📚 PASS Research Analyst Certification Examination Difficulty: Beginner ℹ️ Info   ~5 min read
📌 Chapter 10.5 — Discounted Cash Flows Model for Business Valuation

Imagine you are analyzing an infrastructure company in India that is aggressively expanding its debt to fund a new project. You are building a DCF model to determine its intrinsic value, but you notice that as the debt-to-equity ratio shifts, your valuation swings wildly. You are effectively toggling between the cost of debt and the cost of equity, trying to find the Weighted Average Cost of Capital (WACC).

Because the firm is leveraging its balance sheet, the tax shield from interest payments starts to play a significant role in lowering the overall hurdle rate required by capital providers.

WACC represents the blended cost of financing a business, weighted by the market value of its debt and equity. When a company changes its capital structure—such as issuing non-convertible debentures or repaying bank loans—the weights in the WACC formula shift accordingly. In the Indian market, where debt costs are often lower than equity costs due to interest tax shields, increasing the proportion of debt can technically lower the WACC.

However, as an analyst, you must recognize that this decrease is not infinite; as debt rises, the financial risk to shareholders increases, which forces the cost of equity to rise as compensation for that added risk.

Consider a case where a mid-cap manufacturing firm decides to replace expensive equity with low-interest term loans. On paper, the WACC drops, inflating the present value of future cash flows in your DCF. A naive analyst might see this as a pure value-creation event. A seasoned analyst, however, realizes that the firm has simply moved the risk profile.

The higher interest burden could threaten solvency during a cyclical downturn, and the increased beta—reflecting higher financial leverage—will eventually pull the cost of equity upward, neutralizing the initial gains in the WACC calculation.

Effective research requires you to maintain a consistent view of the firm’s target capital structure. If you project a company will eventually move toward a more conservative debt-to-equity ratio, you must adjust your WACC assumptions for the terminal period accordingly. Ignoring these mechanics leads to valuation models that fail to capture the reality of capital market interactions, rendering your price target essentially meaningless in the eyes of institutional clients who prioritize risk-adjusted returns.

Nuance

⚠️ Nuance
Many candidates incorrectly assume that because debt is cheaper than equity, a company can infinitely lower its WACC by taking on more debt. They often overlook that the cost of equity is not static; it is a function of the firm’s leverage, often captured by the levered beta. An analyst must understand that the ‘optimal capital structure’ is the point where the marginal benefit of the tax shield is exactly offset by the marginal increase in bankruptcy risk and the rising cost of equity.

Check Your Understanding

Practice Question 1

A firm decides to increase its financial leverage by replacing 20% of its equity with long-term debt. Which of the following describes the most likely impact on the WACC in your valuation model, assuming all other operational factors remain constant?

Practice Question 2

When conducting a two-stage DCF valuation for a company planning to reduce its debt significantly over the next five years, how should an analyst adjust the WACC?

This is a companion read for Section 10.5 — Discounted Cash Flows Model for Business Valuation from PASS Research Analyst Certification Examination by Akhilesh Gururani, available on Amazon Kindle.

Copyright © 2026 Akhilesh Gururani. All rights reserved.