Discounted Cash Flow Explained: A Beginner's DCF Guide

A discounted cash flow model, often called a DCF, estimates a company's value by projecting future cash flows and discounting them back to today. The idea is that money in the future is worth less than money now because investors require a return for time and risk.

DCF models can be useful because they force investors to make assumptions explicit. They can also create false precision if the inputs are treated as facts.

Project future cash flow#

The first step is estimating future free cash flow. That usually starts with revenue growth, margins, taxes, capital spending, and working-capital needs.

The farther out the forecast goes, the less certain it becomes. A small change in growth or margins can create a large change in estimated value.

Choose a discount rate#

The discount rate reflects the return investors require for the risk of those cash flows. Higher risk generally means a higher discount rate and a lower present value.

There is no perfect discount rate. Analysts often use a weighted average cost of capital, but the estimate depends on assumptions about debt costs, equity risk, taxes, and capital structure.

Estimate terminal value#

Many DCF models include a terminal value because much of a company's value may come after the explicit forecast period. This can be based on a long-term growth rate or an exit multiple.

Terminal value can dominate the model. If most of the valuation comes from year six and beyond, the final output is highly sensitive to long-term assumptions.

The takeaway#

A DCF is best used as a framework for thinking, not as a precise answer. Build conservative, base, and optimistic cases, then ask which assumptions must be true for the current stock price to make sense.