Lower of Cost or Market (LCM)
Companies using LIFO or the Retail Inventory Method must use the Lower of Cost or Market (LCM) rule. In this context, "market value" is defined as the current replacement cost. However, to prevent extreme valuation errors, GAAP imposes two constraints on this replacement cost:
- The Ceiling: The NRV serves as the upper limit. Market value should not exceed the NRV to prevent overstating inventory.
- The Floor: The NRV minus a Normal Profit Margin serves as the lower limit. This prevents companies from understating inventory and recognizing excessive losses in the current period, which would artificially inflate future profits.
To find the final "Market Value" for the LCM rule, you identify the replacement cost, the ceiling, and the floor, and then select the middle value of those three numbers.
Recording and Reporting Write-Downs
Once a company determines that a write-down is necessary, it must choose an implementation approach to record the loss.
The Direct Method
Under the direct method, the loss is recorded by increasing Cost of Goods Sold (COGS) and decreasing the Inventory account directly. While simple, the primary disadvantage is that this method can overstate COGS, as it "comingles" the loss with the actual cost of goods sold.
The Allowance Method
The allowance method is conceptually preferred by accountants. Instead of touching the Inventory account directly, the company records the loss in a separate account called Loss on Write-Down of Inventory and uses a contra-inventory account called Allowance to Reduce Inventory to NRV.
This method provides better "representational faithfulness" because it keeps the loss separate from COGS, allowing financial statement users to see exactly how much of the expense was due to actual sales versus how much was due to a loss in value.
Exam Tip: Even though the Direct and Allowance methods result in the same total loss and the same final inventory value on the balance sheet, the Allowance method is superior for financial reporting because it keeps the loss distinct from the cost of goods sold.
Key Accounting Principles
Conservatism
Inventory valuation is guided by the principle of conservatism. This means that accounting rules are applied in only one direction: declines in value are recognized immediately, but increases in value are generally ignored. Once an inventory item is written down, that new, lower value becomes its new "cost basis" for all future periods.
Recovery of Losses
Can a company "undo" a write-down if the value goes back up? Under GAAP, a loss can only be reversed (recovered) within the same fiscal year it was originally recognized. If a loss is recognized in an annual financial statement, it cannot be recovered in a subsequent year.
Exceptions: Valuation Above Cost
While rare, there are specific instances where inventory can be valued above its historical cost. This typically applies to commodities (such as precious metals, oil, gas, or agricultural products) where the items are interchangeable, have immediate marketability at a quoted market price, and it is difficult to determine specific costs. These instances require full disclosure in the financial statements.
Implementation Approaches
When applying these rules, companies must decide how to group their inventory for the calculation. They can choose to apply the valuation rules to:
- Individual Items (the most granular approach)
- Major Categories (e.g., all "shirts" grouped together)
- Total Inventory (the entire inventory pool)
The choice of approach can significantly impact whether a write-down is triggered for specific items versus the whole group.
