Daily study of economics, management, and finance
September 28, 2026 (KST) · Day 8
Today's topic: How much do good companies earn on invested capital? — Understanding and calculating ROIC
1. Review of the previous lesson
Day 7 covered how net income, depreciation, working capital, CapEx, and borrowings connect the income statement, balance sheet, and cash flow statement. Today, we use these connected statements to measure how efficiently a company generates profit from capital committed to operations, using ROIC as the measure.
2. Today's key concept
ROIC (Return on Invested Capital) measures how much after-tax operating profit a company generates from capital committed to its operations.
\[ ROIC = \frac{NOPAT}{\text{Average invested capital}} \times100 \]
- NOPAT: After-tax operating profit excluding the effects of financing choices
- Invested capital: Capital actually committed to running the core business
- Average invested capital: Usually the average of beginning and ending invested capital
A higher ROIC means generating more operating profit from the same capital. However, for a high ROIC to increase company value, at a minimum ROIC must exceed WACC, the company's cost of capital.
\[ ROIC>WACC \quad\Rightarrow\quad \text{Potential economic value creation} \]
3. Concept explained
3-1. Why use NOPAT rather than net income or ROE?
Net income is profit after interest expense. It therefore reflects both how well a company operates its business and how much debt it uses.
ROIC evaluates returns on capital provided jointly by shareholders and creditors, so the profit in its numerator must likewise be based on operating profit before interest expense.
The basic NOPAT calculation is:
\[ NOPAT = \text{Operating profit}\times(1-\text{Tax rate}) \]
For example, if operating profit is KRW 200 hundred million and the applicable tax rate is 25%:
\[ NOPAT = 200\times(1-25\%) = 150\text{ hundred million KRW} \]
NOPAT often does not appear as a formal line item in published financial statements. Analysts calculate it using operating profit and a tax rate.
Which tax rate should you use?
For a basic analysis, consistently use one of the following:
- Statutory tax rate
- Effective tax rate calculated from the income statement
- Normalized tax rate excluding one-time tax effects
- The company's disclosed expected long-term tax rate
The effective tax rate can be calculated as follows:
\[ \text{Effective tax rate} = \frac{\text{Income tax expense}}{\text{Income before tax}} \]
However, overseas subsidiaries, tax credits, deferred taxes, and one-time assessments or refunds can cause a particular year's effective tax rate to fluctuate substantially. Analysts therefore often use a multiyear average or normalized tax rate.
3-2. What is invested capital?
Invested capital is the capital that shareholders and creditors provide to operate a company's core business.
There are two main ways to calculate invested capital.
Method 1: Subtract operating liabilities from operating assets
\[ \text{Invested capital} = \text{Operating assets}-\text{Non-interest-bearing operating liabilities} \]
Operating assets generally include:
- Accounts receivable
- Inventory
- Property, plant, and equipment
- Intangible assets used in operations
- Other operating assets
Non-interest-bearing operating liabilities generally include:
- Accounts payable
- Accrued expenses
- Contract liabilities
- Customer advances
- Other operating liabilities
As a rule, include only the minimum cash required for operations and exclude excess cash that is unnecessary for running the business.
Method 2: Calculate from the financing side
In simplified form:
\[ \text{Invested capital} = \text{Interest-bearing debt} +\text{Shareholders' equity} -\text{Excess cash} -\text{Non-operating financial assets} \]
In theory, both methods should give similar results if classifications and adjustments are applied consistently.
In actual filings, however, results may differ depending on how the following items are treated:
- Lease liabilities and right-of-use assets
- Goodwill
- Investments in associates
- Pension liabilities
- Construction in progress
- Assets held for sale
- Restricted cash
- Non-controlling interests
- Capitalized research and development costs
When comparing ROIC, therefore, check that the same definition of invested capital is applied to each company and verify consistency.
3-3. Why use average rather than ending invested capital?
NOPAT is a flow earned over a period, while invested capital on the balance sheet is a point-in-time balance.
