A reverse DCF turns a standard discounted cash flow model on its head: instead of forecasting growth and a discount rate to produce a value, it takes a price as given and solves for the growth rate that price requires. The output is not a verdict on a company; it is a restatement of a price as an assumption.
The idea in plain words
Every ordinary discounted cash flow model does the same three things: it takes a company's current cash flow, assumes how fast that cash flow will grow, and discounts the resulting stream back to a value per share using a chosen discount rate. Change the growth assumption and the value per share changes with it.
A reverse DCF runs that logic in the opposite direction. Rather than choosing a growth rate and calculating a value, it fixes the value, usually a traded price, and asks what growth rate, held constant for everything else, would have to be true for the discounted cash flows to add up to that number. The answer is not a prediction. It is an accounting of what the price already assumes.
DCF vs reverse DCF
The mechanics are identical; only the known and unknown variables swap places. A standard DCF has free cash flow, a discount rate and a growth path as inputs, and a value per share as the output. A reverse DCF has free cash flow, a discount rate and a value per share, the price, as inputs, and the growth path as the output.
Two investors can agree on every other input to a model, free cash flow, the discount rate, the terminal growth rate, and still disagree about a price, simply because they hold different views of how fast cash flow will grow in the years ahead. A reverse DCF isolates that one disagreement and puts a number on it.
How it is worked out, step by step
The calculation follows a short sequence.
First, establish the company's current free cash flow, the starting point the model will grow forward. Second, fix a discount rate, representing the return a buyer of the whole business would require. Third, decide how many years of explicit, stage-one growth the model allows before growth fades towards a long-run terminal rate; most two-stage models run the explicit stage for several years and then apply a Gordon-growth formula. Fourth, set the target value: in an ordinary DCF this is produced by the model, while in a reverse DCF it is supplied, typically as the current price. Fifth, solve for the single unknown, the stage-one growth rate, that makes the discounted sum of projected cash flows equal the target value.
Every other input, free cash flow, the discount rate, the terminal growth rate, is held fixed while the model searches for that one number. Change any of the fixed inputs and the implied growth rate changes too, which is the first limit of the exercise.
A worked case using Adobe's filed figures
Adobe Inc. reported trailing twelve-month free cash flow of $10.6 billion, with that free cash flow equal to 40.8% of trailing revenue. Revenue itself grew 12.0% over the same trailing period, and net margin stood at 28.0% of revenue.
In our own model, the base case takes that 12.0% trailing growth rate as the starting assumption for the explicit growth stage, rather than inventing a separate forecast. A reverse DCF applied to any price for Adobe would, by construction, produce a growth number that can be compared with that 12.0% trailing figure: a reverse-implied growth rate above 12.0% would mean a price assumes faster growth than Adobe has actually delivered, and a rate below it would mean the opposite. We do not publish that comparison for a specific price here, because this article is about the method, not a reading of any particular quote.
What it means for value
Adobe's own trailing growth rate of 12.0% is the number our model's base case uses as its stage-one growth assumption. Moving that single assumption five percentage points lower would reduce our model's value per share by 24.4%; moving it five percentage points higher would raise it by 31.6%. Lifting the discount rate by one percentage point on its own would reduce model value by 15.3%.
Margin assumptions move the same model by less. Each percentage point of lower free-cash-flow margin reduces model value by 2.4%, and Adobe's free-cash-flow margin's own year-over-year move, −0.6pp, would cut model value by 1.5% if that smaller margin persisted. Growth assumptions carry more weight in this model than margin assumptions: a 24.4% swing from a five point growth change set against a 2.4% swing from a one point margin change. That is the practical use of a reverse DCF: it shows which assumption a price depends on most, without asserting that the assumption is correct. These are model values under stated assumptions, not a comparison with the share price.
Common mistakes and limits
A reverse DCF cannot say whether an implied growth rate is achievable; it only computes what growth rate a price requires, given the other assumptions held fixed. Three mistakes recur.
The first is treating the discount rate and terminal growth rate as facts rather than choices; both are fixed by the person running the model, and a different discount rate produces a different implied growth rate from the same price. The second is forgetting that the current margin is also an assumption, not a certainty: Adobe's free-cash-flow margin of 40.8% currently sits at the 75th percentile of its own trailing history, so a model that simply holds today's margin flat into the future is assuming a level that has not been typical across that history. The third is mistaking the solved-for growth rate for a forecast; it describes what a price already contains, not what will happen next.
A reverse DCF also cannot separate a market's view of growth from its view of margin, or its view of risk, when more than one of those is mispriced at once. It solves for a single chosen unknown, holding everything else fixed, which is a simplification readers should keep in mind before drawing conclusions from the result.
Where to see it on Fundamentalytics
Fundamentalytics runs a live version of this calculation for covered companies at /priced-in/, which resolves the growth assumption embedded in a current price rather than asking a reader to build the spreadsheet. The underlying method, including how free cash flow, the discount rate and the terminal growth rate are defined, is set out at /valuation-methodology/.
