A consulting engagement letter confirms the working relationship before any work begins. It should state the scope clearly enough that neither party is surprised later — what you will deliver, and just as importantly what is out of scope.
Spell out the fee structure (retainer, fixed fee, or hourly), the billing cadence, and the timeline with key milestones. Include expense handling, confidentiality, independence (you are not providing legal or audit advice), and a termination clause with notice periods.
When to send it
Send the engagement letter after the kickoff conversation but before any work starts. Most consultants send it the same day the scope is agreed, so the client can sign and return it before the first invoice.
Sample consulting letter
Dear Jordan,
Thank you for engaging me to support Riverbend Co. on its Q3 operational efficiency review. This letter sets out the terms of our engagement so we are aligned before we begin.
Scope of work. I will conduct a four-week operational review of Riverbend's order-to-cash process, including stakeholder interviews, process mapping, a bottlenecks analysis, and a prioritized recommendation report. The report will be delivered as a PDF with a 60/90-day implementation roadmap.
Fees. Fees are billed on a monthly retainer of $6,500, invoiced at the start of each month. The retainer covers up to 30 hours per month; time beyond that is billed at $200/hour and pre-approved by you in writing.
Timeline. The engagement begins on October 6, 2026 and concludes with delivery of the final report on November 3, 2026. Weekly status updates will be provided each Friday.
Expenses. Reasonable, pre-approved expenses (travel to your Portland office, software licenses) will be invoiced at cost with receipts attached.
Confidentiality and independence. I am not providing legal, tax, or audit advice. All information shared with me will be kept confidential. A mutual NDA, signed separately, governs the exchange of information.
Either party may terminate this engagement with 14 days' written notice; fees for work completed up to the termination date remain payable.
Please confirm by signing below. I look forward to a productive engagement.
Sincerely,
____________________
Alex Morgan
Independent Consultant
Frequently asked questions
Is an engagement letter the same as a contract?
An engagement letter is a type of contract — once both sides sign it's legally binding. It sets out scope, fees, and terms so expectations are clear before work starts.
Do I need one for every consulting engagement?
For anything beyond a quick one-off, yes. It protects both you and the client by defining scope, payment, and how the engagement ends.
What fee structure should I use?
Retainers suit ongoing work, fixed fees suit well-defined projects, and hourly suits uncertain scope. The generator handles all three.
How long should the engagement letter be?
One page is usually enough. It needs scope, fees, timeline, and termination — not legalese.
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