The same $150 million profit can produce several different return figures. For Harbor Coffee, our fictional coffee business, the next question is how much it earns on all the resources it uses.
Return on equity compares profit with the owners' stake. You also want to see the resources funded by lenders and suppliers. A business that needs twice as much capital for the same profit earns half as much per dollar. ROA and ROIC widen the view beyond equity.
Start with the assets
Return on assets (ROA) is net income divided by average total assets: the resources recorded on the balance sheet.
Harbor's reported assets start FY3 at $968.4 million and end at $1,000.4 million. Their average is (968.4 + 1,000.4) ÷ 2 = $984.4 million.
Divide its $150 million net income by that base: 150 ÷ 984.4 × 100% = 15.24%. Harbor earns $15.24 of net profit per $100 of average assets, using the same averaging method as ROE.
ROA still reflects borrowing costs because net income is after interest. Switching from equity to assets does not remove financing from the answer. The profit measure must change too.
Focus on operating capital
Return on invested capital (ROIC) compares after-tax operating profit with the capital supplied by lenders and owners for operations.
Net operating profit after tax (NOPAT) is operating profit with tax applied, before financing costs. Harbor reports $220 million of operating profit. Applying the cast's 25% tax rate leaves $220 million × 0.75 = $165 million. The tax calculation treats Harbor as though it had no interest deduction.
Invested capital is funding committed to operations, measured at book value. Here we use interest-bearing debt + equity − all cash, then average the start and end balances. Debt means borrowings; unpaid supplier bills are excluded from this funding base.
Using Harbor's reported balances, in millions of dollars:
- Start of FY3: $300 debt + $514.4 equity − $105.4 cash = $709.
- End of FY3: $300 debt + $544.4 equity − $105.4 cash = $739.
- Average: ($709 + $739) ÷ 2 = $724.
Harbor's ROIC is 165 ÷ 724 × 100% = 22.79%. Each $100 of average invested capital earns $22.79 of after-tax operating profit in FY3.
Harbor FY3: reported net income and calculated NOPAT, averages and returns; dollar amounts in millions.
| Measure | Profit | Avg. base | Return |
|---|---|---|---|
| ROA | 150 | 984.4 | 15.24% |
| ROIC | 165 | 724 | 22.79% |
ROIC changes both halves of the fraction. The higher percentage here comes from more profit in the numerator and less capital in the denominator, without any change in Harbor's operations.
What return is high enough?
Owners' money has a cost even when no interest bill arrives: they could invest elsewhere. The cost of capital is the return lenders and owners require for investments of comparable risk. It includes more than loan interest and is an estimate, not a promised payment.
Suppose Harbor's hurdle is 9% a year. Its ROIC spread, the difference between ROIC and that hurdle, is 22.79% − 9% = 13.79 percentage points. The gap on the scale shows how far its operating return clears the hurdle.
On these numbers, Harbor's FY3 operations pass the value-creation test: they earn more than the required return. If its ROIC were only 6%, it could still report a profit while falling short of the 9% hurdle. Profit alone is too low a bar.
A productive business can still be an expensive stock. Neither ratio includes the price you pay for its shares. If you want to estimate the hurdle, the discount-rate lesson explains how required returns are built.
Use comparisons carefully
Harbor's ROIC holds near 23% across FY1–FY3: 22.57%, 22.69% and 22.79%, using the same method. Three steady years show consistency, not a permanent advantage. Economic moats asks what could protect those returns from competitors.
Start with a company's own history, then compare similar businesses using consistent definitions and periods. Our fictional Ironvale Steel needs furnaces and heavy equipment. A lower return than a software company earns need not mean worse management. A steel mill cannot run on code alone.
Banks need a different approach. Borrowing and taking deposits are part of their operating business. For fictional Copperfield Bank, use ROE alongside price-to-book instead of applying this industrial ROIC template.
Accounting can bend the answer
Recorded capital can shrink while a business keeps working. Depreciation reduces the book value of aging equipment; write-downs reduce it further. If later profits hold steady, a smaller denominator lifts the return without better operations. An old factory can look more productive on paper simply because less of its cost remains on the books.
Software development can be expensed as work happens, leaving no matching asset on the balance sheet. That reduces profit immediately and leaves less recorded capital for later profits to be measured against. A high ratio can begin with a small denominator.
Historical ROIC describes past investments. A new factory or product line may earn a different return.
Next, DuPont analysis brings assets and equity together to explain how profit margins, asset use and financing produce Harbor's ROE.
In short
- ROA measures net income against average total assets; borrowing costs still affect it.
- ROIC pairs after-tax operating profit with average capital committed to operations.
- Judge ROIC against the cost of capital: a positive profit can still fall short.
- Check what is in the denominator before ranking businesses by their returns.
- A productive business can still be an expensive stock.