What is a reverse DCF?
A standard discounted cash flow model takes your forecast and produces a value. A reverse DCF takes the market's value, today's enterprise value, and produces the forecast. It answers one question: what growth rate, sustained for how long, makes today's price a fair price?
The approach was popularized by Alfred Rappaport and Michael Mauboussin in their book Expectations Investing. Their argument is that, rather than build a forecast from a blank page, investors should read the expectations embedded in the price and judge whether those expectations are more likely to be revised up or down. The price is the one input you know precisely, so it makes sense to start there.
The output is usually expressed as an implied growth rate in free cash flow, or sometimes revenue, over a forecast period of five or ten years. Some versions hold growth fixed and solve instead for how many years it must last, a figure sometimes called the market-implied competitive advantage period.
Why start from the price instead of a forecast
- It removes the anchoring problem. In a forward DCF it is tempting to nudge growth and discount rates until the value looks sensible. In a reverse DCF the price is fixed, so there is nothing to steer toward.
- It turns "expensive" into a testable claim. "The stock trades at 40 times earnings" is hard to judge. "The price assumes 15% annual cash flow growth for ten years" can be checked against the company's record, its industry and its competitors.
- It focuses research. If the implied growth is modest, the key question is whether the business is shrinking. If it is demanding, the key question is what could sustain that growth for so long.
- It separates the business from the stock. An excellent company can still be a poor investment when its price already assumes everything goes right.
The reverse DCF formula and its inputs
Start from the same equation as any DCF, but put the market's number on the left:
Enterprise value = market cap + debt − cash = Σ FCF₀(1 + g)ᵗ / (1 + r)ᵗ + TV / (1 + r)ⁿ
Terminal value: TV = FCFₙ × (1 + g∞) / (r − g∞)
Everything is known or assumed except g, the annual growth rate during the forecast period. That is what you solve for.
- FCF₀: current unlevered free cash flow, normalized for one-off items. Subtract stock-based compensation if it is material, since it is a real cost to owners.
- r: the discount rate, usually the weighted average cost of capital (WACC).
- n: the length of the forecast period, typically five or ten years.
- g∞: perpetual growth after year n, commonly 2% to 3% and always below r.
- Net debt and diluted shares: to convert between the share price and enterprise value.
There is no algebraic shortcut, so the answer is found by trial and error: try a growth rate, compute the value, adjust, repeat. A spreadsheet's goal-seek function or a reverse DCF calculator does the search in a fraction of a second.
Worked example: finding the implied growth rate (illustrative)
These figures are hypothetical and rounded; they describe no real company.
A company's shares trade at $50 and it has 100 million diluted shares, so its market capitalization is $5,000 million. Net debt is $500 million, giving an enterprise value of $5,500 million. Last year's free cash flow was $200 million. Use a 9% discount rate, a ten-year forecast period and 2.5% perpetual growth. Now test growth rates to see which one reproduces the price:
| FCF growth, years 1–10 | Enterprise value ($m) | Value per share | Versus the $50 price |
|---|---|---|---|
| 4% | 3,531 | $30.31 | Well below |
| 6% | 4,107 | $36.07 | Below |
| 8% | 4,778 | $42.78 | Below |
| 10% | 5,559 | $50.59 | Slightly above |
| 12% | 6,467 | $59.67 | Above |
Solving precisely gives an implied growth rate of about 9.9% a year. In plain terms, the $50 price assumes free cash flow rises from $200 million to roughly $510 million over ten years and then grows at 2.5% forever. Even with a ten-year forecast, about 62% of the value still comes from the terminal value.
Is 9.9% reasonable? It depends on the business. If free cash flow has compounded at 12% for a decade, reinvestment opportunities remain large and margins are stable, the bar looks achievable. If it has grown at 4% and the industry is maturing, the price is asking for a sharp and lasting acceleration.
How the assumptions move the implied growth rate
The implied growth rate is only as solid as the inputs held fixed. Changing one assumption at a time in the example above:
| Assumption changed | Implied growth rate (base case 9.9%) |
|---|---|
| Discount rate 8% instead of 9% | 7.5% |
| Discount rate 10% instead of 9% | 12.0% |
| Terminal growth 2% instead of 2.5% | 10.5% |
| Terminal growth 3% instead of 2.5% | 9.2% |
| Five-year forecast instead of ten | 15.9% |
| Fifteen-year forecast instead of ten | 7.9% |
| Share price $40 instead of $50 | 7.2% |
| Share price $60 instead of $50 | 12.1% |
Three things stand out. The discount rate matters most: one percentage point shifts the answer by more than two points. A shorter forecast period demands faster growth, because the high-growth phase has less time to build cash flow. And a 20% move in the share price shifts the implied growth rate by two to three points. Report the implied rate as a range across reasonable assumptions, not as a single figure.
