Daily Economics, Business and Finance Study

September 25, 2026 (KST) · Day 6
Today's topic: Why FCF Is Central to Enterprise Value: OCF, CapEx, Maintenance and Growth Investment

1. Review of the previous lesson

On Day 5, we divided cash flows into operating, investing and financing activities and learned to calculate operating cash flow (OCF) by adjusting net income for non-cash items and working-capital changes. Today, we subtract necessary CapEx from OCF to calculate FCF and examine its connection to enterprise value.

2. Today's core concepts

Free cash flow, or FCF, is the cash remaining after subtracting capital expenditure on necessary business assets, such as factories, equipment and servers, from cash generated by operations.

The most widely used simple formula is:

\[ FCF=OCF-CapEx \]

FCF provides actual funding for:

• Debt repayment
• Dividend payment
• Share repurchases
• Business acquisitions
• Additional growth investment
• Cash accumulation

If enterprise value is the present value of future cash flows, the key is not merely whether current FCF is large, but how much FCF the company can sustainably generate in the future. That is what to assess.

3. Concepts explained

3-1. OCF is not all cash available to shareholders

Even with OCF of KRW 1 trillion, spending 9,000 on maintaining and expanding factories, equipment and servers leaves FCF of only 1,000 (the latter two amounts in KRW 100 million units).

\[ FCF=OCF-CapEx \]

For capital-intensive businesses, FCF can therefore be very small or negative even with high OCF if CapEx is larger.

Conversely, software and platform businesses that need relatively little additional capital investment may convert much of their OCF into FCF.

3-2. Find CapEx under investing activities in the cash flow statement

CapEx is expenditure on assets intended for long-term use.

Typical items include:

• Construction of factories and buildings
• Purchases of production equipment
• Purchases of servers and network equipment
• Construction of data centers
• Purchases of vehicles and logistics equipment
• Purchases of software and some intangible assets

The cash flow statement commonly uses labels such as:

• Acquisition of property, plant and equipment
• Additions to property, plant and equipment
• Acquisition of intangible assets
• Purchases of property and equipment
• Capital expenditures

However, CapEx announced in an earnings release does not always equal purchases of tangible assets in the cash flow statement.

Common reasons for differences include:

• Whether intangible assets or internally developed software are included
• Whether finance leases and right-of-use assets are included
• Equipment delivered but not yet paid for
• Whether proceeds from selling property and equipment are deducted
• Tangible assets obtained through acquisitions
• Whether company-defined strategic investments are included

Use consistent CapEx definitions when comparing FCF across companies.

3-3. Maintenance CapEx and growth CapEx

Total CapEx can be broadly divided into two categories by economic purpose.

Maintenance CapEx

Investment needed to maintain existing capacity and revenue.

Examples include:

• Replacing aging equipment
• Maintaining existing factories
• Replacing essential security systems
• Upgrading equipment for regulatory compliance
• Maintaining existing server performance

Skipping maintenance CapEx can make short-term FCF appear larger while weakening long-term capacity and competitiveness.

Growth CapEx

Investment intended to increase future revenue and profit.

Examples include:

• New semiconductor production lines
• AI data center expansion
• Construction of new logistics centers
• Telecom networks in new regions
• Capacity expansion
• Building software or platforms for new businesses

Growth CapEx reduces current FCF but can increase future FCF if investment returns are high.

\[\text{Growth CapEx}\rightarrow\text{More production or service capacity}\rightarrow\text{Higher revenue}\rightarrow\text{Higher future OCF and FCF}\]

Conversely, a mistaken demand outlook may lead to:

\[\text{Excessive CapEx}\rightarrow\text{Low utilization}\rightarrow\text{Depreciation burden}\rightarrow\text{Lower prices}\rightarrow\text{Weaker future FCF}\]

3-4. Disclosures often do not clearly separate maintenance and growth CapEx

Most financial statements show only total CapEx without a clear maintenance/growth split. Analysts must estimate it by combining:

• Management's CapEx guidance
• Plans for new factories, data centers and production lines
• Capacity growth rate
• Increase in construction in progress
• Comparison of tangible asset purchases with depreciation
• Average useful life of existing equipment
• Revenue growth and capacity utilization
• Management comments on maintenance investment

Depreciation is sometimes used as a proxy for maintenance CapEx, but this is imperfect.

