Reverse DCF: what growth is the price already assuming?

A standard discounted cash flow (DCF) model starts with forecasts and ends with a value. A reverse DCF flips the order: it starts with the price the market is paying and asks what the forecasts would have to be to justify it. That turns a price into a set of expectations you can then judge for yourself, which is often easier than defending a single forecast.

The idea

In a forward DCF you choose growth, margins, a discount rate and a terminal value, and the model returns a value. The weakness is that the answer depends heavily on inputs you picked. In a reverse DCF you fix the observed price and the inputs you are most comfortable with, then solve for one unknown. The unknown is usually the growth rate of free cash flow over the forecast period, but it can also be the operating margin, the number of years of above-average growth, or the discount rate (the return you would earn if the other assumptions held).

The setup, using enterprise value and unlevered free cash flow:

FCF_t = FCF_0 x (1 + g)^t                      for t = 1..N
Terminal value = FCF_N x (1 + g_T) / (r - g_T)

Enterprise value = sum of FCF_t / (1 + r)^t  +  Terminal value / (1 + r)^N

Forward DCF:  choose g, solve for value
Reverse DCF:  set value = market enterprise value, solve for g

There is no tidy formula for g, so it is found by trial and error or with a spreadsheet's goal-seek tool. Market enterprise value is market capitalization plus debt minus cash. If you prefer to work with the share price directly, use free cash flow to equity and market capitalization instead, and keep the two sides consistent. See discounted cash flow basics for the building blocks.

Example (illustrative numbers)

A company has an enterprise value of $1,000 million and unlevered free cash flow of $50 million, so the market pays 20 times free cash flow. Assume a 9% discount rate, 3% terminal growth, and a ten-year forecast with one constant growth rate. Solving for the growth rate that makes the DCF equal $1,000 million gives about 5.0% a year. Ten years of 5% growth takes free cash flow from $50 million to about $81 million.

Changing the price changes the story:

At $2,000 million the market is pricing in free cash flow rising from $50 million to roughly $185 million within ten years. Zero growth in the same model would be worth only about $683 million. The question is not whether 14% is impossible, but how often companies of this kind have actually delivered it.

How to read the result

Compare the implied growth with evidence you can check:

• The company's own record. Has it grown free cash flow near that rate over the past five to ten years, and was the growth organic?
• Its market. Implied growth far above the growth of the industry means the company must take share or expand into new markets.
• The economy. A rule of thumb is that terminal growth should not exceed the long-run growth of the economy, and growth over the forecast period tends to fade as companies get larger and competitors respond.
• Reinvestment. Faster growth usually needs more capital. A return on invested capital far above anything the company has earned before is a warning sign about the assumed growth.

As rules of thumb: an implied rate close to or below the track record suggests modest expectations, while an implied rate well above anything achieved so far suggests the price leaves little room for disappointment. Neither tells you what will happen.

Common mistakes and limits

• Starting from an unrepresentative cash flow. If current free cash flow is at a cyclical peak or trough, every implied number is distorted. See free cash flow and the article on cyclical stocks and normalized earnings.
• Forgetting the terminal value. In a ten-year model the terminal value often accounts for most of the total, so the implied growth is very sensitive to the terminal assumptions. Read terminal value explained.
• Treating the discount rate as a fact. It is an estimate, and a one-point change moves the implied growth noticeably. See discount rate and CAPM.
• Using one constant growth rate. Real growth fades. A two-stage version, with faster growth first and slower growth later, is often more realistic.
• Mistaking it for a forecast. A reverse DCF tells you what is priced in, not what will happen. A demanding expectation can still be met, and a modest one can be missed.
• Ignoring dilution. Stock-based compensation and new share issuance reduce what existing shareholders receive from the same cash flows.

Where to see it on StocksXray

StocksXray's fair value runs in the forward direction: an equal-weight blend of three models, one of which is a 10-year DCF. When a stock is labeled Undervalued or Overvalued, the reverse DCF question is a useful follow-up: what would have to be true for today's price to make sense? Because model error is large, treat the answer as a range, as explained in why fair value is a range.

Key takeaways

• A reverse DCF takes the market price as given and solves for the growth, margin or return it implies.
• It is most useful as a reality check: compare the implied growth with the company's record, its industry and the wider economy.
• The result depends on the starting cash flow, the discount rate and the terminal value, so test several versions.
• It shows what is priced in, not what will happen, and it pairs naturally with a margin of safety.