Understand the Cost of Capital
Build a discount-rate assumption that matches the cash flows and capital claims being valued.
WACC inside DCF · illustrative assumptions
Preview · Illustrative assumptions · No market dataWACC assumptions
| Component | Assumption |
|---|---|
| Risk-free rate | 3 % |
| Beta | 1.2 |
| Equity risk premium | 5 % |
| Country premium | 1 % |
| Cost of equity | 10 % |
| After-tax debt cost | 4 % |
| Debt weight | 25 % |
| Equity weight | 75 % |
| WACC | 8.5 % |
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Match the rate to the cash-flow claim
WACC is the weighted average required return of debt and equity capital for the operating business, using a consistent tax and capital-structure basis. In a conventional enterprise DCF it discounts unlevered FCFF. It is not interchangeable with the cost of equity used for an equity cash-flow valuation.
The DCF model guide connects this rate to operating cash generation. The company valuation framework defines the claim and purpose. Match nominal or real cash flows, currency, inflation assumptions and risk before comparing rate estimates.
Explain cost of equity and each additional premium
A common CAPM-based starting point is cost of equity = risk-free rate + beta × equity risk premium. Beta describes sensitivity to the selected market risk basis; it is not a universal measure of every business uncertainty. Document observation periods, leverage treatment and any additional country, size or other premium.
The preview assumes 3% risk-free rate, beta of 1.2, 5% equity risk premium and a 1% country premium, giving 10% cost of equity. These are explicit teaching assumptions, not current market estimates. Additional premiums require a rationale and should not duplicate risk already captured in the forecast or base inputs.
Use an economically relevant debt cost and tax treatment
For the conventional WACC formula, after-tax debt cost = pre-tax debt cost × (1 − tax rate). The relevant borrowing cost should reflect the assumed financing risk and tenor. Historical accounting interest divided by a debt balance can be a useful reference, but is not automatically the current marginal market cost.
With 5% pre-tax debt cost and a 20% tax assumption, the preview gives 4% after-tax debt cost. Actual tax deductibility, losses and jurisdictional limits may differ from this simplified benefit. Keep the WACC tax assumption separate from a promise of immediate cash-tax savings.
Weight capital on a consistent basis
The conventional expression is WACC = Ke × E/(D+E) + Kd × (1−T) × D/(D+E). Market-value weights are normally used for a valuation capital structure; explain a target structure or proxy where direct values are unavailable. Do not mix one market weight with another book-value weight without justification.
At 75% equity and 25% debt, 10% equity cost and 4% after-tax debt cost give 8.5% WACC. Changing the weight also requires considering whether leverage changes equity risk or borrowing cost. A lower calculated rate from adding debt alone does not establish an optimal capital structure.
Challenge value sensitivity and terminal consistency
For positive operating cash flows, a higher discount rate lowers their present value if other assumptions stay fixed. In the perpetuity formula, the gap between WACC and growth also affects terminal value. A small spread can make the conclusion highly dependent on modest input changes.
Review terminal value together with the selected rate and compare disclosed sensitivities in the method-selection framework. Scenario risk belongs in a consistent forecast and rate policy; repeatedly penalizing the same downside in both can obscure its meaning.
Keep general valuation judgment separate from product controls
BalanceCheat supports a direct WACC or an input-based builder. Its optional Model sources use the chosen bridge period; the capital source uses book equity and debt, while debt cost uses model interest and average gross debt. Those references are not automatically market estimates.
The WACC implementation reference documents sources, override behavior and incomplete inputs. Supply and justify rate assumptions independently, then use the existing DCF workflow to inspect their effect. This page adds an educational entry, not a separate WACC calculator or market-data service.
Frequently asked questions
What is the basic WACC formula?
Equity cost times its capital weight plus pre-tax debt cost times one minus the tax rate times the debt weight. Use percentage units consistently.
Should WACC discount every type of cash flow?
No. Match the rate to the claim; conventional unlevered FCFF uses WACC, while equity cash flow uses an equity rate.
Does the product’s Model capital source provide market values?
No. It references model book equity and debt. Use justified market or target weights where appropriate for the valuation.
Is there live beta or market-rate retrieval?
No. The valuation workflow uses your supplied assumptions or explicit model references.