Discounted Cash Flow
Also: DCF, Discounted Cash Flow Analysis, DCF Valuation
Discounted Cash Flow (DCF) is a valuation method that estimates an asset's value by projecting future cash flows and discounting them to present value using a required rate of return.
What It Is
Discounted Cash Flow (DCF) is a valuation technique that estimates the value of an investment based on its expected future cash flows. The core idea rests on the time value of money: a dollar received today is worth more than a dollar received in the future, because today's dollar can be invested to earn a return. DCF converts future cash flows into their present value by applying a discount rate.
Why it matters
DCF is one of the most widely used methods in corporate finance, investment analysis, and capital budgeting. Unlike market-based methods (such as comparable company multiples), DCF is grounded in the fundamentals of the asset itself: how much cash it is expected to generate. This makes it useful for:
- Valuing companies, projects, or individual assets
- Deciding whether to pursue capital investments
- Supporting mergers and acquisitions decisions
- Stress-testing assumptions through scenario analysis
How it works
The general formula sums the present value of each future cash flow:
PV = CF1 / (1+r) + CF2 / (1+r)^2 + ... + CFn / (1+r)^n
Where:
- CF is the cash flow in each period
- r is the discount rate (often the Weighted Average Cost of Capital, or WACC)
- n is the number of periods
Because businesses are assumed to operate indefinitely, analysts usually add a terminal value to capture cash flows beyond the explicit forecast horizon, commonly using a perpetuity growth model or an exit multiple.
Concrete Example
Suppose a project is expected to generate 100,000 per year for 3 years, with a discount rate of 10%.
- Year 1: 100,000 / 1.10 = 90,909
- Year 2: 100,000 / 1.21 = 82,645
- Year 3: 100,000 / 1.331 = 75,131
Total present value = 248,685. If the upfront cost of the project is 230,000, the Net Present Value (NPV) is positive (about 18,685), suggesting the project creates value.
Practical Cautions
DCF outputs are highly sensitive to inputs. Small changes in the discount rate or growth assumptions can swing the valuation dramatically. Practitioners should test ranges, document assumptions, and avoid treating a single number as precise truth.
See also
Frequently asked questions
What is discounted cash flow used for in practice?
Discounted cash flow (DCF) estimates what an investment is worth today based on the cash it is expected to generate in the future. It is used to value companies, projects and individual assets, to decide whether a capital investment is worth making, to support M&A decisions, and to stress-test assumptions through scenario analysis. Unlike market comparables, it anchors the valuation in the fundamentals of the asset itself.
What is the difference between DCF and valuation by comparable multiples?
DCF values an asset from the inside: you project its own future cash flows and discount them to present value. Comparable multiples value it from the outside, by applying ratios observed on similar companies or transactions. DCF is more sensitive to your assumptions, market multiples are more sensitive to market mood; analysts usually run both and compare the results.
How is a DCF actually calculated?
You sum the present value of each future cash flow: PV = CF1/(1+r) + CF2/(1+r)² + … + CFn/(1+r)ⁿ, where CF is the cash flow of the period, r the discount rate and n the number of periods. The discount rate is often the Weighted Average Cost of Capital (WACC). A terminal value is usually added to capture cash flows beyond the explicit forecast horizon, via a perpetuity growth model or an exit multiple.
What does a positive net present value tell you?
A positive net present value (NPV) means the discounted future cash flows exceed the upfront cost, so the project is expected to create value. Example: a project generating 100,000 per year for three years at a 10% discount rate has a present value of 248,685 (90,909 + 82,645 + 75,131). If it costs 230,000 to launch, the NPV is about 18,685 and the project clears the bar.
Why do two analysts get very different DCF values for the same company?
Because DCF results are extremely sensitive to inputs: a small change in the discount rate or the long-term growth assumption can move the valuation dramatically, and terminal value often represents the bulk of the total. The practical answer is to work with ranges rather than a single figure, document every assumption, and treat the output as a decision aid rather than a precise truth.