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.