Reverse DCF Turns a Stock Price Into a Growth Forecast

A forward DCF asks you to produce ten years of cash flow forecasts and then tells you whether the stock is cheap. Since you built the forecast and you already had an opinion about the stock, the answer tends to come out matching the opinion. I have done this to myself more times than I would like to write down.

The reverse version removes the room to do that. You take the current price as a given, hold the discount rate at a policy number you set in advance, and solve for the growth rate that makes the model produce exactly today's price. The output is not a fair value. It is a sentence: at this price, the market is paying for roughly this much growth for roughly this long. Then you decide whether that is plausible, which is a question you can actually answer.

Running the model backwards

The mechanics are simpler than the forward version because there is only one unknown.

Start with enterprise value rather than share price, because free cash flow belongs to the whole capital structure. Take market capitalisation, add total debt, subtract cash, all from the latest filing and a current quote. Then take trailing free cash flow, meaning cash from operations less capital expenditure, from the cash flow statement. Fix your discount rate and your terminal growth rate as policy, not as variables. Then solve for the explicit period growth rate that makes the discounted cash flows plus terminal value equal your enterprise value.

Solving is a search rather than a formula, and a spreadsheet does it in seconds. Set up the model with growth in a single cell, then adjust that cell until the model output matches enterprise value. Goal seek does it in one step, and doing it by hand three or four times is instructive the first time because you see how sensitive the answer is.

The one discipline that makes this work: the discount rate must be fixed before you start and must not move. If you let it float you are no longer solving for expectations, you are solving for two unknowns with one equation, and you will unconsciously pick the pair that produces a comfortable answer.

That screen makes the point about which number you lift. Beginners run the reverse DCF off the share price and a per share cash flow figure, which works but introduces share count questions that the market cap column has already answered for you. The Company Valuation Engine leaderboard shows price and market cap side by side, and the market cap is the one that goes into the arithmetic. You still have to get free cash flow yourself, from the filing, because that is not on the screen.

What various prices are actually asking for

Here is the translation table that made this technique click for me. Ten year explicit period, 9 percent discount rate, 2.5 percent terminal growth. The left column is the enterprise value expressed as a multiple of trailing free cash flow, which is a number you can compute in thirty seconds. The right column is the free cash flow growth rate that price requires for a decade.

Read that table once and you have a rough reverse DCF you can run in your head. A company at 40 times free cash flow is being priced for close to 15 percent annual free cash flow growth for ten straight years, and then a permanent mature business after that. Not ten percent. Not fifteen percent for three years and then whatever. Fifteen percent every year for a decade.

That framing is what makes the technique useful for retail investors specifically. You do not need a view on whether the growth happens. You need a view on whether the growth is plausible, and plausibility is something you can assess from knowing the industry, the size of the end market, and what the company has actually done over the past five years. Compare the implied number against the company's own realised growth over the last five years. If the market is paying for 15 percent and the business has delivered 6 percent, you know where the burden of proof sits.

When the implied number comes out absurd

Sometimes the answer is 30 percent for ten years, or the solver will not converge because no positive growth rate reaches the price. That is information, not a broken model, and it usually means one of three specific things.

First, trailing free cash flow is depressed by something temporary. A heavy capex year, a working capital swing, a one time settlement. Reverse DCF off a single trailing year is fragile for exactly this reason. Use a three year average of free cash flow, or normalise capex to something like depreciation plus a growth allowance, and rerun. The implied growth often drops by several points.

Second, the company is genuinely early and the market is pricing a business that does not exist yet. Reverse DCF handles this badly and you should say so rather than torturing the model. For a company with negligible current cash flow, no growth rate produces a sensible answer, and the honest conclusion is that this method does not apply to that name.

Third, your discount rate is wrong for the risk. This is the one to be careful with, because it is the excuse the model offers you every time and it is right occasionally. Applying it selectively to names you want to own is how a reverse DCF becomes a forward DCF with extra steps.

Sitting the implied path next to somebody else's verdict

Once you have an implied growth number, the interesting question is whether anything else disagrees with you, and this is where a composite screen earns its place in the workflow.

The valuation screen above fuses fundamental ratios, technical momentum and sentiment into one composite verdict per company. Its verdict and your implied growth number are built from completely different material, which is what makes the comparison worth doing. When they agree, you have learned very little. When they disagree, you have found the thing worth an hour of your time.

The two disagreements worth writing down look like this. The screen calls a name over fair value while your reverse DCF says the implied growth is modest and clearly achievable. That is usually a name where multiples look expensive against history but cash conversion is strong, and the reverse DCF is the more informative read. Or the screen looks constructive while your reverse DCF says the price requires growth the company has never once delivered. That is usually momentum and sentiment carrying a composite, and it is a good moment to check what the fundamental component is doing separately.

Neither disagreement tells you what to do. What it does is tell you which question to research, which for someone with a few hours a week is the whole game. I keep a running note with three columns: name, implied growth from my reverse DCF, and realised growth over the past five years. Names where the first number is more than double the second go on a watchlist and nowhere near a buy order until I can explain the gap in a sentence a sceptical friend would accept.