Quick answer

An ROI model justifies a decision rather than causing one. Buyers overwhelmingly commit emotionally and then use arithmetic to defend that commitment internally, so a rigorous model handed to someone who has not decided gives them a more precise reason to keep thinking.

You built it properly. You used their numbers rather than benchmarks, you were conservative on the upside, and you showed the payback under a set of assumptions their own finance team supplied.

They received it well. Somebody said it was the most credible business case they had seen from a vendor, which was gratifying and, in retrospect, a strange thing to be told.

Six weeks later the deal is exactly where it was. Not lost, not objected to, just stationary, and every follow-up gets a version of the same reply about internal timing.

What a model actually does

Watch how buyers actually use business cases. They are built or requested after somebody has decided they want something, and they are used to defend that want to a person who was not in the room. The model is armour rather than persuasion.

That is why an excellent model handed to a buyer who has not decided produces such a specific kind of silence. You have given them a well-constructed answer to a question they were not asking, and the polite thing to do with it is to say it is credible and file it.

It also explains why the compliment is a bad sign. Being told your business case is the most credible one they have seen means it has been compared with others, which means you are in an evaluation rather than a decision.

Competing logic and confirming logic

The same numbers do opposite work depending on when they land. Arriving before the buyer has committed to an outcome, your model becomes an input to a comparison. It goes in a folder next to two others, and the buyer's job becomes weighing three sets of assumptions rather than deciding anything.

Arriving after commitment, the identical model becomes confirming logic. The buyer already wants this and is now assembling the case they will make internally, and your arithmetic is ammunition for an argument they intend to win.

There is a second cost to going early. Once a cost frame is established, every conversation after it is smaller, because the buyer is now managing a purchase rather than pursuing an outcome. That shrinkage is difficult to reverse and easy to avoid.

Run this before you build the model

The Spreadsheet Test

Before you spend a day on the business case, ask whether you can name, in the buyer's own words, the outcome this model is supposed to justify. Not the problem it solves. The future they said they wanted.

If you can quote it, build the model, because it will be used as armour by someone who intends to fight for this. If you cannot, the model is doing work that belief was supposed to do, and you are about to hand a comparison document to somebody who has not decided. Spend that day on the conversation instead.

  • Hold the economics until the buyer has described the outcome in their own words
  • Anchor every number to their stated destination rather than to a category benchmark
  • Treat a compliment about the model's credibility as evidence of comparison rather than progress
  • When price pressure arrives, ask whether the concern is the investment size or whether the approach reaches their goal

None of this is an argument against quantification, which is necessary and which ValueSelling does better than anything else in the market. It is an argument about sequence. The discipline is to hold the arithmetic until there is a destination for it to price, which is unnatural under quota pressure and worth the difficulty.

When you do, the model stops competing and starts confirming. The metric becomes their number rather than yours, the timeline becomes the date their own future stops being possible, and the case is one your champion can defend because they helped decide it.

That ordering is what our method builds, and it is why teams that install it stop losing to a rival with a slightly more optimistic spreadsheet.

Common questions

Why do ROI calculators fail to create urgency?

Because they justify decisions rather than cause them. Buyers commit emotionally and then assemble arithmetic to defend that commitment to people who were not in the room. Handing a model to someone who has not committed gives them a more precise reason to keep considering it.

When should you present a business case?

After the buyer has described the outcome they want in their own words. Numbers arriving before that become an input to a comparison and set a cost frame that shrinks every later conversation. The identical numbers arriving after become ammunition for an argument the buyer intends to win.

Is it a bad sign when a buyer praises your business case?

Frequently, yes. Being told it is the most credible case they have seen means it has been compared with others, which places you in an evaluation rather than a decision. Genuine commitment tends to produce questions about implementation rather than compliments about modelling.

Should you build a model at all if the buyer has not committed?

Build a short one if it is required to stay in a process, and do not mistake it for progress. The higher-return use of that day is the conversation that establishes what outcome the buyer wants, because that determines whether any model will ever be used as armour or filed as a comparison.