Free Cash Flow Calculator: The Role of Interest Expense

A tool to clarify whether you use interest expense in calculating free cash flow by demonstrating the difference between FCFF and FCFE.

Free Cash Flow Calculator

What is Free Cash Flow and Why Does Interest Expense Matter?

Free Cash Flow (FCF) represents the cash a company generates after accounting for the cash outflows to support operations and maintain its capital assets. Unlike earnings or net income, FCF is a measure of profitability that excludes the non-cash expenses recorded on the income statement and includes spending on equipment and assets as well as changes in working capital. The question of **do you use interest expense in calculating free cash flow** is critical because the answer depends on *who* the cash flow is for. This distinction leads to two different, but related, metrics: Free Cash Flow to the Firm (FCFF) and Free Cash Flow to Equity (FCFE).

Understanding this difference is vital for investors, creditors, and financial analysts. FCFF is the cash available to all capital providers (both debt and equity holders), while FCFE is the cash available only to equity holders. The treatment of interest expense is the core difference between them.

Free Cash Flow Formulas and Explanation

The calculation differs depending on whether you want to find the cash flow for the entire firm or just for equity shareholders.

Free Cash Flow to the Firm (FCFF)

FCFF is calculated *before* deducting interest expense because it represents cash available to all investors, including lenders who receive interest. The formula starts with Earnings Before Interest and Taxes (EBIT).

FCFF = EBIT * (1 - Tax Rate) + D&A - CapEx - Change in NWC

Free Cash Flow to Equity (FCFE)

FCFE is calculated *after* accounting for cash flows to debt holders (interest payments) and also considers cash flow from new debt or debt repayments.

FCFE = FCFF - [Interest Expense * (1 - Tax Rate)] + Net Borrowing

Key Variables in Free Cash Flow Calculation

Variable	Meaning	Unit	Typical Range
EBIT	Earnings Before Interest and Taxes	Currency ($)	Varies widely
Tax Rate	Corporate tax rate	Percentage (%)	15% – 35%
D&A	Depreciation & Amortization	Currency ($)	Positive value
CapEx	Capital Expenditures	Currency ($)	Varies, can be > D&A for growing firms
Change in NWC	Change in Net Working Capital	Currency ($)	Positive or Negative
Interest Expense	Cost of borrowing	Currency ($)	Varies based on debt load

Practical Examples

Example 1: Growing Tech Company

A software company is investing heavily in new servers (CapEx) and has taken on debt to fund its expansion.

• Inputs: EBIT = $2,000,000, Tax Rate = 22%, D&A = $300,000, CapEx = $500,000, Change in NWC = $100,000, Interest Expense = $150,000, Net Borrowing = $200,000.
• FCFF Calculation: ($2M * (1 – 0.22)) + $300k – $500k – $100k = $1,560,000 + $300k – $500k – $100k = $1,260,000. This is the cash available to all investors.
• FCFE Calculation: $1.26M – [$150k * (1 – 0.22)] + $200k = $1.26M – $117k + $200k = $1,343,000. This is the cash available to shareholders after debt obligations. Check out our Levered vs. Unlevered Free Cash Flow guide for more details.

Example 2: Stable Manufacturing Company

A mature company with stable operations and minimal new debt.

• Inputs: EBIT = $5,000,000, Tax Rate = 28%, D&A = $1,000,000, CapEx = $800,000, Change in NWC = $200,000, Interest Expense = $400,000, Net Borrowing = -$100,000 (debt repayment).
• FCFF Calculation: ($5M * (1 – 0.28)) + $1M – $800k – $200k = $3,600,000 + $1M – $800k – $200k = $3,600,000.
• FCFE Calculation: $3.6M – [$400k * (1 – 0.28)] – $100k = $3.6M – $288k – $100k = $3,212,000. See our article on Capital Expenditure Analysis to learn more.

How to Use This ‘Do You Use Interest Expense in Calculating Free Cash Flow’ Calculator

1. Enter Financial Data: Input your company’s figures for EBIT, tax rate, D&A, CapEx, Change in NWC, Interest Expense, and Net Borrowing into the respective fields.
2. Click ‘Calculate’: The calculator will instantly process the numbers.
3. Analyze the Results: The tool will display both Free Cash Flow to the Firm (FCFF) and Free Cash Flow to Equity (FCFE).
4. Understand the Difference: Note how FCFF ignores the interest expense initially, while FCFE subtracts the after-tax interest cost. This directly answers the question of how to handle interest expense. The chart visually demonstrates this difference. For more on the inputs, see our article on What is Net Working Capital?

Key Factors That Affect Free Cash Flow

• Operating Profitability (EBIT): Higher operating profits directly lead to higher free cash flow, all else being equal.
• Tax Rate: A lower tax rate means less cash paid to the government, increasing the cash available for investors.
• Capital Expenditures (CapEx): High CapEx reduces FCF. This is typical for growing companies. A key metric to watch is CapEx relative to D&A.
• Working Capital Management: Efficiently managing inventory and receivables can free up significant cash and boost FCF.
• Financing Decisions: The amount of debt a company uses affects its interest expense and net borrowing, directly impacting FCFE.
• Non-Cash Charges: Higher D&A increases FCF because it’s a non-cash expense that provides a tax shield. Our Unlevered Free Cash Flow Calculator can provide additional insights.

Frequently Asked Questions (FAQ)

1. Why is interest expense treated differently in FCFF and FCFE?

Because they serve different purposes. FCFF measures total cash available to all capital providers (debt and equity), so it’s calculated before payments to any specific provider. FCFE measures cash available only to equity holders, so payments to debt holders (interest) must be removed.

2. Is a negative free cash flow always a bad sign?

Not necessarily. A rapidly growing company might have negative FCF because it is investing heavily in capital expenditures (CapEx) to fuel future growth. However, consistently negative FCF in a mature company can be a red flag.

3. Why do you add back D&A when calculating free cash flow?

Depreciation and Amortization are non-cash expenses. They are subtracted on the income statement for tax purposes, but no actual cash leaves the company. We add them back to get a true picture of cash generation.

4. Can FCFE be higher than FCFF?

Yes. This happens when a company issues a significant amount of new debt. The cash inflow from the new borrowing can be larger than the after-tax interest expense, causing FCFE to exceed FCFF for that period.

5. Which is better for valuation: FCFF or FCFE?

Both can be used. Using FCFF in a Discounted Cash Flow (DCF) model gives you the Enterprise Value of the company. Using FCFE in a DCF gives you the Equity Value directly. FCFF is often preferred because it’s less affected by changes in capital structure. Learn more in our FCFF vs. FCFE guide.

6. How is this different from Operating Cash Flow (OCF)?

Operating Cash Flow, found on the cash flow statement, is the starting point for one method of calculating FCF. The main difference is that FCF subtracts Capital Expenditures (CapEx), whereas OCF does not.

7. What does a change in Net Working Capital (NWC) mean for cash flow?

An increase in NWC (e.g., rising inventory or accounts receivable) is a use of cash, which reduces FCF. A decrease in NWC is a source of cash, which increases FCF.

8. Should I use this calculator for my personal finances?

No, this calculator is designed for corporate finance analysis. Free cash flow is a metric used to evaluate businesses, not personal financial health.