Why Project DCF Cash Flows Exclude Financing Costs
Summary
The note explains why project cash flows in a discounted cash flow analysis are generally evaluated without separately subtracting loan interest or principal payments. The answer distinguishes operating cash flows from the financing arrangement: if a stated net cash flow already reflects project revenues and expenses, it may also reflect interest paid under a particular borrowing plan. Discounting that amount at a required return is a valuation method, not a second line-item adjustment for debt service.
The discount rate is not simply the project’s borrowing rate. It can reflect risk, including the chance of failure and uncertainty in future cash flows, and may represent a required return above a risk-free rate. For a fully risk-free project, the answer says the appropriate rate should align with a risk-free investment return, which may be lower than the cost of borrowing. The example motivates the confusion but does not establish a universal rate or cash-flow convention; the result depends on defining cash flows and discount rates consistently.
Key ideas
- Project DCF discounts the relevant cash flows at a single rate rather than separately discounting loan payments and revenues.
- Net project cash flows may already reflect interest under a particular financing arrangement.
- A discount rate can reflect project risk as well as the time value of money.
- For a risk-free project, the discount rate should correspond to a risk-free investment return.
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Full text
# Why are finance costs excluded in capital budgeting? # Why are finance costs excluded in capital budgeting? I am having trouble understanding why finance costs are excluded while calculating cash flows of a project. My teacher says that the discounting at the required rate already incorporates the effect of finance costs so it would result in double counting. This is what I have trouble understanding: Say the value of investment (Initial cash outflow) = 1,000,000 The finance cost (i.e, the interest rate) = 10% Finance cost per year = 100,000 Assuming equal cash flows of 250000 per annum for 5 years, The present value of the 1st year cash flow = 227,250 (250,000 * 0.909) Which considers a finance cost of only 22,750 and not 90,900(100,000 * 0.909) ## Answer by D Stanley (score 1) https://quant.stackexchange.com/a/76545 22,750 is not the "finance cost". If your "annual cash flow" of 250k is net, meaning it includes the revenues and expenses of the project, then it includes the 100k of "interest" you would pay if you borrowed the money at 10% (meaning that the gross revenue is 350k). It might also include cash flow to pay down the loan, depending on how the loan was structured. But from a DCF point a view, you discount the total net cash flow at each period using a single discount rate (you don't discount loan payments differently that revenues, for example). Your teacher is not confusing you with those details, just giving you the total net cash flow, which implicitly includes loan interest (if any). But don't assume that "discount rate" is completely analogous to "finance cost". There are many other factors that go into the discount rate, including the risk of the project (e.g. what's the probability of the project failing, or what's the potential range of cash flows) that go into the discount rate. Other types of analysis use "required rate of return" for the discount rate, which would be higher than a risk-free interest rate. If the project were completely risk-free, then the discount rate should be equal to the interest rate you'd get from putting the money in a savings account or other risk-free investment (e.g. money market funds or CD), which would be a lower rate than what you could borrow the money for.
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