What Is WACC %?
WACC % stands for weighted average cost of capital. It estimates the average rate of return a company must pay to all of its capital providers—primarily shareholders and lenders—to finance its assets and operations. In other words, it is the company’s blended cost of raising money.
Because most businesses are funded with a mix of equity and debt, the true cost of capital is not just the interest rate on borrowings or the return demanded by shareholders in isolation. WACC combines both, weighting each source of financing by its share of the company’s capital structure. That is why it is often described as a company’s hurdle rate: new investments generally need to earn more than WACC to create value.
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For investors, WACC matters for two main reasons. First, it is a core input in discounted cash flow (DCF) valuation, where future cash flows are discounted back to the present using a required rate of return. Second, it helps evaluate whether a company is earning returns above its cost of capital. If a business consistently generates a return on invested capital (ROIC) above its WACC, it is usually creating economic value. If ROIC falls below WACC, growth can actually destroy value rather than build it.
The basic formula is:
Where:
- E = market value of equity
- D = value of debt
- r_e = cost of equity
- r_d = cost of debt
- T = tax rate
- WACC % measures a company’s blended cost of capital across equity and debt financing.
- It is commonly used as a hurdle rate for investment decisions and as a discount rate in valuation models.
- A company that earns returns above its WACC is generally creating value; one that earns below it may be destroying value.
- GuruFocus calculates WACC using market value of equity, book value of debt, CAPM-based cost of equity, and an after-tax cost of debt.
- WACC is useful, but it is sensitive to assumptions such as beta, market risk premium, tax rate, and debt measurement.
How Is WACC % Calculated?
At a high level, WACC is the weighted average of the cost of equity and the after-tax cost of debt.
The intuition is straightforward. Equity investors require a return for taking ownership risk, while lenders require interest payments for providing debt capital. Since interest expense is generally tax-deductible, debt is adjusted by (1-T) to reflect its after-tax cost.
Cost of equity
GuruFocus uses the Capital Asset Pricing Model (CAPM) to estimate the cost of equity:
Where:
- r_f = risk-free rate
- \beta = stock beta
- r_m - r_f = market risk premium
Under the GuruFocus methodology, the risk-free rate is based on the 10-Year Treasury Constant Maturity Rate for the country or region where the company is headquartered when available, with the U.S. Treasury rate used as a fallback. GuruFocus also uses a 6% market premium in its WACC calculation methodology.[^1]^2
Cost of debt
GuruFocus uses a simplified cost of debt calculation:
More specifically, GuruFocus uses the latest trailing 12-month interest expense divided by the latest one-year average debt balance.^2
Capital weights
The weights are based on the relative proportions of equity and debt in the capital structure:
GuruFocus uses:
- Market value of equity = market capitalization
- Debt = book value of debt, typically based on short-term debt plus long-term debt and capital lease obligations, averaged over the most recent year depending on reporting frequency^2
Tax adjustment
The debt component is multiplied by one minus the tax rate:
GuruFocus calculates tax rate using trailing 12-month tax expense divided by trailing 12-month pre-tax income, with the result constrained between 0% and 100%.^2
Why formula variations exist
In practice, WACC is not perfectly standardized. Analysts may differ on:
- whether to use book value or market value of debt
- whether to include preferred stock
- which beta estimate to use
- what market risk premium assumption is appropriate
- whether to normalize tax rates or interest expense
That means WACC figures from different platforms or analysts may not match exactly, even for the same company and date.
WACC % Trend Over Time
A company’s WACC is often more informative when viewed over time rather than as a single snapshot. Changes in interest rates, stock price volatility, leverage, tax rates, and market conditions can all affect the metric.
A rising WACC may indicate that capital has become more expensive, perhaps because borrowing costs increased, the stock became riskier, or the company’s capital structure shifted toward more expensive financing. A falling WACC can suggest the opposite: easier financing conditions, lower perceived risk, or a more efficient capital structure.
For long-term investors, trend analysis is especially useful when paired with ROIC. If WACC rises while ROIC stays flat, value creation narrows. If ROIC rises while WACC remains stable, the spread improves and the business may be compounding value more effectively.
What Does WACC % Tell You?
WACC tells you the minimum return a company generally needs to earn on its invested capital to satisfy both lenders and shareholders. It is not a measure of profitability by itself. Instead, it is a benchmark against which profitability and capital allocation can be judged.
This is why WACC is so often compared with ROIC:
- ROIC > WACC: the company is earning excess returns and likely creating value
- ROIC ≈ WACC: the company is roughly breaking even on an economic basis
- ROIC < WACC: the company may be destroying value as it reinvests
WACC is also central to valuation. In a DCF model, a higher WACC reduces the present value of future cash flows, which lowers estimated intrinsic value. A lower WACC does the opposite. This is one reason growth stocks can be especially sensitive to changes in interest rates and required returns: much of their value depends on cash flows expected far in the future.
Investors also use WACC to think about business quality. Companies with durable competitive advantages, stable cash flows, and conservative balance sheets often enjoy lower costs of capital than highly cyclical, leveraged, or speculative businesses. But context matters. Utilities, banks, software firms, and commodity producers all operate under very different financing and risk profiles, so WACC should be interpreted within industry context rather than as a universal score.
Limitations of WACC %
Like any financial metric, WACC has important limitations.
First, it is highly assumption-driven. Small changes in beta, the risk-free rate, or the market risk premium can materially change the cost of equity. Since the cost of equity is usually the largest component of WACC, the final number can be quite sensitive.
