The Model Is Not the Deal

Large CAPEX and M&A decisions are often presented as if they are supported by sophisticated financial models.

The project clears the hurdle rate. The acquisition creates positive NPV. The sensitivity table shows an acceptable downside case. The board pack contains IRR, payback period, scenario analysis, and valuation support.

On paper, the decision looks financially justified.

But in practice, big investment decisions are rarely made by models alone.

This is not because models are useless. They are essential. Without a model, management has no common language for discussing economics, cash flow, risk, and capital allocation.

But the model itself is not the decision.

It is a tool for structuring the debate.

The real decision sits somewhere between financial analysis, strategic rationale, downside protection, governance, organizational capability, and management judgment.

This is the reality CFOs face.

In the rest of this article, I discuss:
- why the CFO is not the sole decision-maker,
- why models organize uncertainty but do not decide,
- and why capital allocation often fails when finance says stop but the organization does not.

A CFO does not solely decide large CAPEX or transformative M&A transactions alone.

This is especially true when the investment can materially affect the company’s balance sheet, growth trajectory, or strategic direction.

The business unit may push the opportunity. The CEO may see it as a compelling, strategic necessity. The board may focus on whether the company can afford not to act.

But the CFO’s role is different.

The CFO is not supposed to be the internal promoter of every pitched investment idea. Their job is to provide neutral decision support based on firm data: cash flow, funding capacity, capital structure, downside exposure, return expectations, and the implications for shareholder value.

In that sense, the CFO is often less like a deal champion and more like an internal referee.

But even the best referee does not decide the game alone.

IRR, NPV, payback period, and scenario analysis are all useful.

They challenge management to define assumptions, expose whether the economics are plausible, make trade-offs more visible, and help compare alternatives.

But in real corporate decision-making, the conclusion can change quickly when assumptions move.

A slightly higher utilization rate can make a warehouse expansion look attractive. A slightly slower ramp-up can destroy the IRR. A small change in terminal value assumptions can break an M&A deal. A different working capital assumption can radically change the funding requirement.

This is why models often do not “prove” the answer.

They organize the uncertainty.

In practice, corporate finance logic is often less persuasive inside management meetings than outsiders may imagine. A textbook NPV argument may be analytically correct, but it may not be enough to overcome strategic urgency, competitive pressure, internal politics, or the CEO’s conviction that the company must act now.

That does not mean finance does not matter.

It means finance is only one input into a broader decision architecture.

One practical example stayed with me.

I once saw an overseas business venture continue to generate losses of roughly USD 3M per year for five consecutive years. Financially, it should have been clear that the business needed to be restructured, downsized, or even exited.

Yet that financial logic never fully translated into action.

Instead, additional funding requests kept being approved, including new capital to hire more sales staff and software developers. The parent company’s overall performance remained relatively solid after Covid, which reduced the sense of urgency. In the end, the decision to delay withdrawal was driven less by financial discipline than by the owner-CEO’s judgment and persistence.

What struck me hard was not only the weak economic logic.

It was the governance failure around it.

No one clearly owned the accountability. No one was forced to answer, in hard financial terms, whether this “rescue” capital still deserved to be allocated to the business.

This is where the theory of capital allocation meets the reality of organizations.

Finance may show that the business should stop.

But stopping requires governance, ownership, and authority.

Without them, losses can continue even when the spreadsheet already gave the answer.

The crux is not that a financial model is useless.

The gist is that Excel cannot answer every question that matters.

A model can certainly show whether a project clears a hurdle rate, how valuation changes in response to varying assumptions, and whether funding looks available under a base case.

But it cannot decide whether the strategic rationale is strong enough. It cannot force management to stop a project when the business on the ground asks for more time and financial resources. It cannot assign ownership after approval. And it cannot make a board ask why capital is still being allocated to a business that no longer deserves it.

This is why M&A and large CAPEX decisions are not made by models alone.

They are made by people, under uncertainty, inside organizations, with imperfect accountability.

And that explains why the CFO’s role does matter.

Not because the CFO always says yes or no.

But because someone must drive the organization to ask:

What must be true?

What if we are wrong?

Who owns the outcome?

And when should we stop?

In the next newsletter, I will discuss what often happens after investment approval: who actually owns the investment, who monitors the original assumptions, and why M&A and large CAPEX decisions are often easier to approve than to hold accountable.

Dai Kadomae, CFA, CPA
URL: www.garyofinance.com/en
Dai Kadomae, CFA, CPA | LinkedIn