A prospect said yes on the call, got your engagement letter that night, and never came back. It happens more than partners like to admit — and it's almost never the fee.
What most firms send
Six pages of scope, indemnification, arbitration clauses, and a fee footnote. The prospect opens it on their phone at 9 pm, scrolls, feels overwhelmed, and puts it in a "later" pile they never return to.
The shape that converts
Three parts, in order, under two pages of readable text before the legal appendix:
- The relationship, in one paragraph. What you're doing for them, how often, in plain language. Not "professional services" — say "monthly close and a 20-minute CFO call."
- What's in, what's out, in plain lists. In-scope in one column, out-of-scope in another. Prevents 80% of scope creep arguments six months in.
- Fees, timing and how to say yes. One number per line, with billing cadence. A single "reply YES to this email to countersign" line — not a DocuSign gauntlet.
The tone
Sign it as the human they met, not "the firm." Prospects are choosing who to trust with their financial house. A named partner with a real signature block wins.
Subject line
"Engagement — monthly close for Acme, starting July" beats "Engagement Letter for Countersignature."
The tools directory has an engagement-adjacent generator — the invoice & payment terms kit — that generates this shape from a few fields about the client and scope.