Advanced · Intrinsic Valuation

Discounted Cash Flow (DCF)

A DCF model forces the most important question in investing: what is this stream of future cash flows worth in today's money? Done well, it is a framework for disciplined thinking. Done carelessly, it is a machine for producing plausible-looking numbers that are deeply wrong. Understanding the difference is what separates analysts from modellers.

Level:Advanced
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Read time:12 min
Core equation
PV = CF ÷ (r − g)
Perpetuity form
Terminal value
~70–80%
Share of total value
1% change in WACC
±15–25%
Typical IV swing
Best output
A range
Not a single number
Foundation

What is a DCF model?

DCF stands for Discounted Cash Flow. It is a valuation framework that estimates the intrinsic value of a business by forecasting its future cash flows and discounting them back to the present at a rate that reflects both the time value of money and the risk of those cash flows.

The underlying logic is: a euro received in the future is worth less than a euro received today. The gap depends on how long you wait and how uncertain you are that you will receive it at all. DCF formalizes this intuition into a mathematical framework.

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Key takeaway
DCF is not a precision instrument. It is a disciplined way to connect business quality, growth assumptions, reinvestment needs, and risk into an estimate of intrinsic value. Treat the output as a range of plausible values, not as a target price.
Investor mindset

Why serious investors use DCF

Multiples-based valuation (P/E, EV/EBITDA) anchors on what the market is currently pricing. DCF anchors on what the underlying business is intrinsically worth based on its economics. The gap between these two things is where investment opportunity (or risk) lies.

Forces explicit assumptions

To run a DCF, you must state your growth, margin, reinvestment, and risk assumptions explicitly. This forces intellectual clarity that relative valuation shortcuts skip over.

Captures long-duration value

Multiples are inherently short-term focused. A DCF can capture the full value of a business with a 30-year competitive advantage — something a P/E ratio simply cannot do.

Reveals what's priced in

Working backwards from the current market price, you can calculate the implicit assumptions the market is making. Do those assumptions look optimistic or conservative?

Quantifies margin of safety

The gap between your DCF estimate and the current price is your margin of safety. A wide gap compensates for modelling errors; a narrow gap leaves no room for mistakes.
Mechanics

The DCF formula

Core present value formula
Intrinsic Value = Σ [FCFt ÷ (1 + r)^t] + Terminal Value ÷ (1 + r)^n
Sum the PV of each year's projected FCF plus the discounted terminal value.
Gordon Growth Model (terminal value)
TV = FCF(n+1) ÷ (WACC − g)
FCF(n+1) = next year FCF at end of explicit period. g = perpetual growth rate.
Exit multiple method (terminal value)
TV = EBITDA(n) × Exit Multiple
Often used as a cross-check. Anchors on market multiples rather than perpetuity math.
◆Analyst note
The two terminal value methods should broadly agree. If they diverge materially, check your assumptions — the Gordon Growth rate may be too aggressive, or the exit multiple may not be comparable to the business's likely future profile.
Inputs

The five building blocks of a DCF

01
Base cash flow
Start from trailing FCF or NOPAT. Normalize for non-recurring items. This is your anchor. Optimistic starting FCF compounds into dramatically wrong outputs.
02
Revenue and margin assumptions
Forecast top-line growth from competitive analysis, market structure, and historical trends. Then model operating margins — do they expand, contract, or hold? Each 1% margin change can move intrinsic value by 5–15%.
03
Reinvestment rate
How much of NOPAT must be reinvested to support growth? Reinvestment = CapEx + ΔWorking Capital − D&A. High-growth businesses reinvest heavily. Mature businesses have low reinvestment needs and high FCF conversion.
04
Discount rate (WACC)
Reflects the required return given the riskiness of the business. The most sensitive assumption in most DCFs. A 1% change in WACC can move IV by 15–25% for long-duration businesses.
05
Terminal growth rate
The perpetual growth rate beyond the explicit forecast period. Must be at or below long-run nominal GDP growth (typically 2–3%). Anything higher implies the business eventually becomes larger than the global economy.
Risk

The discount rate — WACC demystified

WACC — Weighted Average Cost of Capital
WACC = (E/V × Ke) + (D/V × Kd × (1 − tax rate))
E = equity value, D = debt value, V = E + D, Ke = cost of equity, Kd = cost of debt.
CAPM — Cost of Equity
Ke = Rf + β × (Rm − Rf)
Rf = risk-free rate, β = beta (market sensitivity), (Rm − Rf) = equity risk premium (~4–6%).
WACC is an estimate, not a fact
Beta is backward-looking and noisy. The equity risk premium is debated by academics. The risk-free rate changes constantly. Many practitioners use a simplified required return (8–12%) based on judgment rather than CAPM, arguing that CAPM precision is false precision. Honesty about uncertainty is more valuable than spurious accuracy.
The discount rate and business quality
Higher-quality businesses (predictable cash flows, low cyclicality, strong competitive position) justify lower discount rates. A utility or consumer staples company with highly predictable cash flows might reasonably use 8%. A small-cap cyclical business with volatile margins and significant debt might require 13–15%.
Long-duration value

Terminal value — the most important (and dangerous) number

For a well-run business valued at a 9% discount rate with 3% terminal growth, the terminal value often represents 70–80% of total DCF output. This means your forecast of years 1–5 matters far less than your terminal assumptions.

