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.