WACC Calculator: The Role of Short-Term Debt

Analyze how including or excluding short-term debt impacts the Weighted Average Cost of Capital (WACC) to inform your valuation and financing decisions.

What is the Weighted Average Cost of Capital (WACC)?

The Weighted Average Cost of Capital (WACC) is a financial metric that calculates a company’s average cost of financing by averaging the rate of all its capital sources, primarily debt and equity, weighted by their proportion in the company’s capital structure. It represents the minimum return a company must earn on its existing asset base to satisfy its investors, creditors, and other providers of capital. The central question for many analysts is, do you use short-term debt when calculating WACC? The answer affects the denominator of the WACC formula and, therefore, the final cost of capital figure used in valuations.

WACC Formula and Explanation

The core debate lies in what constitutes ‘Total Debt’. The WACC formula itself is standard. The variation comes from whether ‘D’ includes only long-term debt or both long-term and short-term debt.

Formula when excluding short-term debt:

WACC = (E / (E + D)) * Re + (D / (E + D)) * Rd * (1 – t)

Formula when including short-term debt:

WACC = (E / (E + D + STD)) * Re + ((D + STD) / (E + D + STD)) * Rd * (1 – t)

WACC Formula Variables

Variable	Meaning	Unit	Typical Range
E	Market Value of Equity	Currency	Varies
D	Market Value of Long-Term Debt	Currency	Varies
STD	Market Value of Short-Term Debt	Currency	Varies
Re	Cost of Equity	Percentage (%)	5% – 20%
Rd	Cost of Debt	Percentage (%)	2% – 10%
t	Corporate Tax Rate	Percentage (%)	15% – 35%

Practical Examples

Example 1: Company with Negligible Short-Term Debt

Consider a mature manufacturing firm with a stable capital structure.

• Inputs: E = $2000M, D = $500M, STD = $20M, Re = 7%, Rd = 4%, t = 25%
• Calculation (Excluding STD): Total Capital = $2500M. WACC = (2000/2500)*7% + (500/2500)*4%*(1-0.25) = 5.6% + 0.6% = 6.20%
• Calculation (Including STD): Total Capital = $2520M. WACC = (2000/2520)*7% + (520/2520)*4%*(1-0.25) = 5.56% + 0.62% = 6.18%
• Result: In this case, the impact is minimal. Excluding short-term debt is a common and reasonable simplification.

Example 2: Company Reliant on Short-Term Financing

Consider a retail company that uses a significant revolving credit facility to manage seasonal inventory.

• Inputs: E = $800M, D = $200M, STD = $300M, Re = 10%, Rd = 6%, t = 20%
• Calculation (Excluding STD): Total Capital = $1000M. WACC = (800/1000)*10% + (200/1000)*6%*(1-0.20) = 8% + 0.96% = 8.96%
• Calculation (Including STD): Total Capital = $1300M. WACC = (800/1300)*10% + (500/1300)*6%*(1-0.20) = 6.15% + 1.85% = 8.00%
• Result: Here, excluding short-term debt materially overstates the WACC. Including it provides a more accurate picture of the company’s true cost of capital.

How to Use This WACC Calculator

Follow these steps to understand the impact of short-term debt on your company’s WACC.

1. Enter Capital Values: Input the market value of equity, long-term debt, and short-term debt.
2. Enter Costs: Provide the cost of equity, pre-tax cost of debt, and the corporate tax rate as percentages.
3. Toggle Short-Term Debt: Use the checkbox to see how the WACC changes when short-term debt is included or excluded from the capital structure.
4. Analyze Results: The calculator provides a primary WACC result, intermediate values like capital weights, and a bar chart for easy comparison.

Key Factors That Affect the Decision

• Permanence of Debt: Is the short-term debt a permanent part of the financing strategy (e.g., a consistently used credit line) or temporary? Permanent debt should almost always be included.
• Materiality: How large is the short-term debt relative to the total capital? If it’s very small, its impact may be negligible.
• Interest-Bearing Nature: Only interest-bearing debt should be included. Operational liabilities like accounts payable are not part of the WACC calculation.
• Cost of Debt: If the cost of short-term debt is significantly different from long-term debt, a more complex, weighted cost of debt may be needed.
• Industry Practice: Certain industries have norms for how they treat short-term debt in valuations.
• Purpose of Analysis: For a long-term DCF valuation, some argue for excluding temporary short-term debt. For a current snapshot of capital cost, inclusion is more accurate.

Frequently Asked Questions (FAQ)

1. So, what is the definitive answer? Do you use short-term debt when calculating WACC?

The most theoretically correct answer is yes, all interest-bearing debt, regardless of maturity, should be included as it represents a source of capital that requires a return. However, for practical purposes, many analysts exclude it if it’s immaterial or not a permanent source of funding.

2. Why does WACC often decrease when I include short-term debt?

This happens because debt is typically cheaper than equity, and its interest is tax-deductible. By adding more, cheaper debt to the total capital mix, you lower the overall weighted average cost.

3. Should accounts payable be included in short-term debt for WACC?

No. Accounts payable is a non-interest-bearing liability that arises from operations. WACC calculations only include interest-bearing (or financing) liabilities.

4. How do I find the ‘market value’ of debt?

If the debt is publicly traded (bonds), use its market price. For bank loans and non-traded debt, the book value is often used as a reasonable proxy, as its value doesn’t fluctuate like equity.

5. What is the Cost of Equity (Re)?

It’s the return shareholders require for their investment. It is commonly calculated using the Capital Asset Pricing Model (CAPM), which factors in the risk-free rate, the stock’s beta (volatility), and the market risk premium.

6. Why is the cost of debt adjusted for taxes?

Interest payments on debt are tax-deductible expenses, which creates a ‘tax shield’ that reduces the effective cost of debt for a company. This makes debt a cheaper source of financing than equity.

7. What is a ‘good’ WACC?

A lower WACC is generally better, as it indicates a company can finance its operations more cheaply. However, what constitutes a “good” WACC is highly industry-specific and depends on market conditions and company risk.

8. Can this calculator handle different costs for short-term and long-term debt?

This calculator uses a single ‘Cost of Debt’ for simplicity. In a more complex model, you could calculate a weighted average cost of debt first, and then use that figure as the ‘Rd’ in the WACC formula.