The terminal growth trap
Using a 4% or 5% terminal growth rate might not seem aggressive. But it implies the business grows faster than the economy forever. These assumptions compound into enormous terminal values that dwarf any reasonable DCF. As a discipline, keep terminal growth at or below 2.5–3% for most businesses. Use 0–1% for mature or declining businesses.
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Worked example
How terminal growth assumption moves IV — dramatically

Same business, same FCF, same WACC (9%). Only the terminal growth rate changes:

Terminal growth = 1%IV ≈ $52/share
Terminal growth = 2%IV ≈ $65/share
Terminal growth = 3%IV ≈ $85/share
Terminal growth = 4%IV ≈ $118/share
Terminal growth = 5%IV ≈ $195/share

A 2-point change in terminal growth produced a 3.7× difference in intrinsic value. This is why terminal assumptions require the most scrutiny of any DCF input.

Scenario analysis

Sensitivity analysis — why you need a range

A single DCF output is a false precision. Professional analysts build sensitivity tables to show how intrinsic value changes across a range of discount rate and growth assumptions. This immediately reveals which assumptions drive most of the value — and which estimates are most uncertain.

Discount Rate ↓ / Growth →g=3%g=5%g=7%g=9%g=11%
WACC=7%$33$66$13222$-66$-33
WACC=8%$30$50$151$-151$-50
WACC=9%$28$43$85$17000$-85
WACC=10%$27$38$63$189$-189
WACC=11%$26$35$52$104$20778
WACC=12%$25$32$45$76$227
Illustrative sensitivity only. Blue cell = base case assumption. Small changes in terminal growth or discount rate produce very large valuation swings.
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Key takeaway
Present your DCF as a range: bear, base, and bull scenarios. If the current price is well below even the bear case, you may have a compelling margin of safety. If the price requires the bull case to be justified, the market is pricing in a lot of optimism.
Application

A simplified worked example

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Worked example
Five-year DCF for a simple business

Assumptions:

Year 0 FCF$100M
FCF growth (years 1–5)8% per year
Discount rate (WACC)9%
Terminal growth rate3%
Shares outstanding50M

Step 1 — Project and discount explicit FCF:

Y1: FCF $108M → PV $99.1M
Y2: FCF $116.6M → PV $98.2M
Y3: FCF $125.9M → PV $97.2M
Y4: FCF $136M → PV $96.3M
Y5: FCF $146.9M → PV $95.5M
Sum of PV (Y1–Y5): $486.3M

Step 2 — Terminal value:

Y6 FCF = $146.9M × 1.03 = $151.3M
TV = $151.3M ÷ (0.09 − 0.03) = $2,521.7M
PV of TV = $2,521.7M ÷ (1.09^5) = $1,638.4M

Step 3 — Intrinsic value per share:

Total IV = $486.3M + $1,638.4M = $2,124.7M
IV per share = $2,124.7M ÷ 50M = $42.49

Note that the terminal value ($1,638M) represents 77% of total value — illustrating why terminal assumptions dominate the output.

Pitfalls

Common DCF mistakes to avoid

Hockey-stick revenue projections
Assuming moderate growth for 2 years then explosive growth thereafter is one of the most common biases. Revenue inflection points are extremely rare and almost impossible to time. Base projections on observable historical performance and industry structure.
Ignoring reinvestment needs
Revenue cannot grow without capital. If you project 12% revenue growth but model flat capex and working capital, your model is internally inconsistent. ROIC and reinvestment rate must be connected to growth — they are two sides of the same equation.
Using EBITDA as a cash flow proxy
EBITDA ignores capex, working capital changes, and taxes. For capital-intensive businesses, EBITDA can dramatically overstate available cash. Always use FCF or FCFF for DCF inputs, not EBITDA.
Mixing enterprise and equity value
A common error: discounting FCFF (firm cash flow) at WACC, then forgetting to subtract net debt to reach equity value. Or discounting FCFE (equity cash flow) at WACC rather than the cost of equity. Be consistent throughout.
Limitations

When DCF is less useful

Early-stage businesses

When a company has no profits and uncertain path to profitability, FCF forecasting is speculative. Scenario-based analysis or comparable transaction multiples may be more honest.

Deeply cyclical businesses

Point-in-time FCF is misleading for miners, energy producers, or chemicals companies. Normalize across a full cycle (5–10 years) or use mid-cycle assumptions explicitly.

Financial institutions

Banks and insurers have cash flows that are fundamentally different — debt is raw material, not just financing. DDM (dividend discount model) or ROTE-based approaches are more appropriate.

Holding companies

Sum-of-the-parts analysis is usually superior. Running a DCF on a conglomerate's blended cash flows obscures the divergent quality of individual businesses.
Questions

Frequently asked questions

DCF is the most conceptually rigorous approach because it forces explicit assumptions about growth, margins, and risk. But 'best' depends on the business. Stable, mature companies with predictable cash flows are ideal DCF candidates. Cyclical, early-stage, or structurally uncertain businesses are harder. Most professionals use DCF alongside relative valuation as a cross-check.
Next lesson ◆

Valuation Ratios

Learn how multiples like P/FCF and EV/EBITDA relate to DCF assumptions — and when to use each.
Continue
Educational disclaimer · This content is for educational and informational purposes only. It does not constitute investment advice, tax advice, legal advice, or a recommendation to buy or sell any security. Always conduct your own research before making investment decisions.