Engagement Letter

An engagement letter is the foundational contract used by consultants, law firms, auditors, accountants, and increasingly by think tanks and policy advisory shops to formalize a client relationship before substantive work begins. Unlike a handshake brief or an emailed scope, the engagement letter is intended to be signed and is legally binding in most jurisdictions, creating an enforceable record of what each side has agreed to.

Typical contents include:

• Scope of work: a precise description of deliverables, methodology, and exclusions.
• Fees and billing: hourly rates, fixed fees, retainers, expense pass-throughs, and payment terms.
• Timeline: milestones, draft dates, and final delivery.
• Responsibilities of the client: providing data, access to personnel, timely review.
• Confidentiality and IP: who owns work product, how confidential information is handled, and any publication rights.
• Conflicts of interest: disclosures and waivers, particularly important for law firms and auditors.
• Termination clauses: notice periods, kill fees, and obligations on wind-down.
• Governing law and dispute resolution: jurisdiction, arbitration, indemnities, and limitations of liability.

For auditors, engagement letters are not optional. International Standard on Auditing (ISA) 210, issued by the IAASB, requires auditors to agree the terms of an audit engagement in writing with management or those charged with governance. The American Institute of CPAs imposes a similar requirement under AU-C 210. Law firms in most U.S. states are bound by analogous duties under the ABA Model Rules of Professional Conduct, particularly Rule 1.5(b) on communicating fees.

For junior researchers and MUN delegates moving into policy consulting, the engagement letter is the document that converts an interesting conversation with a prospective client into a billable, defensible project. Reviewing one carefully — especially the scope, IP, and termination clauses — is standard practice before signing.