• Inflation can make replacement costs exceed historical acquisition costs.
• Actual equipment life may differ from its accounting useful life.
• Rapid technological change may require earlier-than-expected replacement.
• Growth investment increases depreciation with a lag.

The following is therefore a rough estimate, not a definitive calculation.

\[\text{Maintenance CapEx}\approx\text{Depreciation}\]

3-5. Simple FCF and cash after maintenance investment serve different purposes

Suppose a company spends total CapEx of 400, consisting of maintenance investment of 150 and growth investment of 250 (units: KRW 100 million).

• Disclosure-based simple FCF: Subtract total CapEx of 400 (KRW 100m) from OCF
• Cash-generation analysis of the existing business: Subtract estimated maintenance CapEx of 150 (KRW 100m) from OCF

The two calculations answer different questions.

Valuation requires analyzing actual FCF together with how much growth investment will increase future FCF. Simply excluding growth CapEx to inflate FCF is risky because spending already incurred represents a real cash outflow.

3-6. Negative FCF is not necessarily bad

Distinguish two broad reasons for negative FCF.

Potentially positive negative FCF

• Positive OCF from the core business
• Expansion backed by demonstrated customer demand
• Long-term contracts or an order backlog
• High expected returns after investment
• Ample cash and a low borrowing burden
• CapEx expected to normalize after a period

Dangerous negative FCF

• Persistently negative OCF itself
• Borrowing and equity issuance to cover operating losses
• Aggressive expansion without evidence of demand
• Rising CapEx with stagnant revenue and utilization
• Borrowings and interest expense rising together
• No visible FCF improvement even after growth investment ends

What matters more than the current sign of FCF is why it is negative and whether it can normalize..

3-7. FCF is also affected by temporary working-capital effects

FCF may improve temporarily because of:

• Large inventory reductions
• Collection of receivables
• Delayed supplier payments
• Increase in customer advances
• Postponed CapEx spending

Conversely, FCF may deteriorate temporarily because of:

• Inventory building ahead of a product launch
• Changes in customer payment terms
• One-time tax payments
• Initial working-capital investment for a major project
• Equipment payments concentrated at year-end

Look beyond a single quarter's FCF and consider:

• The latest 4 quarters combined, or LTM FCF
• Average FCF over 3–5 years
• The trend over 8–20 quarters
• Normalized FCF excluding working-capital effects
• Expected FCF after the CapEx cycle ends

3-8. FCF margin and FCF yield

FCF Margin

Shows how much revenue remains as FCF.

\[FCF\ Margin=\frac{FCF}{\text{Revenue}}\times100\]

If FCF margin keeps falling despite revenue growth, growth may require substantial working capital and CapEx, or cash-generation efficiency may be weakening.

FCF Yield

Shows FCF generation relative to current market capitalization.

\[FCF\ Yield=\frac{FCF}{\text{Market capitalization}}\times100\]

A higher FCF yield may indicate a relatively cheaper stock, all else equal.

However, a high FCF yield can reflect:

• Actual undervaluation
• Concerns about falling future FCF
• Abnormally high FCF at a cyclical peak
• Short-term FCF boosted by reduced investment
• Structural business decline
• High debt and financial risk

Do not use FCF yield alone. Consider growth, returns on capital, debt and the sustainability of FCF together.

3-9. Simple FCF versus FCFF and FCFE

Today's basic formula is:

\[\text{Simple FCF}=OCF-CapEx\]

Professional valuation distinguishes cash flows according to their purpose.

FCFF: Cash flow available to the whole firm

FCFF (Free Cash Flow to Firm) is cash flow available to both creditors and shareholders.

\[FCFF=EBIT\times(1-\text{Tax rate})+\text{Depreciation}-CapEx-\Delta\text{Working capital}\]

Discounting FCFF at WACC gives enterprise value (EV).

FCFE: Cash flow available to common shareholders

\[FCFE=\text{Net income}+\text{Non-cash expenses}-CapEx-\Delta\text{Working capital}+\text{Net borrowing}\]

Discounting FCFE at the cost of equity gives equity value.

At this stage, remembering the following distinctions is more important than detailed DCF calculations.

• FCFF → Value of the whole firm
• FCFE → Equity value
• Company-reported simple FCF → Usually OCF − CapEx, but check each company's definition

3-10. FCF in companies with substantial stock-based compensation

Stock-based compensation is an expense in net income but is added back in OCF because it does not directly use cash. Companies with large stock-based compensation expenses can therefore appear to have strong FCF.

