WACC vs Discount Rate

The Short Answer

WACC and the discount rate are related but not identical. WACC is one specific type of discount rate — the one used to discount a company's free cash flows to the firm (FCFF) in a standard DCF valuation. But "discount rate" is a broader concept that can refer to many different rates depending on what you are discounting and why.

The confusion is common and understandable because in the context of corporate valuation, people often use the two terms interchangeably. In that specific context, they are the same thing. Outside that context, they are not.

What is a Discount Rate?

A discount rate is any rate used to calculate the present value of future cash flows. The core principle behind discounting is the time value of money — a dollar received in the future is worth less than a dollar received today, because today's dollar can be invested and earn a return.

The present value formula is:

Where n is the number of periods (usually years). The discount rate you choose should reflect the risk and opportunity cost of the specific cash flows being valued. Different cash flows carry different risks — and therefore require different discount rates.

What is WACC?

WACC (Weighted Average Cost of Capital) is the blended rate of return required by all of a company's capital providers — both debt holders and equity holders — weighted by the proportion each represents in the total capital structure.

WACC represents the minimum return the entire business must generate to satisfy everyone who has put money into it. It accounts for the cost of equity (what shareholders demand), the cost of debt (what lenders charge), the tax shield on debt, and the weighting of each in the capital structure.

Side-by-Side Comparison

When WACC Is the Right Discount Rate

WACC is the correct discount rate to use in one specific and important scenario: when you are valuing a company using a Discounted Cash Flow (DCF) model that projects Free Cash Flow to the Firm (FCFF).

FCFF represents cash flows available to all capital providers — both debt and equity holders. Because these cash flows belong to the whole firm, you discount them at the rate that reflects the cost to the whole firm, which is WACC.

This is the standard approach used by investment bankers, equity analysts, and private equity firms when valuing companies for M&A transactions, IPOs, or portfolio assessment.

When a Different Discount Rate Is Used

There are several situations where the correct discount rate is something other than WACC:

Free Cash Flow to Equity (FCFE) models. If you are only discounting cash flows available to equity holders — after debt payments have already been made — you should use the cost of equity (Re) as the discount rate, not WACC. Using WACC here would double-count the debt cost.

Dividend Discount Model (DDM). When valuing a stock by discounting its projected dividends, the appropriate discount rate is the cost of equity (typically calculated via CAPM), not WACC. Dividends only flow to shareholders, not to debt holders.

Project-level capital budgeting. When evaluating a specific internal investment project — not the whole company — the discount rate should reflect the risk of that individual project, not the company's overall WACC. A low-risk project might justify a rate below WACC; a high-risk project should use a rate above it.

Adjusted Present Value (APV). In the APV method, free cash flows are first discounted at the unlevered cost of equity (as if the firm had no debt), then the tax shield is valued separately. This approach uses a different discount rate structure entirely from WACC.

Government and central bank discount rates. In monetary policy, central banks set an official "discount rate" for lending to commercial banks. This is completely unrelated to corporate finance WACC — same term, entirely different concept.

Practical Example: Same Company, Different Rates

Does WACC Change When the Discount Rate Changes?

This question often comes up when people discuss the Federal Reserve raising or lowering interest rates. The answer is: yes, indirectly and directly.

When the risk-free rate rises (as it did sharply in 2022–2023), WACC increases through two channels. First, the cost of equity rises because CAPM adds a premium above the risk-free rate — when Rf goes up, Re goes up. Second, the cost of debt rises as companies refinance existing debt or take on new debt at higher market rates. Both effects push WACC higher, which mathematically reduces the present value of future cash flows and therefore lowers company valuations.

This is exactly why rising interest rates consistently cause stock market valuations to compress — the discount rate applied to future earnings and cash flows has increased.

The Bottom Line

Think of it this way: WACC is always a discount rate, but a discount rate is not always WACC. In the specific context of a firm-level DCF valuation, they are the same. In all other contexts — equity-only valuations, project analysis, monetary policy — the discount rate will be something different.

For standard company valuation, use WACC. Use our free calculator to compute it instantly:

📊 Calculate WACC Free → β WACC with Beta (CAPM) →