To match capital with period earnings, analysts generally use the average of beginning and ending invested capital.
\[ \text{Average invested capital} = \frac{\text{Beginning invested capital}+\text{Ending invested capital}}{2} \]
For example, if beginning invested capital is KRW 700 hundred million and ending invested capital is KRW 900 hundred million:
\[ \text{Average invested capital} = (700+900)\div2 = 800\text{ hundred million KRW} \]
If a major acquisition or capacity expansion occurs at a particular point during the year, a simple average may not accurately reflect how long capital was employed. Quarterly or monthly averages can be more accurate in this case.
3-4. How do ROIC and ROE differ?
\[ ROE = \frac{\text{Net income attributable to controlling shareholders}}{\text{Average equity}} \]
\[ ROIC = \frac{NOPAT}{\text{Average invested capital}} \]
| Category | ROE | ROIC |
|---|---|---|
| Capital evaluated | Shareholders' equity | Shareholders' equity and interest-bearing debt |
| Profit measure | Net income | After-tax operating profit |
| Effect of debt | Significantly affected by interest expense and leverage | Relatively less affected by capital structure |
| Benchmark | Cost of equity | WACC |
| Primary use | Profitability of shareholders' capital | Efficiency of core operations and total invested capital |
Using more debt can reduce equity and increase ROE. However, a debt-driven increase in ROE does not mean the core business has become more competitive.
For example, two companies may have identical operating performance, but the one using more debt can have a higher ROE. ROIC aims to reduce these financing differences and assess how efficiently the business itself uses invested capital as its focus.
3-5. Why is high ROIC favorable for company value?
Companies raise capital from creditors and shareholders. These capital providers demand a return for bearing risk, and WACC is the weighted average of those required returns.
ROIC 15%, WACC 9%
→ Earns a return 6 percentage points above the cost of capitalROIC 6%, WACC 9%
→ Fails to meet capital providers' required return despite reporting accounting profit
The difference between ROIC and WACC is called the ROIC spread.
\[ ROIC\ Spread=ROIC-WACC \]
A simplified monetary measure of economic profit is:
\[ \text{Economic profit} = NOPAT-(\text{Average invested capital}\times WACC) \]
Equivalently:
\[ \text{Economic profit} = (ROIC-WACC)\times \text{Average invested capital} \]
WACC is an estimate that varies with market interest rates, share-price volatility, borrowing costs, and capital structure. We will cover its calculation in the next lesson.
3-6. ROIC can be decomposed into margin and capital turnover
The following decomposition helps explain why ROIC is high:
\[ ROIC = NOPAT\ Margin \times \text{Invested capital turnover} \]
\[ NOPAT\ Margin = \frac{NOPAT}{\text{Revenue}} \]
\[ \text{Invested capital turnover} = \frac{\text{Revenue}}{\text{Average invested capital}} \]
A company can therefore achieve high ROIC in two ways:
- High margins: Earn more profit per KRW 1 of revenue
- High capital turnover: Generate substantial revenue with little capital
| Business type | NOPAT margin | Capital turnover | Source of ROIC |
|---|---|---|---|
| Software and platforms | Generally high | Varies by business | High margins and limited tangible-asset requirements |
| Retail and discount stores | Generally low | Generally high | Fast inventory turnover and supplier credit |
| Semiconductors and telecommunications | Varies across the cycle | Can be low | Utilization and pricing of large facilities |
| Luxury and branded companies | Generally high | Moderate | Pricing power and brand strength |
| Airlines and shipping | Highly volatile | Capital-intensive | Affected by freight rates/fares and capacity utilization |
Because business structures differ across industries, it is safer to compare ROIC within the same industry and under similar accounting policies.
3-7. Growth does not always create value
Even when revenue and profit rise, shareholder value may not increase if achieving that growth requires excessive capital investment.
Additional investment by a company whose ROIC exceeds WACC
→ Investment may increase valueAdditional investment by a company whose ROIC is below WACC
→ Scale may increase while economic value is destroyed
Good growth must therefore satisfy both of the following conditions:
\[ ①\ ROIC>WACC \]
\[ \text{② Opportunities exist to reinvest at high ROIC} \]
Even with very high ROIC, a company without reinvestment opportunities may be better off returning surplus cash through dividends or buybacks. Conversely, companies that can reinvest for many years while maintaining high ROIC have significant compounding potential.