But ongoing issuance of new shares dilutes existing shareholders. If the company repurchases shares to offset dilution, cash actually flows out.

For software and platform companies, examine:

• Stock-based compensation
• Growth in diluted share count
• Share repurchase spending
• Actual change in outstanding shares after buybacks
• Conservative FCF after deducting stock-based compensation

Being non-cash does not mean stock-based compensation is not an economic cost.

4. A simple numerical example

The following figures for AI infrastructure company A are hypothetical annual educational figures. for manufacturing company A. Monetary amounts are in KRW 100 million units.

① Disclosure-based simple FCF

\[FCF=500-400=100\text{ (KRW 100m)}\]

② FCF Margin

\[ FCF\ Margin =100\div3,000\times100 =3.3\% \]

③ FCF Yield

\[ FCF\ Yield =100\div5,000\times100 =2.0\% \]

After reflecting all actual current investment spending, FCF yield is 2%.

④ Cash after maintenance investment in the existing business

\[OCF-\text{Maintenance CapEx}=500-150=350\text{ (KRW 100m)}\]

This estimates the existing business's cash-generating capacity assuming no growth investment. It is not the same as actual FCF of 100 (KRW 100 million units).

⑤ Assessing growth investment

Under a simple assumption that growth CapEx of 250 produces additional stable annual OCF of 80 (units: KRW 100 million), the estimated cash return on the investment is:

\[\text{Estimated cash return}=80\div250\times100=32\%\]

If 32% is sustainable and comfortably exceeds the risk-adjusted cost of capital, low current FCF can be interpreted as the result of investment for future growth.

Conversely, if additional OCF is only 10 (KRW 100 million units):

\[ 10\div250\times100=4\% \]

If the cost of capital exceeds 4%, the growth investment may destroy enterprise value.

5. Practical use in stock and company analysis

① Fix the definition before calculating FCF

State the definition at the top of the analysis table, for example:

FCF = Consolidated operating cash flow − Purchases of tangible assets

If you also deduct intangible asset purchases or lease-related payments, disclose that too. Maintain consistent definitions across a company's history and between companies.

② Examine a trend covering at least 8 quarters

Arrange the following items side by side for each quarter.

Looking at 8~20 quarters rather than a single quarter makes it easier to distinguish industry conditions, investment cycles and working capital fluctuations.

③ Break down the reasons for lower FCF into three categories

\[ \text{FCF decline} \Rightarrow \begin{cases} \text{Lower OCF}\\ \text{Higher CapEx}\\ \text{Lower OCF}+\text{Higher CapEx} \end{cases} \]

• Lower OCF: Potential profitability or working capital problems
• Higher CapEx: Potential growth investment or maintenance investment burden
• Both deteriorate: Operating and investment burdens increase together

④ Verify the basis for growth CapEx

Check whether the following evidence is available.

• Long-term contracts
• Order backlog and RPO
• Insufficient production capacity
• Customer advances
• High utilization
• Higher prices or strong demand
• Investment completion and revenue generation dates
• Expected return on investment

Take a conservative view if the explanation is limited to vague statements such as “meeting AI demand” or “preparing for future growth,” without details on customers, capacity, timelines or the revenue model.

⑤ Consider FCF alongside borrowings

The following ratio provides a simple check of debt repayment capacity.

\[ \text{Net debt}/FCF =\frac{\text{Net debt}}{\text{Annual FCF}} \]

However, this ratio is not useful when FCF is small or negative. In that case, also examine net debt/EBITDA, interest coverage, the maturity profile and cash balances.

⑥ Check whether shareholder returns are covered by FCF

\[ \text{Shareholder payout ratio} = \frac{\text{Dividends}+\text{Share repurchases}}{FCF} \]

• 100% or below: returns may be funded within current FCF
• Above 100%: cash reserves or additional borrowing may have been used

Compare cumulative FCF and cumulative shareholder returns over several years, rather than a single year.

⑦ Estimate normalized FCF rather than focusing only on current FCF

For capital-intensive growth companies, it is useful to distinguish the following scenarios.

Share prices may respond more strongly to the market's expected future normalized FCF than to current FCF.

