When and how should a company adjust its WACC for project-specific or country-specific risk?

Using the firm's overall WACC for all projects is a common mistake that can lead to value-destroying decisions. CFA Level II tests when and how to adjust.

When to Adjust WACC:

The firm's WACC is appropriate only if the project has the same risk profile and capital structure as the firm overall. Adjustments are needed when:

1. Project risk differs from firm risk — e.g., a utility company entering a tech venture
2. Capital structure differs — e.g., the project uses more debt than the firm average
3. Country risk differs — e.g., investing in an emerging market with political risk

Method 1: Pure-Play Approach for Project Beta

If the project's risk differs from the firm, find a 'pure-play' comparable company:

1. Identify a publicly traded company in the same business as the project
2. Get its equity beta (levered beta)
3. Unlever it to remove the comparable's capital structure: Beta_asset = Beta_equity / [1 + (1-t) x (D/E)]
4. Re-lever using the project's target capital structure: Beta_project = Beta_asset x [1 + (1-t) x (D/E_project)]
5. Calculate the project's cost of equity using CAPM: Ke = Rf + Beta_project x MRP
6. Calculate WACC using the project's target weights

Example:

Harborstone Conglomerate (diversified, WACC = 9%) evaluates a biotech project.

• Pure-play comparable: Crestview Biosciences (Beta_equity = 1.45, D/E = 0.30, tax rate = 25%)
• Unlever: Beta_asset = 1.45 / [1 + 0.75 x 0.30] = 1.45 / 1.225 = 1.184
• Project target D/E = 0.20, tax rate = 25%
• Re-lever: Beta_project = 1.184 x [1 + 0.75 x 0.20] = 1.184 x 1.15 = 1.362
• Cost of equity: 4% + 1.362 x 6% = 12.17%
• Project WACC (with 20% debt at 5%): 0.833 x 12.17% + 0.167 x 5% x 0.75 = 10.14% + 0.63% = 10.77%

Using the firm's 9% WACC would understate the project's required return and potentially lead to accepting a value-destroying project.

Method 2: Country Risk Premium (CRP)

For international projects, add a CRP to the cost of equity:

Ke = Rf + Beta x MRP + CRP

CRP can be estimated as:

• Sovereign yield spread (e.g., Brazil government bond yield minus US Treasury yield)
• Adjusted for equity market volatility: CRP = Sovereign spread x (Equity vol / Bond vol)

Exam tip: CFA Level II frequently presents a scenario where a firm uses its corporate WACC for a project with different risk characteristics and asks you to identify the error. Know the pure-play method (unlever, re-lever) and when to add a CRP.

For more on cost of capital topics, explore our CFA Level II corporate finance module on AcadiFi.