3-8. High ROIC does not always last
High ROIC can attract competitors. Greater competition may reduce ROIC through price cuts, higher marketing and labor costs, or additional CapEx.
Sustaining high ROIC requires competitive advantages such as:
- Brand strength and pricing power
- Network effects
- Economies of scale
- Switching costs
- Patents, technology, and data
- Distribution networks
- Cost advantages
- Regulatory barriers to entry
- Recurring revenue and high customer retention
Analysis should therefore go beyond asking whether current ROIC is high and ask:
Why does this company earn high ROIC, and can those underlying drivers persist?
4. A simple numerical example
The following are manufacturer A's hypothetical annual figures for this lesson. Amounts are in KRW hundred million.
① Calculate NOPAT
| Item | Amount |
|---|---|
| Revenue | 1,000 |
| Operating profit | 150 |
| Normalized tax rate | 25% |
| NOPAT | 112.5 |
\[ NOPAT = 150\times(1-25\%) = 112.5\text{ hundred million KRW} \]
② Calculate average invested capital
| Item | Beginning | Ending |
|---|---|---|
| Operating assets | 1,000 | 1,100 |
| Non-interest-bearing operating liabilities | 300 | 300 |
| Invested capital | 700 | 800 |
\[ \text{Beginning invested capital} = 1,000-300 = 700\text{ hundred million KRW} \]
\[ \text{Ending invested capital} = 1,100-300 = 800\text{ hundred million KRW} \]
\[ \text{Average invested capital} = (700+800)\div2 = 750\text{ hundred million KRW} \]
③ Calculate ROIC
\[ ROIC = 112.5\div750\times100 = 15\% \]
Company A generated KRW 15 of after-tax operating profit for every KRW 100 of capital invested in operations, on average.
④ Decompose into margin and capital turnover
\[ NOPAT\ Margin = 112.5\div1,000 = 11.25\% \]
\[ \text{Invested capital turnover} = 1,000\div750 = 1.33\text{ times} \]
\[ ROIC = 11.25\%\times1.33 \approx15\% \]
Company A's 15% ROIC therefore reflects retaining 11.25% of revenue as NOPAT and converting average invested capital into revenue approximately 1.33 times per year.
⑤ Compare with WACC
Since we have not yet learned to calculate WACC, assume a **hypothetical 9% WACC** for company A in this example.
\[ ROIC\ Spread = 15\%-9\% = 6\%p \]
\[ \text{Economic profit} = (15\%-9\%)\times750 = 45\text{ hundred million KRW} \]
In this hypothetical calculation, company A generates KRW 45 hundred million of annual economic profit after meeting capital providers' required return.
Separately assess whether the 15% ROIC reflects a one-time boom or a low opening asset base, and whether it can be sustained.
5. Practical use in stock and company analysis
① Examine a trend of at least 5 years
A single year's ROIC can vary significantly with the economic cycle, exchange rates, asset sales, one-time expenses, and capacity utilization.
Compare multiple years, as follows:
| ROIC trend | Possible interpretation |
|---|---|
| High and stable | Potential sustainable competitive advantage |
| Consistently rising | Improving margins or asset efficiency, or investments beginning to pay off |
| Consistently falling | Possible intensifying competition, overinvestment, or weakening pricing power |
| Sharp swings across cycles | May indicate a cyclical industry |
| Sharp decline after acquisition | Possible excessive purchase price or poor acquired-business performance |
For cyclical companies, peak-boom ROIC can greatly exceed normal levels. Examine average ROIC over a full cycle rather than a single year.
② Decompose the causes of higher ROIC into two drivers
\[ ROIC = NOPAT\ Margin \times \text{Invested capital turnover} \]
If ROIC rises, distinguish the following:
- Higher margins: Price increases, better product mix, lower costs, economies of scale
- Higher capital turnover: Lower inventory, better receivables collection, higher capacity utilization
- Smaller denominator: Asset sales, impairment charges, reduced investment
- One-time effects: Lower tax rates, provision reversals, one-off high-margin sales
Asset impairments, in particular, can reduce book invested capital and raise subsequent ROIC. This may reflect accounting recognition of past investment failures rather than improved competitiveness.
