Investment base and calculation issues for ROI and RI
The learning outcome statements relevant for this section are:
- explain how revenue and expense recognition policies may affect the measurement of income and reduce comparability among business units
- explain how inventory measurement policies, joint asset sharing, and overall asset measurement policies may affect the measurement of investment and reduce comparability among business units
Recall from the previous chapter, Return on investment (ROI) and Residual Income (RI), that both measures depend on operating income and the investment base - the policy choices behind those two inputs are what this chapter covers.
Net income calculation issues for ROI and RI
There is no universal standard for which income amount should be used in ROI and RI calculations. The choice typically depends on the purpose of the analysis. For segment evaluation, operating income is often used because it excludes financing costs and taxes, which division managers typically don’t control; some organizations go further and also exclude allocated common costs, producing a controllable margin. However, net income is also acceptable, especially when the focus is on overall profitability. The CMA Exam will normally make it clear which income base to use for calculations, ensuring clarity for candidates.
Using net income introduces potential issues because it may include non-recurring items, such as one-time gains, losses, or restructuring costs. These items can distort the true profitability of a segment and make comparisons across business units less meaningful. Excluding such items when calculating ROI or RI can provide a clearer picture of ongoing performance.
Different revenue and expense recognition policies also make it difficult to compare ROI and RI across business units. For example, a division recognizing long-term contract revenue over time reports income earlier than one that waits until delivery, and a division capitalizing costs like software development instead of expensing them reports higher income and a larger asset base. Higher depreciation from recent capital investments or differing cost-allocation methods can further skew comparisons.
To address these issues, organizations should standardize revenue and expense recognition policies or adjust calculations to account for such differences. By doing so, ROI and RI become more reliable tools for performance evaluation and strategic decision-making.
Investment base calculation issues for ROI and RI
The investment base plays a crucial role in both return on investment (ROI) and residual income (RI) calculations:
- For ROI, the investment base serves as the denominator, directly influencing the percentage outcome of the calculation.
- In RI, the investment base is used to calculate the required return, which is then deducted from operating income to determine the residual amount.
As a result, inconsistencies in defining or measuring the investment base can significantly impact the comparability and fairness of ROI and RI across divisions. Determining an appropriate and consistent investment base is critical for ensuring accurate and comparable performance evaluations across divisions.
The following areas present significant challenges:
- Inventory measurement policies
- Joint asset sharing
- Overall asset measurement policies
1. Inventory measurement policies
Divisions may use different inventory valuation methods, such as FIFO, LIFO, or weighted average cost, which can result in variations in both the reported investment base and reported income. When costs are rising, LIFO assigns the newest, highest costs to cost of goods sold, which lowers both the inventory value in the investment base and reported operating income. FIFO does the opposite: it leaves the newest, highest costs in ending inventory, which raises both the investment base and reported income. Because LIFO and FIFO move the numerator and denominator of ROI in the same direction, the net effect on ROI depends on which effect is larger - ROI isn’t automatically higher or lower under either method. Either way, divisions using different inventory methods aren’t directly comparable unless the figures are adjusted to a common method.
2. Joint asset sharing
Shared assets, such as centralized IT systems, warehouses, or equipment used by multiple divisions, complicate the allocation of investment base values. If a shared asset is fully allocated to one division, it may unfairly inflate that division’s investment base while understating it for others. This can distort ROI and RI calculations, either penalizing or overstating the performance of specific divisions. To ensure comparability, organizations should use a fair and consistent method for allocating the value of shared assets, such as usage-based or time-based allocation.
3. Overall asset measurement policies
Policies governing how assets are measured and reported can further affect the investment base. Three bases are especially common, and they can produce very different results:
- Net book value (cost minus accumulated depreciation) shrinks as assets age, inflating ROI and RI without any real improvement in performance, and can discourage replacing old equipment.
- Gross book value (original cost, before depreciation) avoids that effect but still reflects old prices rather than current ones.
- Current or replacement cost reflects today’s prices, giving a larger base and a lower ROI when prices are rising.
Divisions must also agree on what belongs in the base: total assets, operating assets (excluding idle assets or construction in progress), or net assets (total assets minus current liabilities). Average balances are preferred over ending balances, since income is earned across the whole period. Intangibles like goodwill can further skew results if included inconsistently, so comparisons only work when every division defines the base the same way.
Example: Gross book value vs. net book value
A division reports operating income of $120,000. Its only asset is equipment with a gross cost of $1,000,000 and accumulated depreciation of $400,000; the required rate of return is 10%.
Gross book value basis:
Net book value basis ($1,000,000 - $400,000 = $600,000):
Answer: Operating income didn’t change, only the measurement basis did - yet ROI rises from 12% to 20% and RI from $20,000 to $60,000, so divisions on different asset bases aren’t directly comparable.