What does a reverse DCF add if I already have a DCF?

The DCF shows what we assume. The reverse DCF shows what the market assumes. Only the comparison shows how far apart they are.

Is a stock with high implied growth automatically overvalued?

No. It only means a lot of future is in the price. Whether the expectation is realistic has to be argued, for example with market size, margins and competition.

Can I calculate this myself?

Yes. On the Tesla page you can move growth, margin and WACC in the calculator until the value hits the price.

Knowledge · Expectations in the price

Reverse DCF explained simply

A normal DCF goes from assumptions to value. A reverse DCF works back from the share price and asks which assumptions the market is paying for right now.

At a glance

You hold WACC and terminal growth fixed and solve for growth or margin until the model hits the price.
So you do not have to forecast anything, you only check whether the expectation in the price is plausible.
It is most useful for hype stocks whose DCF sits far from the price.
The method goes back to Rappaport and Mauboussin (“Expectations Investing”).

Regular DCF and reverse DCF

Formula

Price × shares + net debt = Σ FCFₜ ÷ (1 + WACC)ᵗ + terminal value

Solve for the initial growth rate g₁ at which both sides are equal.

Worked example 1: Tesla (as of Oct 16, 2026)

Inputs: owner FCF $8.41bn, 3.95bn shares, net cash $27.4bn and growth fading linearly to 3% over ten years. We solve for the initial growth at which the value equals the $354.72 share price.

WACC	Initial growth needed	Our base
13.2%	approx. 85%	25% → $55.7
8.0%	approx. 57%	25% → $115

Even a very low WACC of 8% does not close the gap: about 57% growth per year is still needed at the start.
Our base assumes 25% and arrives at $55.7.

Reverse DCF Tesla: required growth

Worked example 2: Alphabet, solved for margin (as of Oct 29, 2026)

Here growth is held fixed and we solve for the target FCF margin. The price needs about 28% margin. Our range is 15 / 20 / 25%, so the price asks for slightly more than our bull case.

Worked example 3: Amazon, solved for WACC

The price implies a WACC of about 7.0% instead of almost 11% (analysis: 10.86%). Anyone who regards the price as fair has to assume much lower capital costs. This example also appears on the WACC page.

What the number does

Hardly any large company has ever sustained 85% annual FCF growth over several years. The reader sees for themselves how much future is in the price.
The reverse DCF does not replace a valuation, it translates the price into assumptions you can argue about.

Pitfalls

The result depends on WACC and terminal growth. That is why we show both curves.
A reverse DCF is not a verdict, it is a translation of the price into assumptions.
Option value is hard to capture. A product like FSD that is not yet a business is in no FCF path.

FAQ

What does a reverse DCF add if I already have a DCF? The DCF shows what we assume. The reverse DCF shows what the market assumes. Only the comparison shows how far apart they are.
Is a stock with high implied growth automatically overvalued? No. It only means a lot of future is in the price. Whether the expectation is realistic has to be argued, for example with market size, margins and competition.
Can I calculate this myself? Yes. On the Tesla page you can move growth, margin and WACC in the calculator until the value hits the price.