Judging what is priced into a stock
An implied growth rate means little in isolation. Compare it with evidence:
- The company's own history. Look at revenue and free cash flow growth over five and ten years, and at whether growth has been accelerating or fading.
- Revenue versus margins. Cash flow can grow through higher sales, wider margins or lower reinvestment. A 10% cash flow growth rate might come from 7% sales growth plus modest margin expansion. Split the implied rate so you know which lever the price depends on.
- The industry and the company's size. Growth tends to slow as a company gets larger and its market matures. A rate that was ordinary at a tenth of today's size may be hard to repeat.
- Analyst forecasts. Consensus estimates usually cover only the next few years, but they show whether near-term expectations sit above or below the implied path.
On VALYSTR, The Bar translates a price into the revenue, earnings and margin hurdles it requires, and the expectations tab on a company page, for example /company/AAPL?tab=expectations, applies the same idea to a real company. For the forward side of the calculation, see how to value a stock.
Limitations and common mistakes
- An unrepresentative starting year. The whole path compounds from FCF₀. A year inflated by a working-capital release, or depressed by a one-off investment, distorts the answer. Use a normalized figure or an average of several years.
- Cyclical peaks. Starting from peak-cycle cash flow makes the implied growth look undemanding just before cash flow falls. Use mid-cycle margins for cyclical companies.
- Negative or tiny free cash flow. If FCF₀ is zero or negative, no growth rate works. Solve instead for the revenue growth needed to reach an assumed mature margin.
- Banks and insurers. Their free cash flow is not meaningful because debt is raw material rather than financing. A residual-income model built on book value and return on equity fits them better.
- Dilution and acquisitions. Heavy stock-based pay, or growth bought through acquisitions, means company-level cash flow growth overstates what accrues to each share.
- Reading the result as a signal. Low implied growth means expectations are modest, not that the stock will rise. Declining businesses often carry low implied growth for good reason.
Putting a reverse DCF to work
A practical routine for any company you follow:
- Run the reverse DCF at your base-case discount rate, then one point higher and one point lower.
- Compare the implied growth with the company's history and with consensus. VALYSTR's Belief Gap sets the growth the price implies against what forecasts expect, which is this comparison made for you.
- Decide which lever, sales growth or margins, the price depends on most, and record it as a condition your thesis needs. The investment thesis guide explains how, and Thesis Guardian monitors such conditions.
- Re-run it after each earnings report, when both the price and the cash flow change. The earnings analysis guide covers what to read in a report, and Reaction Map shows how a stock has reacted to past results.
Done this way, the reverse DCF becomes a running record of what the market expects and how the company is tracking against it.
Try it
What growth is priced in?
Enter a stock’s P/E and your assumptions. The calculator solves for the yearly earnings growth the price already requires.
Earnings growth the price implies
14.7% a year
For 10 years, if investors pay 18× earnings at the end and you require 9% a year.
Simplified: ignores dividends, buybacks and changes in share count. For a full reverse valuation with a company’s own numbers, use Belief Gap.
Articles in this guide
See the growth a price implies
Belief Gap compares the growth a company's current price implies with what forecasts expect, so you can see where the bar sits.
Frequently asked questions
What does a reverse DCF tell you?
A reverse DCF tells you the growth rate the current share price implies, given a discount rate and terminal assumptions. It does not tell you what the stock is worth. It gives you a concrete expectation to test against the company's history, its industry and analyst forecasts, so you can judge whether the market looks too optimistic or too pessimistic.
How is a reverse DCF different from a regular DCF?
A regular DCF starts with your forecast of free cash flow and produces an estimated value per share. A reverse DCF starts with the market price and works backwards to the forecast that would justify it. The equation is the same; only the unknown changes, from the value to the growth rate.
What is a good implied growth rate?
There is no universally good number. An implied growth rate is attractive only relative to what the business can realistically deliver. Ten percent a year could be comfortable for a young company gaining share in an expanding market and very demanding for a mature one. Compare it with the company's record, its industry and consensus forecasts.
Can you do a reverse DCF when free cash flow is negative?
Not in its simple form, because no growth rate applied to a negative starting cash flow produces a positive value. Instead, assume a mature operating margin and solve for the revenue growth the price requires to reach it, or build a longer forecast that models the transition to positive free cash flow.
What discount rate should I use for a reverse DCF?
Use the same rate you would use in a forward DCF, usually the weighted average cost of capital for firm-level cash flow. Because the implied growth rate is very sensitive to this choice, run the model at several rates and report the range of answers rather than a single figure.