7.3 Lower of cost or market rule

Valuation of Inventories

Inventories are often one of the largest assets on a company's balance sheet, so getting their valuation right has a direct impact on reported financial position and income. The core question is straightforward: should you report inventory at what you paid for it, or at what it's currently worth? The lower of cost or market rule gives you the answer.

Cost vs. Market Value

Inventories are initially recorded at historical cost, which includes all costs necessary to bring the inventory to its present location and condition (purchase price, freight, handling, etc.).

Market value represents the current worth of that same inventory. Over time, market value can drift away from historical cost because of changing supplier prices, obsolescence, damage, or shifts in consumer demand. Companies must assess at the end of each reporting period whether market value has fallen below recorded cost.

Lower of Cost or Market Rule

The lower of cost or market (LCM) rule requires companies to report inventory at whichever is lower: historical cost or current market value. This is a direct application of conservatism in accounting. Assets should not be overstated, and potential losses should be recognized when they become apparent rather than deferred until the inventory is sold.

Here's the basic process:

1. Determine the historical cost of the inventory.
2. Determine the current market value (more on this below).
3. Compare the two figures.
4. If market value is lower, write the inventory down to market value and recognize a loss.
5. If cost is lower, no adjustment is needed.

This comparison happens at the end of each reporting period.

Determining Market Value

"Market value" under the LCM rule isn't a single number you look up. It's determined using three related measures, and the relationship between them matters.

Replacement Cost

Replacement cost is the amount a company would currently pay to acquire or reproduce the same inventory item. It reflects today's market conditions for purchasing, not selling.

Think of it this way: if you bought raw steel six months ago at $\$50$ per ton and the same steel now costs $\$42$ per ton from your supplier, the replacement cost is $\$42$.

Net Realizable Value

Net realizable value (NRV) is the estimated selling price of the inventory in the ordinary course of business, minus any estimated costs to complete and sell it.

$\text{NRV} = \text{Estimated Selling Price} - \text{Costs to Complete} - \text{Selling Expenses}$

NRV acts as the ceiling in the LCM framework. Market value cannot exceed NRV, because it would be unreasonable to value inventory above what you actually expect to receive from selling it.

Net Realizable Value Less Normal Profit Margin

This measure subtracts a normal profit margin from NRV:

$\text{NRV less Normal Profit} = \text{NRV} - \text{Normal Profit Margin}$

This figure acts as the floor in the LCM framework. Market value should not fall below this amount, because doing so would recognize more loss than is economically justified.

Putting the Three Together

Under U.S. GAAP's traditional LCM approach, "market" is determined by these steps:

1. Start with replacement cost.
2. Compare it to the ceiling (NRV). If replacement cost exceeds NRV, use NRV instead.
3. Compare it to the floor (NRV less normal profit margin). If replacement cost is below the floor, use the floor instead.
4. The result is your designated market value.
5. Compare that designated market value to historical cost. Report inventory at whichever is lower.

Applying Lower of Cost or Market

Valuing Inventory at the Lower Amount

If market value (as determined above) is lower than historical cost, the company writes the inventory down to that lower amount. The reduced figure becomes the inventory's new carrying amount on the balance sheet.

Once written down, the new carrying amount is treated as the "cost" going forward. Under U.S. GAAP, subsequent recoveries in market value are not recognized. You don't write inventory back up. The loss is only reversed when the inventory is eventually sold or consumed.

Recording Losses

When a write-down is required:

1. Calculate the difference between historical cost and the lower market value. That difference is the loss.
2. Record the loss in the income statement. It's typically included in cost of goods sold, though material write-downs may be reported as a separate line item.
3. Reduce the inventory balance on the balance sheet by the same amount.

For example, if inventory has a cost of $\$100{,}000$ and a designated market value of $\$85{,}000$, you'd record a $\$15{,}000$ loss and carry the inventory at $\$85{,}000$.

The loss is recognized in the period when the decline in value occurs, not when the inventory is eventually sold. This is the conservatism principle at work.

LCM for Different Inventory Types

The way you determine market value shifts depending on where inventory sits in the production cycle.

Raw Materials

For raw materials, replacement cost is usually the most relevant market indicator. If the cost to repurchase raw materials has dropped below what you originally paid, that signals a decline in value. Write the raw materials down to the lower replacement cost (subject to the ceiling and floor constraints).

Work-in-Process

Work-in-process (WIP) inventory consists of partially completed goods. Market value for WIP is typically based on the NRV of the finished product, minus the estimated costs still needed to complete production and sell the goods. If this figure falls below the carrying amount of the WIP, a write-down is necessary.

Finished Goods

For finished goods, net realizable value is the primary market measure since these items are ready for sale. Compare NRV to historical cost. If NRV is lower, write the inventory down and recognize the loss.

Exceptions to the LCM Rule

Firm Sales Contracts

If a company has a binding contract to sell inventory at a fixed price that exceeds current market value, the LCM rule generally does not require a write-down for that contracted inventory. The contract price provides assurance that the company will recover its cost, so the inventory remains at historical cost.

Hedged Inventories

When inventory is hedged with derivative instruments (such as futures contracts or options), the LCM analysis may be modified. The hedge is designed to offset price declines, so in some cases the inventory and the hedging instrument are evaluated together as a combined position rather than separately.

Financial Statement Impact

Balance Sheet Presentation

Inventory appears on the balance sheet at the lower of cost or market. Any write-down reduces total current assets and, by extension, total assets. Companies typically disclose the details of significant write-downs in the footnotes to the financial statements.

Income Statement Effects

Inventory write-downs reduce gross profit (if included in cost of goods sold) or operating income (if reported separately). A large write-down in a single period can significantly distort period-over-period comparisons of profitability, which is why disclosure of the amount and cause is important for users of the financial statements.

Tax Considerations

Inventory Valuation Methods for Taxes

Tax authorities may require or permit different valuation methods than those used for financial reporting. LIFO, for instance, is permitted for U.S. tax purposes and can lower taxable income during periods of rising prices. However, the LIFO conformity rule requires that if you use LIFO for taxes, you must also use it for financial reporting.

Differences Between Financial and Tax Reporting

When inventory valuation methods differ between financial statements and tax returns, temporary differences arise. These differences create deferred tax assets or liabilities that must be tracked and reported. Companies often maintain separate inventory records to account for these differences properly.

Advantages and Disadvantages

Conservative Valuation Approach

The LCM rule aligns with the accounting principle of prudence. It prevents overstating assets and ensures losses are recognized promptly. Financial statement users get a more realistic picture of inventory value, which supports better decision-making by creditors and investors.

Potential for Income Manipulation

The LCM rule does involve management judgment, particularly around estimates of NRV and normal profit margins. This discretion creates room for earnings management. A company could, for example, take aggressive write-downs in a bad year (a "big bath") to make future periods look better by comparison. Auditors and regulators watch for this, but it remains a known limitation of the rule.

Disclosure Requirements

Footnote Disclosures

Companies must disclose in the footnotes:

• The inventory valuation method used (FIFO, LIFO, weighted average, etc.)
• The amount and nature of any significant inventory write-downs
• Any changes in valuation methods during the period, along with the reasons for the change and the effect on financial statements

Explaining Inventory Valuation Methods

Beyond naming the method, companies should explain how they determine both cost and market value. Any significant assumptions, estimates, or judgments involved in the valuation process should be disclosed. This transparency helps financial statement users assess the reliability of the reported inventory figures and understand the company's exposure to inventory-related risks.