Professional Diploma: Finance Business Partner

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Decision support

Building a business case

A finance business partner is the guardian of business-case quality across the organisation. A strong business case has a predictable structure, and when a case stalls or makes a bad decision, it is almost always because one part of that structure was missing or weak.

The skeleton of a good case

Every solid business case states six things. The decision being asked for. The realistic options, always including the option to do nothing. The incremental costs and benefits of each option (using only relevant costs from the previous lesson). The financials: payback for a quick gut check, and net present value (NPV) for the real answer. The key risks and how they will be managed. And a clear recommendation. Leave out any of these and the case will struggle to win approval.

Use NPV as the real test

Payback (how long to recover the cash) is a useful quick filter, but it ignores the time value of money and everything after payback. NPV, which discounts all future cash flows to today and subtracts the cost, is the proper test: a positive NPV means the option creates value after accounting for risk and the time value of money. Always show the NPV, and always show a sensitivity on the one or two assumptions that drive it.

Always include "do nothing"

The most commonly omitted option is doing nothing, yet it is essential, because every option must be judged against the realistic alternative, not against a blank slate. "Do nothing" is rarely truly free: equipment keeps ageing, problems keep growing, opportunities are missed. Quantifying the cost of inaction often makes the case for action far stronger.

Worked example. "Option A, buy a new system: minus 300,000 today, then plus 120,000 per year for five years; at a ten percent discount rate the NPV is plus 155,000, with a payback of 2.7 years. Option B, do nothing: maintenance costs on the old system rise, giving an NPV of minus 80,000 over the same period. Recommendation: choose Option A; the main risk is staff adoption, which we will mitigate with training and a phased rollout." In a few lines this gives the decision, the options including do-nothing, the financials, the risk and its mitigation, and a clear recommendation. It is decision-ready.

Common mistake

Hiding the risks to make the case look stronger. Counter-intuitively, stating risks honestly builds confidence, because it shows you have thought the decision through. A case with no risks looks naive, not safe.

A complete case has decision, options, costs and benefits, financials, risks, and a recommendation.
Use NPV as the real test; positive NPV means value is created.
Always include and quantify the "do nothing" option.
State risks honestly; it builds trust rather than doubt.

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