6. What to look for in disclosures

Korean companies: DART

Financial Supervisory Service DART Check the following items there.

FCF is often not an official line item in DART's standard financial statements and therefore must be calculated directly.

Always record the following when calculating it.

• Consolidated or standalone basis
• Reporting period
• Standalone quarter or cumulative period
• CapEx definition
• Unit
• Distinction between disclosed figures and analyst calculations

US companies: 10-K and 10-Q

SEC EDGAR: check the following items.

• Consolidated Statements of Cash Flows
• Net cash provided by operating activities
• Purchases of property and equipment
• Capital expenditures
• Property and equipment
• Commitments and contingencies
• Liquidity and Capital Resources
• Contractual obligations
• In the earnings materials, Non-GAAP reconciliation

FCF reported by US companies is often a company-defined non-GAAP measure. Always check the following.

• FCF formula
• Scope of total CapEx
• Whether finance and equipment leases are included
• Whether intangible asset purchases are included
• Whether restructuring and acquisition-related spending is adjusted
• Treatment of stock-based compensation
• Difference between the company-reported figure and your own calculation

When displaying official disclosures and analyst estimates in the same table, distinguish them as follows.

• R: Company-disclosed figures (Reported)
• C: Values calculated directly from disclosed figures (Calculated)
• E: Analyst estimates (Estimated)

7. Key takeaways

• Simple FCF is generally calculated as OCF－CapEx is the calculation used.
• Even with substantial OCF, FCF can be small or negative if CapEx is larger.
• Maintenance CapEx sustains the existing business, while growth CapEx aims to expand future revenue and cash flow.
• Maintenance and growth CapEx are often not clearly separated in disclosures and must be estimated using management explanations, production capacity, construction in progress, depreciation and other information.
• Negative FCF caused by growth investment is not necessarily bad, but the investment return and future cash generation must be verified.
• The 8~20-quarter trend, LTM FCF and normalized FCF matter more than a single quarter's FCF.
• A high FCF Yield may reflect expected future FCF declines or structural underinvestment, so it should not be used alone to determine undervaluation.
• Stock-based compensation is a non-cash expense, but dilution can create an economic cost for existing shareholders.
• Always check whether company-reported FCF and your own FCF calculation use the same definition.

8. Three review questions

Question 1

If operating cash flow is 800 and purchases of property, plant and equipment are 500 (all amounts in KRW 100m), calculate simple FCF and FCF Margin. Revenue is 4,000.

Question 2

A company has total CapEx of 600, comprising estimated maintenance CapEx of 200 and growth CapEx of 400 (all amounts in KRW 100m). If OCF is 750, calculate actual simple FCF and the existing business's cash capacity after maintenance investment, respectively.

Question 3

Two companies both have current FCF of 100 (KRW 100m).

• Company A: OCF 500, CapEx 400 (KRW 100m). It is building a new production line backed by long-term contracts.
• Company B: OCF 150, CapEx 50 (KRW 100m). Revenue and OCF have declined for 3 consecutive years, and equipment replacement is also being deferred.

Which company is relatively more likely to see its future FCF improve?

Answers and explanations

Answer 1

\[ FCF=800-500=300\text{ (KRW 100m)} \]

\[ FCF\ Margin =300\div4,000\times100 =7.5\% \]

Answer 2

Simple FCF reflecting actual total CapEx is as follows.

\[ \text{Simple FCF}=750-600=150\text{ (KRW 100m)} \]

The existing business's cash capacity after deducting only maintenance investment is as follows.

\[ \text{Existing business cash capacity}=750-200=550\text{ (KRW 100m)} \]

The 550 (KRW 100m) is not actual remaining FCF, but an analytical estimate assuming no growth investment.

Answer 3

Based only on the information provided, Company A is relatively more likely to see its future FCF improve. Current FCF is low because of growth CapEx backed by long-term contracts. Once the production line starts operating and CapEx normalizes, OCF and FCF may increase.

Company B has the same current FCF, but its revenue and OCF are declining, and even essential equipment replacement is being deferred. Current FCF may be inflated by reduced maintenance investment.

However, Company A also faces risks of investment delays, cost overruns, customer contract cancellations and weaker demand, so check its investment completion schedule and expected incremental OCF.

Next lesson — Day 7:
“How the Three Financial Statements Connect — Movements in Net Income, Retained Earnings, Cash and Borrowings”