control protects both sides from a mismatch of expectations.

How long should the letter be?

For a small engagement, two to four pages is typical. Short is fine if every clause is specific. Padding with legal-sounding boilerplate you do not understand is riskier than a plain letter a solicitor has tidied.

Further reads

• AI Engagement Letters for Accountants: Faster Drafts, Clear Scope — The accountants' version of an AI-aware engagement letter.
• AI Consulting Report Writing: From Findings to a Client-Ready Draft — Draft the report your letter promises, with AI under control.
• What a Typical AI Consulting Engagement Looks Like, Week by Week — What a typical engagement looks like week by week.
• AI Consulting Contracts: 9 Clauses to Check Before You Sign — The same topic from the client's side of the table.
• AI for Chartered Accountants: What to Tell Clients About Your AI Use — How another profession words its AI disclosure.
• Best AI Tools for Management Consultants: Seven From Research to Decks — Seven AI tools for independent consultants from research to decks, with a confidentiality tier rule, costs and a worked two-week diagnostic.
• AI Survey Analysis for HR Consultants: Coding Employee Comments Safely — Code employee survey comments into themes with AI, spot-check the sentiment, and apply anonymity thresholds before anything reaches a slide.
• Confidential Information Memorandum AI: A Business Broker's Workflow — A broker's workflow for drafting a CIM with AI: outline, financials into narrative, a line-by-line fact-check and confidentiality rules, plus Flippa's builder.
• Consulting Utilisation Rate: Track It Weekly and Price Projects With AI — Billable versus available hours, bench time, a weekly AI roll-up from timesheets and a worked project price checked against your rate card.
• Can Consultants Use ChatGPT With Client Data? NDAs and Settings — A clause-by-clause NDA check and a redaction workflow for consultants who want to use ChatGPT on client work.
• AI Tools and AI Development: The Complete 2026 Guide — the AI hub, including every tutorial in the AI-for-business series.

Sources: general contract practice; no vendor pricing is used. This is an illustrative template, not legal advice, and any letter should be reviewed by a solicitor before use.