A business case is the internal document that sells your deal when you are not in the room — the problem, the math, the risk answer, and the precedent, packaged so your champion can defend it under questioning. Most reps never build one, which is why most deals die in a meeting the rep never attended. AI makes building a defensible case a two-hour job instead of a two-week one.
The Deal You Close Isn't the Deal That Gets Approved
You sell to people; budgets get approved by committees. Between your last great call and the signature sits an internal review where someone asks your champion "why this, why now, why this much?" — and your deal is only as strong as their answer. The business case is you scripting that answer in advance.
Block 1: The Problem, in Their Numbers
Start from your discovery notes and force quantification:
Prompt: "From these discovery notes, draft a problem statement using only facts the buyer told us. Convert every pain into a number where possible — hours, error rates, missed revenue, headcount time. Mark every number that is my inference rather than their statement, so I can verify it with the champion before it goes in writing."
The verification step is the credibility. A business case with one wrong number gets the whole document discounted.
Block 2: Three-Scenario Math
One ROI number reads like a pitch; three read like analysis. Build conservative, base, and aggressive scenarios, and lead with conservative. If the deal pays back on the conservative case, the conversation is over. Ask AI to build the model skeleton and — critically — list the buyer inputs it needs, so the champion co-authors the math.
Block 3: The Risk Answer
Every approver's silent question is "what if this fails?" Answer it before it is asked: implementation plan, success criteria at 30/60/90 days, and the exit ramp. Counterintuitively, showing the off-ramp increases approval odds — committees approve reversible decisions faster than irreversible ones.
Block 4: Precedent
Committees are pattern-matchers. Two or three similar companies that made this move, with outcomes, drops the perceived risk more than any feature list. Ask AI to draft the precedent paragraph from your case studies in the buyer's industry vocabulary.
Then Compress It
The finished case is one page plus an appendix. Run a final pass:
Prompt: "Compress this business case to one page. Every sentence must carry a number, answer a risk, or cite a precedent. Then list the five hardest questions a CFO would ask about it, with the strongest honest answer to each — that's my champion's prep sheet."
That prep sheet is the difference between a champion who forwards your PDF and a champion who wins the meeting.
Frequently Asked Questions
When in the deal should I build the business case?
Start it right after the discovery call that surfaces real numbers, and refine it as stakeholders add inputs. If you are building it during procurement, you are three weeks late.
What if the buyer won't share the numbers the math needs?
Use clearly-labeled conservative assumptions and invite correction. Reluctance to engage with the math at all is qualification data — it usually means you are not talking to someone who owns a budget.
Who should present the business case internally?
Your champion, always — which is why it must be written in their voice, their vocabulary, and their political context. Your job is to make them the smartest person in that room.
Put It to Work
Promptifi's library includes business-case, ROI-model, and champion-enablement prompts organized by deal stage. Browse the library.