Discounted cash flow (DCF) works out what a business is worth today by taking the cash it is expected to generate in future years and converting that cash back into present-day money. It is an inside-out valuation. The answer comes from the company’s own economics rather than from whatever the market happens to be paying for the shares this morning.
How DCF works and where it fits
The method takes expected future cash flows and discounts them to a present value. Money arriving in eight years is worth less than the same sum arriving next year, partly because capital has a cost and partly because the distant forecast is less likely to be right. The discount rate carries both of those adjustments.
DCF suits companies whose cash flows are predictable and reasonably stable. In practice it turns up in mergers and acquisitions, in appraisals of capital projects and in assessments of a company’s financial health. Long-term investors use it when they want a view of what a business is worth on its own numbers rather than on sentiment.
Risk enters the calculation through the discount rate. A riskier business is discounted at a higher rate, which pushes down the present value of everything it is expected to earn. That is how the model reflects the possibility that the forecast simply does not happen.
Why the method is so widely used
DCF produces a valuation built on future performance rather than on the current share price or on last year’s accounts. It lets an analyst see what the business would be worth if the projected cash actually arrives — and, just as usefully, what has to be true for today’s price to make sense.
The formula behind DCF:
The DCF formula
DCF = CF₁ / (1+r)¹ + CF₂ / (1+r)² + … + CFn / (1+r)ⁿ
- CF — the cash flow expected in a given period, usually a year
- r — the discount rate, meaning the required return or the cost of capital
- n — the number of periods over which the company generates cash
Doing the arithmetic: the formula looks heavier than it is, and nobody works through it by hand. Free online calculators handle the sums once you supply the projected cash flows, the discount rate and the horizon. The difficult part was never the maths — it is deciding what numbers to type in.
How a DCF analysis is put together
There are four steps, and each one rests on the result of the one before it.
1. Projecting the cash flows
Future cash is estimated from trading history and from assumptions about growth. The longer the horizon, the less reliable the figures become.
2. Setting the discount rate
Usually the weighted average cost of capital (WACC), which combines the cost of debt, the return shareholders expect and a risk premium.
3. Terminal value
What the business is worth once the forecast period ends. Calculated either as a perpetuity growing at a constant rate or as a multiple drawn from comparable companies.
4. Adding up the present values
The discounted cash flows and the terminal value are summed. The result is an estimate of the company's value, which is then set against the market price.
The free cash flow the model runs on
Accounting profit does not go into the formula. Free cash flow does — the money left over once the company has paid for running the business and for its investment.
FCF = EBIT × (1 − T) + depreciation − investment (CapEx) − change in working capital
- EBIT — operating profit before interest and tax
- T — the rate of corporation tax
- depreciation — a non-cash charge, so it is added back
- CapEx — spending on long-term assets
- working capital — cash tied up in stock and in money owed by customers
Where DCF works and where it breaks down
The method earns its place wherever future trading can be estimated with some confidence: established companies with steady cash flows, industries with predictable demand and businesses with a long record to look back on.
It struggles with loss-making companies, with erratic cash flows, with cyclical industries and with young firms where most of the value sits in the terminal value — a number that is itself only an estimate. The output is highly sensitive to what goes in. Moving the discount rate by a single percentage point can shift the valuation by tens of per cent. That is why a DCF is treated as one input among several rather than as an answer on its own.
Run the numbers yourself
You do not have to assemble the formula by hand. Enter the cash flows, the discount rate and the horizon in the DCF calculator and you will see the present value along with the year-by-year breakdown.
Using DCF when looking at shares
Applied to equities, DCF (discounted cash flow) gives an estimate of intrinsic value grounded in future cash rather than in the market’s current mood. It shows what the business would be worth if the projections hold, which is a different question from what the shares are trading at.
The model also invites you to change your mind on paper. Adjust the discount rate, soften the growth assumption, shorten the forecast period, and you can see how far the valuation moves. Running those scenarios often teaches more than the headline figure does, because it exposes which single assumption the whole valuation rests on.
Set against the market price, the result indicates whether a share looks expensive or cheap relative to the modelled value. Because DCF accounts for both the time value of money and risk, the estimate tends to be more grounded than a simple multiple, particularly where the future cash flows carry real uncertainty.
DCF analysis across sectors
The principles never change, but the way a DCF is built differs from one industry to the next. Each sector has features that shape the forecast period, the discount rate and the growth assumptions.
Technology
Technology companies often combine rapid growth with unsettled cash flows in their early years. Longer forecast periods of seven to ten years are common, along with higher discount rates to reflect the uncertainty. Terminal growth rates usually sit somewhere between 3% and 5%, and the model needs to allow for how quickly products date.
Utilities and energy
Utilities and energy companies sit at the opposite end, with very steady and largely predictable cash flows. Shorter forecast periods of five to seven years are typical, as are lower discount rates in the region of 6% to 8%, thanks to the regulated environment. Terminal growth of 1% to 2% is normal, roughly in line with long-run economic growth.
Financials
For banks and insurers the standard DCF model fits poorly. Analysts tend to use an adapted version built on a dividend discount model or on surplus capital instead. Regulatory capital requirements and the level of interest rates both have to be reflected in the figures.
Retail and consumer goods
In retail, seasonality and working capital deserve close attention. Forecasts often go down to store openings and like-for-like sales growth. Discount rates typically fall between 8% and 12%, with terminal growth around 2% to 3%.
Industrials
Industrial companies call for careful work on capital expenditure and its cyclical pattern, since investment tends to follow the economic cycle rather than a straight line. Discount rates usually run between 9% and 13%, with terminal growth of 2% to 3%.
Pharmaceuticals
Pharmaceutical valuations have to account for research spending, patent protection and the pipeline of products still in development. The forecast period can stretch beyond ten years because drug development takes that long. Discount rates are typically higher, in the 10% to 15% range, reflecting the chance that research leads nowhere.
Real estate
Property companies are often valued with a DCF alongside net asset value (NAV). Portfolio value, occupancy and rent levels all feed into the picture. Discount rates are usually lower, around 6% to 9%, because rental income is comparatively stable.
What a DCF has to cover
A DCF is a sophisticated valuation tool made up of several moving parts. Terminal value is the foundation — calculated either through a perpetuity growth model or an exit multiple — and it frequently accounts for the larger share of the total valuation. Free cash flow matters just as much, because it gives a truer picture of financial performance than reported profit does.
Accuracy depends heavily on getting the discount rate right, most often through WACC, which weighs the cost of equity against the cost of debt. Using the method properly means running a sensitivity analysis and being honest about the model’s limits. The inputs deserve the same care: projected cash flows have to reconcile historical results with what can reasonably be expected ahead.
Getting value out of a DCF means understanding how the calculation is built and how to read what comes out of it. In practice it is used alongside other valuation methods, each with its own strengths and blind spots. Combining approaches, examining the inputs closely and testing how far the answer moves when assumptions change is what makes the exercise worth doing.