10.3 Investment appraisal

Investment appraisal evaluates whether a project’s expected benefits justify its cost and risk. It should consider cash flows, timing, capacity, strategy and alternatives.

Different methods simplify different aspects. The decision depends on assumptions about demand, costs, asset life, discount rate and the opportunity cost of funds.

A new machine may reduce unit cost but require training and downtime; its value depends on the incremental cash flow and strategic fit, not price alone.

A positive calculation does not remove implementation risk or guarantee the forecast.

Payback measures how long a project takes to recover its initial cash outlay. Accounting rate of return compares average accounting profit with an investment basis. Payback emphasises liquidity; ARR emphasises reported profitability.

Payback ignores cash flows after recovery and often ignores time value; ARR depends on accounting profit and depreciation assumptions. Use each only for the decision purpose it can support.

Project A may recover cash quickly but earn little later, while Project B may have a slower payback but stronger long-term returns.

A shorter payback is not automatically the most profitable project.

Net present value subtracts the initial investment from the present value of expected future cash inflows and outflows, using a discount rate that reflects time and risk.

Money received later is not equivalent to money received now. NPV recognises timing and can compare projects whose cash flows arrive at different times, provided assumptions are credible.

A project with a large cash inflow in year five may have a lower present value than its undiscounted total suggests; changing the discount rate can change the ranking.

NPV is only as reliable as the cash-flow and discount-rate assumptions, and a positive NPV is not a guarantee.

Choose an investment by combining appraisal results with strategic fit, risk, capacity, capability, stakeholder effects and the quality of evidence.

A project can score well financially yet conflict with regulation, skills or brand; another can have a lower immediate return but build essential capability.

A renewable-energy investment may have a longer payback but reduce exposure to volatile energy prices and support a strategic commitment.

There is no single metric that decides every investment; state assumptions and trade-offs explicitly.