③ Assess high ROIC together with growth
Company types can be simplified as follows:
| ROIC | Reinvestment opportunities | Interpretation |
|---|---|---|
| High | Many | Potential for compound growth at high returns |
| High | Few | Strong cash generation but limited growth; shareholder returns matter |
| Low | Many | Growth may destroy value |
| Low | Few | Business downsizing, restructuring, or better capital allocation may be needed |
High revenue growth alone does not make a good investment. Check the return on incremental capital required to support growth.
Over the long term, the return on newly invested capital, or incremental ROIC, is often more important than historical ROIC on total invested capital.
\[ \text{Incremental ROIC} \approx \frac{\text{Increase in NOPAT}}{\text{Increase in invested capital}} \]
For example, if invested capital rises by KRW 200 hundred million but NOPAT rises by only KRW 5 hundred million, incremental ROIC is 2.5%. Recent investment efficiency may deteriorate despite a high historical average ROIC.
④ High ROIC does not mean a stock is cheap
ROIC shows business quality and capital efficiency; it does not directly measure whether shares are undervalued.
- A high-ROIC company can be overvalued if its share price incorporates excessive growth expectations.
- A low-ROIC company can offer an investment opportunity if potential restructuring and improved asset efficiency are not fully priced in.
- A high valuation is difficult to justify if high ROIC will last only briefly.
Investment decisions therefore require considering both:
\[ \text{Business quality}\;(ROIC,\ \text{Growth},\ \text{Competitive advantage}) + \text{Price}\;(PER,\ EV/EBITDA,\ FCF\ Yield) \]
⑤ Standardize calculation methods across companies
Analysts may calculate ROIC differently. Before comparing companies, standardize the following:
- Definition of operating profit
- Applicable tax rate
- Whether beginning and ending balances are averaged
- Criteria for excluding excess cash
- Whether lease liabilities are included
- Whether goodwill is included
- Whether investments in associates are excluded
- Consolidated or separate financial statements
- Last 12 months or the same fiscal year
- Whether one-time gains and losses are adjusted
ROIC definitions can differ even within the same data service, so check the formula rather than simply comparing figures.
⑥ Standard ROIC is difficult to apply to financial companies
For banks, insurers, and securities firms, liabilities and financial assets are central to operations. Unlike ordinary manufacturers, they cannot easily separate operating from financial liabilities or operating from excess cash.
The following measures are more commonly used than ROIC for financial companies:
- ROE
- Return on tangible equity
- Net interest margin
- Capital adequacy
- Credit cost ratio
- Insurance contractual service margin and investment returns
Do not apply the standard nonfinancial-company ROIC formula directly to banks.
6. What to look for in filings
ROIC is often not disclosed directly, so gather inputs from multiple statements and notes and calculate it yourself.
Korean companies: DART
The Financial Supervisory Service's DART annual, half-year, and quarterly reports should be reviewed, with consolidated financial statements prioritized for review.
| Location in filings | Inputs needed to calculate ROIC |
|---|---|
| Consolidated statement of comprehensive income | Operating profit, income before tax, income tax expense |
| Consolidated balance sheet | Cash, receivables, inventory, property, plant and equipment, intangibles, payables, borrowings, and equity |
| Income tax notes | Statutory and effective tax rates, tax credits, one-time tax effects |
| Operating segment notes | Revenue, profit, and assets by segment |
| Cash notes | Restricted cash and short-term financial instruments |
| Receivables and inventory notes | Operating working capital composition and impairment |
| Property, plant, and equipment notes | Acquisitions, depreciation, disposals, impairment, construction in progress |
| Intangible assets and goodwill notes | Acquired assets, amortization, impairment charges |
| Borrowings and bonds notes | Scope of interest-bearing debt |
| Lease notes | Right-of-use assets and lease liabilities |
| Business combination notes | Goodwill, assets, and liabilities added through acquisitions |
| Statement of changes in equity | Changes in equity from beginning to end of period |
The basic calculation steps are:
- Identify consolidated operating profit.
- Apply a normalized tax rate to calculate NOPAT.
- Add up operating assets at the beginning and end of the period.
- Subtract non-interest-bearing operating liabilities such as accounts payable and accrued expenses.
