What Does WACC Stand For?
WACC stands for Weighted Average Cost of Capital. It is one of the most fundamental and widely used metrics in corporate finance, investment banking, and business valuation. Despite sounding complex, the core concept is straightforward: WACC tells you the average rate a company must pay to finance itself, taking into account all of its funding sources.
WACC in Plain English
Think of a company that needs money to run its business. It has two main ways to raise that money: it can borrow money (debt) or it can sell ownership shares to investors (equity). Each of these comes with a cost:
- The cost of borrowing money is the interest rate the company pays on its loans and bonds.
- The cost of equity is the return that shareholders expect to earn for taking on the risk of owning the company.
WACC combines these two costs into a single number, weighted by how much of each type of financing the company uses. If a company is 70% financed by equity and 30% by debt, WACC gives more weight to the cost of equity in the calculation.
The WACC Formula
The standard WACC formula is:
WACC = (E/V × Re) + (D/V × Rd × (1 − Tc))
Where:
- E = Total equity value (market capitalization)
- D = Total debt value
- V = Total capital = E + D
- Re = Cost of equity (return required by shareholders)
- Rd = Cost of debt (interest rate on debt)
- Tc = Corporate tax rate
The (1 − Tc) term is crucial. It accounts for the fact that interest payments on debt are tax-deductible, which effectively reduces the real cost of debt. This is called the "tax shield" on debt — one reason why companies often prefer to use some debt financing.
Why Does WACC Matter?
WACC is used in three critical ways in real-world finance:
- Business Valuation (DCF): In a Discounted Cash Flow model, analysts discount all projected future cash flows back to the present using WACC as the discount rate. A lower WACC results in a higher company valuation.
- Investment Decision Making: Companies use WACC as their "hurdle rate" — the minimum return any new project or investment must earn to be considered worthwhile. If a project's expected return is below WACC, it is destroying value.
- Capital Structure Optimization: By analyzing how WACC changes with different mixes of debt and equity, companies can identify the capital structure that minimizes WACC and therefore maximizes firm value.
A Simple WACC Example
Let's say a company has the following capital structure:
- Equity: $700,000 at a cost of equity of 12%
- Debt: $300,000 at an interest rate of 6%
- Corporate tax rate: 21%
- Total capital (V): $1,000,000
Calculating WACC:
WACC = (700/1000 × 12%) + (300/1000 × 6% × (1 − 21%))
WACC = (0.70 × 0.12) + (0.30 × 0.06 × 0.79)
WACC = 0.084 + 0.01422
WACC = 9.82%
This means the company must earn at least a 9.82% return on all its assets to satisfy both its shareholders and lenders. Any project generating above 9.82% creates value; anything below destroys it.
Try It Yourself
Ready to calculate your own WACC? Use our free calculator to get an instant result with a visual breakdown and plain-English interpretation: