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The Global Insight

How do we evaluate the cash flows of projects?

Author

John Hall

Updated on February 20, 2026

Perhaps the most widely-used technique for analyzing a potential investment opportunity, or project, is the net present value of cash flow or NPV approach. In this technique, the cash flows derived in a business case are discounted at the opportunity cost of capital.

What is annual cash inflow?

Cash inflow is the money going into a business. That could be from sales, investments or financing. It’s the opposite of cash outflow, which is the money leaving the business.

Which is the first step in estimating cash flows?

The first is to find the cash flows, the second is to find the appropriate discount rate that represents the time value and riskiness of those cash flows and the third step is to use both these inputs and discount the cash flows at the chosen rate. However, in practice it is not that straightforward.

Why are there so many complications in estimating project cash flows?

There are many complications that arise during the process. Complications usually arise because neither of the variables that we are using in the projection is certain. We are therefore, at best choosing estimates. Deciding whether we have the right estimates is very important. A slight change could bring about a completely different valuation.

Why do you have to subtract project from cash flows?

So, while calculating the cash inflows from the new model, we must subtract $12,000 from it. This is because without the project the company has the $12,000 but with the project, the company stands to lose $12,000. It may make additional money but $12,000 is an incidental cost that is being paid to undertake this project.

Why do you subtract sale of old model from cash flows?

They will cause the sale of the old model to drop by $12,000. So, while calculating the cash inflows from the new model, we must subtract $12,000 from it. This is because without the project the company has the $12,000 but with the project, the company stands to lose $12,000.