- Exclude excess cash and non-operating financial assets.
- Average beginning and ending invested capital.
- Divide NOPAT by average invested capital.
When calculating ROIC from quarterly results, do not compare a single quarter's operating profit directly with annual invested capital. Use the latest 4 quarters' cumulative LTM operating profit or apply a reasonable annualization method.
US companies: 10-K and 10-Q
SEC EDGAR for the following items.
- 10-K:
Item 8. Financial Statements and Supplementary Data - 10-Q:
Part I, Item 1. Financial Statements Consolidated Statements of OperationsConsolidated Balance SheetsIncome TaxesProperty, Plant and EquipmentGoodwill and Intangible AssetsDebtLeasesBusiness CombinationsSegment Information
US filings typically label operating profit as Operating income and income tax expense as Provision for income taxes or similar terms.
Even when company investor relations materials report ROIC, Adjusted ROIC, Return on capital, check the following:
- The company's definition of NOPAT
- Whether one-time expenses are excluded
- Treatment of restructuring and stock-based compensation costs
- Whether goodwill is included
- Whether lease liabilities are included
- Whether average or ending invested capital is used
- Reconciliation of GAAP and adjusted figures
ROIC itself may be a calculation applying analysts' definitions and adjustments to disclosed figures rather than a directly disclosed fact. It is therefore helpful to distinguish the following in an analysis table:
- R(Reported): Figures disclosed by the company
- C(Calculated): Values calculated directly from disclosed figures
- E(Estimated): Analyst estimates
7. Key takeaways
- ROIC shows how much after-tax operating profit a company generates from capital committed to operations.
- The basic formula is
NOPAT ÷ Average invested capital. - NOPAT is generally calculated as
Operating profit × (1 − Normalized tax rate)using this formula. - Invested capital is calculated by subtracting non-interest-bearing operating liabilities from operating assets, or excess cash and non-operating assets from debt plus equity.
- Beginning and ending invested capital are generally averaged to match period earnings with point-in-time balances.
- ROIC can be decomposed into
NOPAT margin × Invested capital turnoverto analyze profitability and capital efficiency together. - ROIC above WACC suggests potential economic value creation, but both measures require normalization and consistent calculation.
- High ROIC combined with abundant reinvestment opportunities increases long-term compounding potential.
- High ROIC does not necessarily mean undervaluation; also assess valuation and sustainable competitive advantages.
- The standard nonfinancial-company ROIC formula is difficult to apply directly to financial companies.
8. 3 review questions
Question 1
If operating profit is KRW 240 hundred million and the normalized tax rate is 25%, what is NOPAT?
Question 2
A company's beginning invested capital is KRW 1,000 hundred million, ending invested capital is KRW 1,200 hundred million, and NOPAT is KRW 132 hundred million. Calculate average invested capital and ROIC.
Question 3
Both companies below have 15% ROIC.
- Company A: WACC of 8%, with ample markets for reinvesting at high ROIC
- Company B: WACC of 12%, with almost no additional investment opportunities in a mature market
Explain why their potential to create company value differs despite identical ROIC.
Answers and explanations
Answer 1
\[ NOPAT = 240\times(1-25\%) = 180\text{ hundred million KRW} \]
This is operating profit less normalized taxes attributable to operations.
Answer 2
\[ \text{Average invested capital} = (1,000+1,200)\div2 = 1,100\text{ hundred million KRW} \]
\[ ROIC = 132\div1,100\times100 = 12\% \]
The company generated KRW 12 of NOPAT per KRW 100 of average invested capital.
Answer 3
Company A's ROIC spread is:
\[ 15\%-8\%=7\%p \]
Company B's ROIC spread is:
\[ 15\%-12\%=3\%p \]
Both companies earn more than their cost of capital, but A earns a larger economic excess return. A also has ample opportunities to reinvest at high ROIC, making long-term compound earnings growth more likely.
B may also generate strong cash flow, but limited additional investment opportunities make capital returns such as dividends and buybacks more important than growth. In practice, also assess how much of these differences is already reflected in the current share price.
Next lesson — Day 9:
“The minimum return a company must exceed — Understanding WACC and the ROIC spread”