Second, debt measurement is often simplified. GuruFocus uses book value of debt rather than market value of debt, which is practical but not theoretically perfect.^2 For companies with unusual debt structures, distressed bonds, or rapidly changing credit conditions, book debt may differ meaningfully from economic reality.
Third, the standard formula may omit financing layers such as preferred stock, hybrid securities, pension obligations, or off-balance-sheet commitments. In those cases, a simple debt-and-equity WACC may understate or overstate the true cost of capital.
Fourth, WACC can be misleading for companies with unstable earnings or unusual tax profiles. If pre-tax income is very low, negative, or volatile, the tax-rate input may be less informative. Similarly, interest expense may not reflect a normalized borrowing cost if debt levels changed sharply during the period.
Fifth, WACC is not equally useful across all industries. Financial institutions, for example, use debt differently from industrial companies, so traditional WACC analysis is often less straightforward for banks and insurers.
For these reasons, WACC should usually be used alongside ROIC, leverage ratios, peer comparisons, and a broader understanding of the business model.
Real-World Example
A simple way to understand WACC is to compare it with ROIC for a mature, high-quality company.
Consider Apple (AAPL). Apple is financed primarily through equity, but it also uses debt as part of its capital structure. Its WACC reflects the blended return required by both shareholders and lenders. If Apple’s ROIC remains well above its WACC—as it often has historically—that suggests the company is generating returns on capital that exceed its financing cost. That spread is one reason high-quality businesses can create so much shareholder value over time.
Now contrast that with a more capital-intensive company such as Exxon Mobil (XOM). Exxon’s business requires large ongoing investments in exploration, production, refining, and infrastructure. Even if its absolute profits are large, investors still need to know whether those profits exceed the company’s cost of capital. In commodity businesses, that spread can fluctuate significantly with oil and gas prices, making the relationship between ROIC and WACC especially important.
The lesson is that WACC is rarely most useful on its own. Its real power comes from comparison:
- against the company’s own ROIC
- against the company’s historical WACC
- against peers in the same industry
FAQs
What is a good WACC %?
- There is no universal “good” WACC. Lower is generally better, all else equal, because it means the company can fund itself more cheaply. But the most meaningful question is whether the company’s returns on capital exceed its WACC. Industry context also matters a great deal.
What is the difference between WACC % and ROIC?
- WACC measures the company’s cost of capital. ROIC measures the return the company earns on invested capital. WACC is a required return benchmark; ROIC is an achieved return. Comparing the two helps investors judge whether the company is creating or destroying value.
What is the difference between WACC % and cost of equity?
- Cost of equity reflects only the return required by shareholders. WACC blends the cost of equity with the after-tax cost of debt, weighted by the company’s capital structure.
Can WACC % be negative?
- It is uncommon, but it can happen in unusual cases if the after-tax cost of debt becomes negative or if certain inputs produce an abnormal result. In practice, a negative WACC usually signals that the assumptions or inputs deserve closer review rather than indicating a normal economic condition.
How should investors use WACC %?
- Investors should use WACC as a benchmark, not as a standalone verdict. It is most useful when paired with ROIC, DCF valuation, peer comparisons, and trend analysis. A company with a stable or declining WACC and a consistently higher ROIC is often in a stronger position than one whose returns barely cover its cost of capital.
- PE Ratio - A stock's price divided by its earnings per share, the most widely used valuation multiple for comparing a stock's cost relative to its profits.
- PB Ratio - A stock's price divided by its book value per share, measuring how much investors are paying for each dollar of net assets.
- PS Ratio - A stock's price divided by its revenue per share, useful for valuing companies with low or negative earnings.
- Price-to-Free-Cash-Flow - A stock's price divided by free cash flow per share, a popular alternative to the PE ratio that focuses on real cash generation.
- ROE % - Net income divided by shareholders' equity, measuring how efficiently a company generates profit from the money shareholders have invested.
- ROIC % - Net operating profit after tax divided by invested capital, measuring how effectively a company deploys its capital to generate returns.
Summary
WACC % is one of the most important concepts in corporate finance because it links financing, valuation, and capital allocation into a single framework. It estimates the blended return required by a company’s debt and equity holders and serves as a hurdle rate for judging whether investments are worthwhile.
For investors, the most important use of WACC is not simply knowing whether it is high or low. It is understanding how it compares with the returns the business actually earns. When a company consistently earns more than its WACC, it is usually creating economic value. When it does not, growth may be far less attractive than it appears.
Used thoughtfully, WACC can help investors better evaluate business quality, intrinsic value, and management’s capital allocation discipline.
Sources
- U.S. Securities and Exchange Commission, “Cost of Capital and Discount Rates” (Investor and valuation guidance): https://www.sec.gov/
- GuruFocus, “WACC Calculator” methodology and field definitions: https://www.gurufocus.com/calculator/wacc-calculator
- Investopedia, “Weighted Average Cost of Capital (WACC) Explained”: https://www.investopedia.com/terms/w/wacc.asp
- Corporate Finance Institute, “Weighted Average Cost of Capital (WACC)”: https://corporatefinanceinstitute.com/resources/valuation/what-is-wacc-formula/
- New York University Stern School of Business, Aswath Damodaran, data and notes on cost of capital: https://pages.stern.nyu.edu/~adamodar/
- Federal Reserve Bank of St. Louis, 10-Year Treasury Constant Maturity Rate: https://fred.stlouisfed.org/series/DGS10